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首页> 外文期刊>日本冷凍空調学会論文集 >Effect of Chevron Angle on Condensation Heat Transfer of Refrigerants at High Pressures in Plate Heat Exchangers
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Effect of Chevron Angle on Condensation Heat Transfer of Refrigerants at High Pressures in Plate Heat Exchangers

机译：板臂角对板式热交换器高压冷凝热传递的影响

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摘要

In industrial fields, heat source over 130°C are widely needed, and for this development of industrial high-temperature heat pump systems has been promoted. For the heat release process in such the heat pump systems, the authors have studied on cooling heat transfer at supercritical pressures and condensation heat transfer at high subcritical pressures of refrigerants flowing in chevron-type plate heat exchangers (PHEs). In this study, to examine the effect of chevron angle on condensation heat transfer of refrigerants at high subcritical pressures, experiments were conducted using chevron PHEs with respective chevron angles 30°, 47.5° and 65°. In the experiments, condensation heat transfer coefficients were obtained in wide range of bulk fluid enthalpy comprising whole the saturated region, at pressures of reduced pressures from 0.65 to 0.80, and mass flow rates of 7 and 11 kg/min. The measured condensation heat transfer coefficient increased with the chevron angle. The increase rate of the condensation heat transfer coefficient against the chevron angle was compared with that of condensation heat transfer coefficient from a conventional correlation developed based on low subcritical pressures data and that of cooling heat transfer coefficient at a supercritical pressure from a previous experiment.
机译：在工业领域，广泛需要超过130°C的热源，并且为了这种工业高温热泵系统的发展已经促进。对于这种热泵系统中的热释放过程，作者已经研究了在空心的制冷剂的高亚基压力下的超临界压力和冷凝热传递的冷却热传递研究，该缩小压力在空心型板式换热器（PHES）中流动的制冷剂的高亚基压力。在本研究中，为了检查脚轮角对高亚基压力下的制冷剂的冷凝传热的影响，使用雪佛龙观点30°，47.5°和65°进行实验。在实验中，在宽范围的大量散装焓中获得缩合传热系数，其包含整个饱和区域，在减少0.65至0.80的压力下，质量流速为7和11kg / min。测量的冷凝传热系数随着字脚角增加而增加。将冷凝传热系数与脚轮角度的提高率与基于低亚临界压力数据产生的传统相关性的冷凝传热系数的增加率与来自先前实验的超临界压力下的冷却传热系数的冷却传热系数。

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