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Along with social progress and development, people on the indoor environmental conditions, increasing demand, air conditioning become indispensable facilities. Especially for different occasions, for the air handling requirements are different, the end of a fixed form of air treatment such as fan coil air system has been unable to meet the requirements. If the different functions of the processing facilities in accordance with a certain fixed sequence assembled together, poor ability to adapt. Thus, the proposed modular air concept. Modular air conditioning units with air, filter, cooler, heating, humidification, air purification, noise, and other air-handling features, you can conduct a more sophisticated air handling, air volume range 2000m3/h-200000m3/h, and meet different conditions and a variety of installation requirements. However, the design of a complex modular system, if only by manual design, not only designed for a long time, low efficiency, more difficult to form equipment selection optimization process. Therefore, the development of a portfolio can be freely configured modular air conditioning selection software, complete model of each functional module design and simulation process, will greatly improve the design efficiency. The main contents are: first, to discuss the calculation of physical properties of moist air, fitting two kinds of practical and effective formula tp saturated vapor, and the establishment of the physical properties of moist air iterative calculation model. Detailed analysis of the calculation model of the process of moist air, and according to the continuity equation, energy conservation equation, momentum conservation equation and heat transfer equation, the establishment of the cooler were wet and dry conditions when the heat and mass transfer model; second established based on lumped parameter method cooler performance simulation model that can simulate the predicted cooler performance changes in variable structure, evaluation becomes cooler load regulation in different ways under the operational status; in the model based on the cooler in a different gain factor structures were compared and analyzed, so as to optimize the structure of the cooler to provide evidence. Third, based on similarity theory in modular air blower centrifugal fan type design applications, summed up the fan similarity theory formulas. The fan characteristic curve fitting of the data, and the fitting results are analyzed. The method proposed uses nested functions fan characteristic curve fitting, the model can take into account the trend of physical and mathematical accuracy of the model. Fourthly, in front of the establishment and design of simulation model and its algorithm is based on the use VB programming language developed specialized object-oriented development of modular air digital design software. Software, high accuracy, fast calculation and a good user interface, modular air conditioning for designers and users of air conditioning has a high practical value.
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