Цитат:
The conventional way to express the effectiveness of refrigeration is Coefficient of Performance (COP). This is the ratio of heat extraction to energy input. Both are expressed in the same units, normally kilowatt (kW). For a system in which the mass flow rate is constant, COP becomes equal to the ratio of ratio of enthalpy change in the evaporator and enthalpy increase during compression. i.e. dh1/dh2. On the pH chart, enthalpy is shown as enthalpy per per unit mass, or specific enthalpy. The ratio dh1/dh2 is the rate of transfer of energy in the evaporator divided by the rate of transfer of energy in the compressor.
Ефективността или COP-а на една термо-помпена система се определя от отношението на разликите