ASHP sizing for Freezing Conditions

[TrystanLea]

Another test result this evening, mine ran ~7.5% below datasheet suggested capacity over 3 hours at 0.84C outside 4.57 kW rather than 4.94 kW, I’m being overly precise here… roughly 10% below datasheet.

5kW R410a Ecodan PUHZ-W50VHA2(-BS) maximum output testing

Test 3 Outside temperature back of the unit 0.84C Metoffice: 0.7C Metoffice dew point: -1.3C Metoffice relative humidity: 87% Average heat output 4.57 kW [image] The datasheet suggests that capacity should be 5 kW at 2C ambient and 4.5 kW at -7, so about 4.94 kW at 0.84C. So ~7.5% less than the data sheet output in this test. 1st cycle: 4.4 kW, outside temp 0.86C 2nd cycle: 4.5 kW, outside temp 0.27C 3rd cycle: 4.8 kW, outside temp 1.34C

@ColinS had less favourable results 20-30% below I believe.