摘要
提出将回热器与热泵相结合的方式对温度为60℃工业余热资源进行回收,并将25℃的生水加热至90℃。通过对该系统、单独回热器以及单独热泵的余热回收系统的热力学性能进行理论分析与比较,结果表明采用这种热泵与回热器结合的方式具有更好的热力学性能。按一次能源利用率折,该系统产生单位质量热水的耗能相对于后两者分别减少73.4%和48.9%。同时基于对生水加热过程的T-Q图进行分析,发现回热器和热泵相结合加热冷水的方式其(火积)耗散有很大的降低,这是因为该系统中冷水加热过程采取了梯级加热的方式,使得冷热源之间的温度匹配性更好,降低了传热过程的不可逆损失,有利于提高系统的热力学性能。
A heat pump system with heat regenerator was proposed to recover industrial waste heat of 60℃ and heat the raw water of 25℃ to 90℃.Comparisons were made between this proposed system and the single heat regenerator or single heat pump system by analyzing their thermodynamic performance.Results showed that this proposed system exhibited better thermodynamic performance.According to the primary energy ratio,the power consumption for producing unit mass of hot water produced by this proposed system can be reduced by 73.4%and 48.9%,respectively,as compared with the single regenerator and single heat pump system.Also,by analyzing the T-Q diagram,the entransy dissipation of raw water heating process by this proposed system was greatly reduced,indicating the great reduction of the irreversibility during heat transfer process because of the improved temperature match during the heating process,which thus benefits the improvement of the thermodynamic performance of the system.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第10期2107-2110,共4页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展计划(No.2013CB22b304)
教育部新世纪优秀人才支持计划(No.NCET-13-0462)
中央高校基本科研业务费专项资金资助(No.1191320070)
关键词
余热回收
回热器
热泵
热力分析
(火积)耗散
waste heat recovery
heat regenerator
heat pump
thermodynamic analysis
entransy dissipation
