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Why solar water heating?
' v/ l7 b; Q3 P fAmount of energy used today to heat domestic water is enormous.' N# H. j+ @- I5 k
Compared to burning of fossil fuels, direct energy from the Sun produces heat
7 S% u$ R- X8 Cthat is almost free, environmentally clean and socially more acceptable.
8 ]- V$ D" l# D, N: Q6 ^, z' {0 [2 ?Possible energy savings for hot water in sunnier places are 80 percent or more2 L4 ~6 m3 `/ u+ Y/ `
and in cloudiest climates are from 50-60 percents. |
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发表于 2009-8-1 07:05:49
