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Lecture 6 Energy Exchange & Winter

# 10 per kwh l 1kwh 36 x 106 j l 36 x 106 21 x 103

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Unformatted text preview: water for: l༆  35 x 106 / 21 x 103 l༆  1,666 ﬂushes, or 10,000 litres (1,666 ﬂushes x 6l/ﬂush) l༆  With a generator with 25% conversion eﬃciency we get 416 ﬂushes only l༆  At \$1.30/l of gas means 0.31 cents per ﬂush. A Bit More Prac?ce….. l༆  With an electric pump? l༆  Roughly same eﬃciency conversion from natural gas to electricity (a bit higher maybe) l༆  Cost to you is \$0.10 per kWh l༆  1kWh = 3.6 x 106 J l༆  3.6 x 106 /21 x 103 = 171 ﬂushes l༆  \$0.10 / 171 = 0.058 cents per ﬂush Once you Know…. Ice Forma?on l༆  Thermal conduc?vity is deﬁned as the quan?ty of heat (Q) transmiged through a unit thickness (L) in a direc?on normal to a surface of unit area (A) due to a unit temperature gradient (ΔT) l༆  Thermal Conduc?vity λ = Q × L / (A × ΔT) where Q = heat, L = depth of material...
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