The profitability of heat pumps is described by the so-called coefficient of performance ε. The coefficient of performance is also called the Coefficient of Performance (COP). It is defined by the ratio between the heating power generated and the electric drive current absorbed by a heat pump. The higher this number, the better the efficiency. In principle, the coefficient of performance can be determined according to DIN EN 255-3 or DIN EN 14511, each of which is based on different spreads at the flow temperature, so that different coefficients of performance are also generated. In order to be able to compare comparable values of different systems, both the standard and the framework conditions under which the values were determined under laboratory conditions must coincide. For this purpose, the following standardized test abbreviations are used, which describe the operating status of the test:
W= Water, Water
B= Brine (=Brine)
S= Brine
A= Air (=Air)
E= Ground
Example: A0/W35 = 3.0
The marking means that an air source heat pump must be installed at an outside air temperature of 0°C (A0) and a flow temperature of 35°C (W35) 3.0 kW of heating power is generated from one kilowatt of electric drive power. In this example, the coefficient of performance or COP is 3.0. Basically, when comparing the coefficients of performance, it is important to pay close attention to the standard and the operating points according to which the values were determined. On the other hand, the results of the independent tests of the EHPA (European Heat Pump Association) were based on standardised conditions, so that the values published there are always comparable.
Formula: COP = Heating Capacity / Electr. Drive power
unit: no
Source: bauwion
