Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermally-responsive film
The present invention relates to a thermally-responsive film that may, for example, be affixed to an exterior surface of a building to help control its temperature as it is exposed to the sun. The thermally-responsive film has a continuous phase and a discontinuous phase. The discontinuous phase comprises a plurality of droplets, each of which comprises the light-absorbing suspending fluid and the light-reflecting particles. The light-reflecting particles are dispersed in a vehicle that is either a second fluid that is immiscible with the suspending fluid and has a higher volumetric coefficient of thermal expansion than the suspending fluid, or a combination of materials that together have a higher volumetric coefficient of thermal expansion than the suspending fluid that together with the light-reflecting particles form composite particles. At temperatures lower than a threshold temperature, the vehicle containing the light-reflecting particles has a higher density than the suspending fluid and sinks towards the rear surface of the film, so that incident light is absorbed. At temperatures higher than the threshold temperature, the vehicle containing the light-reflecting particles has a lower density than the suspending fluid and moves towards the front surface of the film, enabling the light-reflecting particles to reflect incident light.
Thermally-responsive film
The present invention relates to a thermally-responsive film that may, for example, be affixed to an exterior surface of a building to help control its temperature as it is exposed to the sun. The thermally-responsive film has a continuous phase and a discontinuous phase. The discontinuous phase comprises a plurality of droplets, each of which comprises the light-absorbing suspending fluid and the light-reflecting particles. The light-reflecting particles are dispersed in a vehicle that is either a second fluid that is immiscible with the suspending fluid and has a higher volumetric coefficient of thermal expansion than the suspending fluid, or a combination of materials that together have a higher volumetric coefficient of thermal expansion than the suspending fluid that together with the light-reflecting particles form composite particles. At temperatures lower than a threshold temperature, the vehicle containing the light-reflecting particles has a higher density than the suspending fluid and sinks towards the rear surface of the film, so that incident light is absorbed. At temperatures higher than the threshold temperature, the vehicle containing the light-reflecting particles has a lower density than the suspending fluid and moves towards the front surface of the film, enabling the light-reflecting particles to reflect incident light.
Thermally-responsive film
HARRIS GEORGE G (Autor:in) / SAINIS SUNIL KRISHNA (Autor:in)
29.11.2016
Patent
Elektronische Ressource
Englisch
IPC:
E04B
Allgemeine Baukonstruktionen
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GENERAL BUILDING CONSTRUCTIONS
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G02F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING,...
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Vorrichtungen oder Anordnungen, deren optische Arbeitsweise durch Änderung der optischen Eigenschaften des Mediums der Vorrichtungen oder Anordnungen geändert wird zum Steuern der Intensität, Farbe, Phase, Polarisation oder der Richtung von...
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