Analysis of oil-free linear compressor operated at high pressure ratios for household refrigeration
Analysis of oil-free linear compressor operated at high pressure ratios for household refrigeration
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DOI：
10.1016/j.energy.2018.03.068
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发表时间：
2018-05
期刊：
影响因子：
9
通讯作者：
K. Liang
中科院分区：
文献类型：
--
作者：
K. Liang
与传统的用于蒸汽压缩制冷（VCR）系统的往复式压缩机相比，直线压缩机具有更高的能效和无油运行，因此可以使用小型/微通道换热器。然而，当无油线性压缩机用于具有典型的高压比（10以上）的家用制冷时，存在关键挑战，例如高间隙损失、高活塞偏移和非常非线性的气弹簧。作者以前的论文已经证明了无油线性压缩机在低压比（低于3.5）下用于电子冷却的可行性。本文对这些问题进行了全面的分析，为开发家用制冷用无油润滑直线压缩机迈出了关键的一步。通过对一台最小流量线性压缩机样机的测量，验证了高压比下非线性气弹簧模型的正确性。在1Hz时，电磁阀可以有效地控制活塞偏移。如果活塞在气缸中完全偏心，则气体泄漏增加2.5倍。当压比为13.6时，R600 a燃气泄漏损失为输入功率的27%。
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.