联合热驱动布朗热泵循环的建模与性能分析  

Modeling and performance analysis of a combined thermal Brownian heat pump cycle

作　　者：齐丛正 丁泽民[3] 陈林根 戈延林 冯辉君 QI CongZheng;DING ZeMin;CHEN LinGen;GE YanLin;FENG HuiJun(Institute of Thermal Science and Power Engineering,Wuhan Institute of Technology,Wuhan 430205,China;School of Mechanical&Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China;College of Power Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]武汉工程大学热科学与动力工程研究所,武汉430205 [2]武汉工程大学机电工程学院,武汉430205 [3]海军工程大学动力工程学院,武汉430033

出　　处：《中国科学：技术科学》2021年第12期1519-1529,共11页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:51779262,51576207,51306206);湖北省自然科学基金(编号:2017CFB498);海军工程大学自主立项科研基金(编号:425317Q016)资助项目。

摘　　要：基于有限时间热力学理论,本文建立了具有中间热源的两级联合热驱动布朗热泵循环模型.该循环模型由两个热驱动布朗热泵串联组成.两热泵工作在温度恒定的三个热源间,热源与热泵间存在有限速率的传热过程.考虑热源与热泵间的传热损失,导出了系统的供热率和供热系数解析式,通过数值计算分析了设计参数对联合布朗热泵循环性能的影响.结果表明供热率随势垒高度单调递减,随外力和势垒不对称度单调增加.供热系数关于势垒高度、势垒不对称度和外力都有最大值.当顶部和底部热源温度一定时,中间热源温度与顶部热源温度越接近,供热率和供热系数越大.比较了工作在相同温度热源下单级布朗热泵循环与联合布朗热泵循环的性能,结果表明联合热泵循环的供热率更大,但是供热系数会相对减小.Based on finite-time thermodynamics theory,this paper proposes a two-stage thermal Brownian heat pump cycle model combined with an intermediate reservoir.The model is formed by two Brownian heat pump cycles operating in series.Two heat pump cycles operate between three heat reservoirs with constant temperature.In this regard,finite-rate heat transfer processes exist among heat pump cycles and reservoirs.In consideration of the heat transfer losses among reservoirs and heat pump cycles,the expressions of heating load and coefficient of performance(COP) are derived.The influence of design parameters on system performance is analyzed by numerical calculations.Results show that heating load decreases monotonically with the increase in the barrier height of the potential and increases monotonically with the increase in the external load and the asymmetry of the potential.The COP reaches the maximum values with the barrier height of the potential,the asymmetry of the potential,and the external load.When the heat reservoir temperatures are constant,the closer the intermediate heat reservoir temperature is to the topping cycle heat reservoir temperature,the higher the heating load and the COP.Compared with one-stage thermal Brownian heat pump cycle,which works between the heat source and sink with the same temperatures,the combined Brownian heat pump cycle has a larger heating load but a reduced COP.

关 键 词：有限时间热力学 热驱动布朗热泵循环 联合热驱动布朗热泵循环 供热率 供热系数 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]