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Air Coolers

Definitions

Unit Air Cooler
A refrigeration system component transferring heat from air to a refrigerant or liquid consisting of one or more fans and a coil with refrigerant distributing and collecting headers.

Standard capacity
Cooling capacity for standard temperature conditions (dry conditions).

Nominal capacity
Standard capacity multiplied by a fixed ratio (wet conditions).

Fan power
The electric power absorbed by the fan motor

Testing requirements

Performances
Standard ratings shall be established at the Standard Rating Conditions. All standard ratings shall be verified by tests conducted in accordance with the following standard:
EN 328: Forced convection unit air coolers for refrigeration - Test procedure for establishing the performances.

Rating requirements

According to EN 328 the following standard conditions are used:

Standard conditions for refrigerants Air inlet temperature (°C) Evaporating Temperature (°C)
SC1 + 10 0
SC2 0 - 8
SC3 - 18 - 25
SC4 - 25 - 31

Qualifying tests are conducted on one standard condition based on the evaporating temperature range for which selection data are specified.
Certified characteristics

The following characteristics of Air Coolers are certified :

  • Standard capacity
  • Fan power
  • Air flow rate
  • Surface area
  • Liquid side pressure drop (only for liquids)
Presentation of data in literature

5.1 Dry capacities and wet capacities

Standard capacities are measured at standard temperature conditions without condensation or frost formation on the cooler surface.
The participant is entitled to specify nominal capacities in his literature for practical (wet or frosted) conditions. In this case he is not obliged to specify the standard capacities in his literature.
The nominal capacities are related to the standard temperature conditions and must be calculated with the ratios in accordance with the following table.
This table also shows the relative humidity (RH) related to these ratios.

ConditionsRH (%)Wet enhancement factor (Ratio Nominal capacity / Standard capacity)
SC1851.35
SC2851.15
SC3951.05
SC4951.01
For a certified range, the ratios and conditions related to the used test conditions shall be specified in all literature giving nominal capacities. The participant is allowed to publish selection capacities for other temperature conditions and relative humidities as long as they are based on air inlet temperatures and related to the nominal capacities. He shall make it clear that the selection capacities are not certified.

5.2 DT1

Nominal capacities should be based upon entering air temperature. The test conditions in the European standard are based on DT1 (DT1 = difference between the entering air temperature into the cooler and the temperature corresponding to the saturated refrigerant pressure at the outlet of the cooler).

Therefore it was decided that nominal capacities in leaflets, brochures, etc. should also be based on DT1.

This means a big change for the Industry as a significant number of manufacturers are still using Dtm to define nominal capacities (Dtm = difference between the mean of entering and leaving air temperature into the cooler and the temperature corresponding to the saturated refrigerant pressure at the outlet of the cooler).

Using the entering air temperature as reference temperature enables easier checking on the delivered capacity. With DT1 there is a direct relation between the tested capacity and the nominal capacity used in leaflets, brochures, etc.

All participants within the certification programme will use DT1 which will create an uniform presentation of capacity.

WARNING ! Do not compare capacity at DT1 = 8K with capacity at Dtm = 8K

For example:
An air cooler unit cooling air from 0°C to -3°C with an evaporating temperature of -8°C works at: DT1 = 8K, but Dtm = 6,5K.
The capacity for the same unit air cooler at Dtm = 8K will in figures be at least 25% higher. This is a matter of presentation because it is in fact the same air cooler.


Symbols used in the directory

Pc nomNominal capacity (wet conditions)kW
SC 1, 2,3 or 4Standard conditions
PeFan motor power imputkW
MPSMain Power Supply

Air Cooled Condensers


Definitions

Forced convection air cooled refrigerant condenser
A refrigeration system component that condenses refrigerant vapour by rejecting heat to air mechanically circulated by fans

Range
Listing of models with some common features

Standard capacity
Total heat flow rejected by the refrigerant at standard temperature conditions

Fan power
Electric power absorbed by the fan motors

Air flow rate
Air flow with dry and clean air

A-weighted sound power level
Sound power generated by the condenser expressed in decibels and weighted in accordance with standardised procedures

Energy ratio
The certified nominal capacity in kW divided by the total certified power imput of the fan motors in kW at the standard rating condition.

Testing requirements

Performance characteristics
Standard ratings are verified by tests conducted in accordance with the following standard:
EN 327: Tests procedures for establishing performance of forced convection air cooled refrigerant condensers

Sound power levels are established using one of the following international standards:
ISO 3741: Presision methods for broad-band sources in reverberation rooms
ISO 3744: Engineering methods for free-field conditions over a reflecting plane
ISO 3745: Presision methods for anechoic and semi-anechoic rooms
ISO 9614-1: Determination of sound power levels of noise sources using sound intensity

Certified characteristics

The following characteristics of Forced Convection Air Cooled Refrigerant Condenser are certified:

  • Standard capacity
  • Fan power input
  • Energy class
  • Air flow rate
  • A-weighted sound power level
  • Surface Area
Symbols used in the directory

TDDifference between entering air temperature and condensing temperatureK
Y / D speedrpm
PcNominal capacity (wet conditions)kW
w / wg (index)
PeFan motor power inputkW
REnergy ratio td>
Lp@10mdB(A)
LwSound Power leveldB(A)
MPSMain Power Suply

Dry Coolers

Definitions

Forced Convection Liquid Coolers
A refrigeration system component that cools liquid by rejecting heat to air mechanically circulated by fans

Range
Listing of models with some common features.

Standard capacity
Total heat flow rejected by the liquid at standard temperate conditions

Fan power
Electric power absorbed by the fan motors

Air flow rate
Air flow with dry and clean air

A- weighted sound power level
Sound power generated by the dry cooler expressed in decibels and weighted in accordance with standardised procedures.

Testing requirements

Standard ratings are verified by tests conducted in accordance with the following standard:

Performances characteristics
EN 1048
Tests procedures for establishing performance of forced convection liquid coolers.

Sound power levels
ISO 13487
Heat exchangers - Forced convection air cooled refrigerant condensers and dry coolers - Sound measurement

Certified characteristics

The following characteristics of Forced Convection Liquid Coolers are certified:

  • Standard capacity
  • Fan power imput
  • Energy class
  • Air flow rate
  • Liquid side pressure drop
  • A-weighted sound power level
  • Surface area
Symbols used in the directory

Y / D speedrpm
PcNominal capacitykW
DpPressure dropkPa
w / wg (index)
PeFan motor power imputkW
REnergy ratio td>
Lp@10mdB(A)
LwSound Power leveldB(A)
MPSMain Power Suply

General Reference documents


Certification Manual 13th (November 2016)
Reference documents


OM-2-2017


RS 7/C/008-2017