Study on performance change in a linear compressor considering refrigerant leakage through the suction valve clearance
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Leakage of refrigerant in a linear compressor is one of the main factors affecting compressor performance. The refrigerant leakage mainly occurs due to piston clearance or valve clearance. Valve clearance leakage has been studied [1, 2]. However, as in the present study, there is no research that accurately predicts the performance of a compressor using CFD while considering the valve clearance of a linear compressor. Therefore, in this study, the valve clearance leakage was experimentally measured according to the compression chamber pressure and a 3 - dimensional CFD cycle analysis was performed considering the valve clearance leakage. It was found that the actual clearance of the suction valve corresponds to about 2 ∼ 4 μm. According to the cycle analysis, when the valve clearance decreases from 5 μm to 3 μm, the cooling capacity increases by about 5 % and the EER increases by 6 %. Furthermore, considering leakage due to valve clearance, the simulated valve opening period and the valve vibration at closing were more in agreement with the experiment.
KeywordsLinear compressor Suction valve leakage Suction valve clearance Reed valve CFD analysis
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This research was supported by a research grant of the Kongju National University in 2018.
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