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Discussions of Determination Method of Fresh Air Volume to Control Typical Pollutants in Office Buildings

Author: LvChao
Tutor: ZhaoJiaNing
School: Harbin Institute of Technology
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Indoor Air Quality Logarithmic index evaluation method Typical new standard for pollutant concentration Fresh air Survey Numerical Simulation
CLC: TU831
Type: Master's thesis
Year: 2007
Downloads: 181
Quote: 4
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Abstract


In recent years, with the steady improvement of living standards, people are building service-level requirements are increased. People are not satisfied with the building sheltered the functional requirements of the bottom line, and put more eyes on the indoor air quality (IAQ). It has been recognized to address indoor air quality problems of importance and urgency, IAQ problem areas of the built environment has become a hot research topic within. With indoor pollution is worsening, people are looking to air conditioning. The current air conditioning systems tend to focus only on the indoor thermal environment, indoor air quality and rarely consider this factor. This article is from this perspective that the indoor air quality by studying the typical indoor pollutants explore fresh air needed to control these pollutants determination method, so as to truly improve the indoor air quality for this purpose. Because of different building there is a big difference in all respects, so this is only typical office building research. Paper first presents the concept of burden of indoor air quality, noting that the quality of indoor air quality and indoor pollutants are closely related, that the concentration of pollutants to meet the requirements of a reasonable standard, and standards of objective factors to be taken into account and subjective factors. Select the text CO2 and HCHO as a typical office building contaminants logarithmic index evaluation method as an indoor air quality evaluation method, developed a typical pollutant concentrations of CO2 and HCHO new standards. It also developed a different dissatisfaction corresponding standard values ??for designers chosen according to specific circumstances. Currently pollutant concentrations measured value is still relatively small, only a few scholars have been tested. In order to obtain first-hand information for the calculation of the weight of pollutants, but also to the design of future to have more measured data can refer to this article for a certain scale survey. Specific content includes theoretical basis for investigation, survey program design, trial investigation and the results of the official investigation and results analysis. The survey achieved a certain amount of data, through the analysis and processing, to make people learn more about the office buildings in the specific circumstances of the data, the design of the future will have a certain reference value. The airflow organization analyzed, selected as a reasonable displacement ventilation ventilation. Were given fresh air mixing ventilation and displacement ventilation method for determining and checking them, and then derive a direct calculation of fresh air ratio formula, eliminating the need for fresh air first calculate the complex process of re-checking. Through an example is given control of pollutants typical office building displacement ventilation system design and analysis of the specific process. Finally, displacement ventilation cases cited, its CFD simulation validation. By examining the distribution of indoor pollutant concentration, the concentration can be seen to meet the predetermined criteria, that the calculation of fresh air to meet the requirements. In addition, through the air velocity and temperature fields were analyzed to verify the simulation results with the case in good agreement with the calculated results.

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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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