Data for part load

 Data for part load operation is calculated from equations of “option B” at page 27 in the standard, where COPmin= 0.89*COP at power output Phpmin=0.5*Php for a fixed capacity unit.
From Lot 1 two different results are obtained, “etas” and “average COP”. Etas are calculated by involving the primary energy factor of 2.5 which makes it difficult to compare with other calculated SPF. However, “average COP” corresponds to SPF 1.  
Lot 10
Air to air heat pumps The design load of the house is chosen to 8,5kW, which is the design load that best corresponds to the size of the house in the field measurement. The house in the field is installed in a climate, similar to “colder” climate, therefore “colder” is chosen. The test