Research On Temperature And Humidity Independent Control Air-conditioning System Based On Double Temperature Cold Source

In summer, air-conditioning system bear the important task of eliminating the space heat and moisture load, and improving the quality of the indoor air. In the conventional air conditional system, the heat and moisture load are undertaken by the same cold source. Subject to the necessary of eliminating the moisture load, the cold source adopts low temperature evaporation system (evaporation temperature range is 0~5degree, the temperature of import and export chilled water is 12degree and 7degree respectively.) So the work efficiency of the cold source is low in general. Besides, conventional air conditional system also exist some other problems, such as the temperature and humidity control are not independent, the method of humility control is unreasonable (hot and cold offset), wet surface contamination in summer and so on. Aiming at these problems above, this paper mainly analysis an air conditioning system named temperature and humidity independent air-conditioning system control based on double temperature cold source, which rarely applies to a real project in current.This paper bases on the theory of the central air conditioning system to research the temperature and humidity independent air-conditioning system control based on double temperature cold source. The major works of this paper are listed as follows:1.Summary the similar analysis method, research the theory of the temperature and humidity independent air-conditioning system control based on double temperature cold source, the distinguish and characteristics between the temperature and humidity independent air-conditioning system control based on double temperature cold source and the conventional air conditional system are discussed.2. Establish Energy consumption model of four different types of buildings, which are office building, conference center, shopping mall and hotel. Simulate and calculate their all-year hourly load. Different building types have different load characteristics. According to temperature and humidity independent Control air-conditioning system based on double temperature cold source applies to different building types, analyze load characteristics of year-round, typical season and typical day, calculate and analyze load frequency and operating hours under different load conditions, and then optimize capacity allocation and operation characteristic of refrigerating unit , which provide certain basis for set selection.3. Establish energy consumption model of temperature and humidity independent Control air-conditioning system based on double temperature cold source. The main energy equipments of double temperature cold source air-conditioning system are refrigerating unit, fresh air handling unit, chilled water pump, cooling water pump. And their related model is the energy consumption model of refrigerating unit, fresh air handling unit, chilled water pump, cooling water pump. Only establish energy consumption model of these main components can we better analyze Comprehensive energy conservation of double temperature cold source air-conditioning system.4. In order to evaluate energy conservation of double temperature cold source air-conditioning system betterly, select a project example, then carry on technology and economy analysis and comprehensive energy conservation evaluation of the established energy consumption model of air-conditioning system.