Cooling with colour: Passive-Coloured Radiative Coolers for energy-efficient temperature regulation in adverse climatic conditions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508550" target="_blank" >RIV/00216208:11320/25:10508550 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ljwc~e6r.b" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ljwc~e6r.b</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.solener.2025.113343" target="_blank" >10.1016/j.solener.2025.113343</a>
Alternative languages
Result language
angličtina
Original language name
Cooling with colour: Passive-Coloured Radiative Coolers for energy-efficient temperature regulation in adverse climatic conditions
Original language description
Passive Daytime Radiative Cooling (PDRC) is a high-performance strategy to mitigate urban overheating by combining high solar reflectance and strong thermal emission, particularly within the Atmospheric Window wavelength range. However, several intrinsic challenges, such as glare, aesthetics, and winter overcooling, limit its widespread application. This study reports on the development and cooling performance of Passive Coloured Radiative Coolers (PCRCs) with a threefold heat-rejection mechanism: moderately high solar reflectance, high infrared emissivity, and sunlight-excited fluorescence. The objective was to create PCRCs with reduced reflectivity to diminish glare and aesthetic concerns, while the incorporation of fluorescence offsets the cooling decrease caused by lower reflectance. The development of PCRCs sought consistent performance throughout the year, reducing the winter heating penalty. Seven PCRCs-Green, Red, Orange, Reddish-orange, and Purple-were developed and tested in two climate zones with unfavourable conditions for radiative cooling: Sydney and Alice Springs, Australia, characterised by high humidity and dust concentrations, respectively. The developed PCRCs consistently maintained lower surface temperatures than their coloured non-fluorescent counterparts and the highly reflective white references. All PCRCs-except purple-outperformed the white reference, maintaining surface temperatures up to 5.4 degrees C lower in Sydney and 4.0 degrees C lower in Alice Springs. These findings highlight the potential of PCRCs to reduce urban surface temperatures and cooling energy demand and underline their role in advancing sustainable urban design. By addressing PDRCs' limitations, PCRCs could facilitate the adoption of radiative cooling technologies in urban environments, supporting energy policy objectives and promoting resilient urban planning strategies aimed at combating climate change and urban overheating.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20100 - Civil engineering
Result continuities
Project
<a href="/en/project/GA23-06644S" target="_blank" >GA23-06644S: Fluorescent radiative-cooling materials: development, testing and applications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Solar Energy
ISSN
0038-092X
e-ISSN
1471-1257
Volume of the periodical
290
Issue of the periodical within the volume
neuveden
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
113343
UT code for WoS article
001435740400001
EID of the result in the Scopus database
2-s2.0-85218460986