Experimental investigation of condensation heat transfer of refrigerant R-134A in helicoidal pipes

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作者：
Han, J.T. [1 ]
Lin, C.X. [1 ]
Ebadian, M.A. [1 ]
机构：
[1] Hemispheric Ctr. Environ. Technol., Florida International University, 10555 West Flagler Street, Miami, FL 33174, United States
来源：
American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD | 2000年 / 366卷
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摘要：
Alternative refrigerant R-134a is considered to be ozone-friendly and a potential candidate for replacing the refrigerant CFC-12 in refrigeration and air-conditioning applications. This paper presents the experimental investigation of condensation heat transfer characteristics of superheated R-134a vapor flowing inside helicoidal pipes with the cooling water flowing through the annular helicoidal passage in a counter-flow direction. The heat transfer experiment was performed for R-134a mass flow flux ranging from 100 to 420 kg/m2s with the superheat of the inlet vapor of 2.8°C and 8.3°C, respectively. The cooling water flow Reynolds Rew ranges from 1500 to 12000. The Nusselt numbers were experimentally determined for a helicoidal pipe with the helix axis of vertical direction. The correlations for Nusselt numbers are developed based on the experimental results, which can be used as a reference in the design of helicoidal pipe condensers.
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页码：95 / 100
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