Design And Experimental Study Of Cold Air Diffuser Of Ice Storage & Cold Air Distribution Systems

In recent twenty years, domestic economic in China has developed rapidly due to reform and open-up. With the development of city's modernization and improvement of people's living conditions, more and more buildings equipped with air conditioning systems have emerged in big and medium scale cities all around China. City's electric power supply network has taken heavy burden when air conditioning systems load increases quickly. Furthermore, the imbalanced phenomenon of using electric power becomes evidently especially between peak and valley time. Under this background, ice storage technology which can reduce this kind of phenomenon effectively is developed gradually. The initial cost of "pure" ice storage air conditioning systems was higher than the initial cost of conventional systems, but it can be reduced by using low temperature air supply technology , and the first cost even maybe lower than the first cost of conventional systems. Today this new technology is restricted in China , one of the main reason is because of high costs of terminal units imported from other countries, and it influences the owner's enthusiasm of using the new technology. Therefore, it has important meaning to introduce in and digest the present cold air diffuser products from foreign countries and do some research on it.This paper reviews the historical developments of ice storage & cold air distribution technologies and recent situation of using this technology in some developed countries, and also introduces the movement rule and parameter numeration of air flows. Some questions in cold air distribution systems are discussed and will be considered in designing cold air diffusers. Refer to the present cold air diffuser products from foreign countries, we designed some diffusers, and also made a set of detailed experimental scheme. Ice storage & cold air distribution systems lab was built according to the requirements of low temperature air supply. Experimental study on cold air diffusers has been done, and the experimental data was analyzed. The results show that this kind of cold air diffuser can meet the requirements of low temperature air supply.Finally experimental study on cold air diffuser is summarized, and some suggestions to further study is also given in this paper.