空调常用制冷剂在微通道蒸发器中的性能分析

Performance Analysis of Air Conditioning Refrigerants Applied to Micro-channel Evaporator

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 opti-mized software. The heat transfer and pressure drop performance analysis of micro-channel evaporator for R22, R290 （propane）, R134a, R410A and R1234yf are presented by using suitable heat transfer and pres-sure drop correlations. Results show that, under the same mass flow rate condition, the heat exchange ca-pacity of R290 is the maximum, which is better than that of R22 by up to 63%, the heat exchange capacity of R410A is nearly same as R22, the heat exchange capacity of R1234yf is the minimum; the charge of R290 is the minimum, which is only 72.4% of R22, the charge of R134a is the maximum up to 221 g; but the press drop of R290 is also the maximum that up to 75.4 kPa. Under the same theoretically heat ex-change capacity and the different mass flow rate condition,the heat exchange capacity of R134a is the max-imum that up to 8500 W, the charge and press drop of R290 is the minimum, and its heat exchange ca-pacity is up to 8230.4 W.