Analysis Of The Displacement Ventilation And Its Application In Engineering

With the continuous development of air-conditioning technology, energy saving and indoor air quality requirements, many energy-saving air-conditioning ways apply to the actual use of the project, the displacement ventilation air-conditioning system with cooling ceiling is an important one. The displacement ventilation air-conditioning system with cooling ceiling is not only to improve the indoor air quality but also to enhance the body's thermal comfort and reduce energy consumption, save energy costs.Firstly this paper describes the domestic and international situation and development of the displacement ventilation, cooling ceiling and problems in engineering's application, and then analyzes the theory, the principles of performance and impact factors of the displacement ventilation air-conditioning system with cooling ceiling, and summed up the cooling ceiling's calculation formula. Finally, it describes the design principle of the displacement ventilation air-conditioning system with cooling ceiling by a project. it analyzes and resolves the design difficulties and draws the important conclusions.It will be a very good reference in other works'Application for the displacement ventilation air-conditioning system with cooling ceiling in the future. This paper works from the theoretical analysis on how to best distribute the cooling load of the displacement ventilation air-conditioning system with cooling ceiling, how to control the supply cooling water temperature preventing from condensation .The results show that the cooling load of the cooling ceiling accounts for 75 percent share of the indoor cooling load is more appropriate in engineering. To the comfort air conditioning, when its summer indoor temperature and humidity are 25℃, 60%, the supply cooling water's temperature of the cooling ceiling must be above 16℃, otherwise it will cause condensation.The displacement ventilation air-conditioning system with cooling ceiling is an effective and energy saving air-conditioning mode. In China it is very promising.I hope I can provide some useful information for the displacement ventilation air-conditioning system with cooling ceiling in the development of air-conditioning industry in China.