Cooling with colour: Passive-Coloured Radiative Coolers for energy-efficient temperature regulation in adverse climatic conditions

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Cooling with colour: Passive-Coloured Radiative Coolers for energy-efficient temperature regulation in adverse climatic conditions

Popis výsledku v původním jazyce

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&apos; 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.

Název v anglickém jazyce

Cooling with colour: Passive-Coloured Radiative Coolers for energy-efficient temperature regulation in adverse climatic conditions

Popis výsledku anglicky

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&apos; 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/GA23-06644S" target="_blank" >GA23-06644S: Fluorescenční materiály pro chlazení vyzařováním: vývoj, testování a aplikace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Solar Energy

ISSN

0038-092X

e-ISSN

1471-1257

Svazek periodika

290

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

113343

Kód UT WoS článku

001435740400001

EID výsledku v databázi Scopus

2-s2.0-85218460986