| As economy grows fast in China, nowadays demands for energy become so high, thus leading to an urgent problem - how to put energy consumption unit for GDP in lower level. Meanwhile, it seems a trend that energy conservation for central air-conditioning system in a lot of buildings, particularly in those commercial ones, has been one of hot topics. Relying on its practical concept and successful applications in certain areas, free-cooling system has attracted great attentions from experts in HVAC.Free-cooling system is an energy saving system without chiller operation when the ambient temperature is relatively low and building needs the chilled water for cooling. This paper looked for and collected those researches regarding free-cooling home and abroad, and listed its types and characteristics. It also analyzed and discussed applicable conditions in different cities in China as well as main factors - the ambient wet-bulb temperature and building demands for cooling in off-season and winter. Then, new concept was created as an indicator showing the relationship of cooling demand and supply, and it was also defined as 'cooling demand and supply index' and discussed. In the end a building was simulated to show a picture of this varying index in five cities in China, and to demonstrate the feasibility and economical space of free-cooling system.Finally, real study was executed on free-cooling system in Shanghai Centre Complex throughout year 2006, and a formula was found by simulations to calculate the space of energy savings of free cooling system and was then applied to other cities in China. After that, a further research was made by using the orthogonal design.
|
PDF Full Text Request