Experiencing Passive Daytime Radiative Cooling in Commercial Roofs with Ultrahigh-Temperature Reduction Using Micro/Nanoparticles-Distributed Porous Polymeric Structure

IF 3.6 4区工程技术 Q3 ENERGY & FUELS

Energy technology Pub Date : 2025-01-24 DOI:10.1002/ente.202401869

Ragunath Lakshmanan, Kamatchi Rajaram

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Abstract

Recently, great interest is pursued by researchers in radiative cooling paints (RCPs) due to enhanced passive cooling capability, space cooling demands are reduced, and greenhouse gas emissions are combated owing to hassle-free applicability on existing structures. In this study, different formulation of RCPs is developed such as RCP1, RCP2, RCP3, and RCP4. The real-time cooling capability of all the developed RCPs are experimentally investigated by painting a single layer on asbestos cement sheet and clay tile in indoor and outdoor conditions. Strategic selection of fillers and binders in the development of RCPs maximizes the reflection in solar window and emission in thermal window. During outdoor analysis at a tropical savanna condition, a drastic reduction in temperature of 12.36 °C is observed in RCP3 in a midday and sub-ambient cooling of −3.68 °C observed in nighttime. When compared to commercial white-paint-coated roofs, an excellent reduction of ≈4.3 °C is found with RCP3. Also, RCPs used in this study saves almost 335 Wm⁻² of energy on air conditioners by offsetting negative cooling power of commercial roofs (−300 Wm⁻²) to positive cooling power by 35 Wm⁻². Hence, this passive cooling technique saves people from deadly heat waves.

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利用微/纳米颗粒分布的多孔聚合物结构在商业屋顶进行超高温还原的被动日间辐射冷却

近年来，研究人员对辐射冷却涂料（rcp）产生了极大的兴趣，因为它具有增强的被动冷却能力，减少了空间冷却需求，并且由于对现有结构的无干扰适用性而减少了温室气体排放。本研究开发了不同配方的RCP1、RCP2、RCP3和RCP4。在室内和室外条件下，通过在石棉水泥板和粘土瓦上喷涂单层rcp，研究了所有rcp的实时冷却能力。在rcp的研制过程中，填料和粘结剂的合理选择可以最大限度地提高太阳能窗的反射和热窗的辐射。在热带稀树草原条件下的室外分析中，观察到RCP3在中午温度急剧下降12.36°C，夜间亚环境温度下降- 3.68°C。与商用白漆屋顶相比，RCP3的温度降低了约4.3°C。此外，本研究中使用的rcp通过将商业屋顶的负冷却功率（- 300 Wm−2）抵消为35 Wm−2的正冷却功率，节省了空调近335 Wm−2的能源。因此，这种被动冷却技术使人们免于致命的热浪。

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来源期刊

Energy technology ENERGY & FUELS-

CiteScore

7.00

自引率

5.30%

发文量

审稿时长

1.3 months

期刊介绍： Energy Technology provides a forum for researchers and engineers from all relevant disciplines concerned with the generation, conversion, storage, and distribution of energy. This new journal shall publish articles covering all technical aspects of energy process engineering from different perspectives, e.g., new concepts of energy generation and conversion; design, operation, control, and optimization of processes for energy generation (e.g., carbon capture) and conversion of energy carriers; improvement of existing processes; combination of single components to systems for energy generation; design of systems for energy storage; production processes of fuels, e.g., hydrogen, electricity, petroleum, biobased fuels; concepts and design of devices for energy distribution.