Abstract
Performance of a reciprocating compressor for automotive air-conditioning systems have been analyzed, taking into consideration two-phase flow and oil in circulation. R-134a is used as refrigerant. The compressor used is a typical automotive swash plate type compressor driven by a 10 HP variable-speed electric motor and lubricated by Polyalkylene Glycol (PAG) oil. The variables measured during the experiment included pressure, temperature, oil concentration, total mass flowrate and vapour mass flow at inlet and outlet of compressor. The experiment was performed at varying compressor speeds, compression ratios and vapour quality. The results revealed some unknown aspects of compression process of automotive air-conditioning systems. The vapour quality does not affect volumetric efficiency, but influences isentropic efficiency of the compressor. Isentropic efficiency decreases with increasing vapour quality that ranges from 80 to 90 %. During compression process, part of liquid refrigerant evaporates. However, at outlet of compressor, refrigerant-oil mixture never reaches steady state. The evaporation ratio decreases with increasing compressor speed and vapour quality.
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Gu, J., Wang, S., Gan, Z. (2014). Two-Phase Flow in Compressor. In: Two-Phase Flow in Refrigeration Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8323-6_5
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DOI: https://doi.org/10.1007/978-1-4614-8323-6_5
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