This paper presents a steady-state model of a vapor compression refrigeration system (VCRS) that produces 1200 l of chilled water (5 °C) for an indirect expansion air-conditioning system (IEACS) and 600 l of hot water (40 °C) for bath. The proposed model was used to design a VCRS with reduced geometric structure and to compare the environmental, energy and exergy performance of R290, R1234yf, R744 with R134a. Also, this model uses for each refrigerant volumetric and global efficiency curve obtained from commercial compressors. The metrics applied to assess the environmental, energy and exergy performance are respectively the TEWI (Total Equivalent Warming Impact), COP and Exergy Efficiency. Besides, an optimization method was applied to a range of values related to the diameters of the water and refrigerant tube to reduce the geometric structure of the VCRS to an optimal size. COP analysis indicated that the optimized system operating with R290 presented higher energy performance for an evaporation temperature of −3 °C and condensation/gas cooling temperature of 45 °C. TEWI analysis showed that the system with R290 has higher environmental performance for an evaporation temperature of −3 °C and condensation/gas cooling temperature of 45 °C. For this thermodynamic condition, the system with R290 also presented higher exergy efficiency. Finally, a comparative study was performed to evaluate the refrigerant charge in the optimized systems. The results show that the refrigerant charge in the systems with R744, R1234yf and R134a is 102.4%, 126.9%, 114.2% respectively higher than the refrigerant charge in the system with R290 for the established thermodynamic condition.

本文介绍了蒸汽压缩制冷系统（VCRS）的稳态模型，该模型可为间接膨胀空调系统（IEACS）产生1200升的冷冻水（5°C）和600升的热水（40°C） ）洗澡。所提出的模型用于设计具有减小的几何结构的VCRS，并比较R290，R1234yf，R744和R134a的环境，能量和火用性能。此外，该模型还使用了从商用压缩机获得的每种制冷剂的体积和总体效率曲线。用于评估环境，能源和火用性能的指标分别是TEWI（当量变暖总影响），COP和火用效率。除了，将优化方法应用于与水和制冷剂管的直径有关的一系列值，以将VCRS的几何结构减小到最佳尺寸。COP分析表明，以R290运行的优化系统在-3°C的蒸发温度和45°C的冷凝/气体冷却温度下表现出更高的能量性能。TEWI分析表明，具有R290的系统具有较高的环境性能，蒸发温度为-3°C，冷凝/气体冷却温度为45°C。对于这种热力学条件，带有R290的系统还具有更高的火用效率。最后，进行了一项比较研究，以评估优化系统中的制冷剂充注量。结果表明，在具有R744，R1234yf和R134a的系统中，制冷剂充注量分别为102.4％，126.9％，