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A new RTTV (roof thermal transfer value) calculation method for cool roofs

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  • Zingre, Kishor T.
  • Wan, Man Pun
  • Yang, Xingguo

Abstract

Methods to estimate RTTV (roof thermal transfer value, or equivalent) currently adopted by numerous South East Asian countries have different inherent limitations in accurately evaluating the thermal performance of cool roofs. These existing methods either use a fixed value to represent the solar reflectance effect or assume a linear correlation between annual-averaged conduction heat gain and solar absorptance, which are shown to be inaccurate. In this paper a new RTTV model is proposed with new formulation for modelling the equivalent thermal resistance increment due to the solar reflectance effect on opaque roofs using the previously developed CRHT (Cool Roof Heat Transfer) model. The new formulation is incorporated into the U-value estimation of the heat conduction gain component. The new RTTV model is validated against computational simulations and experiments on an air-conditioned test building with flat concrete roof in Singapore. The Current RTTV model adopted in Singapore gives large error in RTTV estimation for the test building at high-reflectance (over-estimates by 20 times at reflectance = 0.90) whereas the new RTTV model gives much more accurate estimations (maximum error within 12%). The proposed method for new RTTV model formulation is also applicable to other similar models, and is not limited by climate conditions.

Suggested Citation

  • Zingre, Kishor T. & Wan, Man Pun & Yang, Xingguo, 2015. "A new RTTV (roof thermal transfer value) calculation method for cool roofs," Energy, Elsevier, vol. 81(C), pages 222-232.
    • Handle: RePEc:eee:energy:v:81:y:2015:i:c:p:222-232
    DOI: 10.1016/j.energy.2014.12.030
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    Cited by:

    1. Bu, Fan & Yan, Da & Tan, Gang & Sun, Hongsan & An, Jingjing, 2023. "Acceleration algorithms for long-wavelength radiation integral in the annual simulation of radiative cooling in buildings," Renewable Energy, Elsevier, vol. 202(C), pages 255-269.
    2. Kishor T. Zingre & Kiran Kumar D. E. V. S. & Man Pun Wan, 2020. "Analysing the Effect of Substrate Properties on Building Envelope Thermal Performance in Various Climates," Energies, MDPI, vol. 13(19), pages 1-8, October.
    3. 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.
    4. Lei, Jiawei & Kumarasamy, Karthikeyan & Zingre, Kishor T. & Yang, Jinglei & Wan, Man Pun & Yang, En-Hua, 2017. "Cool colored coating and phase change materials as complementary cooling strategies for building cooling load reduction in tropics," Applied Energy, Elsevier, vol. 190(C), pages 57-63.

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