Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
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Hirn, T., Kirmas, A., Backes, D., & Eckstein, L. (2021). The influence of radiation intensity and wavelength on thermal perception. Building and Environment, 196, 107763. Added by: Sarina (2025-05-24 08:06:24) Last edited by: Sarina (2025-06-06 11:34:34) |
| Resource type: Journal Article DOI: https://doi.org/10.1016/j.buildenv.2021.107763 ID no. (ISBN etc.): 0360-1323 BibTeX citation key: Hirn2021 View all bibliographic details  |
Categories: Englisch = English Keywords: Infrarot = Infrared, Thermoregulation = Thermoregulation Creators: Backes, Eckstein, Hirn, Kirmas Collection: Building and Environment |
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Meine Sichtweise (Keine vollständige Zusammenfassung des Artikels! Meine Meinung muss nicht mit der Meinung der Autoren übereinstimmen! Bitte lesen Sie auch die Originalarbeit!)
Im Labor wurden 29 sitzende Menschen von vorne mit 4 Halogenlampen (IRA) oder 5 Keramikplatten (IRC) bestrahlt. Der Versuch wurde mit drei verschiedenen Bestrahlungsstärken (0 W/m², 100 W/m², 200 W/m²) und zwei verschiedenen Lufttemperaturen (16 °C und 22 °C) durchgeführt. Die Menschen gaben ihre Temperaturmepfindung (-3 kalt bis +3 heiß) und ihren Wärmekomfort (1 sehr unkomfortabel bis 10 sehr komfortable) an. IRC-Strahlung wurde als deutlich wärmer wahrgenommen als IRA-Strahlung. Added by: Sarina |
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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.
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Fig. 1 illustrates that human skin reflects between 30% and 70% of incident short-wave radiation (IR-A radiation with 𝜆 = 0.78 μm to 1.4 μm, and also visible light). In contrast, for long-wave radiation (IR-C type with 𝜆 ≥ 3 μm) the skin’s reflectance is typically below 10% [11– 14]. Similar observations were made for typical cotton clothing, which hardly absorbs and rather reflects short-wave radiation [15]. As for instance sunlight largely consist of short-wave radiation, the practical significance of these considerations becomes clear. Added by: Sarina Keywords: Infrared Radiation Spectral composition Thermoregulation = Thermoregulation Wavelength |