In this research, the performance of serial two-stage compression (STC) cycle and bypass two-stage compression (BTC) cycle on the household refrigerator-freezers is tested in the laboratory. Then, based on the results of the experiments, exergy, exergoeconomic analyses, and cycle optimization are carried out. Considering that replacing refrigerants in household refrigerator-freezers is one of the approaches to increase the performance and environmental impact of these systems, R436A refrigerant (46% Isobutene and 54% Propane mixture) is used and analyzed to replace previous refrigerants. Finally, the multi-objective optimization of the mentioned cycles is performed with both refrigerants. For analyses, two models of refrigerator-freezers with different cycles are used (STC cycle with R134a refrigerant and BTC cycle with R-600a refrigerant). In both models, two evaporators for refrigerator-freezer compartments are used. International standards (IEC 62552) are used to test refrigerator-freezers. MATLAB and REFPROP 9.1 software are used to model the systems. According to the results of the analyses, the STC cycle with R436A refrigerant has more total exergy destruction rate (0.727 kW) compared to R134a refrigerant. In the BTC cycle, in which the fresh food compartment (FFC) and freezer compartment (FZC) operate, the total exergy destruction rate with R-600a refrigerant (0.422 kW) is less than with R436A refrigerant. In the case of the BTC cycle in which only the FZC operates, the total exergy destruction rate with R-600a refrigerant (0.455 kW) is less than with R436A refrigerant. The most exergoeconomic factor among cycle equipment is related to the compressor (about 98%). The highest COP value between cycles is related to the STC cycle with R134a refrigerant.

在本研究中，在实验室中测试了家用冰箱-冰柜的串联二级压缩（STC）循环和旁路二级压缩（BTC）循环的性能。然后，根据实验结果，进行火用、火用经济分析和循环优化。考虑到更换家用冰箱冰柜中的制冷剂是提高这些系统性能和环境影响的方法之一，因此使用并分析了 R436A 制冷剂（46% 异丁烯和 54% 丙烷混合物）来替代以前的制冷剂。最后，使用两种制冷剂对上述循环进行多目标优化。为了进行分析，使用了具有不同循环的两种型号的冷藏-冷冻机（使用 R134a 制冷剂的 STC 循环和使用 R-600a 制冷剂的 BTC 循环）。在这两种型号中，都使用了两个用于冷藏冷冻室的蒸发器。国际标准 (IEC 62552) 用于测试冰箱冰柜。MATLAB 和 REFPROP 9.1 软件用于对系统进行建模。根据分析结果，与 R134a 制冷剂相比，采用 R436A 制冷剂的 STC 循环具有更高的总火用破坏率 (0.727 kW)。在 BTC 循环中，新鲜食品室 (FFC) 和冷冻室 (FZC) 在其中运行，R-600a 制冷剂 (0.422 kW) 的总火用破坏率低于 R436A 制冷剂。在只有 FZC 运行的 BTC 循环的情况下，R-600a 制冷剂 (0.455 kW) 的总火用破坏率低于 R436A 制冷剂。循环设备中最能发挥经济效益的因素与压缩机有关（约 98%）。