Adiabatic efficiency of compressor
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When inputting parameters for the compressor, why does the smaller the input value of adiabatic efficiency, the larger the outlet temperature? Doesn't the smaller the adiabatic efficiency mean that the compression process deviates from the adiabatic process?
Hello! This is how I understand it: Adiabatic efficiency refers to the efficiency of effective work, and the effective work of the compressor here is gas compression, with the purpose of changing pressure rather than temperature. Therefore, changes in temperature can be regarded as non-effective work. The greater the adiabatic efficiency, the more non-effective work is done, and the higher the natural temperature.
Isentropic efficiency refers to the ratio of isentropic energy head and effective energy head. Isentropic energy head refers to the energy required for isentropic adiabatic compression of unit mass of fluid. ； The effective energy head refers to the effective work done by the compressor on unit mass of fluid. Because we generally specify the state of the outlet, the required energy is already fixed. In this way, the greater the efficiency, the smaller the effective energy head, and the corresponding calculated temperature will be smaller.