Abstract
Previous development of solar energy technologies was progressed from two sectors of thermal and photovoltaic utilizations. Presently, each of technology such as solar hot water unit and PV system is in commercial stage. From the viewpoint of effective use of solar energy, solar hybrid collector generating heat and electricity from the sun was developed. This is called solar co-generation from the meaning of produce or supply of heat and electricity. Although this is one of the most useful methods of solar energy, we can use effectively solar energy than before if fuel is produced by solar energy. One of the methods to realize this idea is solar tri-generation. In this paper, we propose the methods of solar tri-generation producing heat, electricity and fuel from the sun.
