Analysis of oil-free linear compressor operated at high pressure ratios for household refrigeration

Liang, Kun (2018) Analysis of oil-free linear compressor operated at high pressure ratios for household refrigeration. Energy, 151. pp. 324-331. ISSN 0360-5442

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Compared with conventional reciprocating compressor for vapour compression refrigeration (VCR) system, linear compressor offers higher energy efficiency and oil-free operation, which allows the use of mini/micro-channel heat exchangers. However, there are key challenges when oil-free linear compressors are used for household refrigeration with typical high pressure ratios (above 10), such as high clearance loss, high piston offset, and very nonlinear gas spring. Previous papers by the author have demonstrated the feasibility of oil-free linear compressor for electronics cooling at lower pressure ratios (below 3.5). This paper presented comprehensive analysis of these issues as a key step towards developing oil-free linear compressor for household refrigeration. The model of non-linear gas spring at high pressure ratios is validated by measurements of a previous prototype linear compressor with minimum flow. Piston offset can be effectively controlled by solenoid valve at 1 Hz. Gas leakage increases by a factor of 2.5 if the piston is fully eccentric in the cylinder. The gas leakage loss can be 27% of power input for pressure ratio of 13.6 using R600a.

Item Type: Article
Keywords: linear compressor, household refrigeration, resonant frequency, gas spring, gas leakage, high pressure ratio
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
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Depositing User: Kun Liang
Date Deposited: 14 Mar 2018 11:10
Last Modified: 04 Jul 2018 11:02

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