Theoretical study of R32 in an oil flooded compression cycle with a scroll machine |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle NE1 7RU, UK;1. R&D Center of Doowon Heavy Industrial Co., Ltd., 678 Jangwon-Ri, Juksan-Myon, Anseong-Si, Kyeonggi-Do, Republic of Korea;2. Department of Building Engineering Services, Doowon Technical University College, 678 Jangwon-Ri, Juksan-Myon, Anseong-Si, Kyeonggi-Do, Republic of Korea;3. Department of Computer Aided Design, Doowon Technical University College, 678 Jangwon-Ri, Juksan-Myon, Anseong-Si, Kyeonggi-Do, Republic of Korea;4. School of Mechanical Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Ku, Seoul, 120-749, Republic of Korea;1. Emerson Climate Technologies, Rue des Trois Bourdons 27, 4840, Welkenraedt, Belgium;2. Emerson Climate Technologies, Pascalstraβe 65, 52076, Aachen, Germany;3. Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4, 20156, Milano, Italy;1. Department of Mechanical Engineering, Korea University, Anam-Ro, Sungbuk-Ku, Seoul, 136-701, Republic of Korea;2. R&D Team, Digital Appliances, Samsung Electronics Co., Ltd., Suwon-Si, Gyeonggi-Do 443-742, Republic of Korea |
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| Abstract: | R32 is regarded as a potential alternative for R410A, but it has a low slope of isentropic line, high superheat inside a compressor and thus a high discharge temperature. These disadvantages limit its wider adoption. In order to improve the performance of R32 air conditioner, oil flooded compression with regenerator has been suggested. A single stage oil flooded compressor model is developed to obtain a more accurate system-level improvement. In the compressor model, the heat transfer losses between shell and ambient, suction gas and motor, and high-pressure and low-pressure cylinders are considered. By means of parametric studies, it was found that the novel cycle resulted to be beneficial to increase the compressor internal superheating, to decrease the compressor heat losses and to improve its overall isentropic efficiency while cooling capacity or heating capacity is degraded. COPh improvement can reach up to 16.4% for an evaporating and condensing temperatures of ?25 °C and 45 °C, respectively. The discharge temperature resulted to be lower than 110 °C. In addition, a thorough comparison between R32 and R410A with both novel and baseline systems has been carried out. The results indicate that the novel cycle has potential benefits for applications in R32 air conditioners. |
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