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Study on Indoor Air Quality of Impinging Jet Ventilation System

Author: YeMeiZhen
Tutor: KangYanMing
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Collision jet ventilation Underfloor Air Ventilation efficiency Numerical Simulation Hair flu
CLC: TU831
Type: Master's thesis
Year: 2010
Downloads: 67
Quote: 1
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Abstract


In recent years, with the air conditioning is becoming increasingly popular in a variety of building the application, the air-conditioned indoor environmental issues have become increasingly prominent, as the impact on indoor air quality ventilation caused widespread concern. The different ventilation of indoor air quality is very different. At present, the more commonly used ventilation mixing ventilation, displacement ventilation, underfloor air supply. Ventilation method which was first developed for mixing ventilation, indoor air flow is more uniform, however, the temperature stratification is not obvious, the indoor air quality is poor, could easily lead to sick building syndrome. Follow the development of the displacement ventilation, indoor air quality has been some improvement, but lower flow velocity of this ventilation mode, it is difficult to meet winter heating demand, and the need to create additional equipment for winter heating, therefore increase the initial investment of the air-conditioning system. Floor air supply is also a newly developed better ventilation, air displacement ventilation is similar, but it is easy to cause ground dust. In recent years, a new air conditioning in Sweden - collision jet ventilation system. The study, which combines the advantages of mixing ventilation and displacement ventilation, at the same time meet winter heating, is a relatively new type of ventilation. On the basis of previous studies, using fluent simulation software to simulate conditions in variable air volume and constant air volume collision jet ventilation systems and underfloor air distribution system, two air supply indoor airflow, temperature, analyzed in detail and compare simulation results of the pollutant concentration and ventilation efficiency, comfort and other factors further investigated indoor air quality and comfort. The results indicate that the variable air volume system under load from low to high, and two air supply indoor air flow gradually into mixing ventilation in the form of displacement ventilation. Compared with Underfloor Air collision jet ventilation indoor discharge carbon dioxide is less efficient, discharge benzene efficiency is higher; collision jet ventilation indoors near a vent at the hair feeling strong. Constant air volume systems, the higher the load, the two blast indoor airflow is more nearly in the form of displacement ventilation. The situation is similar in the two air supply capacity and variable air volume systems that emit carbon dioxide and benzene, indoor Hair sense of the two kinds of air supply, however, are small, and not very different.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning
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