空调常用制冷剂在微通道蒸发器中的性能分析
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摘要
通过换热器优化软件设计了一款微通道平行流蒸发器模型,利用已验证的传热与压降关联式,在不同的模拟工况下研究分析了R22、R290(propane)、R134a、R410A、R1234yf在蒸发器模型中的传热与流动性能。结果表明:在质量流量一定的条件下,R290的换热量远高于其他制冷剂,是R22的1.63倍,R410A的换热量与R22相差无几,换热量最小的制冷剂为R1234yf;R290的充注量为147 g,仅为R22的72.4%,R134a的充注量最大,达到了221 g;制冷剂侧压降损失最大的R290,压降损失达到了75.4 k Pa。在理论换热量一定、质量流量不定的条件下,换热量最大的制冷剂是R134a,达到了8 500 W;充注量和制冷剂侧压降损失最小的制冷剂为R290,并且其换热量达到了8 230.4 W。
A micro-channel parallel flow evaporator model is designed by a heat exchanger optimized software.The heat transfer and pressure drop performance analysis of micro-channel evaporator for R22,R290(propane),R134 a,R410 A and R1234 yf are presented by using suitable heat transfer and pressure drop correlations.Results show that,under the same mass flow rate condition,the heat exchange capacity of R290 is the maximum,which is better than that of R22 by up to 63%,the heat exchange capacity of R410 A is nearly same as R22,the heat exchange capacity of R1234 yf is the minimum;the charge of R290 is the minimum,which is only 72.4% of R22,the charge of R134 a is the maximum up to 221 g;but the press drop of R290 is also the maximum that up to 75.4 k Pa.Under the same theoretically heat exchange capacity and the different mass flow rate condition,the heat exchange capacity of R134 a is the maximum that up to 8 500 W,the charge and press drop of R290 is the minimum,and its heat exchange capacity is up to 8 230.4 W.
A micro-channel parallel flow evaporator model is designed by a heat exchanger optimized software.The heat transfer and pressure drop performance analysis of micro-channel evaporator for R22,R290(propane),R134 a,R410 A and R1234 yf are presented by using suitable heat transfer and pressure drop correlations.Results show that,under the same mass flow rate condition,the heat exchange capacity of R290 is the maximum,which is better than that of R22 by up to 63%,the heat exchange capacity of R410 A is nearly same as R22,the heat exchange capacity of R1234 yf is the minimum;the charge of R290 is the minimum,which is only 72.4% of R22,the charge of R134 a is the maximum up to 221 g;but the press drop of R290 is also the maximum that up to 75.4 k Pa.Under the same theoretically heat exchange capacity and the different mass flow rate condition,the heat exchange capacity of R134 a is the maximum that up to 8 500 W,the charge and press drop of R290 is the minimum,and its heat exchange capacity is up to 8 230.4 W.
引文
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[13]王启川.热交换设计[M].台湾:五南图书出版股份有限公司,2007:115-121.
[14]C Y Yang,R L Webb.Condensation of R12 in small hydraulic diameter extruded aluminum tubes with and without microfin[J].International Journal of Heat Mass Transfer,1996,39(4):791-800.
[15]F W Dittus,L M K Boelter.Heat transfer in automobile radiators of the tubular type[J].International Communication of Heat and Mass Transfer,1985,12(1):3-22.
[16]M B Ould Didi,N Kattan,J R Thome.Prediction of two phase pressure gradients of refrigerants in horizontal tubes[J].International Journal of Refrigeration,2002,25(7):935-947.
[2]赵宇,祁照岗,陈江平.微通道平行流蒸发器流程布置研究与分析[J].制冷学报,2009,30(1):25-29.
[3]肖庭庭,李征涛,陈坤.R290替换R22应用于家用空调的试验研究[J].流体机械,2014,43(3):67-70.
[4]王颖,徐博,陈江平,等.微通道换热器用于家用柜机空调时整机性能的对比实验研究[J].制冷学报,2015,36(1):24-29.
[5]Qiqi Tian,Dehua Cai,Liang Ren,et al.An experimental investigation of refrigerant mixture R32/R290 as drop-in replacement for HFC410A in household air conditioners[J].International Journal of Refrigeration,2015,57:216-228.
[6]JH Wu,LD Yang,J Hou.Experimental performance study of a small wall room air conditioner retrofitted with R290 and R1270[J].International journal of Refrigeration,2012,35:1860-1868.
[7]梁媛媛,赵宇,陈江平.微通道平行流蒸发器仿真模型[J].上海交通大学学报,2013,47(3):413-416.
[8]严瑞东,徐博,陈江平,等.微通道换热器两相分配特性对空调系统性能的影响[J].制冷学报,2013,34(3):21-23.
[9]刘巍,朱春玲.内部结构对微通道平行流蒸发器性能的影响[J].南京航空航天大学学报,2012,44(6):893-897.
[10]Rin Yun,Yongchan Kim,Chasik Park.Numerical analysis on a microchannel evaporator designed for CO2air-conditioning systems[J].Applied Thermal Engineering,2007,27:1320-1326.
[11]Chang Y J,Wang C C.A generalized heat transfer correlation for louver fin geometry[J].International Journal of Heat and Mass Transfer,1997,40(3):533-544.
[12]Yu-Juei Chang,Wen-Jeng Chang,Ming-Chia Li,et al.An amendment of the generalized friction correlation for louver fin geometry[J].International Journal of Heat and Mass Transfer,2006,49:4250-4253.
[13]王启川.热交换设计[M].台湾:五南图书出版股份有限公司,2007:115-121.
[14]C Y Yang,R L Webb.Condensation of R12 in small hydraulic diameter extruded aluminum tubes with and without microfin[J].International Journal of Heat Mass Transfer,1996,39(4):791-800.
[15]F W Dittus,L M K Boelter.Heat transfer in automobile radiators of the tubular type[J].International Communication of Heat and Mass Transfer,1985,12(1):3-22.
[16]M B Ould Didi,N Kattan,J R Thome.Prediction of two phase pressure gradients of refrigerants in horizontal tubes[J].International Journal of Refrigeration,2002,25(7):935-947.