In an earlier contribution to this discussion,
Dave Liquorice wrote:

On Wed, 15 Jul 2009 18:56:49 +0100, Tim Lamb wrote:

20m3/day or 833kg of water per hour. Extract 5deg. C is how much
energy?

Specific heat capacity water 4.187 kJ/kgK

20000 * 5 * 4.187 = 418.7MJ

Yes, that answers the question asked - "how much energy per day?"

However, a more useful calculation would be the *rate* of extracting energy
(i.e. power) in kW. Have you worked that out?

[I'd be interested to know whether your calculation arrived at the same
result as mine].
--
Cheers,
Roger
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