采用微通道冷凝器的无霜风冷冰箱系统性能提升

Optimal Performance Research of Frost-free Air-cooled Refrigerator with Microchannel Condenser

随着《家用电冰箱耗电量限定值及能效等级》(GB 12021.2—2015)的实施,本文将微通道换热器(MPE)引入无霜风冷冰箱,采用由部件单体到系统整体的技术路线,实验研究了无霜风冷冰箱系统中的4种典型的微通道冷凝器样件,并与原机冷凝器进行了单体性能对比测试。结果表明:最优样件的换热性能提升13%,其空气侧压降为原机的28%,制冷剂侧压降为原机的54%。将最优样件引入冰箱系统并优化了系统的充注量,按照新标准GB/T8059—2016的要求对新系统进行了标准耗电量测试,结果表明:当测试工况为25℃时,系统耗电量较原系统下降了2.8%,新国标系统折算耗电量较原机下降了2.6%,达到了新国标1级的要求。

With implementation of the Maximum Allowable Values of The Energy Consumption And Energy Efficiency Grade For Household Refrigerators（ GB 12021.2--2015 ）, this study experimentally investigated the application of four typical kinds of microchannel heat exchangers （MPE） on domestic refrigerator system. The investigation was conducted from component to system, and heat exchanger performance was compared with original condenser. The results show that for the best MPE sample, the heat transfer performance can increase by 13% , the air-side pressure drop is only 28% , and the refrigerant-side pressure drop is only 54%. The best MPE sample was introduced into a refrigerator system, and the charge of refrigerant for the system was optimized. The optimized system energy consumption was tested under national standard GB/TS059-2016. The results show that the energy consumption of the new system was 2. 8% lower than the original under a test condition of 25 ℃, and the calculated energy consumption based on the new national standard was 2. 6% lower than the original. This can meet the first-class requirements of the new national standard.