Abstract
Abstract A high accuracy of experimental correlations on the heat transfer and flow friction is always expected to calculate the unknown cases according to the limited experimental data from a heat exchanger experiment. However, certain errors will occur during the data processing by the traditional methods to obtain the experimental correlations for the heat transfer and friction. A dimensionless experimental correlation equation including angles is proposed to make the correlation have a wide range of applicability. Then, the artificial neural networks (ANNs) are used to predict the heat transfer and flow friction performances of a finned oval-tube heat exchanger under four different air inlet angles with limited experimental data. The comparison results of ANN prediction with experimental correlations show that the errors from the ANN prediction are smaller than those from the classical correlations. The data of the four air inlet angles fitted separately have higher precisions than those fitted together. It is demonstrated that the ANN approach is more useful than experimental correlations to predict the heat transfer and flow resistance characteristics for unknown cases of heat exchangers. The results can provide theoretical support for the application of the ANN used in the finned oval-tube heat exchanger performance prediction.
Highlights
External finned tube heat exchangers are widely used in various industries such as chemical engineering and heating and ventilation compressor intercoolers
In view of the aforementioned facts, this study proposes a dimensionless experimental correlation equation including air inlet angles to make the correlation have a wide range of applicability
The comparison of mean-squared error (MSE) of Nu and f predicted together for the four air inlet angles with classical correlations and correlations with the air inlet angles is shown in Figure 11, from which it can be clearly seen that the values of MSE from the artificial neural networks JF (ANNs) prediction are smaller than experimental correlations, excepting the one of f for 60°
Summary
External finned tube heat exchangers are widely used in various industries such as chemical engineering and heating and ventilation compressor intercoolers. They occupy an extremely significant position in the air cooling towers and air separators. The extended surfaces on the air side are used effectively to enhance the heat transfer performance of such heat exchangers. The finned surface is a common type of extended surfaces. It can be used to destroy the boundary layer, increase the surface area, and change the flow pattern to meet the demand of heat transfer enhancement. The schematic diagram of the plain finned tube heat exchanger units is shown, including circular tubes, oval The schematic diagram of the plain finned tube heat exchanger units is shown in Figure 1, including circular tubes, oval
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