Abundant solar energy resources were existed in Gannan Tibetan area where passive solar houses are widely used in this area. However, due to their functions are single and unstable, the heating load in winter is very large. In winter, Tibetan residents still need to rely on coal and dry cow dung for heating. In order to solve this problem, a thermoelectric methane supply system was established on the basis of the original passive solar house by utilizing the abundant solar energy and biomass resources in Tibet. This system can provide users with winter heating, domestic electricity, domestic hot water and gas to meet different levels of energy demand. Through the whole heating season of test of the system, the results show that the system is stable, and the system heat supply accounts for 94.4% of the total building heat demand. For most of the time, the indoor temperature is higher than 14 ℃, the cumulative output of biogas is 95 m3, and the average daily output of biogas digester is 0.76 m3. During the test period of PV power generation subsystem, the daily generation capacity was 3.1 kWh. The system has good economy and environmental protection. The use and promotion of this system has changed the backward energy utilization mode, improved the energy utilization efficiency, reduced the use of fossil fuels, improved the quality of life for residents, and improved the natural environment.
Keywords Tibetan areas, energy supply systems, renewable energy