Thermoeconomic optimization and investigation of condensation effect on Shell & Tube condenser in the presence of non-condensable gases with a new approach

Authors

Mechanical Engineering Department, Arak University of Technology, Arak, Iran.

Abstract

A thermo-economic performance optimization has been carried out for a shell and tube condenser TEMA-E. In the considered model, the irreversibilities due to heat transfer between the hot and cold stream are taken into account. The objective function is defined as the actual heat transfer rate per unit total cost considering lost exergy and investment costs. The optimal performance and design parameters which maximize the objective function have been investigated. The effects of the technical and economical parameters on the general and optimal thermo-economical performances have been also discussed. The results show that the objective function increases with increasing heat capacity ratio and decreasing inlet temperature and ambient temperature ratio. The dominant term in entropy generation in this study is due to the heat exchange between the condensed fluid and the cold fluid. According to the operating conditions of the heat exchanger, a correlation has been obtained for the thermal efficiency that maximizes the objective function. Optimal value of the design variables obtained from Pattern search method and the Ant Lion Optimizer method are relatively different at about 0-0.13%; depending on the type of optimization method and its internal operators. But the optimal value of the objective function in both methods is approximately 16.08. The analysis and optimization presented herein may provide a basis for both determinations of the optimal performance parameters for real heat exchanger.

Keywords


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