lecture 1 - iowa state university€¦ · 1620 howe hall 3-4 wed and by appt [email protected]...
TRANSCRIPT
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CLASS 1
TSC 220ENERGY
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UNDERSTANDINGENERGY
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1 N-m
4.2 J
kcal (1000 calories)
4.2 kJ
1 Joule
1 cal
1 kcal(or Calorie)
1 kcal
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1 hour vigorous exercise ~
260 - 430 kcals
1.1 - 1.8 MJ
300 - 500 Wh
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1 quarter pounder =
60+ minutes of vigorous exercise
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We consume 2500 kcal/day
= 10,000 Btu/day
= 2.9 kWh/day
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~ 120 W
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Full day of work
100 Wh
×10 hday
×1 kWh1000 W
= 1 kWh day
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0.35 kW-h
1 kWh
11,000 kWh
3 TW-yr
1 candy bar
Human worker (1 day)
Household electric use (1 yr)
US energy use (1 yr)
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~100,000 kWh/person/year
~10,000 h/yr (actually 8760)
= 10 kWh of continuous use
for each person
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10 kWh of continuous use
= 240 kWh each day
= 240 personal servants
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Household electricity usage
30 kWh per day per household
= 30 servants per household
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about
10 personal servants
for each person
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Power
W Watt 1 W ~ LED Flashlight
kW Kilowatt 1000 W 1.5 kW ~ Stove burner
MW Megawatt 1000 kW 1 MW ~ 5 ISU Buildings
GW Gigawatt 1000 MW 0.8 GW ~ Power plant
TW Terawatt 1000 GW 3.3 TW ~ US energy use
PW Petawatt 1000 TW
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1 quadrillion Btu’s
1.055 exajoulequad =
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“ALTERNATIVE” ENERGY?
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COLONIAL AMERICA
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Wood is the primary fuel
Wood is in short supply
Franklin stove invented
Coal discovered in PA
1650
1700
1742
1792
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Coal:the alternative fuel1792
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MEANWHILE IN ENGLAND
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Spinning mule patented
Spinning mule out of patent
1769
1783
The industrial revolution is on ...
...powered by water mills
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Running out of suitable sites for water mills
Watts - steam engine
1820
1830
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JAMES WATT - 1800
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Condensing engines1820
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ENERGY IN 1870 AMERICA
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“The subterranean stores of coal are becoming exhausted ....”
Lord Kelvin 1881
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first windmill for electric power production1887
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ENERGY IN 1890 AMERICA
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Svante Arrhenius
fossil fuel combustion may cause global warming
1896
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Oil:the alternative fuel1900
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the gas engine1900
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Today What is the Alternative Energy?
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5.6 TW - OIL
3.8 TW - COAL
3.5 TW - NATURAL GAS
0.9 TW- NUCLEAR
0.9 TW- HYDRO
0.1 TW- OTHER
WORLD ENERGY USE = 14.8 TW-YR
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5.6 TW - OIL
3.8 TW - COAL
3.5 TW - NATURAL GAS
0.9 TW- NUCLEAR
0.9 TW- HYDRO
0.1 TW- OTHER
WORLD ENERGY USE = 14.8 TW-YR
12.9 TW-YR (87%)
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0.1 TW - OIL
0.8 TW - COAL
0.4 TW - NATURAL GAS
0.3 TW- NUCLEAR
0.3 TW- HYDRO
0.1 TW- OTHER
WORLD ELECTRICAL USE = 2 TW-YR
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0.1 TW - OIL
0.8 TW - COAL
0.4 TW - NATURAL GAS
0.3 TW- NUCLEAR
0.3 TW- HYDRO
0.1 TW- OTHER
WORLD ELECTRICAL USE = 2 TW-YR
1.3 TW-YR (65%)
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1.9% - OIL
49.5% - COAL
19.5% - NATURAL GAS
19% - NUCLEAR
7.4% - HYDRO
2.7% - OTHER
U.S. ELECTRICAL USE = 0.5 TW-YR
0.35 TW-YR (71%)
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OTHER
1.14% - BIOMASS
0.62% - WIND
0.53% - WASTE
0.39% - GEOTHERMAL
0.01% - SOLAR THERMAL
0.00% - SOLAR PV
0.00% - TIDE/CURRENT
0.005% - OTHER