[火积]耗散理论在平行流热管换热器性能评价中的应用  

On the Application of Entransy Dissipation in the Performance Evaluation of the Parallel-Flow Channel Heat Pipe Exchanger

作　　者：吴喆 李奇贺[1,2] 赵孝保[1,2] Wu Zhe;Li Qihe;Zhao Xiaobao(School of Energy and Mechanical Engineering,Nanjing Normal Lniversity,Nanjing 210023,China;Engineering Laboratory of Energy System Conversion and Emission Reduction of Jiangsu Province,Nanjing Normal Lniversity,Nanjing 210023,China)

机构地区：[1]南京师范大学能源与机械工程学院,江苏南京210023 [2]南京师范大学江苏省能源系统过程转化与减排技术工程实验室,江苏南京210023

出　　处：《南京师范大学学报（工程技术版）》2021年第2期9-14,共6页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：江苏省研究生科研与实验创新计划项目(KYCX20_1243)。

摘　　要：[火积]耗散作为传热过程可逆性判断依据,可应用于换热器优化.分析探究了热管换热器的温差、充液率、倾角及迎面风速对[火积]耗散的影响,利用焓差实验室进行平行流热管换热器性能试验.随温差增大,[火积]耗散增大.随充液率增大,[火积]耗散先增大后减小,温差越大,[火积]耗散变化幅度随充液率增大而增大.增加倾角,[火积]耗散比未倾斜时小.随迎面风速增大,[火积]耗散减小,且减小幅度随温差增大而增大.相同传热量,[火积]耗散值最小时,为系统最优工况.Entransy dissipation is used as a invertibility judgment in the heat transfer process,which can be applied to heat exchanger optimization.In this paper,we investigates the effects of temperature difference,liquid filling rate,inclination and approach velocity of the heat pipe exchanger on entransy dissipation.The performance test of the small channel heat pipe exchanger is carried out by using the enthalpy difference laboratory.The results show that the entransy dissipation increases as the temperature difference increasing.With the increase of liquid filling rate,the entransy dissipation increases first and then decreases.The change of entransy dissipation increases with the increase of the liquid filling rate,as the temperature difference increases.The entransy dissipation is smaller with increasing inclination than without inclination.The entransy dissipation decreases with the increase of the approach velocity,and the decreasing speed increases as the increase of temperature difference.In the case of same exchanging heat quantity and the entransy dissipation is the smallest,the system works at the optimal operation.

关 键 词：热管换热器 [火积]耗散 温差 充液率 倾角 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]