The following report — “Evaluating the Philippines’ Food Cold Chain, Energy Efficiency and Environmental Impact | Research Report – June 2020″ — is based on desk research conducted by the Cold Chain Innovation Hub for the “Global Partnership for Improving the Food Cold Chain in the Philippines” project.
The report has been divided into three parts and reproduced below.
Download the full report PDF here.
To see the report’s full list of references, sources and links click here.
Main Findings
- The Philippines has an opportunity to leap frog traditional cooling technologies and implement several alternative clean cooling technologies available in the market today.
- Implementing traditional cooling equipment today risks exacerbating greenhouse gas emissions for the next decade or more.
- The Philippines agriculture and farming sector is very vulnerable to disruption due to a lack of post-harvest cold chain infrastructure.
- Major infrastructure shortages include modern integrated pack-houses with pre-cooling equipment and cold storage facilities located near farms as well as refrigerated transport for both rural areas and urban distribution.
- Alternative clean cooling technologies exist today and are ready to be tested and demonstrated as part of a fully functioning state-of-the-art innovative farm-to-fork cold chain to support the future development of the Philippines.
Part 1: Current State of the Philippines’ Cold Chain
Post-harvest cold storage infrastructure for a large part of the Philippines’ agriculture, fishery, and livestock/poultry sectors are non-existent or inadequate today.
The cold storage infrastructure that does exist today in the country is largely owned and operated by major logistics companies.
Most of the cold chain system in the Philippines are developed and operated by major local logistics companies and retailers (superstores and convenience stores) that sell imported agri-products and foods.
The infrastructure is largely disconnected from the local production regions. Additionally, cold storage infrastructure that has been created in the last few years has been sitting unused because they were strategically deployed in areas that are already disconnected from the beginning stages of the cold chain.
The situation has been exacerbated by the COVID-19 pandemic and the insecurity of the food supply in the Philippines and its over reliance on imports and exports has been brought to the forefront.
However, deploying traditional cold chain equipment is a double-edged sword — improving food security while at the same time risking a significant increase in energy use and environmental impact.
This means that there is an urgent need to identify, test and demonstrate energy efficient and clean cold chain equipment in the Philippines.
According to a study conducted by the UK-based Birmingham Energy Institute in 2017 on establishing clean cold chains in India, alternative technologies for the entire cold chain are available and market ready today.
Luckily there is no shortage of clean cold technologies with which to build a sustainable cold chain in India…It became clear that every stage of the cold chain – from pack house pre-cooling to vehicle refrigeration to cold storage hub – could be freed from its current dependence on grid electricity or diesel.
Several examples of these alternative clean cooling technologies, as applicable to the Philippines food cold chain, have been identified in this report.
Cold Chain Components
For the purpose of this report, we’ve identified the four major food categories that require cold chain infrastructure:
- Fruits and vegetables
- Fish and seafood
- Poultry and livestock
- Milk, butter and ice cream
To set a foundation for a basic understanding of the food cold chain as a whole, we have first focused on the fruits and vegetables sector. The cold chain and its associated infrastructure components for this sector have been simplified and broken down in the following infographic:
These major components with their desirable set-up locations have also been broken down and identified in a study conducted by the Government of India in 2015. This is shown in the table below:
| infrastructure component | Desirable set-up location |
|---|---|
| Modern Pack-house (PH) | At farm gate for fresh produce preconditioning |
| Long Haul Transport (T) | From pack-house to “Mandi” (Indian term for wholesale produce market)/wholesale buyer |
| Cold Storage Hubs (CH) | Close to consumption/distribution centre |
| Cold Storage Bulk (CS) | At farm gate/food processing premises |
| Ripening Chamber (RC) | Close to consumption/distribution centre |
| Last Mile Transport (t) | Within distribution city |
| Retail/Front-end (FE) | Last mile merchandising |
| Food Processing Unit (PU) | Factory dispatch of food product as source point |
Near the Farm
Pre-Cooling
What is pre-cooling?
Pre-cooling is the first step for fruits and vegetables in the food cold chain. It is the process of removing field heat from freshly harvested produce and is typically done before it is stored in a cold room for a longer period of time before being picked up by a refrigerated truck.
To ensure energy efficiency in cold storage facilities, pre-cooling of harvested crops is necessary in order to prepare the crop for proper temperature input into the cold storage process.
The main objective of pre-cooling is, therefore, to reduce the temperature of a commodity to the optimum level as rapidly as possible after harvest without inducing physiological disorders or physical damage.
Pre-cooling is important because it maximizes and preserves the optimum level of quality for the produce and its value for sale.
It must be noted that pre-cooling of fruits, vegetables and meat products becomes critical in determining the grading outcome as it significantly prolongs shelf life of these fruits/vegetables and satisfies the cooling/quality requirements of meat processors.
Ideal temperatures vary for various types of produce:
2°C for spinach, for example, 7-10°C for peppers, green beans and tomatoes, and 13° for mangoes.
Traditional methods and technologies
There are several pre-cooling methods used for fruits and vegetables. Some work for many types of produce while others only work for certain types.
Some common methods are pictured below:
These methods are also summarized in the table below:
| Method | description | required equipment |
|---|---|---|
| Shade/night harvesting | Produce left in the shade during and immediately after harvesting (or harvested at night) deteriorates less than produce left in the sun. | None |
| Hydro cooling | Hydro coolers may either be an immersion-type or a shower system and may make use of ice blocks or a mechanical refrigeration system as a source of cooling. For either type, a water pump is used to circulate and distribute water. | Ice machine, refrigeration system, water pumps |
| Evaporative vacuum cooling | A vacuum cooler makes use of an air-tight chamber which is made of steel. Under reduced pressure heat is absorbed by the evaporating water at the surface of the produce. | Air-tight steel chamber, refrigeration system |
| Icing | Icing makes use of crushed ice packed together with the commodity in water-resistant containers. | Ice machine, water-resistant containers |
| Forced air cooling | Tunnel cooling, a common method of forced air cooling used in developed countries, involves the blowing of cool air through containers of produce. | Refrigeration system, cold room, fans |
| Cold room | This method simply involves placing stacks of produce in a refrigerated space. Slowest method of pre-cooling due to field-heat still being present in produce. | Refrigeration system, cold room |
In the Philippines
According to several studies, there is a lack or absence of pre-cooling facilities in and around farm and trading areas in the Philippines and it has contributed significantly to the quality deterioration and increased food losses along the food cold chain.
Pre-cooling and cold storage facilities are lacking both in the northern and southern farms in the Philippines…Traded vegetables are just deposited around the trading facility under direct sunlight, uneven dusty and rocky ground and left on that condition until trading transaction has been completed and truck for loading has arrived, which could last for hours.
The current lack of post-harvest facilities and cold chain practices are resulting in major post-harvest losses in the crops sub-sector.
Cabbage is estimated to have 29% food loss due to inadequate pre-cooling.
Research conducted in 2010 by the University of the Philippines Los Banos and the Philippine Center for Post-harvest Development and Mechanization showed that the current business-as-usual process involves the harvesting and transport of fruits and vegetables all the way to market with zero use of refrigeration.
At present, the distribution system is quite inefficient due to lack of functional post harvest facilities, trading centers and packing houses, storage facilities for fresh, poor infrastructure and weak implementation of policies for agriculture.
This has been exacerbated by the COVID-19 pandemic and has exposed the lack of flexibility and vulnerability of the country’s food supply due to inadequate cold chain infrastructure.
Risks of using traditional methods and technologies
Traditional refrigeration systems used for pre-cooling that involve refrigeration systems, electric fans and pumps contribute to carbon emissions in direct ways (through synthetic refrigerant leaks) and indirect ways (through reliance on grid electricity or diesel).
Conventional cooling technologies typically run using refrigerant gases (‘F-gases’) that are themselves extremely powerful greenhouse gases and tend to leak. Pound for pound, some F-gases cause thousands of times more warming than CO2. Conventional cooling technologies also typically rely on diesel or grid electricity, and so cause further large emissions of CO2 from their energy consumption. In addition, since many of the technologies are powered by lightly regulated secondary diesel engines, they also emit grossly disproportionate amounts of local air pollution.
Cold Storage (Bulk)
What is Cold Storage (Bulk)?
A cold storage (bulk) facility is strategically located near the farm. Once produce has been pre-cooled it must either be immediately loaded into a refrigerated truck for transport to market or kept in a cold storage (bulk) facility.
In a 2019 report titled “Promoting Clean and Energy Efficient Cold-Chain in India” by the Shakti Sustainable Energy Foundation, Cold Storage (Bulk) facilities were described as follows:
It is designed for long duration storage of produce to build an inventory buffer which will serve to smoothen the episodic production by stabilizing & sustaining the supply lines. These are normally constructed in areas close to producing areas (farm-gate) to facilitate quick access to producers for a selective set of crops only.
Pre-cooling and cold storage often are integrated in modern pack-house facilities. These are described in a separate section of the report (see: The Pack House).
Traditional methods and technologies
Typically, fruits and vegetables can simply be stored in a cold room near the farm while it waits to be picked up. These cold rooms are cooled by packaged refrigeration systems or even modified air-conditioners on small to medium scale farms.
Common cheap forms of cool rooms include:
| method | description | required equipment |
|---|---|---|
| Self-constructed cool room with an air conditioner and a “Coolbot” device | A traditional room window mounted type air conditioner can be connected to an insulated room made from double-walled plywood panels with polystyrene sheets for insulation. Connecting the “Coolbot” device artificially lowers the temperature of the air conditioner thereby forcing it to operate as a refrigeration unit. | Plywood, Coolbot device, room air conditioner |
| Commercial refrigerator or walk in cooler | This is a larger commercial refrigerator or walk in cooler powered by the electrical grid using either hydrocarbon or freon refrigerant. | Commercial refrigerator |
In the Philippines
In the Philippines, there is a significant lack of cold storage (bulk) facilities.
In the Philippines, there are only a few cold storage facilities available for small to medium scale farmers, hence, food loss occurs during prolonged storage. The very high temperature and relative humidity due to the tropical nature of the country is also one of the reasons for the quality deterioration of crops for small to medium scale farmers who cannot afford cold storage facilities.
Risks of using traditional methods and technologies
Similar to pre-cooling technologies, traditional equipment used for cold storage bulk facilities have significant impacts on the environment including refrigerant gas leaks, pollution from diesel engines, or the use of fossil-fuel powered grid electricity.
On the Road
Refrigerated Trucks and Vans
On land, produce is transported mainly by refrigerated vehicles (in addition to by sea via the roll on/roll off system in the Philippines).
Traditional methods and technologies
- Refrigerated trailer (diesel-powered refrigeration system)
- Refrigerated trucks/vans (vehicle engine direct drive powered refrigeration system)
- Refrigerated trucks with eutectic plates (pre-charged cooling before transport)
Refrigerated trailers’ refrigeration systems are typically powered through integrated diesel driven motors that are in addition to the truck’s main engine.
For smaller refrigerated trucks and vans, their refrigeration systems are usually powered either by direct drive systems linked to the vehicle engine or separate batteries.
Eutectic plate trucks are chilled prior to transport by a refrigeration system powered by a diesel generator or by being plugged into the electrical grid.
The three methods with the associated energy sources are summarized below:
| method | equipment needed | energy source |
|---|---|---|
| Refrigerated trailer | Transport refrigeration system | Secondary diesel generator (in addition to the vehicle’s primary diesel engine), electrical grid |
| Refrigerated truck/vans | Transport refrigeration system | Vehicle engine |
| Refrigerated trucks with eutectic plates | Stationary refrigeration system, eutectic plates or phase change materials | Secondary diesel generator (in addition to the vehicle’s primary diesel engine), electrical grid |
The majority of the refrigerated trailers, trucks and vans use R134a or R404a as refrigerants.
The usage of the trucks can be broken down into two main categories:
- Long haul: Used to transport produce from the farm to a storage or distribution center.
- Short haul: Used to transport produce from storage and distribution centers to markets or retail/food service locations.
In the Philippines
The Philippines has a severe shortfall of refrigerated vehicles to serve its urban population as compared to developed countries.
…providing the farmers with refrigerated trucks is actually a key in preventing food loss and increasing the income of farmers.
Based on data provided by several sources, compared to France which has a similar number of urban residents, the Philippines has less than 10% of the refrigerated vehicles needed to serve its urban population.
| No. of urban residents | no. of refrigerated vehicles | |
|---|---|---|
| France (2014) | 55,000,000 | 140,000 |
| Philippines (2019) | 50,000,000 | 10,000 |
Instead of refrigerated vehicles, transportation of fruits and vegetables are done by open non-refrigerated trucks, or oversized jeepneys and tricycles.
These are used mainly when transporting produce from rural areas to urban or wholesale markets as well as terminals and ports for export.
Land transportation is usually done by trucks from the packing facilities to the terminals and ports for distribution internationally.
Unrefrigerated land and sea transportation is usually combined when bringing produce from the southern regions to the northern regions where the major domestic markets are located. Transit time is usually less than two days and produce is typically exposed to high temperatures during the trip.
This process is described in detail in a 2010 study conducted by the University of the Philippines Los Banos and the Philippine Center for Post-harvest Development and Mechanization:
Commodities are usually transported by ship from the southern part where crops are produced and marketed to the northern part where the major domestic market is situated. If there are no delays due to bad weather or technical ship problems, the transit time is about 36 hours. Delay in transport would lead to additional handling cost, loss of volume and loss of potential profit (Bautista and Maunahan, 2007) When commodities in the metal van are loaded in passenger ships, the vans are placed below the boat where the engine is located. The temperature rises really high due to the engine heat and the heat of the commodities emitted in the process of respiration. Commodities are also shipped using cargo vessels which takes a shorter period of time (24 hours). However, cargo vessels are more limited than passenger ships.
After the ship has docked, it will still take about 5-6 hours for the fruit van to be released. If fruits are bulk loaded, stripping takes another 16 hours. The bananas will then be transferred in trucks or oversized jeepneys and transported over land. However, the vehicle is always fully loaded and the handlers sit on top of the produce. The people sitting on the bulk loaded fruits add weight especially to the bottom fruits which results in compression damage.
Risks of using traditional methods and technologies
There are two main components related to the environmental impact of refrigerated transport vehicles.
The first and the largest is the diesel engine used to power the transport refrigeration unit (TRU) on the truck (separate from the trucks main engine).
Vehicle refrigeration today is overwhelmingly powered by diesel, often using a highly polluting secondary engine to drive the Transport Refrigeration Unit.
According to a 2015 report titled “Cold chains and the demographic dividend” by UK-based Dearman Engine Company, the diesel engines used to power the TRUs:
- Consume up to 20% of the truck’s fuel
- Emit significant amounts of nitrogen dioxide
- Emit significant amounts of particulate matter
- Emit 50 tonnes of carbon dioxide per truck per year
In addition, the TRU:
- Leaks F-gas refrigerants at an estimated annual leakage rate of 25% (the most common F-gases used for TRUs are R134a or R404a)
Finally, the vehicle engine itself emits CO2. These emissions occur both as the truck is moving and as it sits idle during loading and off loading.
Near the City
Cold Storage (Hubs)
What are Cold Storage (Hubs)?
Cold Storage (Hubs) can also be called cold storage distribution facilities. They are located near urban areas and markets and are usually distinguished from a cold storage (bulk) facility by its short term handling, as opposed to longer duration storage.
The Government of India described cold storage (hubs) as follows:
It is designed for short-term handling of produce so as to serve as a distribution logistics platform for marketable packaged produce and ready to retail produce…These are normally constructed close to consumption centres, built at the front-end linked to source points with refrigerated transport.
In the Philippines
According to the Department of Agriculture, there are 233 accredited cold storage warehouses in the country. Total cold storage capacity is estimated to be around 2,000,000 m3 according to the Global Cold Chain Alliance and the Cold Chain Association of the Philippines. The Global Cold Chain Alliance also estimated the average facility size to be around 16,667 m3.
| Number of Facilities | 233 |
| Total Capacity | ~2,000,000 m3 |
| Average Facility Size | ~16,667 m3 |
Note on Units of Measure:
Cubic meters was chosen to be adopted as the standard capacity unit of measure in order to assess the Philippines’ cold storage sector from a global perspective. Cubic meters is the standard unit adopted by the Global Cold Chain Alliance. In the Philippines, however, it is customary to measure cold storage capacity in either number of pallet positions or metric tons.
Therefore, there is some potential for statistical error due to the need to apply quantitative conversion factors. This report uses conversion factors provided by the Global Cold Chain Alliance which are as follows:
1 metric ton = 4.3 cubic meters
The conversion from weight-based units (metric tons) to volume-based units (cubic meters) depends on the product in storage. Conversions provided by the Global Cold Chain Alliance are based on assumptions provided to them by food industry experts about types of products stored.
The majority are largely owned and operated by major logistics companies for import and export.
Most of the cold chain system in the Philippines are developed and operated by major local logistics companies and retailers (superstores and convenience stores) that sell imported agri-products and foods.
Geographical Distribution
The Philippines is divided into 17 administrative regions within its three main island groups of Luzon, Visayas and Mindanao.
Of the 233 total cold storage warehouses accredited by the Department of Agriculture, the majority (91) are located in the National Capital Region (also referred to as Metro Manila).
| Luzon | Region 1 Region 2 Region 3 Region 4A Region 4B Region 5 Cordillera Administrative Region (CAR) National Capital Region (NCR) | 158 |
| Visayas | Region 6 Region 7 Region 8 | 32 |
| Mindanao | Region 9 Region 10 Region 11 Region 12 Region 13 Autonomous Region in Muslim Mindanao | 43 |
Traditional methods and technologies
Large cold storage facilities used as distribution hubs can vary widely in format and scale. However, most facilities use centralized refrigeration systems.
A traditional ammonia refrigeration system uses over 10,000 lbs (4,356 kg) of ammonia, usually with a glycol loop, in what is called a central system. This central system uses air handling units, cooling coils, etc. located throughout the facility. The main components, such as the compressors, condensers and vessels of the system, are in a central machine room. Ammonia is then piped from the machine room to the evaporators at the load.
Smaller facilities typically employ freon-based refrigerants while larger facilities typically employ ammonia.
95% of the facilities in the Philippines operate on ammonia. The majority of the systems are single stage flooded pumped liquid recirculation systems using reciprocating or screw compressors. A few systems use glycol as a secondary refrigerant. A few NH3/CO2 systems have been installed (less than 5%).
Small facilities (under 100MT of storage capacity) sometimes use freon-based systems (i.e. 404A with scroll compressors).
Food Retail
In the Philippines
The Philippines’ food retail market in 2018 was valued at $47.4 billion.
In 2016, sales of sari-sari stores (sari-sari is the Philippine word referring to a small owner-operated neighborhood convenience store) were estimated to reach more than $26.94 billion, accounting for almost 60% of total food retail in the country (Food Retail Sectoral Report, United States Department of Agriculture, Foreign Agricultural Service, 2017).
Supermarkets posted the second biggest sales growth next to convenience stores with 7% growth in 2016. Supermarkets continue to be the most frequently visited modern retailer since they are usually located near residential areas or in shopping malls which consumers regularly visit.
Shifting consumer preferences
In the Philippines, there is an ongoing shift in consumer habits to buy fresh and frozen produce from supermarkets than from traditional wet markets.
There is a growing demand for gourmet and healthy foods, frozen ready-to-cook foods, processed grocery items and other food ingredients for home meal replacement. This is also being driven by a growing consumer awareness of food quality and safety.
The rapid modernization and expansion of the Philippine food retail industry have also led to the increase of national and upscale supermarket chains throughout the country.
Traditional methods and technologies
Typical commercial food retail refrigeration systems consist of refrigerated display cabinets or display cases that are either independent units or are connected to a centralized refrigeration system.
Food Service
In the Philippines
There are a total of 30,889 establishments engaged in Accommodation and Food Service Activities according to the 2016 Annual Survey of Philippine Business and Industry (ASPBI).
Restaurants led the sector with 7,218 establishments, accounting for 23.4 percent of the total number of establishments. This was followed by cafeterias with 4,725 establishments (15.3%) and fast-food chains with 4,411 establishments (14.3%).
The Philippines food service sector is highly dominated by independent restaurants. However, quick-service restaurants and foreign fast food chains are gaining prevalence owing to the preferences of the growing millennial customer base.
Traditional methods and technologies
Food service businesses such as fast food restaurants, cafes and bars typically use smaller commercial refrigerators where food is stored while it waits to be prepared for consumption. The majority are independent units that are not connected to a larger centralized refrigeration system.
Part 2: Clean Food Cold Chain Alternatives
Several clean cold chain technologies exist today. Some examples are listed below.
Pre-Cooling & Near-Farm Cold Storage
Portable, solar-powered cold rooms:
These insulated containers have cooling compartments and a refrigeration system driven by a solar roof. The refrigeration system simultaneously cools the produce and recharges the unit’s built-in cold storage panels made of phase-change materials.
The units can pre-cool and store produce. It can also control humidity and operation can be monitored via smartphone.
Small-scale solar-powered absorption chillers:
Solar Polar is a British company that has developed a small-scale solar-powered absorption chiller. Absorption chilling is a well established technology that turns heat directly into cooling – without any electrical stage – through the vapour absorption cycle.
Solar-powered mobile cooling demountable trucks:
The British truck body builder Cartwright Group is developing another solar powered mobile cooling concept. Known as SPICES – Solar Powered Indian Cold-chain Eutectic Solution – the device comprises a demountable truck body with a solar roof. During harvest the unit is detached from the truck and left at the field, where farmers can load their crops to be pre-cooled and then transported directly to market in the same vehicle without further handling…Temperature is maintained through the combination of solar power and eutectic cold storage, and needs no external power supply or infrastructure investment by farmers.
The truck body can be detached and left at the field where crops can be pre-cooled and then transported directly to market. It is solar-powered and uses eutectic cold storage and needs no external power supply.
Transport
Replacing F-gases with natural refrigerants:
Several refrigerated vehicles with transport refrigeration units that use natural refrigerants such as CO2 and propane are available and in use in the market today.
In addition, electric Transport Refrigeration Unit’s (TRU’s) compatible with electric vehicles are available.
Liquid carbon dioxide is also being used for TRUs rather than diesel powered refrigeration systems.
Additionally, liquid air/nitrogen is being used as both the fuel to drive the vehicle engine as well as the coolant to replace the diesel powered refrigeration system completely.
The Pack House
What is a pack house?
Harvested produce is often brought to a common facility for preparation and storage pending transport to market. In its various forms, this facility is referred to as a packing-shed, a pack-house or a packing-house.
An integrated pack house designed for multiple horticulture crops was recently built in Haryana, India. It includes variety of sorting, grading, packing and cold storage facilities. An example can be seen here.
A packing-house can be defined as a designated facility where fresh produce is pooled and prepared in order to meet the requirements of a target market (Food and Agriculture Organization of the United Nations, 2012).
Model integrated pack house
The proposed design of a model energy efficient, sustainable and modern pack house facility in Haryana, India was included in a 2019 report titled “Promoting Clean and Energy Efficient Cold-Chain in India” by the Shakti Sustainable Energy Foundation. The refrigeration system uses ammonia. The blueprint is shown below:
Cold Storage
Modern energy efficient and natural refrigerant-based alternatives to traditional large cold storage refrigeration systems include low-charge ammonia and transcritical CO2 based systems.
What is low-charge ammonia?
Modern low-charge ammonia systems are large industrial refrigeration systems where an attempt has been made to reduce the amount of ammonia used in the system while retaining its energy efficiency.
In recent years, three types of low-charge ammonia systems have emerged as systems being used for cold storage and other industrial and commercial refrigeration systems.
| Low-charge Ammonia: Optimized System | An optimized low-charge ammonia refrigeration system works by using the traditional industrial ammonia refrigeration technology and further optimizing it with low-charge components, such as specifically designed evaporators, controls, heat exchangers, compressors and condensers. A properly designed low-charge optimized system, uses less than 6,053 lbs (2,746 kg) of ammonia and requires therefore fewer vessels, fewer pipes, smaller pipe diameters and no pumps. |
| Low-charge Ammonia: Packaged System | A packaged ammonia system eliminates the huge quantities of ammonia inventory, and piping, by moving to smaller self-contained systems that are usually placed on the roof/ground outside preventing any danger from leaks. These self-contained systems have about 4.3 lbs/TR (0.55 kg/kW) ammonia charge and usually combine the compressor, evaporator valve system and control systems into one easily installed and movable packaged system. |
| Low-charge Ammonia: NH3/CO2 System | An ammonia/CO2 system can come in various formats (such as cascade, CO2/NH3 with pumped volatile brine and ammonia DX system using liquid CO2 overfeed) but the main idea is to isolate the ammonia charge, which is usually between 4 and 6 lbs/TR (0.5 – 0.83 kg/kW), to the machine room and use the CO2 as the secondary coolant that can be pumped into cold rooms in the facility. |
Transcritical CO2
In addition to low-charge ammonia systems, systems that employ the use of CO2 only have also emerged as energy efficient and sustainable solutions for cold storage facilities.
Hannaford, a Scarborough, Maine-based division of Ahold Delhaize, is one of the first U.S. grocers to employ a transcritical CO2 system in a refrigerated warehouse. Hannaford’s CO2 warehouse also contains one of the world’s largest refrigerated spaces (250,000 ft2; 23,226 m2) to use a transcritical system. The warehouse supplies 85 of Hannaford’s approximately 190 stores in New York, New Hampshire, Vermont and Massachusetts.
Four transcritical racks are planned in what is a replacement of the warehouse’s original, almost 30-year-old R22 system. Three of the racks are medium-temperature, two-stage, intercooled systems, while the low-temperature rack (the first installed) is single stage, with ejector defrost. The installation was completed in February 2020.
Food Retail and Food Service
In commercial food retail and food service, transcritical CO2-based refrigeration systems as well as hydrocarbon-based refrigeration systems have emerged as sustainable and energy efficient solutions. Moreover, several hydrocarbon-based refrigeration systems have already been installed in the Philippines in the past few years.
In August, Royal Duty Free – a Philippines-based chain of duty-free supermarkets – will retrofit one of its stores to use only R290 plug-in units combined with a water-loop system, according to a local refrigeration contractor, Cold Front Technologies Asia, Inc. The store is located in Subic Bay — a special economic zone a few hours’ drive northwest of the Philippines’ capital city of Manila. It will be “the first store in the country to use 100% R290-based refrigeration,” according to Emilio Gonzalez La’O, Cold Front’s president.
Technology Assessment Methodology
In order to contribute to the development of a clean and energy efficient food cold chain in the Philippines, the following best-practice assessment, measurement and analysis methodologies have been identified.
The listing of different methodologies must be further investigated and adapted to the requirements and limitations of the Philippine cold chain industry.
The following is a technology assessment methodology taken from the 2019 report titled “Promoting Clean and Energy Efficient Cold-Chain in India” produced by the Shakti Sustainable Energy Foundation.
It outlines the 8 major factors considered when selecting the most appropriate piece of technology to use in any given clean and energy efficient cold chain application.
| Cost | Landed Cost (Percentage greater than Ammonia based VCC) Operation & Maintenance Cost (% cost of refrigerant system) |
| Specific Energy Consumption | Specific Energy Consumption (kWh/TR) GHG emissions related to operation (kg CO2) |
| Scale-Up Opportunity | Whether intensive training is required for operation and maintenance services Qualification of personnel to operate and maintain Scale-up opportunity (% of capacity) Development status of the technology Technology in existence for (years) |
| Local Capacity to Build | Energy requirement (units/day) Water requirement (litres/year) Water quality (source) Number of employees in the company Number of technology providers within district |
| Efficiency Gains | Efficiency gains (%) |
| Operation and Maintenance | Availability of after-sales services (in km radius from site) Availability of spare parts (% years of life of technology) |
| Compatibility with Closed Loop System | Compatible with renewable or waste heat recovery technologies |
| Global Warming Potential/Ozone Depleting Potential (GWP/ODP) | GWP related to refrigerant ODP related to refrigerant |
Part 3: Measuring Energy Efficiency and Environmental Impact
The following are different energy efficiency and environmental impact monitoring and analysis methodologies sourced from research papers and case studies considered to be best practice globally.
The facilities to be analyzed are as follows:
- Packhouse (TBC)
- Transport refrigeration unit (TBC)
- Cold storage warehouse
- Supermarket
- Convenience store (TBC)
- Restaurant (TBC)
- The cold chain as a whole (TBC)
Cold Storage Warehouses
Several studies have shown that within cold storage facilities, typically 60–70% of the electrical energy may be used for refrigeration.
In the United States, one study conducted by an energy efficiency organization in 2016 found typical energy use for cold storage facilities to be broken down as in the table below.
| Refrigeration | 54% |
| Electric Defrost | 21% |
| Lighting | 10% |
| Office HVAC | 9% |
| Battery Chargers | 3% |
| Office Equipment | 2% |
| Exhaust Fans | 1% |
Cold storage facilities can generally be categorized into three main categories:
| Chilled | -1°C to -10°C |
| Frozen | Below -18°C |
| Mixed use | Those with both chilled and frozen rooms operating from a common refrigeration system. |
Specific Energy Consumption
Specific Energy Consumption (commonly referred to as SEC) is currently the most widely used metric in the cold storage industry to benchmark and compare the energy performance of a given cold storage facility relative to other cold storage facilities in the industry.
It is defined as the amount of total electricity consumed (kWh) per cubic meter of facility size (m3) per year (or per annum commonly notated as “a”).
SEC = kWh/m3/a
SEC best practice
In a study conducted by Andy Pearson of UK-based Star Refrigeration, presented at The 25th IIR International Congress of Refrigeration in August of 2019, a best practice curve for modern cold storage facilities based on the SEC metric was proposed.
The curve is based on actual electrical usage for 21 cold storage sites in the UK where all were “managed under a common maintenance regime with a strong focus on energy performance and continuous improvement.”
For reference, the following SEC figures can be obtained from this standard.
| BEST PRACTICE SEC FIGURES FOR TYPICAL COLD STORAGE FACILITIES | |
|---|---|
| 50,000 m3 | 16 kWh/m3/year |
| 500,000 m3 | < 5kWh/m3/year |
SEC limitations
While SEC is widely considered to be the best baseline metric to use to compare the energy efficiency of cold storage facilities currently, there are a number of significant factors that are not taken into account.
- Building utilization
- Weather
- Building fabric condition
- Building and process management
- Refrigeration plant condition
- Other compensating factors
In addition, alternative methods of measuring not only the energy efficiency of a facility, but the efficiency of the facility as a whole are also available. These methods are all based on the general principle of efficiency being equal to benefit being divided by cost. Some of these include
General facility usage: Operating output divided by required input
Equipment specific: Cooling capacity divided by electrical input
Building as a whole: Product throughput divided by cost of operation
SEC significant past studies
Current best practice is built upon significant studies employing the SEC metric conducted over the past twenty five years. The following is a list of these studies in chronological order.
| ORIGINAL PUBLISHING DATE | NAME OF STUDY | REGION FOCUS | NOTES |
|---|---|---|---|
| 1994 | ETSU, 1994. Energy Consumption Guide 37: Cold Storage Sector. Energy Efficiency Office, Department of the Environment, Harwell, United Kingdom | UK | – |
| 1995 | Bosma, J. 1995. Inventory study of the energy conservation potential in cold storage installations in the Netherlands. Proc. 19th International Congress of Refrigeration, The Hague vol II, IIF/IIR | Netherlands | – |
| 2002 | Duiven, J. E and Binard, P. 2002. Refrigerated storage: new developments. IIR Bulletin – 2002-2. | EU | – |
| 2013 | Evans, J.A. Huet, J-M. Reinholdt, L. Fikiin, K. Zilio, C. Houska, M. Landfeld, A. Bond, C. Scheurs, M. and van Sambeeck, T.W.M., 2013. Cold Store Energy Performance, Proceedings of the 2nd IIR Conference on the Cold Chain and Sustainability, Paris, IIF/IIR | EU | Also known as the ICE-E study. This study was extended and updated by Evans et al in 2015, with 44% more data. See below. |
| 2015 | Evans, J.A. Foster, A. Huet, J-M. Reinholdt, L. Fikiin, K. Zilio, C. Houska, M. Landfeld, A. Bond, C. Scheurs, M. and van Sambeeck, T.W.M., 2015. Specific Energy Consumption Values for Various Refrigerated Food Cold Stores, Proceedings of the 24th IIR Congress, Yokohama, IIF/IIR | EU | – |
Example SEC Case Study: Comparing energy efficiency of a plant retrofit in Australia
In a technical paper from Australia-based industrial refrigeration system installer Scantec Refrigeration Technologies, the energy efficiency of two different refrigeration systems, retrofitted at a single cold storage facility in Mackay, North Queensland, Australia were analyzed using the SEC method.
The original system as an HFC-based refrigeration system which was decommissioned in 2015. The owners of the facility discussed replacing the old HFC-based system with a “new, more energy efficient central refrigeration system”, the paper states. The installation of the new system was completed in August 2018.
Old System
The refrigerant used in the low temperature segment was R404A. The refrigerant used in the medium temperature segment was unknown but believed to be R22.
New System
The new system was a direct expansion (DX) ammonia (NH3) based system. There was a low NH3 inventory in the refrigeration plant. It included a dry expansion refrigerant feed for the low temperature freezer evaporators and a propylene glycol loop for the medium temperature services.
Energy data collection limitations
Certain limitations in the collection of energy data were noted in the paper. Energy consumption records for the old HFC system were provided by the energy retailer, Ergon Energy. The energy consumption records for that plant included auxiliary consumers such as general light and power, office air conditioning and forklift charging.
For the NH3 system, the energy consumption was recorded via the supervisory control and data acquisition (SCADA) system. It therefore represented the energy consumption of the refrigeration plant only.
Results
The following SECs were calculated for the two systems.
| Date covered | sec | energy consumption | |
|---|---|---|---|
| HFC System | December 2009 to January 2015 | 206 kWh/m3/year | 2,020 kWh/day |
| DX NH3 System | October 2018 to January 2019 | 88 kWh/m3/year | 1,260 kWh/day |
Therefore, there was a recorded SEC reduction of around 57% by replacing the industry standard HFC based systems with a central, low charge NH3 plant in this study. A number of other factors were considered in the study such as the economics of the system’s cost to the end user, as well as considerations for ambient temperatures, building fabric, subfloor heating, etc.
For the full case study, refer to “Real energy efficiency of DX NH3 versus HFC”, presented by Stefan S. Jensen of Scantec Refrigeration Technologies at the 25th IIR International Congress of Refrigeration, in Montreal, Quebec, Canada in August of 2019.
Supermarkets
The term “supermarkets” is often used as a generic term referring to the category of commercial retail businesses where food is the majority of the product mix.
These stores are generally accepted to fall into four major categories characterized mainly by the size of the sales area in square meters (m2).
| Hypermarkets | 5,000 m2 to over 10,000 m2 |
| Superstores | 1,400 m2 to 5,000 m2 |
| Supermarkets (mid-range stores) | 280 m2 to 1,400 m2 |
| Convenience stores | less than 280 m2 |
It is generally acknowledged that refrigeration accounts for 30-60% of a supermarket’s energy bill, resulting in the highest energy consumption related to other systems (See: Minetto S., Marinetti S., Saglia P., Masson N., Rossetti A., International Journal of Refrigeration, 2017).
Several industry studies and surveys from Europe and the United States generally correspond to the following typical breakdown of energy use of a supermarket shown below (See: DTE Energy, 2015 and Benchmarking Analysis of Energy Consumption in Supermarkets, 2016).
Electricity
Refrigeration: 60%
Lighting: 18%
HVAC: 15%
Other: 7%
Natural Gas
Heating: 56%
Water heating: 22%
Bakery: 22%
Electrical Energy Intensity
As expected, energy consumption of supermarkets can very widely depending on a number of factors including business practices, store format, product mix, shopping activity, ambient temperatures, indoor temperatures and humidity conditions, the equipment used for in-store food preparation, preservation and display, etc.
Studies have also shown that a large amount of variability exists in the energy use of these stores even within the same store category and the same retail food chain.
The most widely used performance indicator for energy use in the supermarket sector is “electrical energy intensity”. This metric is defined as the amount of electrical energy consumed per year per square meter of sales area (kWh/m2/year).
A number of studies have been conducted in Europe and the US benchmarking energy use for various supermarkets in the regions. One study conducted in the UK in 2011 concluded: “The electrical energy consumption can vary widely from around 700 kWh/m2 sales area per year in hypermarkets to over 2000 kWh/m2 sales area per year in convenience stores.”
The following is a summary of key energy use benchmarks found from that study (energy consumption data sourced from a sample of 2,570 retail food stores from a number of major retail food chains in the UK in 2010):
| store type | sample size | sales area (m2) | AVERAGE ELECTRICAL ENERGY INTENSITY |
|---|---|---|---|
| Convenience stores | 640 | 80-280 m2 | 1,480 kWh/m2/year |
| Medium sized stores | 1,360 | 280-1,400 m2 | 1,500-850 kWh/m2/year |
| Large sized stores | 150 | 5,000-10,000 m2 | 600-220 kWh/m2/year |
In another study conducted in 2013 on yearly energy consumption collected from 150 supermarkets in the Netherlands (all from the same supermarket chain), the resulting regression coefficient of yearly electrical energy consumption on sales area was 407.45 kWh/m2/year.
In another report conducted by the Kigali Cooling Efficiency Programme (K-CEP) in 2018, assembled by shecco, analyzing energy efficiency guidelines for HFC-free commercial refrigeration, the following average annual electrical energy intensity figures for supermarkets were observed.
| country | AVERAGE SUPERMARKET ELECTRICAL ENERGY INTENSITY | source |
|---|---|---|
| Sweden | 400 kWh/m2/year | Energimydegheten, 2010 |
| Norway | 460 kWh/m2/year | NVE, 2014 |
| USA | 600 kWh/m2/year | Energy Star, 2014 |
| UK | 1,000 kWh/m2/year | Tassou et al., 2011 |
| Spain | 327 kWh/m2/year | CIRCE, 2015 |
Greenhouse Gas Emissions
In 1998, the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD) launched its Greenhouse Gas (GHG) Protocol initiative resulting in what is now internationally recognized as one of the main standards for corporate carbon reporting.
To date, a number of the world’s largest companies in the food retail sector have adopted this protocol as a standard for calculating and reporting their yearly carbon footprints.
Broadly, under the protocol, emissions fall into one of three categories or “scopes”.
| Scope 1 | Direct emissions from owned or controlled sources |
| Scope 2 | Indirect emissions from the generation of purchased energy |
| Scope 3 | All indirect emissions (not included in scope 2) that occur in the value chain of the reporting company, including both upstream and downstream emissions. |
Philippine GHG Inventory and Reporting Protocol
The Philippines Climate Change Commission, which reports to the Office of the President, published its “Philippine GHG Inventory and Reporting Protocol: Manual for Business” in 2017.
The report states that in order “to prevent the double counting of emissions and compliance with international standards, this reporting protocol harmonizes the best features of available standards worldwide.”
It is largely based on “The Greenhouse Gas Protocol, A Corporate Accounting and Reporting Standard” document referenced above. As an example, several of the Philippines largest conglomerates have adopted the reporting protocol into their sustainability reports. Two examples are listed below.
Ayala Corporation
Ayala Corporation is the oldest and one of the largest conglomerates in the Philippines with core interests in real estate, banking, telecommunications, and power.
| Scope 1 Direct Energy Emissions | Thermal Power Generation Generation Set Company-owned Vehicles | 1.6 million t-CO2e |
| Scope 2 Indirect Energy Emissions | Electricity Function of Facilities | 0.43 million t-CO2e |
| Scope 3 Other Indirect Emissions | Outsourced Vehicles Electricity Consumption of Tenants Desludging of Septic Tanks Armored Cars | 2.6 million t-CO2e |
SM Investments Corporation
SM Investments Corporation (SMIC) is a Philippine conglomerate with interests in shopping mall development and management, retail, real estate development, banking, and tourism. SM Markets, a chain of food retail stores consisting of SM Supermarket, SM Hypermarket and Savemore are a subsidiary under SMIC.
In SM Investments Corporation’s 2017 Sustainability Report, the company indicates that it calculates its GHG emissions “using the equity share approach according to The Greenhouse Gas Protocol”. An excerpt of figures provided is shown below:
| Scope 1 Direct GHG Emissions | 6,922 t-CO2e |
| Scope 2 Indirect GHG Emissions | 481,081 t-CO2e |
| Scope 3 Other Indirect GHG Emissions | 3.1 million t-CO2e |
International GHG Emissions Benchmarks
Several examples of leading multinational food retailers which have adopted the Greenhouse Gas Protocol are listed below:
Metro AG
Metro AG is a large German Multinational Food Retailer. It uses the Greenhouse Gas Protocol to measure key performance indicators for its facilities in terms of energy use and carbon emissions. Below is an excerpt from its 2017/18 Corporate Responsibility Report.
| IN T CO2 (CO2 EQUIVALENTS) | REFERENCE YEAR 2011 | 2015/16 | 2016/17 | 2017/18 |
|---|---|---|---|---|
| Scope 1 – direct greenhouse gas emissions | 836,828 | 712,692 | 705,377 | 621,139 |
| Scope 2 – indirect greenhouse gas emissions | 1,487,420 | 1,145,953 | 1,108,950 | 1,106,026 |
| Scope 3 – other indirect greenhouse gas emissions | 4,234,512 | 3,294,700 | 3,157,223 | 3,614,024 |
| Total greenhouse gas emissions | 6,558,760 | 5,153,345 | 4,971,551 | 5,341,189 |
Definitions: Level of all main emissions by Scope in line with the methodology of the Greenhouse Gas Protocol.
The following sources of emissions are included:
- Scope 1 = fuel oil, natural gas, liquefied natural gas (LNG), liquefied petroleum gas (LPG), refrigerant losses from commercial cooling, refrigerant losses from air-conditioning, fuel consumption of company cars and the group’s own logistics fleet, emergency power generators
- Scope 2 = electricity consumption, district heating and cooling
- Scope 3 = external logistics for the transport of goods to our stores and warehouses, in-house paper consumption for advertising and office purposes, business trips, goods and services purchased for own use, capital assets, upstream chain emissions and grid losses for all direct and indirect energy sources, waste, employee commutes, leased assets
Costco
US-based wholesaler Costco tracks its carbon emissions according to the Intergovernmental Panel on Climate Change (IPCC) and Reporting Standard.
The company’s goal is to “to work toward maintaining our carbon footprint growth to less than our company sales growth.” This goal was achieved in its 2018 reporting period as summarized by the company below:
| Sales (in thousands) | tCO2e (tons of carbon dioxide emitted) | tCO2e % Increase (over prior year) | Sales % Increase (over prior year) | |
| Total in Covered Regions in 2016 | $109,207,104 | 2,250,906 | 13.4% | 2.1% |
| Total in Covered Regions in 2017 | $131,652,651 | 2,358,629 | 4.5% | 12.31% |
| Total in Covered Regions in 2018 | $145,885,315 | 2,508,419 | 6.5% | 10.8% |
This includes Scope 1 and Scope 2 as defined by the company below:
Definitions
- Scope 1: Direct Emissions include all natural gas and propane provided to owned or controlled facilities used for heating or food processing and manufacturing. Included in direct emissions are diesel used by Costco’s truck fleets, refrigerated trailers and yard haulers; propane to power mobile floor scrubbers; jet fuel for corporate jets and fugitive emissions from leakage of HFC refrigerants from refrigeration and air conditioning equipment.
- Scope 2: Indirect Emissions are for purchased electricity and are the largest component of GHG emissions.
Family Mart
Japanese convenience store operator Family Mart measures its carbon emissions according to Japan’s Ministry of Environment guidelines, which are also based on the Greenhouse Gas Protocol.
The following is a summary of the company’s 2017 emissions according to its website.
Definitions
- Scope 1: Direct emissions of greenhouse gases, such as through the use of fuel in the business’ own operations (e.g.: gasoline used by company-owned vehicles)
- Scope 2: Indirect emissions of greenhouse gases, such as through the use of electricity provided by other companies (e.g.: electricity used at the head office, offices, and stores)
- Scope 3: Indirect emissions of greenhouse gases as a result of business activities that do not fall under Scopes 1 or 2
| Scope | category | CO2 EMISSIONS QUANTITY (T-CO2) | PERCENT |
|---|---|---|---|
| Scope 1 | 48,685 | 0.65% | |
| Scope 2 | 1,398,604 | 18.63% | |
| Scope 3 | 6,055,757 | 80.72% | |
| Category 1 Procured products and services | 5,483,494 | ||
| Category 2 Capital goods | 250,511 | ||
| Category 3 Fuel and energy related activities not included in Scopes 1 and 2 | 97,793 | ||
| Category 4 Shipping and delivery (upstream) | 118,720 | ||
| Category 5 Waste from operations | 60,899 | ||
| Category 6 Business trips | 2,090 | ||
| Category 7 Employee commutes | 784 | ||
| Category 11 Use of sold products | 330 | ||
| Category 12 Disposal of sold products | 41,136 | ||
| Total | 7,502,046 | 100% |
In addition, Family Mart also employs third party verification of its results. Verification is conducted by the Japan Audit and Certification Organization for Environment and Quality (JACO). Below are screenshot examples of its independent verification reports for its 2017 emissions.
Download the full “Evaluating the Philippines’ Food Cold Chain, Energy Efficiency and Environmental Impact | Research Report – June 2020″ here.
Full list of references, sources and links
Part 1: Current State of the Philippines’ Cold Chain
- Cold Food Chain Report Summary, Richard Li, 2018
- India’s Third Agricultural Revolution, Doubling farmers’ incomes through clean cold chains, University of Birmingham, Birmingham Energy Institute, 2017
- All India Cold-chain Infrastructure Capacity, Assessment of Status & Gap, National Centre for Cold-chain Development, 2015
- Good practice in the design, management and operation of a fresh produce packing-house, Food and Agriculture Organization of the United Nations, Regional Office for Asia and the Pacific, Bangkok, 2012
- Cooling Methods, World Vegetable Center, Youtube, 2017
- Technology Reducing Post harvest Losses and Maintaining Quality of Fruits and Vegetables (Philippines), Perlita Aquino-Nuevo, Arnel Ramir Apaga, 2010
- Promoting Clean and Energy Efficient Cold-Chain in India, MP Ensystems, University of Birmingham, Shakti Sustainable Energy Foundation, 2019
- CRITICAL INFRASTRUCTURE: Walk-in Coolers, Urban Farmer Curtis Stone, Youtube, 2016
- AdvancedRefrigeration – Transport Refrigeration Part 1, Porter and Chester Institute, Youtube, 2018
- ’AGREA’ launches ‘Move Food’ initiative to help farmers amid Covid-19 lockdown | ANC, Cherrie Atilano, President & CEO, Agrea, Youtube, 2020
- 2018 GCCA Global Cold Storage Capacity Report, Global Cold Chain Alliance, July 2018
- Cold chains and the demographic dividend, Dearman Engine Company, April 2015
- World Bank Statistics, Urban Population Philippines, 2020
- Born to be Wild: The vegetable trading posts in La Trinidad, Benguet, GMA Public Affairs, Youtube, 2018
- Emissions of Transport Refrigeration Units with CARB Diesel, Gas-to-Liquid Diesel, and Emissions Control Devices, National Renewable Energy Laboratory, U.S. Department of Energy, 2010
- World Guide to Low-Charge Ammonia, shecco, 2019
- Food Retail Sectoral Report, United States Department of Agriculture, Foreign Agricultural Service, 2017
- Cold Chain Technology Brief, Commercial, Professional and Domestic Refrigeration, IIF/IIR, UN Environment, 2018
- Annual Survey of Philippine Business and Industry, Philippine Statistics Authority, 2016
Part 2: Clean Food Cold Chain Alternatives
- Ecofrost: Made In India Solar-Powered Cold Storage To Reduce Crop Spoilage, Ecofrost website
- Transfrig tests R290 transport refrigeration system, Cold Link Africa, March 24, 2020
- Carrier Transicold – Natural Refrigerant Trailer unit with Biocoop, Carrier, Youtube, 2018
- Thermo King E-200 Product Brochure
- Foodstuffs and EECA partner up to build NZ’s first 100% electric refrigerated logistics truck, Foodstuffs NZ, June 26, 2020
- Thermo King website
- Integrated Pack House For Multiple Horticulture Crops, PVPC Group Youtube, 2020
- Hannaford Pioneers Transcritical CO2 – Again, Michael Garry, R744.com, January 15, 2020
- Royal Duty Free is First in Philippines With All-R290 Store, Devin Yoshimoto, Accelerate24.news, July 11, 2019
Part 3: Measuring Energy Efficiency and Environmental Impact
- Cold Storage Facilities Energy Savings Guide, Energy Trust of Oregon, 2016
- Specific energy consumption values for various refrigerated food cold stores, J.A. Evans, et al., 2013
- “Real energy efficiency of DX NH3 versus HFC”, Scantec Refrigeration Technologies, The 25th IIR International Congress of Refrigeration, Montreal, Quebec, Canada, Stefan S. Jensen, 2019
- Energy Consumption And Conservation In Food Retailing, S.A. Tassou, Y. Ge, A. Hadawey, D. Marriott, 2010
- Non-technological barriers to the diffusion of energy-efficient HVAC&R solutions in the food retail sector, Minetto S., Marinetti S., Saglia P., Masson N., Rossetti A., International Journal of Refrigeration, 2017
- DTE Energy’s Energy Efficiency Program for Business, 2015 Energy Profile
- Benchmarking Analysis of Energy Consumption in Supermarkets, Lelde Timma, Roberts Skudritis, Dagnija Blumberga, Institute of Energy Systems and Environment, Riga Technical University, October 2016
- Performance indicators for energy efficient supermarket buildings, Sietze M. van der Sluisa, Ulla lindbergb, Anna-Lena Laaneb, Jaime Ariasc, 12th IEA Heat Pump Conference 2017, Rotterdam, Netherlands, 2017
- Technical report on energy efficiency in HFC-free supermarket refrigeration, Klára Skačanová, Anti Gkizelis, shecco, Kigali Cooling Efficiency Programme, 2018
- The Greenhouse Gas Protocol, A Corporate Accounting and Reporting Standard, World Resources Institute, World Business Council for Sustainable Development, Revised Edition March 2004
- Basic Guidelines on Accounting for Greenhouse Gas Emissions Throughout the Supply Chain Ver. 1.0, Ministry of the Environment and Ministry of Economy, Trade and Industry, Government of Japan, 2012
Communications Lead
Cold Chain Innovation Hub