CIESC Journal ›› 2020, Vol. 71 ›› Issue (S2): 98-103.DOI: 10.11949/0438-1157.20200492

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Constructal optimization for an organic fluid shell-and-tube condenser based on entransy theory

Huijun FENG3(),Lingen CHEN1,2(),Zhixiang WU3,Wei TANG3,Junchao SHI3   

  1. 1.Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei, China
    2.School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei, China
    3.College of Power Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China
  • Received:2020-05-06 Revised:2020-05-10 Online:2020-11-06 Published:2020-11-06
  • Contact: Lingen CHEN

基于理论的有机工质管壳式冷凝器构形优化

冯辉君3(),陈林根1,2(),吴志祥3,唐威3,石俊朝3   

  1. 1.武汉工程大学热科学与动力工程研究所,湖北 武汉 430205
    2.武汉工程大学机电工程学院,湖北 武汉 430205
    3.海军工程大学动力工程学院,湖北 武汉 430033
  • 通讯作者: 陈林根
  • 作者简介:冯辉君(1985—),男,博士,讲师,huijunfeng@139.com
  • 基金资助:
    国家重点研发计划项目(2017YFB0603503);国家自然科学基金项目(51779262);海军工程大学自主立项科研项目(425317Q017)

Abstract:

A complex function composed of linear weighted sum of the entransy dissipation rate (EDR) caused by heat transfer and total pumping power is established in this paper. Under the conditions of fixed total condensation rate and heat transfer area, constructal optimization of a shell-and-tube condenser (STC) with organic fluid is carried out by taking minimum complex function as optimization objective. The minimum complex function and the optimal external diameter of the condensation tube are obtained. The results show that compared with the initial design construct, the optimal construct of the STC increases the total EDR caused by heat transfer by 10.70%, and reduces the total pumping power and complex function by 54.94% and 6.46%, respectively. This illustrates that the complex function sacrifices a certain heat transfer performance, and improves the fluid flow performance evidently, which leads to the overall performance improvement of the STC. The twice minimization of the complex function can be realized by choosing an appropriate number of the condensation tubes. New guidelines for the optimal structure designs of the STCs are provided by introducing entransy theory into constructal optimizations of the organic fluid STCs, and this method can be further extended to the optimal designs of the cycle systems with organic fluids.

Key words: constructal theory, shell-and-tube condenser, phase change, heat transfer, flow, entransy dissipation, generalized thermodynamic optimization

摘要:

建立考虑传热耗散率和总泵功率的线性加权复合函数,在总冷凝率和总传热面积一定的条件下以复合函数最小为目标,对有机工质的管壳式冷凝器进行构形优化,得到最小复合函数和冷凝管最佳外径。结果表明:冷凝器最优构形与初始设计结构相比,总耗散率提高了10.70%,而总泵功率和复合函数分别降低了54.94%和6.46%。这说明复合函数牺牲了一定的传热性能,使得冷凝器流动性能显著提高,最终使得其综合性能得到提高。选择合适的冷凝管数目可实现复合函数二次最小化。将理论应用到有机工质管壳式冷凝器的构形优化中,为其结构优化设计提供了新的指导,这一方法可进一步推广到有机工质循环系统的优化设计中。

关键词: 构形理论, 管壳式冷凝器, 相变, 传热, 流动, 耗散, 广义热力学优化

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