Experimental and Numerical Study on the Insulation Performance of a Photo-Thermal Roof in Hot Summer and Cold Winter Areas

被引:2
作者
Zhang, Ying [1 ]
Sun, Hongfa [1 ]
Long, Jibo [1 ]
Zeng, Li [2 ]
Shen, Xiaohang [3 ]
机构
[1] Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan 411105, Peoples R China
[2] Wenzhou Ind Design Inst Co Ltd, Wenzhou 325000, Peoples R China
[3] Hunan Univ, Coll Civil Engn, Changsha 410082, Peoples R China
基金
中国国家自然科学基金;
关键词
building energy consumption; photo-thermal roof; water saturation; insulation performance; temperature distribution; THERMAL PERFORMANCE; ENERGY; SIMULATION; COMFORT; OFFICE; IMPACT;
D O I
10.3390/buildings12040410
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The use of a solar architecture system is a feasible way to reduce the energy consumption of a building. The system also has important significance to the "Dual-carbon" plan. In this study, the heat transfer characteristics of a photo-thermal roof were analyzed in hot summer and cold winter zones; a model to calculate insulation performance was established. In the summer climate, the thermal performances of the photo-thermal roof and an ordinary roof were explored through experiments and simulations. The results showed that the heat transfer and temperature of the photo-thermal roof were lower than those of the ordinary roof. Heat transfer through a photo-thermal roof can be changed by adjusting the water flow of collectors. The water saturation of insulation materials is an important factor that affects the insulation performance of a roof. Compared with the ordinary roof, the change in water saturation was shown to have less impact on the insulation performance of the photo-thermal roof. The water saturation increased from 0 to 30%, while the heat transfer per unit area of the photo-thermal roof only increased by 0.9 W/m(2); 97.3% lower than that of the ordinary roof. The effect of reducing the insulation material thickness was less for the photo-thermal roof than for the ordinary roof. When the insulation material thickness was reduced from 100 mm to 0 mm, the average temperature in the indoor non-working area reached 38.5 degrees C and 27.1 degrees C in the ordinary roof and the photo-thermal roof, respectively. The insulation thickness of the photo-thermal roof had little effect on the indoor air temperature. The research results provide a reference for the roof energy-saving design of new buildings and the roof energy-saving transformation of existing buildings.
引用
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页数:22
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