Thermal performance of a PCM slab roof combined with new radiative cooling materials
A PCM slab roof combined with new spectrally selective radiative cooling materials was proposed to improve the cold charging efficiency and cooling effect of PCM slab roof.A computational heat transfer model of the coupled cooling roof was established.Taking Fuzhou area as the research object,the thermal perform-ance of the coupled cooling roofs made of seven commercially available PCMs was investigated and compared with the traditional PCM slab roofs without new radiative cooling materials and ordinary roofs.It is found that the new radiative cooling materials can effectively reduce the temperature fluctuation and peak temperature of the outer surface of the roof,and improve the latent heat utilization rate of the PCM.From June 1 to September 30,the coupled cooling roof with RT25HC PCM can reduce the air conditioning cooling capacity by 159%compared with the traditional phase change roof.The greater the difference between outside air temperature and effective sky temperature,the more significant the energy saving advantage of the coupled cooling roof com-pared with the traditional phase change roof.
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