The knowledge of charcoal fuels:
1. The production of traditional charcoal in Japan used long time and wasted energy. The heat energy from charcoal is about 8,000 kcal/kg.
2. The waste wood can be made for many kinds of fuel.
3. Tokyo University of Agriculture tries to decrease expenses of farmers by producing cheap fuel and high energy. TUA builds Hydro-Pressure Machine to produce fuel from waste wood. The fuel energy are 4,000kcal/kg and 5,400 kcal/kg, respectively (Figure 64).The more hours that they used, the more energy that we had gotten.
4. These charcoal fuels are used for producing strawberry in green house in winter.