基于总效率最优的中低温余热有机朗肯循环性能

来源期刊:中南大学学报(自然科学版)2016年第3期

论文作者:孙志强 樊明强 周天 周孑民

文章页码:1030 - 1039

关键词:有机朗肯循环;中低温余热;离散模型

Key words:organic Rankine cycle; low-medium temperature waste heat recovery; discretized model

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%。

Abstract: 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.

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