Abstract
In this article, a mathematical simulation of a plate-fin and tube heat exchanger (PFTHE) is presented. Water flows in the tubes and air flows perpendicular to the tube axis. The general numerical model was developed to perform the transient operation of the heat exchanger. The Reynolds number on the waterside ranged from 4,000 to 12,000. The transient response of the PFTHE was modeled for a rapid decrease in the water volume flow rate in time. The heat transfer correlation for the air side was established using the empirical data. Unknown parameters present in the power-type relationship for the airside Nusselt number were estimated using the least-squares method. The waterside heat transfer coefficients in the transitional and turbulent flow ranges were calculated using the semi-empirical heat transfer correlation. The results of the mathematical simulations of the investigated PFTHE were compared with the measurement data. The agreement between computation and measurement results, i.e., between the calculated and measured air and water temperatures at the outlets of the PFTHE, was very satisfactory.
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