Experiment: Heat pumps, Basic equipment (115 V, 50/60 Hz)

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Objective: Record and analyse the pressure-enthalpy diagram for a compression heat pump

An electric compression heat pump consists of a compressor with a drive motor, a condenser, an expansion valve and an evaporator. Its functioning is based on a cyclical process with phase transition, through which the working medium in the pump passes; ideally, this process can be divided into the four steps comprising compression, liquefaction, depressurisation and evaporation. The theoretical performance coefficient of an ideal cyclical process can be calculated from the specific enthalpies h₁, h₂ and h₃ read from a Mollier diagram. Determining the enthalpies h₂ and h₃ of an ideal cyclical process and the quantity of heat ΔQ₂ supplied to the hot water reservoir per time interval Δt makes it possible to estimate the mass flow of the working medium.

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