摘要
针对逆流换热器的换热过程,以[火积]耗散最小为优化目标,推导出冷、热流体温度的最佳分布;进而在满足最佳温度分布的前提下,得到了最小[火积]耗散、最小热阻、[火积]传递效率与总传热单元数的关系。引入数值算例,结果显示随着总传热单元数的增加,换热过程不可逆损耗减小,但减小速率也越来越小。同时也证明了[火积]理论比熵理论更适用于换热过程的优化。
In this paper, the optimal temperature distributions of the cold and hot fluids in counterflow heat exchanger were derived based on minimizing the entransy dissipation. Moreover, the relationship among the minimum entransy dissipation, minimum heat resistance, minimum entransy transfer efficiency and total number of transfer units(NTU) was obtained under the optimal temperature distribution. The numerical results show that the irreversible loss of heat transfer process decreases with the increase of NTU, but the reduction rate becomes smaller. In addition, the entransy theory is more suitable for the optimization of heat transfer process than that of the entropy theory.
作者
张朋
姚秋峰
杨雨燊
张建
王定标
Zhang Peng;Yao Qiufeng;Yang Yushen;Zhang Jian;Wang Dingbiao(Zhengzhou University,Zhengzhou 450001,China;Zhejiang Chuangli Automotive Air Conditioner Co.,Ltd.,Longquan 323700,China)
出处
《低温与超导》
CAS
北大核心
2022年第1期57-61,共5页
Cryogenics and Superconductivity
基金
国家自然科学基金(21576245)资助。
关键词
换热器
有限时间热力学
[火积]耗散
传热单元数
效能
Heat exchanger
Finite time thermodynamics
Entransy dissipation
Number of transfer unit
Effectiveness
