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Thermal comfort modeling in transient conditions using real-time local body temperature extraction with a thermographic camera

机译：瞬态条件下的热舒适性建模，使用热像仪实时提取局部体温

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This work evaluated the use of thermographic cameras as a non-invasive method to automatically model human thermal comfort in transient conditions, using data from 30 healthy subjects tested in an office setup with ambient temperatures between 21.11 degrees C and 27.78 degrees C. Office temperature, relative humidity, exposed skin temperature and clothing temperature were automatically measured over approximately 27 min per subject, using remote sensors and avoiding any contact with the subjects. Thermal comfort levels were evaluated using subjects feedback, recorded every minute for the entire experiment. Clothing insulation and metabolic rate were kept relatively constant for this experiment (0.54 do and 1.1 met). Average skin temperature was extracted from five different locations, with average temperatures of 33.5 degrees C, 34.5 degrees C, and 35.6 degrees C corresponding to cold discomfort, comfort and warm discomfort respectively. Average clothing temperature was also extracted from three different location, with 32.3 degrees C, 33.8 degrees C and 35.0 degrees C corresponding to the same three comfort levels. Relative humidity levels were similar for all subjects, with average values between 38% and 33%. Results showed significant correlation between observed skin temperature, clothing temperature and thermal comfort level. Also, collected data showed that the temperature difference between different body locations was highly correlated with thermal comfort, and the variance of skin temperature over a small area was significantly correlated with thermal comfort. The results suggest that non-invasive thermographic cameras that combine visual and thermal modes are sufficiently accurate in real-world settings to drive control of HVAC systems.
机译：这项工作评估了热成像相机作为一种非侵入性方法的使用情况，该方法使用在办公室环境中在21.11摄氏度至27.78摄氏度之间进行测试的30位健康受试者的数据，在瞬态条件下自动模拟人类的热舒适度。相对湿度，暴露的皮肤温度和衣服温度是在每个受试者大约27分钟内自动测量的，使用遥感器，避免与受试者接触。使用受试者反馈评估热舒适水平，并在整个实验中每分钟记录一次。在该实验中，衣服的隔热性和代谢率保持相对恒定（0.54 do和1.1 met）。从五个不同的位置提取平均皮肤温度，平均温度分别为33.5摄氏度，34.5摄氏度和35.6摄氏度，分别对应于寒冷不适，舒适度和温暖不适。还从三个不同的位置提取了平均衣物温度，其中32.3摄氏度，33.8摄氏度和35.0摄氏度对应于相同的三个舒适度。所有受试者的相对湿度水平相似，平均值在38％至33％之间。结果显示，观察到的皮肤温度，衣服温度和热舒适度之间存在显着相关性。另外，收集的数据表明，不同身体部位之间的温度差与热舒适度高度相关，而小区域皮肤温度的变化与热舒适度显着相关。结果表明，结合了可视模式和热模式的非侵入式热像仪在实际设置中足够准确，可以驱动HVAC系统的控制。

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