PAS 57:2003 pdf download Cellar cooling equipment — Procedure for determining performance and calculating energy efficiency
This Publicly Available Specification (PAS) specifies procedures for determining the performance andenergy efficiency ofcellar cooling equipment with a capacity between 2 kW and 12 W,at a standard ratingcondition of 10 °C air onto the evaporator and 32 °C air onto the condenser, using air cooled condenserscategorized as either:
a) a packaged system, comprising all components mounted on one base for “through the wall
installation;orb) a split system, with the equipment supplied in two parts (evaporator and condensing unit) to beconnected on site; or
c) a remote system,with equipment supplied in three parts (evaporator, compressor/receiver unit andcondenser) to be connected on site.
This PAS is aimed at suitably qualified and experienced personnel in the refrigeration industry
2 Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
BS EN 328, Heat exchangers – Test procedures for establishing the performance of forced convection unilair coolers for refrigeration.
3 Terms and Definitions
For the purposes of this Publicly Available Specification, the following terms and definitions apply
3.1
cellar cooling equipment
retrigeration svstem designed to maintain an indoor environment at a condition suitable for the storage otchilled beverages, typically 10 C to 12C
3.2
refrigerantworking fluid in a refrigerating system absorbing heat at low pressure/temperature by evaporation andrejecting it at a higher pressure/temperature by condensation
3.3
liquid
working fluid remaining liquid during the absorption of heat
3.4
cooling capacitytotal heat (kW) removed by the cellar cooling equipment from test room B
3.5
evaporator pressure
absolute pressure of the refrigerant at the evaporator outlet
3.6
compressor discharge pressure
absolute pressure of the refrigerant at the compressor discharge port
3.7
expansion device
device used to control the flow of refrigerant in the evaporator and reduce the refrigerant pressure
3.8
system energy consumption
total electrical energy consumption of the cellar cooling equipment as measured during the system
efficiency test
3.9
liquid receiver
pressure vessel permanently installed in the high pressure side of a refrigeration system to provide areserve of liquid refrigerant and for the storage of the refrigerant charge during service
3.10
filter drier
device used to remove water or water vapour from refrigerant
3.11
compressormechanically operated component for compressing a refrigerant vapour
3.12
heat load
electrical heating appliance (resistance heater(s)], with adjustable output, used to balance the heatextraction rate of the cooling unit
3.13
thermalmass
pre-cooled liquid or solid mass used to dampen temperature changes in the test room
3.14
thermostat phial
temperature sensing part of the thermostat
4 Principle
The energy efficiency ofcellar cooling equipment is evaluated by measuring its cooling capacity and energyconsumption at specified conditions and expressing the results as a ratio.
5 Preparation
51General
The cellar cooling system under evaluation shall be supplied complete.All components supplied as part of the cellar cooling equipment system shall be included in the evaluationand used in accordance with the manufacturer’s instructions.The cellar cooling equipment shall be evaluated in the “as-sold” condition,i.e. installed and commissionedas recommended by the manufacturer.