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	Experimental investigation on condensation heat transfer of R22 and R410a in microtubes
	Zhang Huiyong ; Li Junming ; Wang Buxuan
	2010-10-12 ; 2010-10-12
关键词	Practical Theoretical or Mathematical Experimental/ condensation heat transfer microchannel flow pipe flow refrigerants/ R410a condensing process R22 condensation heat transfer equipments stainless round tube mass flux vapor quality heat transfer coefficients/ A4785 Applied fluid mechanics A4725Q Convection and heat transfer A4760 Flows in ducts, channels, and conduits E2120 Heat and thermodynamic processes (mechanical engineering) E2160 Micromechanics (mechanical engineering) E2130 Fluid mechanics and aerodynamics (mechanical engineering) E1710 Engineering materials
中文摘要	R410a is known as one of the substitutes of R22. Studying the pressure drop of R410a during condensing process is important for designing high efficient condensation heat transfer equipments using R410a as refrigerant. Test rig for condensation heat transfer in micro-scale is established and condensation heat transfer coefficients of R22 and R410a in stainless round tube with the inner diameter of 0.941 mm are measured at a saturate temperature of 40 degrees C, with mass flux varying from 200-1000 kg/(m/sup 2/ middot s), over the quality 0.2-0.8. The effects of mass flux and vapor quality were analyzed and present experiment data were compared with SHAH (1979) correlation and AKERS(1959) correlation which are based on experiment data from conventional tubes and widely used. The experimental and analytical results showed that condensation heat transfer coefficients increased with mass flux and vapor quality and obviously faster in high vapor quality region, which indicated that vapor shear force played more important role. The two correlations both can't predict present experiment data accurately especially in high vapor quality region with the biggest error of 60%. Condensation heat transfer coefficients of R410a are lower than that of R22 at low mass flux and vapor quality but nearly equivalent at intermediate or more higher mass flux.
语种	中文
出版者	Chinese Journal of Mechanical Engineering ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79971]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang Huiyong,Li Junming,Wang Buxuan. Experimental investigation on condensation heat transfer of R22 and R410a in microtubes[J],2010, 2010.
APA	Zhang Huiyong,Li Junming,&Wang Buxuan.(2010).Experimental investigation on condensation heat transfer of R22 and R410a in microtubes..
MLA	Zhang Huiyong,et al."Experimental investigation on condensation heat transfer of R22 and R410a in microtubes".(2010).

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