Real and Theoretical Energy Efficiency of Vapour Compression Heat Pumps

This paper presents several ways of calculating real and theoretical energy efficiency coefficients of vapour compression heat pumps in short and long time. Differences in the calculation are associated with taking into account, among others, various components of the heat pump responsible for the consumption of electricity, steady state or transient conditions, part or the nominal load ratio of heat pump. The calculation results are compared with the values of coefficients, which have been obtained theoretically.