The Performance Experiments And Research Of LPEC Plate Air Preheater

Because of its high heat transfer coefficient and low investment cost, plate heat exchanger has been greatly developed in recent years. It is widely used in electric power, chemical, metallurgy, construction, HVAC and other industries, and it has a tendency to gradually replace the traditional management heat exchanger. The criterion of heat transfer relationship and the resistance relationship are main basis in plate heat exchanger designing. For the enterprises with the capabilities of design and manufacturing, they are included in the category of intellectual property, belonging to the commercial secret, so they have to independent development and. research In this case, Yanxin Technology Co., Ltd. has developed a new self-designed riveted plate air preheater, and delegated the heat engineering laboratory of HUST to test its thermal transfer performance.There are three focuses in this paper. Firstly, through experiments, we can define the criterion of heat transfer relationship and the resistance relationship of LPEC plate air preheater, and from the error analysis, we can get a heat transfer coefficient total error of 5.55%, consistent with design requirements. Secondly, under the guidance of the experiment, we have done the numerical simulation using Fluent, and compared with experimental results, it showed that all the simulation results and experimental results have similar variation. When3000 < Re< 8000, the relative deviation between simulation results and the experimental results is less than 10%, agree well to the experimental, proving the model for the simulation is correct; when Re < 8000, we can guide the design using the simulate relationship. Thirdly, based on the definition of entransy and the analysis of entransy dissipation, we can derive the definition and relationship of equivalent thermal resistance, thermal resistance factor and dimensionless thermal conductivity, etc., and then derive the relationship between thermal resistance factor and validity, dimensionless thermal conductivity and validity, heat capacity flow ratio and heat transfer units, of all kinds of flow pattern (downstream, upstream, crossing stream ).As a result, we find the relationships have nothing to do with the style and flow pattern of heat changer, so we can do comparison within all kinks of heat changers. At last, from analyzing function and graphical, it further revealed the internal relations and mutual influence, to guide engineering design. Based on the definition of entransy, we analyzed heat transfer efficiency of the heat exchanger in terms of entransy transfer efficiency, and know that the entransy transfer efficiency related to temperature only, but the style and flow pattern of heat changer, so deferent style and flow pattern of heat changer can be compared.