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Performance evaluation of a metamaterial-based new cool roof using improved Roof Thermal Transfer Value model

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  • Fang, Hong
  • Zhao, Dongliang
  • Yuan, Jinchao
  • Aili, Ablimit
  • Yin, Xiaobo
  • Yang, Ronggui
  • Tan, Gang

Abstract

A new cool roof with potential to generate significant energy savings in buildings has been developed from a metamaterial film named as RadiCold. Considering that the RadiCold film has unique optical and thermal characteristics and the current Roof Thermal Transfer Value model neglecting the effect of roof thermal mass that may lead to overestimating the cooling load from roofs, this work developed an improved Roof Thermal Transfer Value model and validated the model for both RadiCold cool roof and traditional roofing structures. Data from the reduced-size model building experiments showed that the improved Roof Thermal Transfer Value model can accurately describe the heat gains or losses via the roofs. Under real-world weather conditions in the United States (Tucson AZ, Los Angeles, CA, and Orlando FL), the improved Roof Thermal Transfer Value model has been applied to three types of roof exterior finishing: shingle, Thermoplastic Polyolefin (a cool roof material) and RadiCold. In a typical meteorology year, the modeling results show that the shingle and Thermoplastic Polyolefin roof transfer 78.9–294.1 kWh/(m2·yr) and 8.5–128.2 kWh/(m2·yr) of heat into the building space, respectively, but the RadiCold cool roof dissipates 137.6–268.7 kWh/(m2·yr) of heat from the building space to outdoor environment (e.g., sky). The cooling load reduction from utilizing RadiCold cool roof results in cooling electricity savings of 113.0–143.9 kWh/(m2·yr) compared to the shingle roof and 88.0–92.4 kWh/(m2·yr) compared to the Thermoplastic Polyolefin roof for the three analyzed locations with an assumed air conditioning system’s coefficient of performance of 3.0.

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  • Fang, Hong & Zhao, Dongliang & Yuan, Jinchao & Aili, Ablimit & Yin, Xiaobo & Yang, Ronggui & Tan, Gang, 2019. "Performance evaluation of a metamaterial-based new cool roof using improved Roof Thermal Transfer Value model," Applied Energy, Elsevier, vol. 248(C), pages 589-599.
    • Handle: RePEc:eee:appene:v:248:y:2019:i:c:p:589-599
    DOI: 10.1016/j.apenergy.2019.04.116
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    Cited by:

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    3. Jiang, Kaiyu & Zhang, Kai & Shi, Zijie & Li, Haoran & Wu, Bingyang & Mahian, Omid & Zhu, Yutong, 2023. "Experimental and numerical study on the potential of a new radiative cooling paint boosted by SiO2 microparticles for energy saving," Energy, Elsevier, vol. 283(C).
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    5. Su, Xiaosong & Zhang, Ling & Liu, Zhongbing & Luo, Yongqiang & Chen, Dapeng & Li, Weijiao, 2021. "Performance evaluation of a novel building envelope integrated with thermoelectric cooler and radiative sky cooler," Renewable Energy, Elsevier, vol. 171(C), pages 1061-1078.
    6. Chi, Fang'ai & Wu, Yun, 2025. "Residential buildings integrated with SPVP and RCL towards energy saving," Renewable and Sustainable Energy Reviews, Elsevier, vol. 212(C).
    7. Wang, Xuanjie & Narayan, Shankar, 2022. "Thermal radiative switching interface for energy-efficient temperature control," Renewable Energy, Elsevier, vol. 197(C), pages 574-582.
    8. Zhang, Yelin & Tso, Chi Yan & Tse, Chung Fai Norman & Fong, Alan Ming-Lun & Lin, Kaixin & Sun, Yongjun, 2024. "A novel radiative sky cooler system with enhanced daytime cooling performance to reduce building roof heat gains in subtropical climate," Renewable Energy, Elsevier, vol. 220(C).
    9. Jiang, Wei & Zhang, Kuan & Ma, Lingyong & Liu, Bo & Li, Qing & Li, Dong & Qi, Hanbing & Liu, Yang, 2022. "Energy-saving retrofits of prefabricated house roof in severe cold area," Energy, Elsevier, vol. 254(PC).
    10. Kong, Xiangfei & Fu, Ying & Yuan, Jianjuan, 2024. "Room-temperature flexible phase change material with high emissivity and high enthalpy for building energy saving," Renewable Energy, Elsevier, vol. 235(C).
    11. Wang, Ze-Ye & Wu, Xian & Qu, Ming-Liang & Fan, Li-Wu & Yu, Zi-Tao & Chen, Shu-Qin & Ge, Jian & Wang, Liang & Dai, Sheng-Juan, 2025. "A field test and evaluation of radiative cooling performance as applied on the sidewall surfaces of residential buildings in China," Applied Energy, Elsevier, vol. 379(C).
    12. Linlin Guo & Zhuqing Liang & Wenhao Li & Can Yang & Endong Wang, 2024. "The Review of Radiative Cooling Technology Applied to Building Roof—A Bibliometric Analysis," Sustainability, MDPI, vol. 16(16), pages 1-20, August.
    13. Tang, Haida & Wu, Juhu & Li, Chunying, 2024. "Experimental study of RRC-PV modules under hot summer and cold winter climate," Renewable Energy, Elsevier, vol. 221(C).
    14. Zhang, Wenshuo & Jiao, Dongsheng & Zhao, Bin & Pei, Gang, 2024. "Experimental and numerical investigation of the effects of passive radiative cooling-based cool roof on building energy consumption," Applied Energy, Elsevier, vol. 376(PA).
    15. Domenico Mazzeo & Giuseppe Oliveti, 2020. "Advanced Innovative Solutions for Final Design in Terms of Energy Sustainability of Nearly/Net Zero Energy Buildings (nZEB)," Sustainability, MDPI, vol. 12(24), pages 1-5, December.
    16. Aili, Ablimit & Long, Wenjun & Cao, Zhiwei & Wen, Yonggang, 2024. "Radiative free cooling for energy and water saving in data centers," Applied Energy, Elsevier, vol. 359(C).
    17. Shan, He & Poredoš, Primož & Zou, Hao & Lv, Haotian & Wang, Ruzhu, 2023. "Perspectives for urban microenvironment sustainability enabled by decentralized water-energy-food harvesting," Energy, Elsevier, vol. 282(C).
    18. Chi, Fang'ai & Liu, Yang & Yan, Jianxiong, 2021. "Integration of Radiative-based air temperature regulating system into residential building for energy saving," Applied Energy, Elsevier, vol. 301(C).
    19. Pirvaram, Atousa & Talebzadeh, Nima & Leung, Siu Ning & O'Brien, Paul G., 2022. "Radiative cooling for buildings: A review of techno-enviro-economics and life-cycle assessment methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).
    20. Liu, Junwei & Zhang, Ji & Zhang, Debao & Jiao, Shifei & Xing, Jincheng & Tang, Huajie & Zhang, Ying & Li, Shuai & Zhou, Zhihua & Zuo, Jian, 2020. "Sub-ambient radiative cooling with wind cover," Renewable and Sustainable Energy Reviews, Elsevier, vol. 130(C).
    21. Wang, Cun-Hai & Chen, Hao & Jiang, Ze-Yi & Zhang, Xin-Xin & Wang, Fu-Qiang, 2023. "Modelling and performance evaluation of a novel passive thermoelectric system based on radiative cooling and solar heating for 24-hour power-generation," Applied Energy, Elsevier, vol. 331(C).

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