Performance analysis and working fluid selection of organic Rankine steam compression air conditioning driven by ship waste heat

In order to effectively use the waste heat of ship flue gas and cooling water, in this paper, the organic Rankine-vapor compression refrigeration system is used for air conditioning for ships, and the thermodynamic model of the system is established. The system performance corresponding to the five commonly used working fluids R22, R141b, R236ea, R218 and R601 is analyzed and compared. The working fluid is optimized with the goal of the best system performance. Calculations proves that: regardless of the organic Rankine cycle and vapor compression refrigeration cycle, or for the entire system, R601 is the most suitable working fluid. The temperature of the heat source and the condensing temperature have an important effect on the performance of the system. The hot water temperature can be controlled and adjusted by changing the hot water flow rate, thereby optimizing system performance. At the same time, the determination of the condensing temperature should comprehensively consider the system performance, cooling water pump power, heat exchanger area and system investment to achieve the best overall system performance.