IEA HPP Annex 28 Test procedure and seasonal performance calculation of residential heat pump with combined space and do

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

2. IEA HPP Annex 28 N 139 IEA HPP Annex 28Introduction to the project Workshop IEA HPP Annex 28 8th 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

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

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

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

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

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

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

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

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

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

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

14. Alternate operating system layout Source: WPZ Töss

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

16. Simultaneous operating system layout Source: TU Dresden

17. Conclusions - Scope • Alternate and simultaneous combined operating systems: • Alternate: switching of the heat pump from space heating to DHW operation • 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 airdistribution system

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

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. National contributions - focus

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

23. Thank you for your attention!