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现行 3807(RP-676)
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Shell-Side Condensation Heat Transfer of R-134a -- Part 2: Enhanced Tube Performance R-134a壳程冷凝传热第2部分:强化管性能
给出了制冷剂R134a在两种不同强化几何结构的管束上冷凝时的壳程传热系数数据。测试的管束为五排宽五排深,交错排列,水平节距为22.2mm(0.875 in.)垂直间距为19.1毫米(0.75英寸)。这些数据是在35℃(95℉)的制冷剂饱和温度下,在18000到40000 W/m2(5700到12700 Btu/[hÃ151; ft2])的管束热通量范围内获得的。计算了管束的平均冷凝传热系数以及每排中间管的平均冷凝传热系数。 数据显示,Tu-Cii管的性能明显优于G-SC管。两个管束之间的排间传热系数行为也不同。总的来说,平均管束和平均排传热系数随热流密度的增加而减小。Tu Cii的性能也优于之前测试的每英寸40个翅片(fpi)和26个fpi管,而G-SC的性能仅优于26个fpi管。关键词:管壳式冷凝器、冷凝、传热系数、制冷剂、R134a、翅片管、性能、热流、饱和温度、实验、测试、比较引用: ASHRAE Trans。1994年,第100卷,第2部分,论文编号3807(RP-676),248-256,图12。,2个标签。,参考文献3。
Shell-side heat transfer coefficient data are presented for the condensation of refrigerant R134a on tube bundles constructed from two different enhanced geometries. The tube bundles tested are five rows wide by five rows deep and have a staggered tube arrangement with a horizontal pitch of 22.2mm (0.875 in.) and a vertical pitch of 19.1mm (0.75 in.). The data were obtained at a refrigerant saturation temperature of 35 deg C (95 deg F) over a bundle heat flux range of 18,000 to 40,000 W/m2(5,700 to 12,700 Btu/[h×ft2] ). Average condensing heat transfer coefficients for the bundle as well as average condensing heat transfer coefficients for the middle tube of each row were calculated. The data show that the Tu-Cii tube performs significantly better than the G-SC tube. The row-to-row heat transfer coefficient behaviour also differs between the two tube bundles. In general, the average bundle and average row heat transfer coefficients decrease with increasing heat flux. The Tu-Cii also performs better than the previously tested 40-fins-per-inch (fpi) and 26-fpi tubes, while the G-SC only performs better than the 26-fpi tube.KEYWORDS: shell and tube condensers, condensation, heat transfer coefficient, refrigerants, R134a, finned tubes, performance, heat flow, saturation temperature, experiment, testing, comparing
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