1. © Fraunhofer ISE Simplified method for the calculation of the seasonal performance factor of heat pumps VDI 4650 Marek Miara Fraunhofer-Institut für Solare Energiesysteme ISE Annex 39 Workshop 12.11.2013, Tokyo

2. © Fraunhofer ISE COP SCOP EER SEER SPF HSPF η, (eta) APF JAZ SPF JAZ Coefficients of efficiency CSPF Different questions – proper coefficients

3. © Fraunhofer ISE VDI Verein Deutscher Ingenieure  Organisation with more than 150 years history  Promotion and representation of engineers  Publisher of VDI guidelines „VDI Richtlinien”  More than 2000 active guidelines

4. © Fraunhofer ISE VDI 4650 Part 1  Simplified method for the calculation of the seasonal performance factor of heat pumps SCOP  Input for the calculation: COP values and correction factors

5. © Fraunhofer ISE Calculation method of SCOP Ground source heat pumps COP B0/W35 3 correction factors (operation conditions) SCOP H COP B0/W35 3 correction factors (operation conditions) SCOP W % factor α (coverage of HP in mono- energetic operation) SCOP seasonal (annual) coefficient of performance

6. © Fraunhofer ISE Correction factors......decide about accurateness of the results

7. © Fraunhofer ISE

9. Criticism / weaknesses of VDI 4650 Main points:  Unclear source for the correction factors  Lack of calculation method for inverter heat pumps  Inflated results for calculation of high temperature heat pumps  Inflated results for calculation of domestic hot water

10. © Fraunhofer ISE Amendment 2014 Main points:  Well documented method of determination of correction factors  Inclusion of calculation method for inverter heat pumps  Correction of the factors for calculation of high temperature heat pumps  Correction of the factors for calculation of domestic hot water

11. © Fraunhofer ISE Example New factors for DHW Comparison between VDI 4650 and DIN EN 16147: Heat pump, thermal power 6 kW by B0 / W35 and COP_N von 4,9 Buffer storage (DHW Storage), volume of 175 litres and power demand of heat pump in standby modus 35 W “Zapfprofil” XL:  2,85 efficiency according to DIN EN 16147  3,26 efficiency according to DIN EN 16147 corrected with standby – loses  3,60 efficiency according to “new” VDI factors  4,39 efficiency according to VDI 4650 Part 1: 2009

12. © Fraunhofer ISE Comparison VDI 4650 vs. „WP Effizienz” Project (Monitoring) measurement VDI 4650 difference air to water heat pumps brine to water heat pumps water to water heat pumps

13. © Fraunhofer ISE Comparison between different methods VDI 4650 vs. other methods A/W heat pump with 8,3 kW capacity at A2/W35 and T b =-8°C, Source: Annex 39 Workshop SCOP/SPF

14. © Fraunhofer ISE What is not VDI 4650 Summary  “Ultra”-accurate simulation program taking into account all possible margin conditions  “crystal ball” good enough for foresighting changed operation conditions and “non-standard” users behaviours  The only and the best available tool

15. © Fraunhofer ISE What is VDI 4650 Summary  “possible easy and sufficiently accurate” tool for calculating of SCOP values (aimed accuracy not less than 10%)  Chosen tool for the HP incentive program in Germany (BAFA)  Good basis for calculating ecological and financial benefits resulting from using of heat pumps

16. © Fraunhofer ISE Thank you Marek.Miara@ise.fraunhofer.de