Abstract
Strengthening the thermal performance of building envelopes is an important direction towards achieving energy efficiency. This paper investigated the thermal performance and energy-saving effect of phase change material (PCM) cool roofs in office buildings during the summer season in Chongqing, leveraging a combination of measurement and simulation techniques. Compared to ordinary and PCM roofs, the PCM cool roof exhibited improved thermal performance, indoor thermal environment, and enhanced building energy savings. Results showed that the inner wall temperature of the PCM cool roof was 6.3 °C lower than that of an ordinary roof, and had a cooling range 65.1% higher than that of a PCM roof. Through computational fluid dynamics (CFD) simulations, this study analyzed the influence of five parameters on the thermal performance and latent heat utilization of the PCM cool roof. Finally, the energy-saving potential and economic benefits of using PCM cool roof in an office building in Chongqing were simulated. This study is helpful to the popularization and application of PCM cool roof.
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