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

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  • Liang, Kun

Abstract

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 non-linear 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.

Suggested Citation

  • Liang, Kun, 2018. "Analysis of oil-free linear compressor operated at high pressure ratios for household refrigeration," Energy, Elsevier, vol. 151(C), pages 324-331.
    • Handle: RePEc:eee:energy:v:151:y:2018:i:c:p:324-331
    DOI: 10.1016/j.energy.2018.03.068
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    References listed on IDEAS

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    1. Liang, Kun & Stone, Richard & Davies, Gareth & Dadd, Mike & Bailey, Paul, 2014. "Modelling and measurement of a moving magnet linear compressor performance," Energy, Elsevier, vol. 66(C), pages 487-495.
    2. Azmi, W.H. & Sharif, M.Z. & Yusof, T.M. & Mamat, Rizalman & Redhwan, A.A.M., 2017. "Potential of nanorefrigerant and nanolubricant on energy saving in refrigeration system – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 415-428.
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    Cited by:

    1. Li, Chengzhan & Sun, Jian & Zou, Huiming & Cai, Jinghui & Zhu, Tingting, 2023. "Characteristic analysis and energy efficiency of an oil-free dual-piston linear compressor for household refrigeration with various conditions," Energy, Elsevier, vol. 270(C).

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