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首页> 外文期刊>Mechanical Engineering Journal >Cooling and condensation heat transfer and pressure drop of a refrigerant at high pressures in a chevron-type plate heat exchanger with high chevron angle
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Cooling and condensation heat transfer and pressure drop of a refrigerant at high pressures in a chevron-type plate heat exchanger with high chevron angle

机译：具有高脚轮角度的空心型板式换热器高压下冷却和冷凝热传递和制冷剂的压降

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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, it is considered to use of a plate heat exchanger (PHE) in which a high pressure working refrigerant flows. In this study, to examine the effect of chevron angle on heat transfer of refrigerants flowing in chevron PHEs at supercritical pressure and high subcritical pressure, experiments were conducted using a chevron PHE with a chevron angle 75°. The measured heat transfer coefficient was compared with the data of three chevron PHEs with respective chevron angles 30°, 47.5° and 65° obtained previously. The effect of chevron angle on heat transfer at 65° and more was smaller than that at less than 65°, and the heat transfer coefficient in 75° PHE was almost the same with that in 65° PHE, considering difference in hydraulic diameter between the PHEs. Furthermore, the value of heat transfer coefficient achieved in 65° or 75° PHE was estimated to be almost maximum between 0° to 90°. On the other hand, the friction factor of 75° PHE was markedly larger than that of 65° PHE.
机译：在工业领域，广泛需要130°C超过130°C的热源，对于该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，它被认为使用具有高压工作制冷剂流动的板式热交换器（PHE）。在这项研究中，为了检查脚轮角度在超临界压力和高亚临界压力下流动的制冷剂的传热和高亚基压力的效果，使用具有脚轮角度75°的雪臂PHE进行实验。将测量的传热系数与三个脚轮测量的数据进行比较，其中先前获得的各个脚轮角度为30°，47.5°和65°。脚轮角在65°的热传递的影响小于小于65°的热传递，并且75°PHE中的热传递系数与65°PHE的热传递系数几乎相同，考虑到液压直径之间的差异phes。此外，在65°或75°PHE中实现的传热系数的值估计在0°至90°之间几乎最大。另一方面，75°PHE的摩擦系数明显大于65°PHE。

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