Method and device for quickly measuring building material emission key parameter

Abstract

The invention relates to a method and device for quickly measuring a building material emission key parameter, belonging to the field of indoor environmental tests. The method comprises the following steps: building an effect model for concentration in the measuring device in the building material VOC (volatile organic compounds) emission process; controlling the temperature of the measuring device to be always kept at a set value by a temperature controlling device (such as a constant-temperature water bath); putting a building material to be measured into the measuring device, and sealing the measuring device; in the building material emission process, measuring the concentration of target VOC in the measuring device for several times; finally, taking the average value of the concentration results of the last 2-3 times as a balanced concentration, and taking other concentration results as a hourly concentration; tidying into the mode of logarithm; and then, carrying out linear fit for emission time to obtain a slope and an intercept so as to obtain three key parameters, i.e. initial concentration, diffusion coefficient and distribution coefficient in the building material emission process. The environmental chamber system and the measuring method are simple, have the advantages of short test time and higher precision and are convenient for engineering application.

Description

technical field [0001] The invention belongs to the field of indoor environment inspection, and in particular relates to a method for quickly measuring key parameters of VOC emission in building materials such as medium-density boards, high-density boards, particle boards, and large-core boards, and an environmental chamber system thereof. Background technique [0002] In recent years, with the rapid development of the economy, the number of new buildings has increased continuously, and the wide use of various building materials in buildings has led to increasingly serious indoor air quality problems, which have attracted more and more attention. Humans spend about 87% of their time indoors, and indoor air quality will significantly affect people's health, comfort and work efficiency. There are many factors that affect indoor air quality, and the high concentration of indoor volatile organic compounds (VOC) is one of the main reasons for poor indoor air quality. Indoors, VO...

AI Technical Summary

Problems solved by technology

This method has some disadvantages: the experimental system is complex; the concentration gradually decreases during the experiment, and the sampling accuracy and frequency of VOC will affect the cumulative result of the concentration; the building material is ground into powder during the experiment, which destroys the inherent structure of the building material

This method also has the following defects: the test state of the building material is inconsistent with the use state; the experiment takes a long time, usually 4 weeks, which is not convenient for engineering application

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