摘要
本文研究了一种完全由余热驱动的吸收压缩复合式低温制冷系统。该系统由混合工质动力子循环和吸收压缩复合式制冷子循环有机耦合而成,模拟计算结果表明,该系统在制取-55℃冷量时的整体性能系数和效率分别达到了0.357和28.02%,分别比参比系统提高了19%和57.77%。通过分析和循环耦合分析,揭示了该系统的节能机理。另外,还研究了动力子循环工质浓度、透平入口压力和压缩机出口压力对系统热力性能的影响。结果表明,为了保证较高的热力性能,这三个影响因素均存在最佳值,且其中压缩机出口压力最为敏感。经济性分析指出,新系统比投资比参比系统相对减小了12.23%。本研究为分布式供能系统提供了新的余热利用方法。
This paper studied an absorption-compression low-temperature refrigeration system driven by waste heat.The system consists of power generation subsystem using mixture working fluid and absorption-compression refrigeration subsystem.Simulation results showed that,when the evaporation temperature is-55℃,the coefficient of performance（COP） and exergy efficiency reach0.357 and 28.02%,which are 19%and 57.77%higher than the reference system,respectively.Energy saving mechanism was elucidated by exergy analysis and coupling configurations analysis.Besides,the effects of the working fluid concentration of the power subsystem,the turbine inlet pressure and the compressor outlet pressure on the system＇s thermodynamic performance were analyzed to provide guidance to system design.There exist optimum values for these three influencing factors,and the compressor outlet pressure is the most sensible one.Compared with the reference system,the specific capital cost of the proposed system decreases by 12.23%.This study may provide a new way to utilize the waste heat for the distributed energy system.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第1期18-26,共9页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展计划项目(973计划)(No.2013CB228302)
国家自然科学基金研究项目(No.51576191)
关键词
低温制冷
混合工质
循环耦合
热力学分析
热能梯级利用
low-temperature refrigeration
mixture working fluid
cycle coupling
thermodynamic analysis
cascade utilization
