The European standard "EN 16147 Electrically driven compressor heat pumps - Testing, performance rating and requirements for the marking of domestic hot water units" describes the requirements and test methods for testing, performance assessment and calculation of water heating energy efficiency of air/water, brine/water, water/water and direct exchange/water heat pump water heaters and heat pump combination heaters with electrically driven compressors and connected to or incorporating a domestic hot water storage tank for domestic hot water production. This standard only includes the test procedure for domestic hot water production of the heat pump system.
Test procedures for simultaneous operation of domestic hot water production and space heating are outside the scope of this standard. Simultaneous means that domestic hot water production and space heating production occur simultaneously and can interact. The seasonal efficiency of space heating for heat pump combination heaters is determined according to the standard “DIN EN 14825 Air conditioners, liquid cooling packages and heat pumps with electrically driven compressors for space heating and cooling - Testing and rating under part load conditions and calculation of seasonal performance”.
This European standard applies only to water heaters supplied as a heat pump and storage tank package. In the case of water heaters consisting of several components with refrigerant connections, this standard applies only to those designed and supplied as a complete package. On the other hand, this standard does not specify requirements for the quality of the water used.
For the purposes of this standard, the following definitions apply in addition to the terms and definitions given in EN 14511-1:
The test apparatus shall be designed so that all requirements for setting values, stability criteria and measurement uncertainties in accordance with this standard can be met. Water systems or other heat transfer fluid systems shall be sufficiently free of entrained gas to ensure that the measured results are not significantly affected.
The inlet and outlet temperatures of domestic water are measured at the centre of the flow and as close as possible to the device. The response time and sampling interval of the temperature sensor should be selected to maintain the uncertainties in the table given in the standard.
Ducted air systems must be sufficiently airtight to ensure that measured results are not significantly affected by air exchange with the surroundings. Measurement uncertainties must not exceed the values specified in the table.
The size of the test room for the external heat exchanger of air source heat pumps should be selected so that there is no resistance to air flow at the air inlet and air outlet holes of the test object. The air flow in the room cannot initiate any short circuit between the two holes, and therefore the air flow velocity at these two locations when the test object is closed should not exceed 1,5 m/s.
Unless otherwise specified by the manufacturer, the air inlet and air outlet openings must not be less than 1 m from the test chamber surfaces. This also applies to all measurement channels.
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