Requirement Summary
This measure can be claimed if the refrigerated cases, and any other fridge or refrigerator installed are energy efficient. This can be demonstrated by purchasing refrigerated cases, fridges and refrigerators that achieve recognized appliance ratings as described in the Approach/Methodologies section (below).
Intention
Minimize the energy consumed by refrigeration equipment installed in the buildings, such as supermarkets and small food retail, to reduce the operational costs and increase the reputation of the retailer.
Approach/Methodologies
EDGE uses the following recognized appliance rating systems, but is not limited to:
- Energy Star rated - Commercial Food Service (CFS) equipment, which are up to 40% more efficient than standard ones; or
- Minimum ‘A’ rating under the EU Energy Efficiency Labelling Scheme; which will be mandatory in 2016 for commercial refrigeration cabinets (draft versions are currently available); or
- Listed in the Energy Technology Product List (ETL); or
- Equivalent level in a comparable rating scheme to the ones above.
The energy chart shows reduction in ‘Refrigeration'.
Potential Technologies/Strategies
Refrigerated cases are mostly used in supermarkets and small food retail, where up to half of the energy consumption is dedicated to the refrigeration systems (display cases and storage coolers). Four main categories of refrigerated cases are shown in the table below:
Table 50: Types of refrigerated cases
The energy use of the cases described above is related to the refrigeration load, the sources of which are:
- Infiltration: Moist and warm air from the ambient pass through the open front of the cases. Energy efficiency measures (EEMs) include air curtains or glass doors, which are detailed in Table 51;
- Conduction: Case panels and walls allow heat to be conducted to the interior of the case;
- Thermal radiation from the ambient surfaces to the product and display case interior; and
- Internal heat gains: generated by the lights, evaporator fans, periodic defrosts, and anti-sweat heaters.
To reduce this load various energy efficiency measures (EEMs) could be applied to the refrigerated cases, which result in the reduction of the refrigeration load and therefore energy savings of the retail units. These EEMs are explained in the table below:
Table 51: Efficiency measures for Refrigerated cases
Technologies/Controls | Potential Saving (Refrigeration) Energy | Application | Benefits/Key Features for Efficiency |
Glass doors | Up to 50% |
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Strip Curtains & Air Curtains | 30% |
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Night blinds or Night covers | 20% |
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Multideck Air Curtain Optimization Technology | 17% |
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Defrost Optimization | 20% |
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Interior Lighting | 5-12% |
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Efficient Modular/Multi Evaporator Coil | 10% |
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High Efficiency Compressors and Fans (Evaporator or Motors) | 9% |
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Electronic Commutated Motors (ECM) | 2-8% |
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Thicker Insulation | 4-6% |
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Non-Electric Anti-sweat Heater Controls | 3-6% |
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High efficiency Liquid Suction Heat Exchanger (LSHX) | 3% |
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Tangential fan | 2% |
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Low-E / reflective glazing (K glass) | 1% |
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The way the occupants / building manager use the appliances also influences energy performance. It is important to provide users with guidelines outlining the benefits of these appliances, and the best way to achieve maximum efficiency.
Relationship to Other Measures
Claiming this measure reduces energy use for refrigeration only.
Assumptions
The base case assumes standard refrigerated cases. The improved case is 10% more efficient. The reduction varies depending on the type of building.
Compliance Guidance
Design Stage | Post-Construction Stage |
At the design stage one of the following must be used to demonstrate compliance:
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At the post-construction stage one of the following must be used to demonstrate compliance:
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