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在往复式压缩机的设计问题上,必须考虑到高压下气体的热力学性质。 在气体压缩机设计时,常常规定进气温度、进气压力、排气压力,而要求求出排气温度是多少。由于在往复式压缩机的气体压缩过程中,可近似地看成可逆过程。所以,给定进气温度、进气压力、排气压力,求排气温度的问题,在热力学上自然也是按可逆压缩,即应按等熵压缩（绝热压缩）计算气体温度的变化的问题来计算:
In the design of reciprocating compressors, the thermodynamic properties of gas under high pressure must be considered. In the design of gas compressors, often provide intake temperature, intake pressure, exhaust pressure, and asked to find out how much exhaust temperature. As in the reciprocating compressor gas compression process can be approximated as a reversible process. Therefore, given the intake air temperature, intake pressure, exhaust pressure, exhaust temperature, the problem of thermodynamics is also based on reversible compression, which should be isentropic compression (adiabatic compression) to calculate the problem of changes in gas temperature Calculation: