红外热成像技术在室内非均匀热环境评价中的应用研究

Application of infrared thermography in the evaluation of indoor non-uniform thermal environment

为了对室内热环境进行空间评价,探究平均辐射温度与湿球黑球温度(t_(WBG))的空间分布规律,通过对存在辐射热源与室温两种工况下的室内空气温度、相对湿度、风速、黑球温度、表面温度进行测试,考察红外热成像法计算空间平均辐射温度的可靠性,并结合Python数字图像设计一种热环境空间评价结果的可视化方法,研究存在辐射源与室温两种工况平均辐射温度与t_(WBG)的空间分布规律。结果显示:不同工况下红外热成像法与黑球法的差异均在2℃以内,红外热成像法计算平均辐射温度具有较高的可靠性。平均辐射温度、空气温度、t_(WBG)的空间变化规律相似,当室内存在辐射热源时平均辐射温度的空间差异为6.4℃,t_(WBG)的空间差异为3.9℃。研究结果可以为室内热环境的空间评价提供参考。

To evaluate the indoor thermal environment,the spatial distribution of mean radiation temperature and wet-bulb globe temperature(t_(WBG))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 t_(WBG) under different conditions were studied.The results show that a 95%confidence interval of the difference is 0.610.89℃for P1 and 0.500.69℃for P2 when there is a radiant heat source in the room.The 95%confidence interval of the difference is 1.361.45℃for P1 and 1.231.46℃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 t_(WBG) is similar.The radiant heat source is directly opposite the center of the room,and the t_(WBG) is the largest in the center of the space.At room temperature,the t_(WBG) 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 t_(WBG) is 3.9℃.This study can provide a reference for the spatial evaluation of the indoor thermal environment of buildings.