Performance Analysis And Experimental Study Of Plate-Fin Heat Exchanger

Plate-fin heat exchanger, with its compactness and high efficiency, can make better use of energy, cut down the running cost and reduce the scale of the equipment. Therefore, it's widely used in all kinds of industrial departments. It is a kind of significant heat-utilized equipment in both manufacturing and life. In this thesis, the wind-tunnel system, the method and content of the experiment are to be introduced. What's more, with the guidance of the principle of field synergy, numerical research has been carried out both through self-programming and FLUENT. The detail is as follows:The principle of field synergy, uniformity principle of temperature difference field (TDF) and principle of field synergy for the heat exchangers are summarized systematically and comprehensively. Examples of the applications in multi-steam heat exchangers with uniformity principle of TDF and examples of field synergy in the design of heat exchangers are provided.As for the experimental research, the method for calculating the j factor and f factor of the plate-fin heat exchanger is to be shown in the third chapter, followed by the detail introductions of the wind-tunnel system, data acquisition system, the aim and content of the experiment and data handling method. At the same time, the data acquisition & handling software and the post processing software are simply referred.As to numerical calculation, after analysis of the heat exchange and flow of the plate-fin heat exchanger, Prasad's model is modified to yield to real situation. The author compiles software to calculate the temperature field, which is of good value for the arrangement of the multi-stream, design and research of plate-fin heat exchanger.Finally, based on the situation of the flow and heat exchange in two stream plate-fin heat exchanger, the author greatly simplifies the straight-fin and indented-fin plate-fin heat exchangers. With the limited computer source, the author set up the model and calculate it with GAMBIT and FLUENT. Using the post processing software of the wind-tunnel system, j factor and f factor are both calculated. With the guidance of the principle of the filed synergy, the author brings forward a new opinion for the design of the indented fin's parameter in airside. According to this method, the increase of heat exchange is more than the increase of the flow resistance.