科研之友
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摘要
The implementation of radiative cooling materials can cool the substrate and the indoor air. It will generate energy saving for cooling in summer but increase the energy demand for heating in winter. In this study, a new method using TRNSYS integrated with MATLAB thermal model to calculate the energy saving for buildings with spectral-dependent radiative cooling roofs has been proposed. The energy-related strengths and weaknesses of applying such materials on the rooftop under various climatic and insulating conditions have been revealed, and three reference roofs have been analyzed as well. It is observed that radiative cooling roofs can reduce more annual energy use under cooling-dominated climates. Adding insulation with R-value equivalent to that of existing buildings can largely reduce the total energy consumption in all scenarios. Further increasing the thickness of the insulation layer to be equivalent to the requirement from the latest building code can only produce a tiny addition to the energy reduction. With insulation added, under cooling dominated climate or climate with mixed heating and cooling domination, the radiative cooling material still has advantages in reducing the overall energy consumption. Collectively, this study has provided reference and guidance for energy-oriented decision-making process for implementing radiative cooling roofs. It has highlighted that comprehensive analysis of local climate and building insulation condition is imperative.
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单位广东工业大学
