Reciprocating Compressors – Discharge Temperature

Properly cooled compressor cylinders stay reasonably close to the theoretical adiabatic (isentropic) process with respect to discharge temperature. Therefore, the adiabatic discharge temperature equations in Section 100 may be used to predict the discharge temperature with fairly good accuracy. These equations can be rewritten as follows so that Fahrenheit temperature may be used:

ts and td are in Fahrenheit.

This equation is applicable for machines with ideal cylinder cooling, and may be used as a first approximation for all applications. If more accurate estimates are needed, refer to Section 360 of this manual, “Application and System Considerations” where cylinder cooling and deviations from Equation 300-21 are discussed. Refer to Figure 300-9 for a graphic representation of Equation 300-21.

Theoretical Discharge Temperatures Single-Stage Compression

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