Characteristics of refrigerant hold-up and heat transfer performance of falling film condenser under refrigerating condition

doi:10.11949/j.issn.0438-1157.20150405

CIESC Journal ›› 2015, Vol. 66 ›› Issue (12): 5012-5021.DOI: 10.11949/j.issn.0438-1157.20150405

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Characteristics of refrigerant hold-up and heat transfer performance of falling film condenser under refrigerating condition

ZHANG Fayong¹, LIU Jinping^1,2, XU Xiongwen¹

1 School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China;
2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2015-03-31 Revised:2015-07-01 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by State Key Laboratory of Subtropical Building Science (2015ZC13) and Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (2013A061401005).

制冷工况下降膜冷凝器的制冷剂积存特性与传热性能

张发勇¹, 刘金平^1,2, 许雄文¹

1 华南理工大学电力学院, 广东广州 510640;
2 华南理工大学亚热带建筑科学国家重点实验室, 广东广州 510640

通讯作者: 刘金平
基金资助:
华南理工大学亚热带建筑科学国家重点实验室基金项目(2015ZC13);广东省能源高效清洁利用重点实验室(华南理工大学)基金项目(2013A061401005)。

Abstract

Abstract:

In order to reduce the refrigerant charging quantity while maintaining the performance of an air conditioner, the refrigerant hold-up in the condenser of a domestic air conditioner is experimentally studied. The results indicate that more than 60% of the total refrigerant charging quantity is in the condenser, since the liquid-phase hold-up in the two-phase and subcooled regions is relatively large. Therefore, a finned tube falling film condenser is proposed and employed since vertical tubes can decrease the refrigerant hold-up. Consequently, the total refrigerant charging quantity is reduced from 1050 g to 550 g while the system performance maintains stable.

Key words: falling film, two-phase flow, heat transfer, condensation, refrigerant charging quantity

摘要：

为探索在保证空调器性能的同时,减少制冷剂充注量的解决方案,对家用分体空调室外机的制冷剂积存量进行了实验研究,结果表明:冷凝器中两相段及过冷段的液相积存量较大,导致冷凝器内积存的制冷剂质量较多,占总充灌量的60%以上。故利用竖直管降膜冷凝来减少制冷剂积存量的思路,设计了翅片管降膜冷凝器并对其进行了实验研究,结果表明:在保证系统性能的同时,总充灌量由1050 g减少到550 g。

关键词: 降膜, 两相流, 传热, 凝结, 充灌量

CLC Number:

TK172.4

ZHANG Fayong, LIU Jinping, XU Xiongwen. Characteristics of refrigerant hold-up and heat transfer performance of falling film condenser under refrigerating condition[J]. CIESC Journal, 2015, 66(12): 5012-5021.

张发勇, 刘金平, 许雄文. 制冷工况下降膜冷凝器的制冷剂积存特性与传热性能[J]. 化工学报, 2015, 66(12): 5012-5021.

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Characteristics of refrigerant hold-up and heat transfer performance of falling film condenser under refrigerating condition

制冷工况下降膜冷凝器的制冷剂积存特性与传热性能

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