China's first solar heating building built in Yongdeng County
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July 28 02:28:40, 2025
In a significant step towards sustainable building practices, the first solar-heating demonstration project was launched in Yongde County by a collaborative effort between the Gansu Provincial Research Institute of Building Materials Research and Design, the Institute of Electrical Engineering at the Chinese Academy of Sciences, and the Rural Energy Conservation and New Energy Laboratory at Tsinghua University. This initiative marked the establishment of a new pilot construction base for advanced building materials.
The demonstration building originally featured a single-layer brick-concrete structure, which suffered from poor thermal insulation and high energy consumption. Through the implementation of various energy-saving technologies, the building now meets the national standard for building energy efficiency of 65%. The heating system integrates a heat-pipe vacuum tube with a 22kW photovoltaic power generation system installed on the roof. This system supports base production, lighting, and both heat storage and heating functions.
A heat storage system utilizes 9 cubic meters of specially designed concrete as a thermal medium, combined with a 3-ton circulating water tank to ensure efficient heat distribution. The system employs high-efficiency radiators to maximize performance. After nearly four months of trial operation, the system successfully met the building’s heating demands, providing up to 16 hours of continuous heating.
The successful operation of this demonstration system highlights the potential of solar heating technology as a viable solution for green, low-carbon buildings. It has the capacity to play a crucial role in reducing air pollution and promoting the growth of energy-efficient and environmentally friendly industries. Currently, engineers are working on optimizing the system to support broader application in the future. Reporter: Zhang Xiaoyan