摘要
有机朗肯循环(ORC)发电系统是实现将低品位热能转变为电能的有效途径之一。为实验研究不同冷、热源温度下ORC发电系统性能变化,搭建以R245fa为工质的有机朗肯循环发电系统。研究结果表明:R245fa的蒸发温度和压力随热源温度升高而增大,冷凝温度及冷凝压力随冷源温度提高而上升;随热源温度升高或冷源温度降低,膨胀机膨胀比与系统等熵效率及发电功率与发电效率均增大。在0. 5℃冷源温度下,热源温度从86. 1℃升至108. 5℃,对应的等熵效率从50. 8%上升至65. 3%,火用效率由22. 1%增加到31. 9%,机组发电效率从7%增大到8. 9%;在11℃冷源温度下,热源温度从87. 5℃升至108. 1℃,对应的等熵效率从47. 0%上升到61. 7%,机组发电效率从4. 1%增大到7. 3%。
Organic Rankine cycle power generation system is one of the effective ways turning lowgrade thermal energy into electrical energy. An organic Rankine cycle system is built by using R245 fa as working fluid to analyze the changes of system performance under difffent temperatures of the cold and heatsources. Research indicates: the evaporating temperature and pressure of the R245 fa increase with the incresement of heat source temperature. And the condensing temperature and pressure increase with the incresement of cold source temperature. The expander ratio,isentropic efficiency,power generation and power generation efficiency of system increase with the temperature of the heat source increases or the temperature of the cold source decreases. The power generation efficiency of the unit increases from 7% to8. 9% as the temperature of heat source rises from 86. 1 ℃ to 108. 5 ℃ when cold source temperature is0. 5 ℃. Meanwhile,the isentropic efficiency of expander is raised from 50. 8% to 65. 3%,and the exergy efficiency is ascended from 22. 1% to 31. 9%. The power generation efficiency of the unit rose from 4. 1%to 7. 3% as the temperature of heat source rises from 87. 5 ℃ to 108. 1 ℃ when cold source temperature is11 ℃. Meanwhile,the isentropic efficiency of expander increases from 47. 0% to 61. 7%.
作者
钟绍庚
王子龙
梁浩
张永峰
孙义文
刘占杰
ZHONG Shao-geng;WANG Zi-long;LIANG Hao;ZHANG Yong-feng;SUN Yi-wen;LIU Zhan-jie(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Science and Technology and Industrialization Development Center,Ministry of Housing and Urban-Rural Development,Beijing 100044,China;Qingdao Haier Biomedical Co.,Ltd.,Qingdao 266101,China)
出处
《建筑节能》
CAS
2019年第5期39-44,共6页
BUILDING ENERGY EFFICIENCY
基金
国家自然科学基金青年项目(51606126)
上海市自然科学基金(15ZR428800)
关键词
有机朗肯循环
发电效率
等熵效率
火用效率
热效率
organic Rankine cycle
power generation efficiency
isentropic efficiency
exergy efficiency
thermal efficiency
