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Form: calculation of COP and SCOP for a heat pump system
How to calculate instantaneous efficiency and seasonal efficiency, and explain the difference to the customer
Use this schedule as support when you need to assess or explain a heat pump's efficiency — either based on your own measurements or from the manufacturer's data.
§Step 1 — Collect basic data
- 01Measured or specified heat output (kW)
- 02Measured or specified power consumption for compressor and auxiliary equipment (kW)
- 03Return and flow temperature at the measurement time.
- 04Climate zone and standard conditions if you use the manufacturer's SCOP data (EN 14825)
§Step 2 — calculate COP for current moment
COP = leveret varmeydelse ÷ tilført elektrisk effekt, målt ved én bestemt kombination af ude- og fremløbstemperatur. Gentag gerne målingen ved flere forskellige driftsforhold, så du får et billede af, hvordan COP ændrer sig med udetemperaturen.
§Step 3 — assess SCOP for entire season
- 01Use the manufacturer's SCOP value from the datasheet if it exists for the system's climate zone
- 02Compare the stated SCOP with your own measurements of COP under varying conditions
- 03Be aware that actual supply temperature in the specific house can differ from standard conditions
§Step 4 — explain to customer what numbers mean
- 01Explain the difference between a snapshot (COP) and a yearly average (SCOP)
- 02Tell what in their specific house can pull the numbers up or down
- 03Note the assumptions used so the calculation can be reproduced later