Abstract The thermal environment is a major factor affecting workers’ health and productivity. Its influence is more evident in environments with high temperatures and humidity accompanied by high thermal radiation. Thus, it is important to understand human response and productivity in hot environments with directed thermal radiation (DTR) in order to improve the working conditions and protect laborers. Therefore, studies on environments involving high temperatures and humidity with DTR should be emphasized. In this regard, an experiment to investigate the effect of DTR and labor intensity on human bodies was conducted in a climate chamber, and three radiation intensities (0.0 kW/m2, 1.0 kW/m2, 2.0 kW/m2) and two labor intensities (4.5 km/h, 6.0 km/h) were selected as experimental conditions. Physiological parameters (core temperature, skin temperature, heart rate and sweat loss) and psychological parameters (comprehensive thermal sensation and fatigue feeling) of 30 subjects were collected during the experiment. Paired t-test and analysis of variance (ANOVA) were used to analyze the corresponding experimental data. The results of this study indicated that most of human physiological parameters and subjective feelings are affected by temperature and humidity, and also by DTR and labor intensity. Specifically, high-intensity radiation significantly affects oral temperature, skin temperature, heat rate, and sweat loss. However, labor has no effect on skin temperature. Furthermore, this study shows that physical productivity is affected by labor and high-intensity radiation. However, mental productivity is solely affected by radiation. These results are expected to serve as preliminary data supporting the establishment of reasonable working times and intensity as well as the control of working environment.

中文翻译：

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具有定向热辐射的炎热环境中的人类反应和生产力

摘要 热环境是影响工人健康和生产力的主要因素。在高温高湿伴有高热辐射的环境中，其影响更为明显。因此，了解人类在具有定向热辐射 (DTR) 的炎热环境中的反应和生产力非常重要，以改善工作条件并保护劳动者。因此，应重视使用 DTR 对涉及高温和潮湿环境的研究。对此，在气候室中进行了研究DTR和劳动强度对人体影响的实验，三种辐射强度（0.0 kW/m2、1.0 kW/m2、2.0 kW/m2）和两种劳动强度（ 4.5 公里/小时，6.0 公里/小时）被选为实验条件。生理参数（核心体温、实验过程中收集了 30 名受试者的皮肤温度、心率和出汗量）和心理参数（综合热感和疲劳感）。配对t检验和方差分析（ANOVA）用于分析相应的实验数据。本研究结果表明，人体大部分生理参数和主观感受受温度和湿度的影响，也受DTR和劳动强度的影响。具体而言，高强度辐射显着影响口腔温度、皮肤温度、发热率和汗液流失。但是，分娩对皮肤温度没有影响。此外，这项研究表明，体力生产力受到劳动和高强度辐射的影响。然而，脑力生产力仅受辐射影响。