摘要
为解决传统中低温余热回收系统循环热效率低、冷凝热难以利用的问题,提出了一种并联型有机朗肯循环与喷射式热泵联合循环系统结构。通过并联布置热机子循环与热泵子循环,并增设外部换热器,可回收全部冷凝热量用于制备辐射采暖水,同时系统输出的热电比在一定范围内可调节。建立了系统能量分析模型和?分析模型,对比分析了联合循环与有机朗肯循环的热力性能。研究了部件?损失与系统?流特性,并分析了工质流量比和蒸发温度对系统热力性能的影响规律。结果表明:联合循环热回收效率和?效率比有机朗肯循环分别提高了60.83%和30.76%。?损失最大的两个部件分别是发生器和外部换热器,造成外部换热器?效率低的主要原因是内部传热温差较高。工质流量比对系统热力性能影响显著,当蒸发温度低于25.2℃时,工质流量比的可调节范围最大。本研究成果可为高性能中低温余热回收系统的研发提供指导。
To solve the problems of low thermal efficiency and hard utilization of condensing heat in traditional low and medium temperature heat recovery systems,a parallel type organic Rankine cycle(ORC)and ejector heat pump(EHP)combined cycle(referred to as PCHP)was proposed.The heat engine cycle and heat pump cycle were organized in parallel and an external heat exchanger(EHE)was added.All the condensing heat could be recovered for the production of radiant heating water,and the thermoelectric ratio could be adjusted within a certain range.The energy analysis model and exergy analysis model of the system were established.The thermal performance of the combined cycle and ORC were compared and analyzed.The characteristics of component exergy destruction and system exergy flow were investigated,and the effects of working fluid flow ratio and evaporating temperature on the thermal performance of the system were analyzed.Results show that the heat recovery capacity and exergy efficiency of the combined cycle were increased by 60.83% and 30.76% compared with those of ORC.The two components with the highest exergy destruction were the generator and the EHE.The main reason for the low exergy efficiency of the EHE was the high temperature difference of internal heat transfer.The working fluid flow ratio had a significant effect on the thermal performance of the system.When the evaporating temperature was lower than 25.2℃,the adjustable range of the working fluid flow ratio was the largest.The research results can provide guidance for the research and development of high-performance low and medium temperature heat recovery systems.
作者
张承虎
林己又
谭羽非
ZHANG Chenghu;LIN Jiyou;TAN Yufei(School of Architecture,Harbin Institute of Technology,Harbin 150006,China;Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology(Harbin Institute of Technology),Ministry of Industry and Information Technology,Harbin 150090,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2022年第6期112-118,共7页
Journal of Harbin Institute of Technology
基金
国家自然科学基金面上项目(52076050)。
关键词
热电联产
有机朗肯循环
喷射式热泵
热力性能
?分析
combined heating and power cycle
organic Rankine cycle(ORC)
ejector heat pump(EHP)
thermal performance
exergy analysis
