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Nuevo revestimiento selectivo solar estable en el aire a alta temperatura para colectores de energía solar concentrada

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOES20170418004
Publicado:
10/05/2017
Caducidad:
10/05/2018
Resumen:
Un instituto de investigación español ha desarrollado un nuevo revestimiento selectivo solar, un componente indispensable en colectores de energía concentrada. Esta material tiene una capa absorbente selectiva de radiación y propiedades ópticas destacadas. El material es estable en el aire hasta 700º C y permite obtener una eficiencia mucho mayor que la conseguida con los revestimientos actuales (550º C). El revestimiento se basa en una estructura absorbente visible compuesta por dos películas de un material híbrido de siliciuro-nitruro o cermet y una capa dieléctrica antirreflectante hecha de un óxido. El centro busca socios industriales de la industria de energía solar con el fin de licenciar la patente.

Details

Tittle:
New high temperature air stable solar selective coating for concentrated solar power (CSP) collectors
Summary:
A Spanish Research Institution has developed a new solar selective coating, essential component of concentrated solar power collectors. This material has a radiation selective absorbing layer and remarkable optical properties. It is stable in air up to 700 ºC, obtaining a much higher efficiency than current used coatings for air operation (reported use until 550ºC). Industrial partners from the solar energy industry are being sought to collaborate through a patent licence agreement.
Description:
Solar selective coatings (SSC) are important component of receivers in concentrated solar power (CSP) technology, used to generate electrical energy. Solar industry is demanding reliability coatings able to keep their properties a long operational lifetime. These optical properties should remain at temperatures as high as possible because efficiency increases with working temperature. Temperatures in the 600-700 ºC range are required to improve efficiency of conventional parabolic trough collector (PTC) systems. Nowadays there are not available selective coatings to be used in air at high temperatures (stability below 550 ºC).
The coating developed is based on a visible absorbent structure composed of two films of hybrid silicide-nitride composite or cermet and an antireflection dielectric layer made of an oxide. This antireflective layer is deposited on top of the first one. It avoids solar energy loss and inhibits the oxygen passing through, preventing the oxidation of the UV-Vis absorbent structure. This solar selective coating exhibits excellent stability in air at high temperatures (from room temperature up to 700 ºC) after indefinably long time periods.
Advantages and Innovations:
¿ Stability on air up to 700 ºC.
¿ High solar absorptivity and low thermal emissivity.
¿ Tuneable capability: the selective transition between the visible absorbance and the infrared reflectance can be easily tuned in wavelength by changing the layers thickness or the composite concentration.
Stage of Development:
Under development/lab tested
IPs:
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
Spanish patent application filed, suitable for international extension

Partner sought

Type and Role of Partner Sought:
Industrial partners from the coating sector or concentrated solar power collectors manufacturers interested in a license agreement for further development and exploitation and commercialization of the technology

Client

Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English
Spanish

Keywords

Technology Keywords:
04005005 Energía térmica / solar
02002002 Recubrimientos