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A bench evaluation test for refrigeration oils in a refrigeration system using a screw compressor


Wu, W and Zhang, Z and Wang, X and Yang, L and Feng, Q, A bench evaluation test for refrigeration oils in a refrigeration system using a screw compressor, Applied Sciences, 9, (15) Article 3202. ISSN 2076-3417 (2019) [Refereed Article]

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2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (

DOI: doi:10.3390/app9153202


Refrigeration oil has a large effect on the performance of refrigeration systems. However, the physical and chemical indexes of fresh refrigeration oils often fail to reflect the actual operating characteristics, especially with respect to the degradation of refrigeration oils. In this paper, a bench evaluation test of refrigeration oils was carried out to investigate the degradation of synthetic refrigeration oils used with the refrigerant R134a, in a purpose-built, full-scale refrigeration system utilizing a screw compressor. To accelerate the degradation process of the refrigeration oil, the discharge temperature at the exit of the compressor was turned to a high level. Comparison tests of a mature refrigeration oil type A and a newly developed oil type B were performed under the same working conditions with 500 h of operating time. The performance of the screw compressor and refrigeration system was analyzed. The abrasion of the screw rotors and carbon deposition at the discharge port was investigated. Results showed that the bench evaluation test successfully predicted the degradation process of the refrigeration oils. The evolution analysis of the refrigeration oil viscosity and acid value during the bench evaluation test indicated that 15% of the physical and chemical indexes for refrigeration oil drain were too strict. Research work in this paper showed a more practical method to evaluate the performance of refrigeration oils through the bench evaluation test.

Item Details

Item Type:Refereed Article
Keywords:refrigerant oil, screw compressor, degradation, bench evaluation
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy efficiency
Objective Field:Commercial energy efficiency
UTAS Author:Wang, X (Professor Xiaolin Wang)
ID Code:134304
Year Published:2019
Deposited By:Engineering
Deposited On:2019-08-06
Last Modified:2020-01-14
Downloads:15 View Download Statistics

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