基于废热驱动吸收-压缩复叠制冷系统的4E分析与优化

4E analysis and optimization of absorption-compression cascade refrigeration system driven by waste heat

为了营造船舶、冷藏重型卡车的低温环境,提高发动机低品位废热的利用效率,提出发动机废热驱动的吸收-压缩复叠制冷系统,从能量、[火用]、经济和环境的角度建立模型,并进行模拟研究。通过多目标优化,将低温级蒸发温度、低温级冷凝温度、高温级冷凝温度、复叠传热温差作为决策变量,得到系统的最优运行参数。结果表明,在最优运行工况下,系统COP为1.55,[火用]效率为0.246,总成本为15055.23美元/年。

In order to create a low temperature environment for ships and refrigerated heavy trucks and improve the utilization efficiency of low grade waste heat from engine,an absorption-compression cascade refrigeration system driven by waste heat from engine is proposed.The model is established and simulated from the perspectives of energy,exergy,economy and environment.Through multi-objective optimization,the optimal operating parameters of the system are obtained by taking the low-temperature grade evapora-tion temperature,low-temperature grade condensing temperature,high-temperature grade condensing temperature and cascade heat transfer temperature difference as decision variables.The results show that under the optimal operating conditions,the COP of the system can reach 1.55,the exergy efficiency can reach 0.246,and the total cost can reach 15055.23$per year.