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On the measurement of the mean radiant temperature by means of globes: An experimental investigation under black enclosure conditions

机译：通过地球仪测量平均辐射温度：黑色外壳条件下的实验研究

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摘要

Mean radiant temperature is one of the four physical quantities required for the objective assessment of thermal environments. Due to its simplicity and relatively good accuracy, the most common measurement method is the black globe thermometer. Most studies have investigated the effects of diameter on the response time, of globe materials on its accuracy and the heat transfer modelling. Unfortunately, results seem to be inconsistent due to the difficulty of calibrating and metrologically characterizing globe thermometers under uniform black enclosure conditions. Besides, few studies have been focused on the accuracy of small globes that could result in a wrong assessment of the thermal environment. To answer to these open issues, this study will be focused on a metrological analysis of a wide sample of globes (metallic-made and plastic-made with different diameters) carried out in a testing apparatus specifically designed to reproduce a black uniform enclosure whose temperature can be strictly controlled. Obtained results revealed high errors of the mean radiant temperature measurement by tennis-table globes (up to 6 degrees C) which require a specific reformulation of convective heat transfer modelling, and lower response time (3-4 min) of table-tennis globes if compared with large ones (6-9 min).
机译：平均辐射温度是热环境客观评估所需的四种物理量之一。由于其简单性和更好的准确性，最常见的测量方法是黑色地球温度计。大多数研究已经研究了直径对响应时间的影响，以其对其精度和传热建模的响应时间。不幸的是，由于难以在均匀的黑色外壳条件下校准和衡量和造理地球体温计的难度，结果似乎不一致。此外，很少有研究专注于可能导致对热环境进行错误评估的小球的准确性。为了回答这些开放问题，本研究将重点关注在专门设计用于再现温度的黑色均匀外壳的测试设备中进行的宽全球样品（具有不同直径的金属制造和塑性制造）的计量分析可以严格控制。获得的结果揭示了由网球 - 表球（最多6摄氏度）的平均辐射温度测量的高误差，这需要对对流传热建模的特定重新制定，以及桌球地球仪的较低响应时间（3-4分钟）与大型（6-9分钟）相比。

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