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Optimum Design of the Dew Point Indirect with Direct Evaporative Cooling Air Conditioning Unit

Author: LiuXiaoWen
Tutor: HuangXiang；WuZhiXiang
School: Xi'an University of Engineering
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: And Dew Point indirect evaporative cooler Best secondary / primary air ratio Dew point temperature The efficiency of heat transfer Resistance
CLC: TU831.4
Type: Master's thesis
Year: 2011
Downloads: 126
Quote: 1
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Abstract


In today's world, energy conservation has become the main trend of the international world. Large air conditioning as building energy consumption, with the progress of society, continues to increase. HVAC system energy saving is particularly important. Evaporative cooling as an energy-saving, environmental protection, and efficient air conditioning system has been more and more attention, and then how to further enhance the existing heat transfer efficiency of evaporative cooling equipment to maximize energy efficiency, our evaporative cooling air conditioning new requirements. The dew point indirect evaporative cooling compared with traditional forms of evaporative cooling, heat transfer efficiency greatly improved, but the distance ideal dew point temperature, there is a certain gap. This article as a starting point, high humidity climatic conditions of the region, the dew point indirect - direct evaporative cooling air conditioning optimized design and experimental study of the effect of heat transfer of the machine, respectively, from the dew point indirect segment structure and choice of filler . First of all, from the principle of the theoretical air conditioning units, strengthening of the characteristics of heat and mass transfer analysis, and in accordance with the invention patents with independent intellectual property rights of the dew point plate indirect evaporative cooler design and processing of the experimental prototype. Through comparative experiments on five filler GLASdek, CELdek, aluminum foil, PVC and cooling tower with a porous ceramic filler after the following conclusions: (1) test the PVC packing efficiency reduced watering density increases. In this experiment sprinkling density 1600kg/m2h, efficiency can be maximized. (2) the efficiency of the ceramic filler is higher than that of aluminum foil, and after CELdek. But resistance. (3) the various fillers resistance with changes in face velocity basic exponential function change, and the change varies linearly with the sprinkling density and changes gently. The face velocity filler overcurrent resistance significantly larger than the sprinkling density. (4) A variety of fillers have respective optimum sprinkling density and best wind speed. Comprehensive consideration of the efficiency of the resistance both factors in the experimental range, recommend the best watering density and speed combination: 1600kg/m2h, 2.5m / s. In-depth analysis of the performance of the whole design build Dew Point Indirect - direct evaporative cooling air conditioning prototype experiment station, and compared with conventional dew point indirect evaporative cooler, the experimental results show that: (1) within the range of this experiment, separate open precooling segment secondary fan and main fan, pre-cooling segment best secondary / primary wind than 1.2, efficiency up to 0.72. The primary side resistance decreases as the primary air volume decreases. (2) a separate open secondary fan and main fan cooling section, cooling section of the best secondary / primary air than 1.69. With the increasing secondary / primary air ratio, a side wind declining, while the secondary side wind speed passive change slightly increases. Side resistance decreasing with decreasing wind speed, secondary side resistance is slowly increasing as the wind speed changes. (3) When the pre-cooling and cooling sections of secondary / primary air ratio of 1.2 and 1.5, turn on fans and pumps of various functional segments, machine temperature drop of up to 10.24 ° C. (4) in the Fuzhou area, plus pre-cooling segment, the dew point indirect evaporative cooling efficiency than general dew point indirect evaporative cooler significantly improved its temperature drop close to use direct evaporative cooling effect alone, and does not increase the air moisture content. (5) in such a high-humidity areas in Fuzhou, the whole joint operation, the outlet temperature is lower than the local outdoor air wet bulb temperature close to the dew point temperature. Than alone greatly improve the use of direct evaporative cooling temperature drop, humidity and small. Then cooling end temperature and humidity and dry areas, will surely be more approaching the dew point temperature.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning > Air-conditioning machinery and equipment
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