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Energy Recapture Technologies. 11720336 Kozo Nagata. What is energy recapture?. Currently , many energy are generated. But over 60 % of that energy is thrown away. . So , the method storage these extra energy and pick up the energy when it is needed have gotten attention. - PowerPoint PPT Presentation
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Energy Recapture Technologies
11720336Kozo Nagata
The solar cell and wind turbine can’t supply a stable power.The demand of electricity is high for daytime and low for nighttime. The demand of electricity is high for summer and low for spring and fall.
What is energy recapture?Currently , many energy are generated. But over 60 % of that energy is thrown away.
So , the method storage these extra energy and pick up the energy when it is needed have gotten attention.
energy recapture = Storage system
Compressed Air Energy StorageGas Turbine (CAES-GT)
①Activate the compressor by using electricity for nighttime ②Store the compressed air in underground space③Pick up for daytime and generate by gas turbine power
Advantage
Disadvantage
Long-life operation
Need underground space that have air tightness and pressure tightness
Sodium-Sulfur-Battery (NaS-Battery)
Secondary battery that repeat charge and discharge by a chemical reaction between sodium and sulfur
Advantage
Disadvantage
Cost-cutting by mass-produced
Need to keep the heat in 300 ℃
Flywheel-Battery
Repeat charge and discharge by fluctuation of speed of rotation of disk that has big inertia moment
Advantage
Disadvantage
High energy density
Expensive material
Pumped Storage Generation
①Pump up a large amount of water by using electricity for nighttime ②Generate electricity by flowing the water for daytime
Nuclear power generation and thermal power generation are difficult to adjust the amount of electricity generated.So they need these large storage generation.
Advantage
Disadvantage
Generate large electricity
Location
Comparison
Scale Storage efficiency
Response speed
Electricity generated
Compressed air Middle 60-75% Slow 8MWh
NaS Battery Small-Middle 75% Rapid 48MWh
Flywheel Battery Small 70-90% Rapid 58kWh
Pumped Storage Large 65-70% Slow 180MWh
What energy recapture technologies would work best in Japan?
How much energy could Japan generate in this way in one year?
Topics
They have different purpose.So it is best to use them as each usages.
180MWh × 365 days × 50 plants = 3285GWh
The number of Pumped Storage generations in Japan
References• http://avalonbreeze.web.fc2.com/32_01_powerstorage.html• http://www.jeea.or.jp/course/contents/09401/• http://criepi.denken.or.jp/jp/kenkikaku/report/download/IpjgrVODy4pl24VDxzwB29G2OJC1
wjsA/report.pdf• http://www.ngk.co.jp/product/nas/about/index.html• http://criepi.denken.or.jp/jp/kenkikaku/report/download/IpjgrVODy4pl24VDxzwB29G2OJC1
wjsA/report.pdf• http://www.enecho.meti.go.jp/info/statistics/denryoku/result-2.htm• http://www.fepc.or.jp/• http://www.geocities.jp/tobosaku/kouza/plice2.html• http://www.jeea.or.jp/course/contents/09401/• http://avalonbreeze.web.fc2.com/32_01_powerstorage.html• http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2004_07/jspf2004_07-572.pdf
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