Journal
APPLIED THERMAL ENGINEERING
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2022.118424
Keywords
Shell and helically coiled tube heat exchanger; Thermodynamic model; Exergy loss; Exergy loss number; Multi-objective optimization
Funding
- Key Research and development and promotion of Special Science and technology in Henan Province [212102210341]
- Opening Project of the Key Laboratory of Heat Transfer Enhancement and Energy Conservation of Education Ministry (South China University of Technology) [202000109]
- Opening Project of Beijing Key Laboratory of Heat Transfer and Energy Conversion (Beijing University of Technology) [BJKLHTEC2020KFJJ02]
- Doctoral Scientific Research Foundation of Zhengzhou University of Light Industry [2020BSJJ050]
- National Natural Science Foundation of China (NSFC) [51906003]
- Henan Provincial Department of Science and Technology Research Project [212102310096]
- Foundation of He'nan Educational Committee [20A470012]
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This study investigates the exergy analysis of a shell and helically coiled tube heat exchanger (SHCTHX) using MATLAB software. A dimensionless number called heat transfer exergy loss number (xi HT) is proposed, and its effect on the effectiveness, heat transfer exergy loss, and number of transfer units is examined. The study also explores the optimization of the SHCTHX in terms of design parameters. The findings show that the design parameters have an impact on the performance of the heat exchanger, and the optimization results are influenced by the presence of xi HT.
In this study, the Exergy analysis of the shell and helically coiled tube heat exchanger (SHCTHX) were investigated. The heat transfer Exergy loss of the SHCTHX implemented by MATLAB software was developed, where the dimensionless number named heat transfer Exergy loss number (xi HT) was proposed. The effect of parameters (core tube diameter (DC), space between the shell and the core tube (Delta DBC), inner diameter of coiled tube (di), thickness of the coiled tube (dt) and mass flow rate (Mshell)) on the effectiveness (epsilon), heat transfer Exergy loss number (xi HT) and number of transfer unit (NTU) were investigated. Moreover, the optimization of the SHCTHX was studied. When the design parameters are set as DC, Delta DBC, di, and dt, there is coincidently opposite variation trend for xi HT and epsilon, the optimization results of which are identical. When the design parameters are set as DC, Delta DBC, di, dt and Mshell, the effectiveness (epsilon) of optimization results with xi HT is 30% larger than that without xi HT; while the heat transfer area, the overall heat transfer coefficient, the needed mass flow rate and the heat transfer irreversible loss of optimization results with xi HT have reduction of 30%, 15%, 30% and 10% than those without xi HT.
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