08 waves biomass - University of Cagliari · Sugarcane Cassava Sweet sorghum Sweet potato Corn (maize) Wood Litres of ethanol per tonne of crop 125 370 Litres of ethanol per hectare

Waves

Waves

Waves

Waves

Energia dalle onde - sommario

Media

Risorsa al picco Pl= 12ρgh2v = 40kW /m

Pl= 18ρgh2v =10kW /m

Conversione elettrica Pl×η = 3kW /m

Waves

Waves

Waves

Waves

Waves

Waves

Biomasses and biofuels

Photosynthesis

Photosynthesis

Biomass yields

Biomass burning: efficiency and available power

e.g. 2kg municipal waste/person/day

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

Produzione yield = 10 ⋅103Kg

ha × y

Risorsa yield × energydensity =50 ⋅103KWh

104m2 × 24 ⋅365h≈ 0.6 W

m25KWhKg

Sugarcane

Ethanol

Ethanol

Biodiesel