喷水翅片管风冷冷凝器湿外表面的测定&以垂直于冲击区的喷雾为例

Q4 Physics and Astronomy

JP Journal of Heat and Mass Transfer Pub Date : 2023-01-23 DOI:10.17654/0973576323005

I. Bop, I. Fall, B. Dieng

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引用次数: 0

摘要

在气冷式冷凝器上游喷水允许降低入口气流的温度，并在水滴撞击冷凝器外壁时获得额外的传热增益。因此，它是提高制冷系统能量性能的一种非常有效的方法。在这项工作中，基于纯几何参数，研究了一个非常适合翅片管风冷冷凝器的湿外表面预测模型。在垂直于冲击区域的喷雾情况下，润湿的外表面表示为喷嘴冷凝器参数的函数。研究发现，冷凝器的润湿外表面随着喷淋角、喷淋壁距和收集水流量的增加而增加。另一方面，当后者达到0.009kg.s-1的值时，润湿面积不再随着收集的水流而增加，并在0.07m2处变为常数。还发现，翅片管的冷凝器润湿外表面总是大于光滑管。

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DETERMINATION OF THE WETTED OUTER SURFACE OF A WATER-SPRAYED FINNED-TUBES AIR-COOLED CONDENSER: A CASE OF A SPRAY NORMAL TO THE IMPACT AREA

Spraying water upstream of an air-cooled condenser allows to reduce the temperature of the inlet air flow and to obtain additional heat transfer gains when the water droplets impinge on the condenser outer walls. It is therefore a very effective method for improving the energetic performance of refrigeration systems. In this work, a prediction model of the wetted outer surface, well suited to finned-tubes air-cooled condensers and based on purely geometric arguments, is investigated. The wetted outer surface is expressed, in case of a spray normal to the impact area, as a function of the nozzle-condenser parameters. It is found that the condenser wetted outer surface increases with the spray angle, the spray-wall distance and the collected water flow rate. On the other hand, when the latter reaches a value of 0.009kg.s-1, the wetted area no longer increases with the collected water flow and becomes a constant at 0.07m2. It is also found that the condenser wetted outer surface is always greater with finned-tubes than with smooth tubes.

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来源期刊

JP Journal of Heat and Mass Transfer Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

1.00

自引率

0.00%

发文量

期刊介绍： The JP Journal of Heat and Mass Transfer publishes peer-reviewed articles in heat and mass transfer which enriches basic ideas in this field and provides applicable tools to its users. Articles both theoretical and experimental in nature covering different aspects in the area of heat and mass transfer such as heat transfer in phase change phenomena, machinery and welding operations, porous media and turbulence are considered. Priority is given to those which employ or generate fundamental techniques useful to promote applications in different disciplines of engineering, electronics, communication systems, environmental sciences and climatology. Because a combination of two or more different technologies in a single device may result into a significant development, the journal extends its scope to include papers with the utility value in electronics and communication system. In this spirit, we are devoting certain number of issues to ‘Mechanical Systems and ICT – Convergence’. Survey articles dealing with certain issues in the context of current developments in heat and mass transfer together with their applications in interdisciplinary topics are also entertained.