An Analysis of Performance for Applying R290 and R290/R170 to a Dual-temperature Refrigeration System
The study investigates the effectiveness of substituting R404A refrigerant with the more environmentally friendly hydrocarbon refrigerants R290 and Minus50 (R290/R170) in a commercial dual-temperature refrigerating and freezing storage unit.A series of discussions and analyses were performed using varying quantities of refrigerant fillings and with various system loads.Temperature expansive valves and a concentric tube-based supercooling heat exchanger were used in the dual-temperature refrigeration system to compare performance when the system had no load, a 150 W fixed load, and a dynamic load of 18 kg of water.The discrepancies between the results for cooling efficiency, consumption power, system work input, and coefficients of performance (COP) and actual measurement data were examined.The results indicated that the cooling rate of the hydrocarbon refrigerants R290 and Minus50 were superior to R404A, regardless of whether the system was operating with or without a load, and that the power consumptions were approximately 11% and 28% lower, respectively, than that of the R404A;the specific volume of the R404A was approximately 33% that of the hydrocarbon refrigerants R290 and Minus50.Consequently, the R404A had the least compressor work input among the three refrigerants.This study calculated that the energy factor (EF;i.e., the refrigerator performance benchmark) of the unit was 3.52 when using the R404A, 4.04 using R290, and 4.76 using Minus50.
R290 hydrocarbon refrigerant energy factor (EF) dual-temperature refrigeration system
Mingwei Lin Chingsong Jwo Hungpin Jwo Shanghuang Chiu Sihli Chen
Department of Energy and Refrigerating Air Conditioning Engineering, National Taipei University of T Department of Mechanical Engineering, National Taipei University
国内会议
江苏省颗粒学会2014年学术年会暨江苏省化工环保技术2014研讨会
南京
英文
387-397
2014-10-17（万方平台首次上网日期，不代表论文的发表时间）