Application of infrared thermography in the evaluation of indoor non-uniform thermal environment
To evaluate the indoor thermal environment,the spatial distribution of mean radiation temperature and wet-bulb globe temperature(tWBG)were explored.The reliability of infrared thermography in calculating the spatial mean radiation temperature was verified by measuring the indoor air temperature,humidity,wind speed,black globe temperature,and surface temperature under the conditions of radiant heat source and room temperature.Combined with Python digital images,a visualization method of thermal environment spatial evaluation results was designed,and the spatial distribution of mean radiation temperature and tWBG under different conditions were studied.The results show that a 95％confidence interval of the difference is 0.61-0.89 ℃ for P1 and 0.50-0.69 ℃ for P2 when there is a radiant heat source in the room.The 95％confidence interval of the difference is 1.36-1.45 ℃ for P1 and 1.23-1.46 ℃ for P2 at room temperature.The difference between the infrared thermography method and the black globe method is within 2 ℃ under different conditions.The infrared thermal imaging method has high reliability in calculating the mean radiation temperature.The spatial variation of mean radiation temperature,air temperature and tWBG is similar.The radiant heat source is directly opposite the center of the room,and the tWBG is the largest in the center of the space.At room temperature,the tWBG on the left side of space is higher than the right due to the influence of solar radiation.When there is a radiant heat source in the room,the spatial difference of the indoor thermal environment at the same time is the largest,the spatial difference of the mean radiation temperature is 6.4 ℃,the air temperature is 4.8 ℃ and the tWBG is 3.9 ℃.This study can provide a reference for the spatial evaluation of the indoor thermal environment of buildings.
safety and hygiene engineering technologyinfrared thermographymean radiation temperaturewet-bulb globe temperature
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