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Xi'an atmospheric environment on the air conditioning system air filter The Selection

Author: WangJingZuo
Tutor: FanYueSheng
School: Xi'an University of Architecture and Technology
Course: Heating, Gas Supply , Ventilation and Air Conditioning Engineering
Keywords: Dust concentration Filter Airflow
CLC: TU831.3
Type: Master's thesis
Year: 2009
Downloads: 49
Quote: 0
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Abstract


As people's living standards improve, the indoor air quality requirements are also getting higher and higher, the state has introduced a related standards, air quality regulations in public places: indoor air PM 1 0 daily average ≤ 0.15mg / m 3 ; central air conditioning ventilation system air PM 1 0 lt; 0.08 mg / m 3 . Use indoor and outdoor air filtration equipment filtration of particulate contaminants are the most effective way, while building and air conditioning systems can reduce maintenance and cleaning costs. However, the current domestic public buildings air conditioning system design and selection of the filter does not explicitly refer to the normative basis or through data discovery domestic provinces and air-conditioning systems in public buildings lower prevalence of filtration efficiency, indoor pollutant concentrations reach standards, causing discomfort, decreased work efficiency, resulting in economic losses. In this paper, Yanta Road during a certain period in 2007.10-2008.9 dust concentration and size distribution were tested and analyzed. Measured have Yanta Road ATMOSPHERE PM 1 0 annual daily average concentrations ranged O.119-0.408mg / m 3 , PM 1 < / sub> 0 annual daily average mean 0.237mg / m 3 , 1.58 times more than the national secondary standard, the air quality is slightly polluted. By measuring the distribution of the dust of the road, outside of the region to grasp the distribution of atmospheric dust on the air conditioning system air filter design selection, made the selection of reference: European Standard EN779 selection of G 3 (800% -90%) as the new minimum standards for air filters; taking into account the efficiency of the adjacent two filters that much difference, before a filter would not achieve a protective effect on the post, select European standards EN779 The F5 (40% -60%) in the first paragraph as a mixed stage filter, clean if higher, the selection of European Standard EN779 F6 (60% -80%) as a mixture of two filter sections, in select at least two filters to achieve the standard. While the air conditioning system for three-dimensional flow mixing section numerical simulation, analysis into the filter at the front section of the airflow distribution. Ventilation and air conditioning systems in the organization of air mixing section affect filter efficiency is an important factor to simulate three kinds of return air and fresh air are mixed combinations of airflow distribution segment, numerical simulation results show that the return air inlet located on the side, the airflow Tissue distribution more uniform velocity distribution is uniform. For this project, Xi'an outdoor air pollution particulate matter, taking into account the prevalence of domestic civil filters installed substandard problem of low efficiency, air conditioning and ventilation systems to bring secondary pollution problem, the filter Design and Selection conduct research.

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