Method for determining diffusion coefficient and distribution coefficient of sink material

A technology of diffusion coefficient and distribution coefficient, applied in the field of indoor environment inspection, can solve the problems of low test accuracy, multiple model solutions, long test time, etc.

CN111829927AInactive Publication Date: 2020-10-27BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of indoor environment inspection and particularly relates to a method for determining a diffusion coefficient and a distribution coefficient of volatile organic compounds (VOC) in an indoor sink material. The determination method comprises the following steps of establishing an absorption physical model; putting a to-be-detected sink material into the direct-current cabin, introducing VOC gas with constant concentration to carry out an absorption experiment, and measuring the gas concentration of the direct-current cabin at different time; and performing linear fitting on experimental data according to the absorption model to solve a diffusion coefficient, a distribution coefficient and the like. The method is simple in test and short in experimental period, a problem of multiple solutions is avoided through linear fitting, two absorption key parameters of the diffusion coefficient and the distribution coefficient can be measured at the sametime only through one absorption process, and the method is more reliable and convenient compared with a traditional method.
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Description

[0001] Technical field

[0002] The invention belongs to the technical field of indoor environment inspection, and particularly relates to the measurement of the diffusion coefficient and distribution coefficient of volatile organic compounds (VOC) in indoor sink materials. Background technique

[0003] Volatile organic compounds (VOC) released from materials such as indoor building materials and furniture are one of the important reasons for poor indoor air quality, and significantly affect people's health, living comfort and work efficiency. When the indoor VOC concentration is higher than the VOC concentration on the surface of the material, the material begins to absorb VOC, which is called a sink material. Typical indoor sink materials are carpets, ceilings, etc. When the original pollution source is moved out of the room or the ventilation rate increases, the concentration of VOC in the indoor air will decrease. At this time, the sink material will re-release the adsorbe...

Examples

Embodiment Construction

[0018] The method proposed by the present invention can quickly and accurately measure the VOC diffusion coefficient D in the sink material m and distribution coefficient K are two key adsorption parameters. The method is described in detail in conjunction with the accompanying drawings and examples as follows:

[0019] Experimental test systems such as figure 1 As shown, the sink material 4 to be tested is placed in the direct flow chamber 5. During the experiment, the VOC gas 1 with a constant concentration is mixed with the pure air 3 through the valve 2, and then passes into the direct flow chamber 5, and is absorbed by the sink material 4 in the environmental chamber 5. After the process, it is discharged from the air outlet 7, and 6 is a control chamber, which is used to control the temperature and relative humidity of the direct current cabin 5; the direct current cabin used in the experiment is a 50L stainless steel rectangular cabin designed in accordance with the AST...