Multi-Objective Optimization of Double-Pipe Heat Exchangers from the Point of View of Efficiency and Economics

The purpose of this study is to investigate the cost and efficiency of a double-pipe heat exchanger. Furthermore, by utilizing NSGA۲, the operational expenses were minimized, and the efficiency was maximized. The cold fluid mass flow rate, outer tube diameter, inner tube diameter, and cold fluid outlet temperature are selected as design variables. Additionally, in this research, the Witte-Shamsundar efficiency and performance index were studied for the double-pipe heat exchanger, and the impact of various parameters was examined. Optimizing results showed that the efficiency and heat transfer rates increased ۲۱% and ۴۳%, respectively. In addition, the operational cost experienced a reduction of approximately ۵۸%. The findings indicate that, as the average velocity of the hot fluid increases, the number of transfer units increases, increasing efficiency. Also, for a given inner tube diameter, the highest Witte-Shamsundar efficiency is achieved when the hot side mass flow rate is equal to the cold side mass flow rate. The Witte-Shamsundar efficiency decreases with increasing the hot fluid inlet temperature. As the cold side mass flow rate increases, the performance index of a double- pipe heat exchanger decreases.  It is found that if a double pipe heat exchanger is required to increase the mass flow rate of hot fluid, provided that the mass flow rate of hot fluid is greater than that of cold fluid, the cost increase will be minimal. Moreover, it has been observed that the present investigation has yielded significantly more optimal outcomes.

کلیدواژه ها:

Double-pipe heat exchanger ، Economics ، Efficiency ، Performance Index ، Multi-objective optimization