Advances in the Development of Cool Materials for the Built Environment

Research on Thermochromic and PCM Doped Infrared Reflective Coatings

Author(s): Theoni Karlessi and Mattheos Santamouris

Pp: 83-103 (21)

DOI: 10.2174/9781608054718113010007

* (Excluding Mailing and Handling)

Abstract

The present research investigates the development of thermochromic and PCM doped infrared reflective coatings and the potential of their application on urban structures in energy savings and improvement of the microclimate.

Thermochromic coatings were developed by using thermochromic pigments into an appropriate binder system. The color-changing temperature was 30°C. The same binder system was used for the production of highly reflective (cool) and common coatings, in order to investigate and compare the thermal and optical characteristics of colormatched thermochromic, cool and common coatings. The results demonstrated that during the experimental period, surface temperatures of thermochromic samples were lower than the temperatures of color-matched cool and common. Issues concerning the photodegradationof thermochromic coatings are also discussed.

The performance of organic PCMs used as latent heat storage materials, when they are incorporated in building coatings is also studied. Comparative testing proved that all PCM doped infrared reflective coatings present lower surface temperatures than cool and common coatings of the same color. Studying the daily temperature differences it was noticed that peak temperature differences occur between PCM and common or cool coatings from 7am-10am.These peak temperature differences are not noticed for common and cool coatings. Moreover investigating the temperature gradient it was shown that for this time period the values for the PCM coatings is much lower compared to cool and common. Coatings containing PCMs store heat in a latent form maintaining constant surface temperatures and discharge with a time delay.


Keywords: Phase change materials, thermochromic pigments, optical and thermal properties.

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      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Trial Access" as access_base_text, CASE j.type WHEN 111 THEN true ELSE false END as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_trail` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51286341 and j.to_ip >=51286341 )) and ((j.from_date <= 1739848522 and j.to_date >= 1739848522 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 4886) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Subscribed" as access_base_text, false as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_corporate` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51286341 and j.to_ip >=51286341 )) and ((j.from_date <= 1739848522 and j.to_date >= 1739848522 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 4886) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Token Based Access" as access_base_text, false as terms_popup, "R" as content_download_type, j.uc_id as restricted_user_access_key, "v" as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_token` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51286341 and j.to_ip >=51286341 )) and ((j.from_date <= 1739848522 and j.to_date >= 1739848522 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 4886)
      510μsalphaeurekaselec_live_10_06_2022UserAccess.php#1266
      Backtrace
      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1549
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • select b.banner_link, b.banner_name, b.banner_script, b.banner_remarks, b.banner_file_name, b.banner_placement, bd.content_type, bd.content_id from `tbl_banner` as `b` inner join `tbl_banner_detail` as `bd` on `bd`.`banner_id` = `b`.`banner_id` inner join `users` as `u` on `u`.`id` = `b`.`updated_by` where `b`.`banner_ebook` = 1 and `bd`.`content_type` = 'B' and `bd`.`content_id` = 1207 and `b`.`banner_from_date` <= 1739848522 and `b`.`banner_to_date` >= 1739848522 and `b`.`banner_status` = 'A' order by `b`.`banner_id` desc
      1.04msalphaeurekaselec_live_10_06_2022Banner.php#95
      Bindings
      • 0: 1
      • 1: B
      • 2: 1207
      • 3: 1739848522
      • 4: 1739848522
      • 5: A
      Backtrace
      • 13. app/Models/Banner.php:95
      • 14. app/Http/helpers.php:404
      • 17. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 18. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    • select count(*) as aggregate from `uc_cart_products` where cart_id='ea5e56c91aa6fa8b0fe6f82e58ae3c5e'
      190μsalphaeurekaselec_live_10_06_2022Cart.php#271
      Backtrace
      • 15. app/Models/Cart.php:271
      • 16. view::layouts._header:260
      • 18. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 20. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    App\Models\Keywords
    3Keywords.php#?
    App\Models\Chapter
    1Chapter.php#?
    App\Models\Ebook
    1Ebook.php#?
        _token
        fJYlfV9l9RemF7D05QpBmUYjyxCN84N8kR7MhWK8
        uc_cart_id
        ea5e56c91aa6fa8b0fe6f82e58ae3c5e
        _previous
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        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/4886
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
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        request_cookies
        0 of 0
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        response_headers
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        ClearShow all
        Date ↕MethodURLData
        #12025-02-18 03:15:22GET/chapter/4886112195