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- Title
油循环率对蒸发器内传热与工质流动的影响.
- Authors
李兆华; 赵俊杰; 沈 浩; 鲍 鑫; 周 航; 左 吉
- Abstract
A leakage of oil lubricants affects the heat transfer and flow of refrigerants in vapor compression refrigeration (VCR) systems. In this study, a numerical model of a VCR system using a linear compressor and R1234yf as the refrigerant was developed. The proposed model was validated in terms of pressure drop and cooling capacity through experimental tests under oil-free conditions using a VCR system with an oil-free linear compressor. The mean absolute percentage error of the cooling capacity and pressure drop were 3. 9% and 8. 2%, respectively. The results showed that the discharge temperature wasinversely proportional to the evaporating temperature and the oil circulation ratio (ORC). The cooling capacitiesunder oil-free conditionswere 4% and 22% higher than those at 2% and 6% oil circulation ratio (OCR), respectively, at a condensing temperature of 50 ℃ and evaporating temperature of 2 ℃in the VCR system. The pressure drop under oil-free and 4% OCR conditions were 6. 17 kPa and 9. 92 kPa, respectively, at a condensing temperature of 50 ℃ and an evaporating temperature of -11 ℃. The pressure drop of the oil-containing system was 5%-82% higher than that of the oil-free system, and the pressure drop in the heat exchanger increased with an increase in the oil circulation ratio.
- Publication
Journal of Refrigeration, 2023, Vol 44, Issue 3, p119
- ISSN
0253-4339
- Publication type
Article
- DOI
10.3969/j.issn.0253-4339.2023.03.119