The annual performance factor is defined by the ratio of the amount of heat produced by the entire system to the total amount of electricity used, including the amount of electricity for peripheral consumers (pumps, emergency heating element, control system, etc.). The annual performance factor is therefore an individual value that depends, among other things, on the building, the climatic conditions, the construction method, the heat source, the space heating and the user behaviour over the course of the year. In contrast, the coefficient of performance or COP is only a snapshot that describes the ratio of the heating energy generated to the electrical drive energy absorbed by the actual heat pump itself under defined operating conditions, see coefficient of performance ε (COP) according to EN 14511.
The annual performance factor is used, among other things, to make a forecast of the profitability of a heat pump system. A ► JAZ calculator is used by the "Bundesverband Wärmepumpe e.V." (bwp) online.
Formula: JAZ = annual heating capacity / annual power consumption
Unit: no
Note: Since heat pumps are subsidized by the BAFA (Federal Office of Economics and Export Control), special subsidy conditions and information on the calculation of the annual performance factor apply. For example, in order to comply with the funding guidelines, BAFA allows compressor heating and control systems not to be taken into account in the calculation of the annual performance factor.
Source: bauwion
