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Effects of lubricating oil on the performance of a semi-hermetic twin screw refrigeration compressor

Wu, X, Xing, Z, He, Z, Wang, X ORCID: 0000-0003-4293-7523 and Chen, W 2017 , 'Effects of lubricating oil on the performance of a semi-hermetic twin screw refrigeration compressor' , Applied Thermal Engineering, vol. 112 , pp. 340-351 , doi: 10.1016/j.applthermaleng.2016.10.038.

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Abstract

Lubricating oil is often employed in a twin-screw refrigeration compressor for lubricating bearings, sealingleakage paths, cooling refrigerant gas and regulating capacity. In this paper, the effect of lubricatingoil on the performance of a semi-hermetic twin-screw refrigeration compressor is investigated. A mathematicalmodel is established and a comprehensive experimental investigation is performed for this purpose.The model is validated using experimental data and then used to investigate the effect oncompressor performance of lubricating oil supplied to the suction and discharge end bearings, andreturned to the suction pipe. The results show that the compressor performance is reduced as the compensationoil injection flow rate increases in the suction pipe. However, as the compensation oil injectionposition moves from the suction pipe to a proper compression chamber position, the compressor efficienciesincrease as the oil flow rate increases. The results also show that the compressor performancedecreases as the oil flow rate increases at the suction end bearing. But the effect on the compressorperformance of the lubricating oil supplied to the discharge end bearing depends on the oil temperature.Low temperature oil supplied to the discharge end bearing increases the compressor performance, whilehigh temperature oil lowers the compressor performance. These analyses provide useful information foroptimizing lubricating oil distribution to maximize energy efficiency in semi-hermetic twin screwrefrigeration compressors.

Item Type: Article
Authors/Creators:Wu, X and Xing, Z and He, Z and Wang, X and Chen, W
Keywords: twin screw, refrigeration compressor, lubricating oil, performance
Journal or Publication Title: Applied Thermal Engineering
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 1359-4311
DOI / ID Number: 10.1016/j.applthermaleng.2016.10.038
Copyright Information:

Crown Copyright 2016 Published by Elsevier Ltd. All rights reserved.

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