TAILIEUCHUNG - Biofuels, Solar and Wind as Renewable Energy Systems_Benefits and Risks Episode 1 Part 7

Tham khảo tài liệu 'biofuels, solar and wind as renewable energy systems_benefits and risks episode 1 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 134 . Ferguson The power density that is likely to be achieved when coal is used to produce electricity has been estimated at 315kW e Note that the power density is there given in terms of the electrical output. Since the efficiency of producing electricity from coal is about 30 it can be deduced that in terms of the coal that produces the electricity its power density is about 315 1050 kW ha. The normal route is of course first to calculate the power density of coal itself but that is After establishing the output of electricity from wind turbines as will be done later it will be appropriate to discuss whether emphasis should be placed on the power density in terms of just the electrical power produced from the wind turbines or whether as is often done that output should be uprated to take account of the fossil fuel required to produce it. For the present note only that as the output of wind turbines is electricity the first step will be to measure the power density in terms of the electrical output . power density measured as kilowatts of electricity kW e rather than kW of fossil fuel equivalent. Before proceeding further into the study of wind power it will be relevant to look briefly also at the power density of liquid fuels produced from biomass. There are various categories of power density which can be assessed all of them useful in their own way. The one that is least controversial is to measure the output per hectare of for example ethanol subtracting from it only the amount of energy input that needs to be in liquid form . as gasoline diesel or ethanol. That gives the useful ethanol per hectare. In such an assessment the power density of ethanol from corn maize is about kW ha OPTJ 3 1 .4 Incidentally ethanol from sugarcane when assessed on this same basis typically achieves a power density of ha but soil erosion problems are worse with sugarcane than with corn and the land that is suitable for growing sugarcane

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