At +2°C and +

At +2°C and +7°C the heat delivered from the heat pump exceeds the required heat from the house and is therefore operated in part load. COP for part load operation is interpolated by using the equation for staged capacity units at page 26 in the standard. At +2°C the interpolation is made between full load operation and operation at 47% part load, at +7°C the interpolation is made between part load operation at 57% and 44% of the heat pump capacity