Cooling with Zero Energy and Water Consumption?

Discussion in 'General Science & Technology' started by paddoboy, Feb 9, 2017.

  1. paddoboy Valued Senior Member

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    New engineered material can cool roofs, structures with zero energy consumption
    February 9, 2017

    A team of University of Colorado Boulder engineers has developed a scalable manufactured metamaterial—an engineered material with extraordinary properties not found in nature —to act as a kind of air conditioning system for structures. It has the ability to cool objects even under direct sunlight with zero energy and water consumption.

    When applied to a surface, the metamaterial film cools the object underneath by efficiently reflecting incoming solar energy back into space while simultaneously allowing the surface to shed its own heat in the form of infrared thermal radiation.

    The new material, which is described today in the journal Science, could provide an eco-friendly means of supplementary cooling for thermoelectric power plants, which currently require large amounts of water and electricity to maintain the operating temperatures of their machinery.

    more at
    https://techxplore.com/news/2017-02-material-cool-roofs-energy-consumption.html
     
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  3. paddoboy Valued Senior Member

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    http://science.sciencemag.org/content/early/2017/02/08/science.aai7899

    Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling:


    Abstract

    Passive radiative cooling draws heat from surfaces and radiates it into space as infrared radiation to which the atmosphere is transparent. However, the energy density mismatch between solar irradiance and the low infrared radiation flux from a near-ambient-temperature surface require materials that strongly emit thermal energy and barely absorb sunlight. We embedded resonant polar dielectric microspheres randomly in a polymeric matrix, resulting in a metamaterial that is fully transparent to the solar spectrum while having an infrared emissivity greater than 0.93 across the atmospheric window. When backed with silver coating, the metamaterial shows a noon-time radiative cooling power of 93 W/m2 under direct sunshine. More critically, we demonstrated high-throughput, economical roll-to-roll manufacturing of the metamaterial, vital for promoting radiative cooling as a viable energy technology.
     
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