Abstract

The use of the group contribution concept in the design of refrigerants for a single effect absorption refrigeration machine is presented. Chosen functional groups were combined according to the known chemistry rules to generate refrigerant candidates. The prediction of vapor-liquid phase equilibria data using the UNIFAC (Universal Functional Activity Coefficient) model and the Peng-Robinson equation of state and the resolution of heat and mass balances over different compartments led to the coefficient of performance (COP). An exergy analysis was carried out in order to assess the performance of the machine by calculating the exergy efficiency, the second law efficiency and the exergy destruction ratio. The design strategy was tested with chosen groups such as Fluor (F) and Methyl (CH₃), Carbon (C), Methine (CH) and Methylene (CH₂) and with N, N Dimethylformamide (DMF) as the absorbent. The results showed Interesting refrigerant-absorbent pairs with reasonably high COP values.

摘要

介绍了在单效吸收式制冷机的制冷剂设计中使用组贡献概念。根据已知的化学规则组合选定的官能团以产生候选制冷剂。使用 UNIFAC（通用功能活动系数）模型和 Peng-Robinson状态方程预测汽液相平衡数据，以及不同隔间的热和质量平衡的分辨率，得出性能系数 (COP)。为了通过计算火用效率、第二定律效率和火用破坏率来评估机器的性能，进行了火用分析。使用选定的基团（例如 Fluor (F) 和 Methyl (CH ₃)、碳(C)、次甲基(CH)和亚甲基(CH ₂ )，并以N,N二甲基甲酰胺(DMF)为吸收剂。结果显示具有合理高 COP 值的有趣的制冷剂-吸收剂对。