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Research on Methods in Comprehensive Performance Evaluation of Photocatalytic Indoor Air Cleaners

Author: ZhangYiQing
Tutor: ZhangYinPing
School: Tsinghua University
Course: Civil Engineering
Keywords: Indoor Air Quality Volatile organic compounds Photocatalytic purifier The purification efficiency
CLC: TU834.84
Type: Master's thesis
Year: 2010
Downloads: 229
Quote: 0
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Abstract


In recent years, the IAQ (Indoor Air Quality IAQ) more and more attention, and the main reason for the poor indoor air quality caused by indoor large number of volatile organic compounds (Volatile Organic Compounds, or VOCs). Photocatalytic indoor air purifier to remove indoor VOCs is a very potential technical means, but the variety and efficiency, even in the application process may produce byproducts harmful to human health. In the actual environmental conditions for photocatalytic degradation of multi-component few studies of indoor VOCs, and the lack of taking into account the byproducts of human health effects, including the evaluation criteria or norms, thereby constraining the objective evaluation and successful application of the technology. Carried out photocatalytic purifier close to the indoor environment under the conditions of test and evaluation studies, the main academic contribution: in an environmental chamber to simulate the actual conditions of indoor air, the attenuation method (pull-down method) At present, China mainly indoor pollutants such as formaldehyde, benzene, toluene, etc. under different initial conditions photocatalytic purifier Degradation of single-component or multi-component test VOCs. Using proton transfer reaction mass spectrometry gas analyzer (Proton Transfer Reaction Mass Spectrometer, PTR-MS) and gas chromatography / mass spectrometry (Gas Chromatograph / Mass spectroscopy, GC-MS), a combination of methods to study the degradation of VOCs and byproducts conversion. Compared with the results of the photocatalytic degradation of pollutants monocomponent Document photocatalytic purifier its degradation byproducts of the generation rate is higher, and more types coexist in multicomponent VOCs. Wherein the butadiene and acrolein the gas byproducts have not yet been reported in the literature. The tests show that the competitive adsorption of water vapor concentration and multi-component VOCs is an important factor to affect the photocatalytic degradation of VOCs. Photocatalytic degradation of VOCs in the efficiency and byproducts conversion rate there is a different optimal concentration of water vapor, this optimum concentration is different for the different components of VOCs. Further, in the test of this article, the relative humidity between 25-80%, the photocatalytic degradation of multicomponent byproduct of the conversion rate of the VOCs are positively correlated with the concentration of water vapor. Interpretation of the mechanism of water vapor concentration on the photocatalytic degradation of the multi-component VOCs. Application of health-related impact factor HRI the test results are analyzed and compared, and to consider the health effects of overall performance rating index (Overall Performance Evaluation, OPE), it is determined by the purification performance ηPCO and HRI. Based on this analysis and summarizes the characteristics of the photocatalytic purifier products, combined with the results of this test class light catalytic converter in the practical application of the applicable environment and conditions for photocatalytic indoor air purifier identification and The evaluation of an experimental basis.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Ventilation, dust,air purification,dehumidification > Air purification > Air purification equipment
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