Thermal radiation is considered a fundamental factor of human thermal perception, however the effect of specific radiation spectra has not yet been explored comprehensively. This study investigates the influence of different radiation types, short-wave infrared A and long-wave infrared C radiation, on thermal sensation and thermal comfort. 29 participants were exposed to these two radiation types at two irradiance levels, 100 W/m² and 200 W/m², and at two air temperatures, 16 °C and 22 °C. The results confirm the well-established observation that additional irradiation induces a warmer thermal sensation. For an otherwise cold environment, a certain level of irradiation did also improve thermal comfort. When it comes to moderate thermal environments, we found that comparable amounts of infrared C irradiation are perceived substantially warmer than their infrared A counterparts. This significant outcome can potentially be explained by the radiative properties of human skin, which greatly depend on the irradiation spectrum. Current thermal perception models do not fully account for such differences. Thereby our findings contribute to a better understanding of thermal perception in environments as buildings or outdoors.

热辐射被认为是人类热感知的基本因素，但是具体辐射光谱的影响尚未得到全面研究。本研究调查了不同辐射类型（短波红外A和长波红外C辐射）对热感和热舒适性的影响。29名参与者分别以100 W / m ²和200 W / m ^2的两个辐射水平暴露于这两种辐射类型，并且在两个空气温度分别为16°C和22°C的情况下。结果证实了公认的观察，即额外的辐射会引起较热的热感觉。对于否则为寒冷的环境，一定程度的辐射也确实改善了热舒适性。当涉及中等温度环境时，我们发现相当数量的红外C辐射被认为比其红外A辐射要温暖得多。人体皮肤的辐射特性可能很大程度上解释了这一重要结果，而辐射特性在很大程度上取决于辐射光谱。当前的热感知模型不能完全解决这种差异。因此，我们的发现有助于更好地理解建筑物或室外环境中的热感知。