Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Heat transfer measurements on transparent building components
Almost each building contains transparent components, e.g. windows, glass components or glass facades. The thermal behaviour of a building depends significantly on the transparent component. These components cause relatively high energy fluxes. High thermal losses (cold climate) or high solar gains (hot climate) can be caused. The heat transfer can be described in consideration of the effects of heat conduction, convection and radiation. But each thermal calculation requires the knowledge of the relevant thermophysical parameters. Many separate parameters can be measured. These are steady state parameters, e.g. the thermal conductivity and the heat capacity or optical properties, e.g. the transmittance, reflectance and emissivity. Due to the dependence on variable boundary conditions the standard measurements have to be modified. In consideration of the measured values the heat transfer coefficient or the solar heat gain factor can be calculated. The paper presents some lab measurements on transparent materials and components. Applied techniques are modified conductivity measurements, heat transfer and radiation measurements. Moreover convection measurements using the Laser-Doppler-Anemometry was carried out. The use of constant parameters is limited and enables only rough estimations of the energy transfer. More detailed calculations demand the consideration of the dynamic effects and dynamic parameters. With measured dynamic parameters the complete heat transfer on buildings and the thermal comfort in the building can be estimated. A special feature of all measurements is the dependence on variable weather and using conditions. Measurements on complete building components or buildings enable the investigation of the resulting heat exchange and energy consumption.
Heat transfer measurements on transparent building components
Almost each building contains transparent components, e.g. windows, glass components or glass facades. The thermal behaviour of a building depends significantly on the transparent component. These components cause relatively high energy fluxes. High thermal losses (cold climate) or high solar gains (hot climate) can be caused. The heat transfer can be described in consideration of the effects of heat conduction, convection and radiation. But each thermal calculation requires the knowledge of the relevant thermophysical parameters. Many separate parameters can be measured. These are steady state parameters, e.g. the thermal conductivity and the heat capacity or optical properties, e.g. the transmittance, reflectance and emissivity. Due to the dependence on variable boundary conditions the standard measurements have to be modified. In consideration of the measured values the heat transfer coefficient or the solar heat gain factor can be calculated. The paper presents some lab measurements on transparent materials and components. Applied techniques are modified conductivity measurements, heat transfer and radiation measurements. Moreover convection measurements using the Laser-Doppler-Anemometry was carried out. The use of constant parameters is limited and enables only rough estimations of the energy transfer. More detailed calculations demand the consideration of the dynamic effects and dynamic parameters. With measured dynamic parameters the complete heat transfer on buildings and the thermal comfort in the building can be estimated. A special feature of all measurements is the dependence on variable weather and using conditions. Measurements on complete building components or buildings enable the investigation of the resulting heat exchange and energy consumption.
Heat transfer measurements on transparent building components
Wärmeübergangsmessungen an lichtdurchlässigen Gebäudekomponenten
Donath, A. (Autor:in)
2005
6 Seiten, 13 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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