Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture
R32 is widely used in room air-conditioners, with heat-transfer characteristics affected by the intermiscibility of the oil. Therefore, it is necessary to determine the optimal intermiscibility of the oil to improve heat transfer characteristics. This study investigated the influence of stratificati...
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Journal of Refrigeration Magazines Agency Co., Ltd.
2023-01-01
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| Series: | Zhileng xuebao |
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| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2023.05.070 |
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| author | Li Guang Zhuang Dawei Xie Liyi Ding Guoliang Hu Guoxin Zheng Liyu Liao Siqing Lu Yaoshan Kan Wang Long Chunxian |
| author_facet | Li Guang Zhuang Dawei Xie Liyi Ding Guoliang Hu Guoxin Zheng Liyu Liao Siqing Lu Yaoshan Kan Wang Long Chunxian |
| author_sort | Li Guang |
| collection | DOAJ |
| description | R32 is widely used in room air-conditioners, with heat-transfer characteristics affected by the intermiscibility of the oil. Therefore, it is necessary to determine the optimal intermiscibility of the oil to improve heat transfer characteristics. This study investigated the influence of stratification, caused by the intermiscibility of the R32-oil mixture, on the heat transfer characteristics. The flow boiling heat transfer coefficient and pressure drop of a completely miscible R32-oil mixture, a partially miscible R32-oil mixture, and a completely immiscible R32-oil mixture were tested experimentally. To cover the working conditions of air conditioners and reflect the different intermiscibilities of the R32-oil mixtures, the test conditions included evaporating temperatures from -5 ℃ to 15 ℃, vapor quality from 0.2 to 0.7, and averaged oil concentrations of 1% and 5%. The results showed that partially miscible oil had the highest heat transfer coefficient and the lowest pressure drop; at an evaporating temperature of 5 ℃, vapor quality of 0.7, and averaged oil concentration of 5%, the advantage of a partially miscible R32-oil mixture over that of the completely miscible and completely immiscible mixtures increased. The maximum increases in heat transfer coefficient were 36.8% and 357.8%, and the maximum decreases in pressure drop were 9.0% and 58.2%, respectively. Among the three types of oils, the partially miscible oil exhibited the best heat transfer and pressure drop characteristics and thus has the best application prospects. |
| format | Article |
| id | doaj-art-0eef20bcbddd4aa89cf5bdfb54450e62 |
| institution | DOAJ |
| issn | 0253-4339 |
| language | zho |
| publishDate | 2023-01-01 |
| publisher | Journal of Refrigeration Magazines Agency Co., Ltd. |
| record_format | Article |
| series | Zhileng xuebao |
| spelling | doaj-art-0eef20bcbddd4aa89cf5bdfb54450e622025-08-20T03:15:53ZzhoJournal of Refrigeration Magazines Agency Co., Ltd.Zhileng xuebao0253-43392023-01-014466500941Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil MixtureLi GuangZhuang DaweiXie LiyiDing GuoliangHu GuoxinZheng LiyuLiao SiqingLu YaoshanKan WangLong ChunxianR32 is widely used in room air-conditioners, with heat-transfer characteristics affected by the intermiscibility of the oil. Therefore, it is necessary to determine the optimal intermiscibility of the oil to improve heat transfer characteristics. This study investigated the influence of stratification, caused by the intermiscibility of the R32-oil mixture, on the heat transfer characteristics. The flow boiling heat transfer coefficient and pressure drop of a completely miscible R32-oil mixture, a partially miscible R32-oil mixture, and a completely immiscible R32-oil mixture were tested experimentally. To cover the working conditions of air conditioners and reflect the different intermiscibilities of the R32-oil mixtures, the test conditions included evaporating temperatures from -5 ℃ to 15 ℃, vapor quality from 0.2 to 0.7, and averaged oil concentrations of 1% and 5%. The results showed that partially miscible oil had the highest heat transfer coefficient and the lowest pressure drop; at an evaporating temperature of 5 ℃, vapor quality of 0.7, and averaged oil concentration of 5%, the advantage of a partially miscible R32-oil mixture over that of the completely miscible and completely immiscible mixtures increased. The maximum increases in heat transfer coefficient were 36.8% and 357.8%, and the maximum decreases in pressure drop were 9.0% and 58.2%, respectively. Among the three types of oils, the partially miscible oil exhibited the best heat transfer and pressure drop characteristics and thus has the best application prospects.http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2023.05.070R32lubricating oilintermiscibilityflow boilingheat transfer coefficient |
| spellingShingle | Li Guang Zhuang Dawei Xie Liyi Ding Guoliang Hu Guoxin Zheng Liyu Liao Siqing Lu Yaoshan Kan Wang Long Chunxian Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture Zhileng xuebao R32 lubricating oil intermiscibility flow boiling heat transfer coefficient |
| title | Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture |
| title_full | Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture |
| title_fullStr | Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture |
| title_full_unstemmed | Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture |
| title_short | Effect of Intermiscibility on Internal Flow Boiling Heat Transfer and Pressure Drop Characteristics of R32-Oil Mixture |
| title_sort | effect of intermiscibility on internal flow boiling heat transfer and pressure drop characteristics of r32 oil mixture |
| topic | R32 lubricating oil intermiscibility flow boiling heat transfer coefficient |
| url | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2023.05.070 |
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