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CONDENSATION HEAT TRANSFER OF R-134a IN A HELICAL PIPE 被引量:3
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作者 HANJi-tian lincheng-xian EBADIANM.A. 《Journal of Hydrodynamics》 SCIE EI CSCD 2004年第2期144-150,共7页
Alternative refrigerant R-134a is considered to be ozone-friendly and apotential candidate for replacing the refrigerant R-12 in refrigeration and air-conditioningapplications. This paper presents an experimental inve... Alternative refrigerant R-134a is considered to be ozone-friendly and apotential candidate for replacing the refrigerant R-12 in refrigeration and air-conditioningapplications. This paper presents an experimental investigation on condensation heat transfer of thealternative refrigerant R-134a flowing inside a helicoidal pipe with the cooling water flowingthrough the annular helicoidal passage in a counter-flow direction. The heat transfer experimentswere performed for R-134a mass flow flux ranging from 100 to 420 kg/m^2 s with the superheat of theinlet vapor of 2. 8℃ and 8.3℃, respectively. The average Nusselt numbers were experimentallydetermined for a helicoidal pipe with the helix axis of vertical direction. In addition, theobtained experimental results were compared with the results for R-134a condensation in straight andhelicoidal pipes available in the open literature. 展开更多
关键词 condensation heat transfer convective condensation REFRIGERANTS helicoidalpipes
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