低温有机朗肯循环系统参数的理论与实验优化

Theoretical and Experimental Optimization of Low-Temperature Organic Rankine Cycle System Parameters

着眼于低温热能的发电利用,以R245fa为循环工质、系统比净功最大为目标,针对进口温度为90,℃的热水型热源开展有机朗肯循环参数理论优化与系统参数实验优化研究.理论优化得最优蒸发、冷凝温度分别为62,℃和33,℃.ORC系统实验得最优蒸发温度为69,℃,此时系统实验比净功为4.31,kJ/kg;测得实验所用涡旋式膨胀机的最优转速和最优压比分别在800,r/min和1.9左右,在该转速和压比附近,膨胀机的定熵效率取得最大值82.7%.

Parametric optimization was carried out theoretically and experimentally to maximize the net power output of the organic Rankine cycle system with R245fa as working fluid, based on a hot-water type heat source of an inlet temperature of 90 ~C. The theoretical optimal evaporating and condensing temperatures are 62℃ and 33℃ respectively, while the experimental optimal evaporation temperature is 69 ℃ and the system net power is 4.31 kJ/kg. The optimal speed and pressure ratio of the scroll expander employed in the experimental system are 800 r/min and 1.9 respectively. The maximum isentropic efficiency value of the expander is 82.7%.