Discharge Temperature

While head is normally not a particularly significant value in the selection of the reciprocating compressor, it is used for comparison with other types of compressors. Equation 2.66, the equation for adiabatic head, is recalled as

I he discharge temperature can be calculated by rewriting Equation

T] = absolute inlet temperature T2 = absolute discharge temperature

Why use an adiabatic relationship with a compressor whose cylinder is almost always cooled? An assumption made in Chapter 2 on adiabatic isentropic relationships was that heat transfer was zero. In practical applications, however, the cooling generally offsets the effect of efficiency. As a side note, cylinder cooling is as much cylinder stabilization for the various load points as it is heat removal.

The work-per-stage can be calculated by multiplying the adiabatic head by the weight flow per stage.

where

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