Input to the calculations

Input to the calculations The calculation of the seasonal performance (SPF or SEER) is performed using a temperature bin method where each bin represents one degree Celsius and the number of bin hours occurring at the corresponding temperature is given. The cooling season is represented by one climate that span from 17°C-40°C while the heating season is represented by three different climates: one colder, one average and one warmer, that
SCOP
Parasitic losses
SCOPon
back up heater
SCOPnet
Heat  pump
Head losses
31
span from -30°C-15°C, see Table 29 and 30 in prEN 14825:2009 draft Nov 09. Each climate corresponds to one design temperature and one design heat load of the building.
The heating/cooling demand and the number of bin hours for the different climates are determined as templates, taking different aspects into account; the climate, type of building and building characteristics, set point and set back settings and internal gains. Those aspects also decide the number of hours in which the heat pump works in active mode, thermostat off mode, standby mode, crankcase heater mode or off mode. The electricity consumptions at the different modes are determined from tests. These effects are called the parasitic losses.