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Based on the purpose of energy saving and waste reduction, the characteristics of the MAU components, including air filter, fan, cooling dehumidification coil, heating coil, air Washer, humidifier and back draft damper, are described detailed in this thesis to clarify the requirements of the theoretical cooling dehumidification process, discuss the possible methods of cooling dehumidification and compare the differences and suitability between the cooling and the chemical dehumidification. The energy budgets of MAU are also discussed according to the characteristics of MAU described previously. The possible methods of the energy saving include recovering the cooling capacity of exhaust air by heat exchange coil, heat exchange with cooling coil by installing heat exchange coil or heat pipe, the application of double chilling water system, series connection of chilling water for MAU, the comparisons of blowing and drawing draft, selecting of the best running point of fan, inter-energy consuming conducted by reheating coil after cooling dehumidify process, preventing the evaporation of condensing water from cooling coil, the comparisons of chemical dehumidify and cooling dehumidify, reducing pre-heating temperature of humidification in winter, the key points of sufficient use of heat recovery chiller, how to increase the efficiency of air borne contamination removal, the restriction of using air washer as a humidifier, reducing the leakage of clean air and reducing the release of clean air. The experienced equations and parameters of the air psychrometry published in the ASHRAE Handbook of 1993 and 1997 Fundamentals are refered. The differences between these two versions are compared. The accuracy units are clarified. The Excel Program is developed to calculate the properties of the saturated wet air and the results are compared with the theoretical data and the psychrometric charts published by ASHRAE, Trane Company and Carrier Company. In order to estimate the possible methods of saving energy for MAU, the model including the mass and energy conservation equations are developed. And the possible ways of energy savings are then discussed in detail. Finally, the annual weather data of Hsin-Chu area is added to the model of MAU to calculate the energy consuming of MAU. The possible methods of energy saving are proposed.
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