Investigation of a falling film tube bank heat exchanger with baffle design for water recovery applications  

作　　者：Liang Tang Xiaoling Cao Wei Zhong Long Yu Linlin Yin 

机构地区：[1]Shandong Electric Power Engineering Consulting Institute Corp.,LTD.,Jinan 250013,PR China [2]School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,PR China

出　　处：《Energy and Built Environment》2024年第5期817-828,共12页能源与人工环境（英文）

摘　　要：Shell and tube heat exchangers(STHE)are essential thermal equipment and widely used in daily life.A novel thermosyphon system called falling-film thermosyphon(FFTS)is introduced and integrated into STHE system,resulting in a better thermal performance.In this study,a rectangular solid tube bank of FFTS bundles with a baffle design is studied.The numerical simulation for heat and mass transfer of the FFTS heat exchanger is developed to predict the condensation rate of the vapor in the flue gas,and a lab-scale prototype is also built up in COMSOL.The prediction is validated with the experimental data from references,and the model’s accuracy is verified within 10%-12%error.Also,the Non-dominated Sorting Genetic Algorithm,version 2(NSGA-II)is implemented to improve the thermal performance of rectangular tube banks in this paper.Several parameters,e.g.,baffle number,tube number,and tube space,are optimized.As a result,compact configurations with more baffles are preferred to enhance the performance associated with a high-pressure drop correspondingly.The optimized layout for the lab-scale prototype can increase by 18 to 32%condensation with a pressure loss of less than 200 Pa.

关 键 词：Falling film Heat transfer CONDENSATION NSGA-II algorithm Heat exchanger 

分 类 号：TK172[动力工程及工程热物理—热能工程]