Undergrad. Certificate in Renewable Energy. Deadline Monday, March 1 Five $1000 scholarships Raesi.colorado.edu/ undergradcert. Too cheap to meter!. Power from nuclear fusion. Nuclear Fusion. 2 1 H 1 + 2 1 H 1 3 2 He 1 + 1 0 n 1 3 1 H 2 + 1 1 H 0
Undergrad. Certificate in Renewable Energy.
Deadline Monday, March 1
Five $1000 scholarships
Too cheap to meter!
Power from nuclear fusion.
21H1 + 21H132He1 +10n1
31H2 + 11H0
Using 21H1=Deuterium (D), 0.015% of all the hydrogen in the oceans.
Each reaction3.65 MeV
(each fission200 MeV)
(carbon atom combustion3 eV)
+: no CO2, lots of deuterium, no fission waste, no runaway
-: How to couple energy to the grid? Not heat.
Keeping the reaction going- 24/7
Activation- the neutrons hit the walls.
Right sized fission reactors
Do we have to build only giant plants? Capital cost, large components, large markets, not modular.
Interest in smaller systems, same principles.
Review of Monday, Wednesday
Nuclear reactions such as fission must balance, in Z and N (and A=N+Z)
Fissions per second=
Joules/sec (Watts) / (Joules/fission)
And each fission releases 200 MeV=200x106 x “eV/Joule” =?????
12 grams of carbon hold 6.02x1023 atoms of carbon. 235 grams of 235U hold 6.02x1023 atoms of 235U. etc
By what factor is the 235U present at the forming of the earth, 4.5 billion years ago, decayed away? T1/2=0.7 billion years
Count half lives=4.5/0.7=6.4 half lives.
At six half lives, (1/2)6=1/64=0.0156
At seven half lives (1/2)7=1/128=0.0078
So we have about 1% of the original 235U.
(found at 0.7% in ore)
Monday- Comparison of electricity costs and suitability- fossil, solar, wind, nuclear….
Wednesday-Efficiency (chapter 7),