After getting doctor degree from Shanghai Jiao Tong Universtiy on March, 2005, Li Jinping have been on the way to research and development of the renewable energy system completely depending on solar energy and biomass, which is self-sufficient and able to meet all-round energy needs of users. Now, he is a professor in Lanzhou University of Technology. He has more than 60 papers published and serves as the dean of Key Laboratory of Complementary Energy System of Biomass and Solar Energy and the dean of Collaborative Innovation Center of Key Technology for Northwest Low-Carbon Urbanization, Gansu Province, China.


In order to meet the energy demands of electricity, heating and cooking gas continuously and steadily with solar energy and biomass, which is abundant in Northwest China, a 117 m2 single building was considered and a renewable energy system was integrated with the photovoltaic array, solar thermal collector and thermostatic biogas digester in Minqin County, Gansu Provinice, China. The performances of CHPB was experimentaly studied and the economic and environmental benefits were evaluated. During the whole heating period, the system meets 69% of building heating. When the daily average ambient temperature is higher than 3℃, the system can meet building heating completely. While the accmumlated daily solar radiation is less than 14 MJ/m2, the system can not meet the energy demads for building heating.The total biogas produced by system during test is 110.71 m3, with an average methane content of 54.74%, which always meets the cooking fuel demands of the residents. The daily electricity generated is always higher than the consumed by the system itself, the system can meet the electricity demands partly in the heating periods, and meet completely in the non-heatingperiods. Every year, the system saves 3556kg standard coal, and meets 79.3% total energy demands of the building. Thus, the system leads to 9317 kg CO2 reduction, 30.2 kg SO2 reduction and 26.3kg NOx reduction, 9.2 m3sheep manure recycle and 11 m3 organic fertilizer production. The static payback period of the system is 6.75 years.