An Intermittent Ventilation Method for Measuring VOC Emission Characteristic Parameters of Building Materials
A technology of characteristic parameters and building materials, which is applied in measurement devices, material separation, and analysis of materials, etc., can solve problems such as calculation errors, and achieve the effect of avoiding random errors, simple calculation process, and high error tolerance.
Active Publication Date: 2020-08-14
XI AN JIAOTONG UNIV
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However, this method involves many process parameters in the emission model and a complex solution process, which is prone to calculation errors; and when fitting the experimental data, it is necessary to verify the validity of the experimental data range, and the results obtained from the experimental data in different ranges are very different.
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] see figure 1 , the emission test of building materials in the present invention is carried out in the environment cabin, and main experimental device comprises:
[0031] (1) Environmental test chamber 1, inner chamber 106 air volume 1m 3 , The air temperature and humidity in the cabin are regulated by the control panel 101, the control temperature range is 10 to 40°C, the relative humidity range is 30%-90%, the temperature accuracy range is ±0.5°C, and the relative humidity accuracy range is ±5%. The gas in the cabin can be sampled and analyzed through the sampling port 102 . The environmental chamber has two operating modes of airtight and ventilated to choose from. In the airtight state, both the air inlet 107 and the air outlet 105 are closed. In a ventilated state, the air intake flow is controlled by the flow meter 103, and the clean air from ...
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Abstract
The invention discloses an intermittent ventilation method of determining a VOC (volatile organic compound) emission characteristic parameter of a building material. The method comprises the steps ofkeeping a space that is relatively constant in temperature, relative humidity, ventilation rate and wind speed by using an environmental chamber, putting the building material to be determined in theenvironmental chamber, determining a dynamic VOC concentration change situation in a closed state and a ventilation state for a building material sample in a closed emission mode and a ventilation emission mode, recording a VOC equilibrium concentration in each closed state, and exhausted VOC mass in the ventilation state, establishing a VOC mass conservation equation, substituting experimental data of 4-6 closed-ventilation emission cycles into the VOC mass conservation equation for linear fitting, and obtaining a separation factor and an initial emission concentration describing a VOC emission characteristic of the building material according to a slope and an intercept of a fitting straight line, wherein the ventilation state and the closed state of the environmental chamber can be switched over by opening and closing an air inlet and an exhaust outlet.
Description
technical field [0001] The invention belongs to the field of indoor environmental quality detection, in particular to an intermittent ventilation method for measuring VOC emission characteristic parameters of building materials in artificial boards such as particle boards and density boards. Background technique [0002] Clean air is the basic condition for human survival. Human beings spend most of their time in indoor environments such as residences, offices, and classrooms, and the indoor air quality in these buildings is closely related to the health of the human body. The requirements for interior decoration in modern buildings are increasing day by day, and the extensive use of decoration and decoration materials leads to excessive emission of indoor harmful substances; concentration in the air. As the main source of indoor chemical pollution, volatile organic compounds (VOC) are widely present in various decorative building materials. Compared with outdoor air poll...
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IPC IPC(8): G01N30/88G01D21/02
CPCG01D21/02G01N30/88G01N2030/884
Inventor 周晓骏王新轲王沣浩
Owner XI AN JIAOTONG UNIV