Qualitative analysis of the results of experimental studies of heating and cooling of parts of the cylinder-piston group of a piston compressor with regenerative heat exchange

An analysis of piston compressor cooling revealed that the use of regenerative heat exchange in a piston compressor significantly improves compressed gas cooling by reducing the thermal resistance of the separating wall. Furthermore, it was found that the heating and cooling times of the cylinder-piston group components are among the most significant parameters of the studied machine. Based on the qualitative analysis, it was established that when operating in compressor mode, the dependence of the temperature change of the cylinder-piston group components upon heating is parabolic, with the upper portion of the cylinder being the hottest part of the working chamber. The heating time is approximately 900 s. Crankshaft speed has a more significant effect on the heating of the cylinder-piston group components than the discharge pressure of the compressed gas (approximately twice as much). When operating in pump mode, the dependence of the cylinder-piston group components on the cooling time is hyperbolic; the cooling time ranges from 80 s to 90 s, which is an order of magnitude shorter than the heating time. As the speed increases, the cooling time decreases due to the intensification of the heat transfer coefficient between the dividing wall and the coolant in the working chamber. These results can be used to optimize the operating time of a piston compressor with regenerative heat exchange with regenerative heat exchange in both compressor and pump modes, significantly reducing calculation time.
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