12 September 2006

Test procedure and seasonal performance calculation for residential heat pumps with combined space and domestic hot water heating


IEA HPP Annex 28 entitled “Test procedure and seasonal performance calculation for residential heat pumps with combined space and domestic hot water heating” has been started to develop a calculation method for the Seasonal Performance Factor (SPF) of combined operating heat pump systems.

Since a calculation requires a characteristic of the component efficiency (COP) and the heating capacity, an adapted test procedure has been developed in parallel to enable performing the calculation. Consequently, IEA HPP Annex 28 had the objective to deliver
– An easy-to-use calculation method (“hand calculation”) to calculate the Seasonal Performance Factor of combined operating heat pump systems without extensive computational expense
– An adequate test procedure to provide the required input data of the heat pump system with a minimum of testing expense

Following these objectives the final report of the IEA HPP Annex 28 is structured in two parts:

Part 1) Proposals for calculation method and test procedure
The first part comprises an executive summary of the IEA HPP Annex 28 project and the two essential results, namely the proposal for the calculation method and the proposal for the test procedure formatted in the layout of the template for draft standards of the European standardisation organisation CEN.

Part 2) Project description and standard documentation
The second part comprises the background on the project, the national contributions, and introduction to the present situation in standardisation and systems on the markets, performed evaluations and the discussion and decision of the approacheds, which led to the calculation and test procedure in part 1. further in-depth information can be found in the country reports on Task 1 and Task 2 and 3 of the participating countries which are referenced in the report.