Air And Evaporative Cooling Parallel Composite Tower Structure Design And Optimization Analysis

The air and evaporation composite cooler is parallel connection by air-cooled finned tube and evaporative cooling light row tube, which is an energy efficient heat transfer components. Belong tube indirect evaporative cooler for a composite model. The characteristics of the equipment is which can be based on different seasons of climate change switch the run mode, so that the system is running effectively to save energy. By rational analysis and design flow distribution and its area ratio, so that the equipment can improve the heat transfer efficiency and has a good economy and energy efficiency.First, this research is based on the theory of heat and moisture transfer, through analyze the finned tubes and spray water tube heat and mass transfer processes, set up the respective differential equations of heat and mass quality. Hypothesis of differential equations for each variable, calculated the approximate solution, and lay a solid theoretical foundation for subsequent research complex cooling system design..Belong to the second, the cooler actually run contains a complex form of heat exchange, in order to facilitate study of the theory, the subject of the research model has been simplified form of heat in two different conditions were analyzed. Topics chosen to study a chemical plant in Jinan as an example, in the context of plant process and cooling water temperature have been known, using a computer program to exit temperature finned tubes with different discs pipe flow ratio calculations, combined Jinan typical meteorological Year design with outdoor meteorological parameters, derived the surface area of the both tube. To simplify the process of engineering design parameters, based on Visual Basic computer language developed a computer simulation program visualization windows software. Designers can use it design the system in different areas, manually enter the chosen medium thermal process parameters, as well as spray parameters and other basic data, and then calculated the outlet temperature and surface area.Finally, the paper also carried out multi-objective optimization of the cooler. With the minimum number of transfer units in different design conditions that is the minimum heat transfer area as the objective function and with energy efficiency as a constraint, the trends is obtained by computing that the number of heat transfer units in different conditions with the change of the flow rate ratio. A variety of the program of area ratio is obtained by computing and calculate separately for each program the device initial investment and annual operating costs combined the minimum total life cycle cost LCC of the equipment with objective function, from which to choose the program in line with the ratio of the area of multi-objective optimization. By checking climate temperature value outside the tube in the selected program when you stop the spray water, you can determine the device’s time node without water. In order to achieve optimal results, you can come up with a running program for the device by using this time node and Strictly enforce the requirements of the device about energy efficient operation of the form of cooling tower in this program.