1. IEA HPP Annex 28 Test procedure and seasonal performance calculation of residential heat pump with combined space and domestic hot water production

2. 2 IEA HPP Annex 28 Introduction to the project Workshop IEA HPP Annex 28 8 th International Heat Pump Conference, Las Vegas, 30 May 2005 Carsten Wemhöner, Operating Agent IEA HPP Annex 28 Institute of Energy, University of Applied Sciences Basel IEA HPP Annex 28 N 139

3. 3 Outline of the presentation  Outline of the workshop  Background of the project  Results of the state-of-the-art survey, conclusions  Overview of national contributions  Project structure of the IEA HPP Annex 28

4. 4 Background of IEA HPP Annex 28 Source: KWT Source: Stiebel Eltron

5. 5 Background of IEA HPP Annex 28 Solution to overcome this problem of missing comparability  Possibility of comparing different heat pump system layouts or heating systems (system calculation)  Energy labelling (indication at point of sale)  Uniform technical data (component testing)

6. 6 Background of IEA HPP Annex 28  Manufacturers:Provision of uniform technical data (competitiveness)  Designers:Technical information for system comparison  Customers:Product information for purchase decision (energy costs, environmental impact)  Policy makers:Key values to set targets in directives (Kyoto protocol)  based on uniform and transparent testing and calculation

7. 7 Objectives IEA HPP Annex 28  Test procedure with a minimum of testing expense  Easy-to-use calculation methods  as recommendation for standardisation committees  for combined operating heat pump systems for space heating and domestic hot water production

8. 8 Objectives IEA HPP Annex 28  Transparent comparison of different heating systems  Reduction of trade barriers  Stimulation of technology improvements  Consumer confidence  Promotion of HP as environmentally sound technologies

9. 9 Facts IEA HPP Annex 28  Participants: AT, CA, CH (operating agent), DE, FR, JP, NO, SE, USA  Information: http://www.annex28.net  Project time: Jan 2003 – May 2005 Final report: October 2005

10. 10 Structure of IEA HPP Annex 28  Task 1: State-of-the-art survey  Task 2: Test procedure with minimum of testing expense  Systems on the market and under development  Existing standards for combined operating systems  Task 3: Easy-to-use calculation method  General to cover different system configurations on the market  Enough data to perform the seasonal performance calculation  "Hand calculation method" without extensive computation  Transparent method on the basis of publicly available data

11. 11 State-of-the-art survey - markets  Europe:  North-America  Mostly alternate operating systems  Some simultaneous operating systems, research activities  Japan  Mostly simultaneous operating systems with desuperheating  Air-to-air heat pumps for combined air-conditioning/DHW  Little combined operation  Market introduction of system with combined floor heating/DHW

12. 12 State-of-the-art survey - standards  Europe  North-America  Testing standards for single operation modes heating and DHW  European calculation method under development, national regulations  Japan  Testing and calculation for single operation modes heating and DHW  Combined operation for Air-to-air heat pumps with desuperheater  Testing and calculation for single operation modes  Calculation by adaptation of American standard methods

13. 13 Conclusions - Scope  Alternate and simultaneous combined operating systems:  Alternate: switching of the heat pump from space heating to DHW operation

14. 14 Alternate operating system layout Source: WPZ Töss

15. 15 Conclusions - Scope  Alternate and simultaneous combined operating systems:  Simultaneous: space heating and DHW heat production at the same time, e.g. by  Desuperheating of compressed refrigerant  Subcooling of condensed refrigerant  Cascade system layout  Extraction of heat from the heating system supply line  Alternate: switching of the heat pump from space heating to DHW operation

16. 16 Simultaneous operating system layout Source: TU Dresden

17. 17 Conclusions - Scope  Alternate and simultaneous combined operating systems:  Simultaneous: space heating and DHW heat production at the same time, e.g. by  Desuperheating of compressed refrigerant  Subcooling of condensed refrigerant  Cascade system layout  Extraction of heat from the heating system supply line  Hydronic and air distribution system  Alternate: switching of the heat pump from space heating to DHW operation

18. 18 Conclusions – System boundary Generator with attached storages (heating buffer, DHW) and back-up generators (e.g. supplementary electrical resistance heating) Source: prEN 14335 general part

19. 19 Conclusions - Testing  Based on existing standards for single operation modes Heat pump DHW storage/ Instantaneous water heater Back-up heater  Black-box testing  System testing for highly integrated layouts

20. 20 Conclusions - calculation  Based on bin-methodology  Relative energy requirement in the bin corresponds to ratio of bin areas (weighting factor)  Operation conditions at operating point valid for the entire bin

21. 21 National contributions - focus

22. 22 Structure of the Workshop  Part 1: Introduction  Part 2: Calculation method  Part 4: Test procedure  Part 5: Conclusions, Implications and Discussion  Part 3: Experiences from systems in the field monitoring  Coffee break  Transparencies can be downloaded at Annex 28 website http://www.annex28.net

23. 23 Thank you for your attention!