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Thermal Comfort Study of an under-Floor Air-Conditioning Room

Author: LiuChengBo
Tutor: ZhaoJingDe
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: under floor air distribution system thermal comfort numerical simulation human thermal equilibrium
CLC: TU831
Type: Master's thesis
Year: 2012
Downloads: 117
Quote: 0
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Abstract

Since 1990s, humans have already facing a serious shortage of resources. Saving energy has already become the focus in countries around the world. In energy consumption, buildings section is the main energy consumer, among which air conditioning system is up to 60%～70%. There-fore, to save energy, the prospect of energy efficiency of air conditioning is very broad. In addition, as people’s indoor retention time increase gradually, indoor air quality is directly related to the personnel health and work efficiency. Sick building syndrome caused by the bad indoor ventila-tion has aroused wide attention of all social sectors, so the improvement of the indoor air quality (IAQ) has become one of the problems which should be solved in air conditioning system. For the most buildings, the design standards of air conditioning system are still provide a single, homoge-nous thermal environment and ventilated environment for all areas of the building, which have little opportunity to meet each occupant on thermal environment needs and preferences. Although the traditional air conditioning system with upper air supply, can satisfy the requirements of in-door temperature and humidity, it can not provide better indoor air quality and consume more en-ergy. Under-floor air distribution system has been used more and more widely in office buildings because of its superiority of flexibility, energy saving, lower investment, improvement of comfort and health, and satisfaction with individual requirement of local thermal environment control.First, a review on the application and development of under-floor air condition system has been carried in this paper. Then an office room with under-floor air condition has been simulated to learn the indoor temperature field, velocity field and thermal comfort in the circumstances of under floor air distribution. Meanwhile, according to the thermal equilibrium and human physio-logical temperature regulation model, the heat dissipation of human body to environment in under floor air distribution room has been calculated using the thermal equilibrium equation of human body. And the analysis on human thermal comfort has been analyzed at the view point of human physiology. And the results have been compared with some thermal comfort standards, such as PMV. Through the simulation and analysis, when human feel the most comfortable in under floor air distribution room, parameters such as air temperature, air velocity and air supply volume have been obtained. The conclusion of this paper can provide theoretical guidance for the design and the popularizing in China of the under floor air distribution system.

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