| Energy saving and emission reduction has been gradually into all areas of life and production. As a major of buildings energy consumption, traditional mechanical refrigeration air conditioning has a huge potential for energy saving. The use of traditional central air conditioning, as a high-energy device. And, the use of mechanical refrigeration, has damaging effection on the ozone layer and greenhouse production. Therefore need for a non-polluting and energy-efficient refrigeration technology associated with it to reducing damage to the environment. Evaporative cooling technology is a environmental friendly and economy and highly efficient way of cooling through the exchange of heat and moisture to get a cold between the water and air. It can effectively reduce the cost and the running cost of conventional mechanical refrigeration system, to provide the same comfort while saving a lot of energy.Basised on this, for the majority of high humidity areas outdoor weather conditions, proposed evaporative cooling and condensation dehumidifying complex new air handling system. First simulated and analyzed the energy-saving and economy of the indirect evaporative cooling air treatment system, the system was improved and make the experimental prototype, and the performance of experimental prototype was tested, different outdoor environmental parameters under the energy saving potential of the system is analyzed. The results show that:Under the condition that outdoor air is 35℃(21.68g/kg), supply air is 19.3℃(9g/kg), the cooling coil heat transfer capability in heat recovery module is 1.65kW/K, and the mass transfer unit number of the packings is 2.5, the maximum of heat recovery efficiency and the exhaust exergy utilization efficiency is reached when circulating water flow is 1.6kg/s, and the values are 72.6% and 82.2%, respectively.Ascending was shown in optimum circulating water flow rate with the increment of humidity difference and temperature difference of the inlet air, or the decrement of the heat transfer capability of the cooling coil. Little variation of optimum flow rate was observed though mass transfer unit number changed.When the mass transfer unit numberof the packing is greater than 1.3, cooling coil heat transfer capability was suggested to have greater impact on heat recovery efficiency than the packing heat transfer capability does.Total heat recovery by using water as a medium for fresh air and return air, equipment is simple and reliable and low production cost, system’s total heat recovery efficiency is high, compared with direct condensation dehumidification, the supply air temperature is rised and can directly sent into the room. Under the experimental conditions, the total heat recovery efficiency can reach 69%～76% and exergy utilization efficiency can achieve the 58%～67%, COP can reach 4.2～6.4, even in smaller return air volume, the system also has a high coefficient of performance, reduce the cooling capacity of the cooling source input, improve the overall energy efficiency of the fresh air treatment device. When the return air volume is small, the heat recovery efficiency and the exergy utilization efficiency of the system increases with the dry bulb temperature or the moisture content increase of the fresh air. The system not only has a high potential for energy savings, the COP of the system increases with the import of fresh air dry bulb temperature and moisture content increased, this system suitable for high temperature and high humidity areas.The research content in this paper is to extend the evaporative cooling technology application field, To master of evaporative cooling technology and condensation compound fresh air treatment system in the mode of operation and the performance parameters used in high humidity areas, It has a certain guiding significance for the development of energy-saving air-conditioning unit in high humidity areas. |
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