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Colorful low-emissivity paints for space heating and cooling energy savings

Proceedings of the National Academy of Sciences - PNAS, 2023-08, Vol.120 (34), p.e2300856120-e2300856120 [Peer Reviewed Journal]

Copyright National Academy of Sciences Aug 22, 2023 ;Copyright © 2023 the Author(s). Published by PNAS. 2023 ;ISSN: 0027-8424 ;EISSN: 1091-6490 ;DOI: 10.1073/pnas.2300856120 ;PMID: 37579165

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  • Title:
    Colorful low-emissivity paints for space heating and cooling energy savings
  • Author: Peng, Yucan ; Lai, Jian-Cheng ; Xiao, Xin ; Jin, Weiliang ; Zhou, Jiawei ; Yang, Yufei ; Gao, Xin ; Tang, Jing ; Fan, Lingling ; Fan, Shanhui ; Bao, Zhenan ; Cui, Yi
  • Subjects: Air conditioning ; Apartment buildings ; Building envelopes ; Climatic zones ; Cooling ; Emissivity ; Energy ; Energy conservation ; Heat exchange ; Heating ; Infrared reflection ; Near infrared radiation ; Paints ; Physical Sciences ; Reflectance ; Solar heat gain ; Space heating
  • Is Part Of: Proceedings of the National Academy of Sciences - PNAS, 2023-08, Vol.120 (34), p.e2300856120-e2300856120
  • Description: Space heating and cooling consume ~13% of global energy every year. The development of advanced materials that promote energy savings in heating and cooling is gaining increasing attention. To thermally isolate the space of concern and minimize the heat exchange with the outside environment has been recognized as one effective solution. To this end, here, we develop a universal category of colorful low-emissivity paints to form bilayer coatings consisting of an infrared (IR)-reflective bottom layer and an IR-transparent top layer in colors. The colorful visual appearance ensures the aesthetical effect comparable to conventional paints. High mid-infrared reflectance (up to ~80%) is achieved, which is more than 10 times as conventional paints in the same colors, efficiently reducing both heat gain and loss from/to the outside environment. The high near-IR reflectance also benefits reducing solar heat gain in hot days. The advantageous features of these paints strike a balance between energy savings and penalties for heating and cooling throughout the year, providing a comprehensive year-round energy-saving solution adaptable to a wide variety of climatic zones. Taking a typical midrise apartment building as an example, the application of our colorful low-emissivity paints can realize positive heating, ventilation, and air conditioning energy saving, up to 27.24 MJ/m /y (corresponding to the 7.4% saving ratio). Moreover, the versatility of the paint, along with its applicability to diverse surfaces of various shapes and materials, makes the paints extensively useful in a range of scenarios, including building envelopes, transportation, and storage.
  • Publisher: United States: National Academy of Sciences
  • Language: English
  • Identifier: ISSN: 0027-8424
    EISSN: 1091-6490
    DOI: 10.1073/pnas.2300856120
    PMID: 37579165
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    PubMed Central
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