scope:

This Standard specifies the test conditions and test procedures for determining the energy performance characteristics of single-circuit air source heat pump water heaters. It applies to both stand-alone heat pump water heaters and heat pumps with the condenser integral with a storage tank. The variation of coefficient of performance (COP) and electric power used as a function of operating conditions are determined so that the results can be used in annual performance calculations of heat pump applications for sanitary hot water supply applications.

This Standard also specifies methods of testing and reporting the energy performance characteristics of electrical driven heat pumps using a single refrigeration circuit and having one evaporator and one condenser. Products with two evaporators that operate exclusively may also be tested in each mode.

The energy performance of a heat pump is determined by operating the product under a range of controlled environmental conditions and measuring the electrical power input and the thermal energy output in the form of hot water where the condenser is integral with a storage tank. Slightly different test procedures are specified for stand-alone and integral heat pump configurations.

This Standard also specifies a method for a 24 h tapping hot water load test for heat pumps to simulate domestic hot water usage behaviour under a range of controlled environmental conditions to determine a range of energy performance characteristics.

NOTE: This Standard uses the daily load profile of AS/NZS 4234.