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Biomasses and biofuels
Photosynthesis
Photosynthesis
Biomass yields
Biomass burning: efficiency and available power
e.g. 2kg municipal waste/person/day
Sugarcane
Ethanol
Ethanol
Biodiesel
Biomass burning: efficiency and available power
Output power = yield × energy density × mass density × burning efficiency Overall biomass efficiency = Power/Insolation Area = Needed power / Output power
Ex: - wood in Sardinia: yield 10 m3(7 ton)/ha/year, energy density 5 kWh/kg (dry) - sorgo: yield 50ton/ha/year, energy density 5 kWh/kg (dry)
Biomasse - sommario
Energy density 5KWh / kg
Power density = Yield × Energy density = 0.3W /m2
Yield 10− 50 tonha× y
(dry)
Benzina = 10kWh/l (12kWh/kg)
Batterie?
Acqua? (diga di 100m)
= 0.25 – 0.4kWh/kg
= 0.00028kWh/kg
Densità energetica
Idrogeno? = 39kWh/kg
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