Air-cooled condensing units covers products that are specifically designed to provide cooling to other equipment and systems that incorporate evaporators (and associated expansion valve control systems). Air-cooled condensing units are factory-assembled units that consist of an air-cooled condenser, one or more compressors, and interconnecing pipe work. They may include liquid receivers, filter driers, oil separators, shut off valves and related controls, and a weatherproof housing.
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An air-cooled condensing unit is a factory-assembled, packaged unit that consists of a refrigeration compressor, an air-cooled condenser and various ancillary components. This packaged unit does not contain a complete refrigeration system, but is designed to provide a convenient method for cooling a cold room or other equipment fitted with an evaporator that is controlled by an expansion valve.
Air-cooled condensing units are used in a variety of commercial and industrial cooling applications, including cold rooms, refrigerated display cabinets, back-bar equipment, temperature controlled food preparation areas, and for air conditioning systems.
Air-cooled condensing units are available in a range of different designs and efficiencies. The Energy Technology List (ETL) Scheme aims to encourage the purchase of the higher efficiency products.
The ETL Scheme covers products in three temperature categories:
These categories are defined in terms of the product performance at a particular temperature rating point. Products may be submitted under more than one category.
To be eligible for inclusion on the ETL, products shall meet the requirements as set out below.
To be eligible, products shall:
a) Air-cooled refrigerant condenser.
b) One or more electrically driven refrigeration compressors.
c) A control system that controls the product&#;s compressor(s) and cooling fan(s).
Products shall have a coefficient of performance (COP) or Seasonal Energy Performance Ratio (SEPR) that is greater than or equal to the values shown in Table 1.1, according to the rated cooling capacity of the product.
Table 1.1 Performance thresholds for air-cooled condensing units
Evaporating temperature (Dew point) Rated cooling capacity, PA (kW) Performance parameter Threshold Operating temperature HT +5°C n/a COP &#; 3.4 MT -10°C 0 < PA &#; 5 COP &#; 2.0 5 < PA &#; 20 SEPR &#; 3.30 20 < PA &#; 50 SEPR &#; 3.30 PA > 50 COP &#; 2.0 LT -35°C 0 < PA &#; 2 COP &#; 1.1 2 < PA &#; 8 SEPR &#; 1.70 8 < PA &#; 20 SEPR &#; 1.80 PA > 20 COP &#; 1.1'&#;' means 'greater than or equal to'
'&#;' means 'greater than or equal to'
The COP, where applicable, should be measured at the specified standard rating points shown in Table 1.2.
Table 1.2 Testing conditions for COP of air-cooled condensing units at the standard rating points
Temperature category Evaporating temperature (Dew point) Ambient (Condenser air-on) temperature Compressor suction gas temperature High temperature units +5°C 32°C 20°C Medium temperature units -10°C 32°C 20°C Low temperature units -35°C 32°C 20°C
Where:
The following standards, where applicable, shall be used for measuring and calculating product performance:
Please note that performance data obtained in accordance with the test procedures set out in BS EN -2: will be accepted as an alternative to testing in accordance with BS EN -2: until further notice.
For product categories where a COP threshold is specified, performance data obtained in accordance with BS EN : will be accepted as an alternative to BS EN : until further notice.
Product performance can either be determined using Method A or Method B to determine COP, or Method C to determine SEPR, subject to the following reporting requirements:
Under method A:
a) Actual product performance should be determined at two test conditions close to the relevant standard rating point specified in Table 1.2 that comply with the following limits:
i. Evaporation temperature shall be within ±1°C of the standard rating point.
ii. Ambient temperature shall be within ±5°C of the standard rating point, and one point shall be above the standard rating condition, and one below it.
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iii. Suction Temperature shall be within ±1°C of the standard rating point.
The following measurements shall be made at each test condition with the level of measurement uncertainty specified in Table 3 of BS EN -2: , whilst the product operating under stable conditions at full load:
i. Condensing and evaporating pressures and dew point temperatures at the compressor inlet and outlet.
ii. Superheat and sub-cooling at the compressor&#;s inlet and the product&#;s outlet.
iii. Condenser air inlet temperature.
b) The condenser&#;s UA value is determined at each test condition using the verified compressor performance data to establish the heat rejection rate.
c) The arithmetic mean of the UA values at the two test conditions is used to determine the condensing temperature, and the product&#;s performance at the standard rating point.
a) Details of the calculation used to determine product performance.
b) The following information on the product&#;s compressor:
i. Refrigerating capacity and COP at the appropriate standard rating point specified in BS EN : , and at the relevant standard rating point specified in the eligibility criteria for &#;refrigeration compressors&#;.
ii. Evidence that the product&#;s compressor is listed on the Energy Technology Product List, or that its performance has been independently verified
iii. A copy of the manufacturer&#;s published performance data (or a print out of its key performance data from the manufacturer&#;s design/selection software).
Under method B, product performance shall be demonstrated by testing the product in accordance with BS EN -2: &#;Compressor and condensing units for refrigeration. Performance testing and test methods. Part 2: Condensing units&#;.
Under method C, product performance shall be demonstrated by testing the product in accordance with the procedures in BS EN -2: &#;Compressor and condensing units for refrigeration. Performance testing and test methods. Part 2: Condensing units&#;. The test conditions to be used, and the SEPR calculation method, should be those described in BS EN : &#;Condensing units for refrigeration &#; Rating conditions, tolerances and presentation of manufacturer&#;s performance data&#;.
For the avoidance of doubt COP test data should be presented to 1 decimal place. SEPR test data should be provided to 2 decimal places. As an example, a product in the high temperature category with a COP of 3.3 would be deemed to not meet the performance requirements.
Any of the following testing routes may be used to demonstrate the conformity of products against the requirements:
Further information regarding the first three routes can be found in the ETL Testing Framework.
Where applications are being made for a range of two or more products that are variants of the same basic design, test data may be submitted for a representative selection of models, provided that all variants:
The representative models shall be selected by dividing the range of products into groups of models with similar design characteristics, and testing a model in each group. The performance of each model in the group shall be predicted using a validated mathematical model. As a minimum, at least one model shall be tested in each range of products.
It should be noted that:
Products listed on the ETL may be subject to the scheme&#;s conformity testing programme in order to ensure listed models continue to meet the ETL requirements.
This specification is scheduled for review during the /22 ETL review cycle.
As the use of new low Global Warming Potential (GWP) refrigerants becomes more widespread in the air cooled condensing units market, eligibility and performance requirements may be reviewed, to account for the range of new lower GWP refrigerants that will become more widespread due to the EU F-gas regulations. The performance parameters may also be reviewed; products could potentially be assessed on their overall environmental impact accounting for seasonal efficiency, refrigerant GWP and refrigerant leakage.
Air-cooled condensing units covers products that are specifically designed to provide cooling to other equipment and systems that incorporate evaporators (and associated expansion valve control systems). Air-cooled condensing units are factory-assembled units that consist of an air-cooled condenser, one or more compressors, and interconnecing pipe work. They may include liquid receivers, filter driers, oil separators, shut off valves and related controls, and a weatherproof housing.
An air-cooled condensing unit is a factory-assembled, packaged unit that consists of a refrigeration compressor, an air-cooled condenser and various ancillary components. This packaged unit does not contain a complete refrigeration system, but is designed to provide a convenient method for cooling a cold room or other equipment fitted with an evaporator that is controlled by an expansion valve.
Air-cooled condensing units are used in a variety of commercial and industrial cooling applications, including cold rooms, refrigerated display cabinets, back-bar equipment, temperature controlled food preparation areas, and for air conditioning systems.
Air-cooled condensing units are available in a range of different designs and efficiencies. The Energy Technology List (ETL) Scheme aims to encourage the purchase of the higher efficiency products.
The ETL Scheme covers products in three temperature categories:
These categories are defined in terms of the product performance at a particular temperature rating point. Products may be submitted under more than one category.
To be eligible for inclusion on the ETL, products shall meet the requirements as set out below.
To be eligible, products shall:
a) Air-cooled refrigerant condenser.
b) One or more electrically driven refrigeration compressors.
c) A control system that controls the product&#;s compressor(s) and cooling fan(s).
Products shall have a coefficient of performance (COP) or Seasonal Energy Performance Ratio (SEPR) that is greater than or equal to the values shown in Table 1.1, according to the rated cooling capacity of the product.
Table 1.1 Performance thresholds for air-cooled condensing units
Evaporating temperature (Dew point) Rated cooling capacity, PA (kW) Performance parameter Threshold Operating temperature HT +5°C n/a COP &#; 3.4 MT -10°C 0 < PA &#; 5 COP &#; 2.0 5 < PA &#; 20 SEPR &#; 3.30 20 < PA &#; 50 SEPR &#; 3.30 PA > 50 COP &#; 2.0 LT -35°C 0 < PA &#; 2 COP &#; 1.1 2 < PA &#; 8 SEPR &#; 1.70 8 < PA &#; 20 SEPR &#; 1.80 PA > 20 COP &#; 1.1'&#;' means 'greater than or equal to'
'&#;' means 'greater than or equal to'
The COP, where applicable, should be measured at the specified standard rating points shown in Table 1.2.
Table 1.2 Testing conditions for COP of air-cooled condensing units at the standard rating points
Temperature category Evaporating temperature (Dew point) Ambient (Condenser air-on) temperature Compressor suction gas temperature High temperature units +5°C 32°C 20°C Medium temperature units -10°C 32°C 20°C Low temperature units -35°C 32°C 20°C
Where:
The following standards, where applicable, shall be used for measuring and calculating product performance:
Please note that performance data obtained in accordance with the test procedures set out in BS EN -2: will be accepted as an alternative to testing in accordance with BS EN -2: until further notice.
For product categories where a COP threshold is specified, performance data obtained in accordance with BS EN : will be accepted as an alternative to BS EN : until further notice.
Product performance can either be determined using Method A or Method B to determine COP, or Method C to determine SEPR, subject to the following reporting requirements:
Under method A:
a) Actual product performance should be determined at two test conditions close to the relevant standard rating point specified in Table 1.2 that comply with the following limits:
i. Evaporation temperature shall be within ±1°C of the standard rating point.
ii. Ambient temperature shall be within ±5°C of the standard rating point, and one point shall be above the standard rating condition, and one below it.
iii. Suction Temperature shall be within ±1°C of the standard rating point.
The following measurements shall be made at each test condition with the level of measurement uncertainty specified in Table 3 of BS EN -2: , whilst the product operating under stable conditions at full load:
i. Condensing and evaporating pressures and dew point temperatures at the compressor inlet and outlet.
ii. Superheat and sub-cooling at the compressor&#;s inlet and the product&#;s outlet.
iii. Condenser air inlet temperature.
b) The condenser&#;s UA value is determined at each test condition using the verified compressor performance data to establish the heat rejection rate.
c) The arithmetic mean of the UA values at the two test conditions is used to determine the condensing temperature, and the product&#;s performance at the standard rating point.
a) Details of the calculation used to determine product performance.
b) The following information on the product&#;s compressor:
i. Refrigerating capacity and COP at the appropriate standard rating point specified in BS EN : , and at the relevant standard rating point specified in the eligibility criteria for &#;refrigeration compressors&#;.
ii. Evidence that the product&#;s compressor is listed on the Energy Technology Product List, or that its performance has been independently verified
iii. A copy of the manufacturer&#;s published performance data (or a print out of its key performance data from the manufacturer&#;s design/selection software).
Under method B, product performance shall be demonstrated by testing the product in accordance with BS EN -2: &#;Compressor and condensing units for refrigeration. Performance testing and test methods. Part 2: Condensing units&#;.
Under method C, product performance shall be demonstrated by testing the product in accordance with the procedures in BS EN -2: &#;Compressor and condensing units for refrigeration. Performance testing and test methods. Part 2: Condensing units&#;. The test conditions to be used, and the SEPR calculation method, should be those described in BS EN : &#;Condensing units for refrigeration &#; Rating conditions, tolerances and presentation of manufacturer&#;s performance data&#;.
For the avoidance of doubt COP test data should be presented to 1 decimal place. SEPR test data should be provided to 2 decimal places. As an example, a product in the high temperature category with a COP of 3.3 would be deemed to not meet the performance requirements.
Any of the following testing routes may be used to demonstrate the conformity of products against the requirements:
Further information regarding the first three routes can be found in the ETL Testing Framework.
Where applications are being made for a range of two or more products that are variants of the same basic design, test data may be submitted for a representative selection of models, provided that all variants:
The representative models shall be selected by dividing the range of products into groups of models with similar design characteristics, and testing a model in each group. The performance of each model in the group shall be predicted using a validated mathematical model. As a minimum, at least one model shall be tested in each range of products.
It should be noted that:
Products listed on the ETL may be subject to the scheme&#;s conformity testing programme in order to ensure listed models continue to meet the ETL requirements.
This specification is scheduled for review during the /22 ETL review cycle.
As the use of new low Global Warming Potential (GWP) refrigerants becomes more widespread in the air cooled condensing unitair cooled condensing units market, eligibility and performance requirements may be reviewed, to account for the range of new lower GWP refrigerants that will become more widespread due to the EU F-gas regulations. The performance parameters may also be reviewed; products could potentially be assessed on their overall environmental impact accounting for seasonal efficiency, refrigerant GWP and refrigerant leakage.