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针对太阳能热水和其它低品位热能的动力利用,研究了工作在100℃供热温度和30℃冷凝温度之间的有机朗肯循环工质的优化选择,以满足较高的循环效率、较大的机械能输出、较小的排气量需求等要求。工质模型采用RKS状态方程,针对R22在-30～95℃温度区间内,计算结果与ASHRAE20-2005数据比较,除液相密度外,其它的热力学参数计算绝对误差小于5%,满足工程模拟要求。利用RKS模型,文中分析了19种有机工质的动力循环参数,发现工质R11的热力学性能系数最高。结合GWP和ODP环境指标,发现R142b、Rc318与R600适合于低温朗肯循环。
In view of the power utilization of solar hot water and other low-grade thermal energy, the optimized selection of organic Rankine cycle working fluid working at a heating temperature of 100 ° C. and a condensing temperature of 30 ° C. was studied in order to meet the higher circulation efficiency, Of mechanical energy output, smaller displacement requirements and other requirements. For R22, the RKS equation of state is used. For R22 in the temperature range of -30 ~ 95 ℃, the calculated results are compared with the data of ASHRAE20-2005. Except the liquid density, the absolute error of other thermodynamic parameters is less than 5% . Using RKS model, the paper analyzes the power cycle parameters of 19 kinds of organic working medium, and finds that the coefficient of thermodynamic performance of working fluid R11 is the highest. Combined with GWP and ODP environmental indicators, found R142b, Rc318 and R600 suitable for low temperature Rankine cycle.