Frontiers in Energy
>> 2013,
Volume 7,
Issue 4
doi:
10.1007/s11708-013-0278-2
RESEARCH ARTICLE
Characteristics and application of road absorbing solar energy
1. School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China; 2. School of Natural and Built Environments, University of South Australia, Adelaide 5000, Australia
Available online: 2013-12-05
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Abstract
If the heat of road surface can be stored in summer, the road surface temperature will be decreased to prevent permanent deformation of pavement. Besides, if the heat stored is released, it can supply heat for buildings or raise the road surface temperature for snow melting in winter. A road-solar energy system was built in this study, and the heat transfer mechanism and effect of the system were analyzed according to the monitored solar radiant heat, the solar energy absorbed by road and the heat stored by soil. The results showed that the road surface temperature was mainly affected by solar radiation, but the effect is hysteretic in nature. The temperature of the solar road surface was 3°C–6°C lower than that of the ordinary road surface. The temperature of the solar road along the vertical direction was 2°C–5°C lower than that of the ordinary road. The temperature difference increased as the distance to the heat transfer tubes decreased. The average solar collector efficiency of the system was 14.4%, and the average solar absorptivity of road surface was 36%.
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