Standard distribution sample for detecting comprehensive performance of environmental chamber and detection method thereof

Abstract

The invention relates to a standard distribution sample for detecting comprehensive performance of an environmental chamber and a detection method thereof and belongs to the field of indoor environment detection. The sample comprises a polytetrafluoroethylene cylindrical container of which the upper end is opened, organic volatile matter VOC liquid accommodated in the container, a barrier layer arranged on the upper end face of the cylindrical container and a sealing device fixing the barrier layer. The method comprises the following steps of: establishing a model; measuring the ventilation rate of the environmental chamber to be detected; placing the sample in the environmental chamber to be detected, placing the sample on an electronic balance, and recording the mass change of the standard distribution sample in real time; when the environmental chamber is in a sealed state, distributing the VOC liquid in the cylindrical container, calculating a distribution rate with the model according to the mass change, and calculating VOC concentration in the environmental chamber; acquiring the VOC concentration at an outlet of the environmental chamber in real time; and comparing the measured value and the calculated value of the VOC concentration to evaluate the comprehensive performance of the environmental chamber. The standard distribution sample and the detection method for the standard distribution sample have the advantages of simpleness and convenience, easy operation and relatively high precision and reliability.

Description

technical field [0001] The invention belongs to the field of indoor environmental inspection, and in particular relates to a liquid-membrane type standard emission sample for calibrating the release rate of organic volatiles and its detection, which are used to detect the airtightness of the cabin body of the indoor environmental cabin, the uniformity of airflow mixing, and the adsorption of the wall surface. method. Background technique [0002] In recent years, with the improvement of people's living standards, indoor air quality has received more and more attention. Indoor air pollution has a great impact on indoor air quality, thereby affecting people's comfort, health 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 and sick building syndrome. Indoors, VOC mainly comes from the emission of various decorative materials....

AI Technical Summary

Problems solved by technology

However, this method is greatly affected by convection and diffusion, so the speed of the fan in the environmental chamber needs to be controlled. When the wind speed at the glass nozzle fluctuates, the accuracy of the standard distribution of samples needs to be improved.

Moreover, the model describing the indoor VOC concentration needs to be solved by programming iteratively, which is not convenient for engineering promotion and application.

Images