中国电机工程学报2018，Vol.38Issue(3)：805-813,后插15,10.DOI:10.13334/j.0258-8013.pcsee.170107
基于传热不可逆的有机朗肯循环热力学分析
Thermodynamic Analysis of Organic Rankine Cycle Based on Irreversibility of Heat Transfer
摘要
Abstract
Irreversible degree of heat transfer process in organic Rankine cycle (ORC) was proposed and defined. Base on trapezoidal cycle, the theoretical model and mathematic formulas of the irreversible degree with performance of ORC (net power output, thermal efficiency and exergy efficiency) were built. The relation and principle between cycle performance and irreversible degree were investigated. Compared with exergy efficiency, irreversible degree can directly reflect the theoretic and numerical relationships between cycle performance and heat transfer. The influence of heat source temperature, evaporation temperature, pinch point temperature difference and Jacob number of working fluids on irreversible degree were analyzed. There exists a shift-temperature of heat source for working fluid; when heat source temperature is lower than this shift-temperature, the irreversible degree has a minimum value, otherwise, the irreversible degree will decrease with the evaporation temperature monotonously without the minimum value. Results show that the relative deviation between theoretical calculations and numerical simulations of ORC is less than 5％. Jacob number is the important factor on the irreversible degree. The influence of heat source temperature on the irreversible degree is obvious, followed by the pinch point temperature difference.关键词
有机朗肯循环/梯形循环/传热不可逆/工质热源转折温度Key words
organic Rankine cycle/trapezoidal cycle/irreversibility of heat transfer/shift-temperature of heat source for working fluid分类
能源科技引用本文复制引用
李新国,南来福,孟庆良,王伟,王竞逸..基于传热不可逆的有机朗肯循环热力学分析[J].中国电机工程学报,2018,38(3):805-813,后插15,10.基金项目
国家自然科学基金项目(51276122). Project Supported by the National Natural Science Foundation of China (51276122). （51276122）
