Coating that selectively absorbs radiation, and method thereof for achieving ambient temperature

Abstract

The instant invention relates to thermal applications. More specifically, it relates to coatings applied on metals, used for harnessing solar radiation or artificial illumination. The object of this coating is to improve the efficacy of solar energy collection, maximizing visible light harnessing and minimizing heat emission in the metal. The procedure including the composition and obtainment of the solar absorbing coating operating in the low and medium temperature range from 25° C. to 300° C., and that can be used in devices generating heat through solar radiation or artificial illumination is described.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a national stage entry of PCT / MX2014 / 000173 filed Nov. 4, 2014, under the International Convention claiming priority over Mexican Patent Application No. MX / a / 2014 / 001213 filed Jan. 29, 2014.FIELD OF THE INVENTION[0002]The instant invention relates to thermal applications. More specifically, it relates to a selective absorbing coating used on metal, employed for harnessing solar energy and converting it into thermal energy. The object of said coating is to improve the efficiency in the collection of thermal energy, optimizing visible light harnessing and minimizing heat emission in the metal.OBJECT OF THE INVENTION[0003]The object of the instant invention is to present a process for obtaining a solar radiation selective absorbing coating at room temperature operating in the low and medium temperature range from 25° C. to 300° C. that can be applied on devices generating heat through solar radiation or artificial illumina...

AI Technical Summary

Benefits of technology

The invention provides a simple process for reducing costs in industries that require process heat and use fossil fuels. This process has not been previously used and is a novel solution for its simplicity and positive results.

Problems solved by technology

The main advantage is an absorbance greater than 95% and an emittance lower than 0.2 in the temperature range from 400° C. to 550° C. However, their compositions and methods of obtainment are very complex and thus would not be economically sound in industries such as: food, textile, among others, because of their high production costs and thus the high price of the final product.

Specifically, the inventions described in patents ES2317796B2 or ES2316321B2, report very acceptable absorbance values but their emittance values are not so favorable, leading to a selectivity ratio α / ε≦10.

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