基于总效率最优的中低温余热有机朗肯循环性能  

Performance of a low-medium temperature organic Rankine cycle(ORC) based on optimal overall energy conversion efficiency

作　　者：樊明强[1] 周天[1] 孙志强[1] 周孑民[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第3期1030-1038,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(U0937604);长沙市科技计划项目(K1403055-11)~~

摘　　要：为提高有机朗肯循环在回收中低温余热领域的效率,建立固定换热面积的蒸发器离散模型,分析变压力比、冷凝温度、蒸发温度和工质质量流率对有机朗肯循环性能的影响。研究结果表明:当蒸发温度和压力比一定时,存在不同的最佳冷凝温度使系统总效率和循环效率最高,其值分别可达8.95%和7.20%;当冷凝温度一定时,系统总效率随蒸发温度升高而增加;系统总效率与工质质量流率变化规律一致;而除在蒸发温度变化工况下,冷却水温度对系统总效率的影响不超过0.23%。In order to improve the efficiency of organic Rankine cycle（ORC） in the field of low-medium temperature waste heat recovery, a discretized model of evaporator with constant heat exchange area was built. The effects of the pressure ratio, the condensing temperature, the evaporation temperature, and the mass flow rate of the refrigerant on the performances of the ORC were analyzed. The results show that the different optimal condensing temperatures are found to maximize the overall energy conversion efficiency and the cycle efficiency which can reach 8.95% and 7.20%, respectively, when both the evaporation temperature and pressure ratio are fixed. The overall energy conversion efficiency increases with the increase of the evaporation temperature at certain condensing temperature. The overall energy conversion efficiency is consistent with the mass flow rate of the refrigerant. The maximal influence of the temperature of cooling water on the overall energy conversion efficiency is less than 0.23%, except under the working conditions of varying the evaporation temperature.

关 键 词：有机朗肯循环 中低温余热 离散模型 

分 类 号：TK115[动力工程及工程热物理—热能工程]