碳氢化合物及其混合物应用于小型商业冷柜的实验研究

摘要

To solve the environment issue of the refrigerant applied in low temperature cabinet freezers, the study was performed on the alternative refrigerants of R404A, such as hydrocarbons. A FORTRAN program for refrigeration cycle was proposed to obtain the thermodynamic cycle performance of R404A, R290, R290/DME (wt%: 80/20) and R290/R134A (wt%: 50/50) under low-temperature conditions. The optimal refrigerant charge amount and cooling rate of a SRL-CD2075HA commercial cabinet freezer were experimentally investigated The results show that the COP of R290, R290/DME (wt%: 80/20) and R290/R134A (wt%: 50/50) are better than that of R404A. Moreover, the power consumption is also lower. In addition, the optimal charge amount of R404A, R290, R290/DME (wt%: 80/20) and R290/R134A (wt%: 50/50) are about 600 g, 250 g, 235 g and 440 g, respectively. R290 and its binary refrigerant blends can achieve the same cooling effect of R404A under the same conditions.%为了解决目前应用于低温冷柜的制冷剂环保问题，本文对碳氢化合物应用于低温冷柜以替代R404A 等传统的低温制冷剂进行了研究。本文编写了制冷剂循环性能程序，比较了 R404A、R290、R290/DME（wt%：80/20）和 R290/R134A（wt%：50/50）在低温工况下的热力学循环性能。基于商业冷柜SRL-CD2075HA，实验研究了R290及其二元混合物的最佳冲灌量和降温速度。结果表明：R290、R290/DME （wt%：80/20）和 R290/R134A（wt%：50/50）的循环性能系数优于 R404A，其系统耗功也比 R404A 系统低；R404A、R290、R290/DME（wt%：80/20）和R290/R134A（wt%：50/50）的最优充灌量分别为600 g、250 g、235 g和440 g。在同等条件下，R290及其二元混合工质完全可以达到R404A的制冷效果。