潜热利用式复合有机朗肯循环余热回收系统构建及优化-partB

Based on the partA study, we further investigate the effect of the change of operating parameters on the system performance, and conclude that higher high-temperature cycle evaporation pressure and lower high-temperature cycle condensing pressure can improve the system waste heat recovery efficiency; the heat exchanger of low-temperature working mass and coolant, low-temperature cycle condenser, integrated evaporator/condenser, and low-temperature cycle expander have a higher percentage of heat loss, which can be used as the target process for optimization. The net output power of the system, the system radiation efficiency and the radiation loss are used as target objects in a certain operating condition of a heavy-duty diesel engine, and the influence of key operating parameters in the cycle is explored according to a heating strategy that segments the evaporative pressure of the low-temperature cycle. The results show that the output power, efficiency and loss of the system can reach 25.57kW, 49.42% and 26.17kW；the study completes the analysis of the influence law of the working parameters on the latent heat utilization type compound organic Rankine cycle system, which can provide guidance for the system operation.