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re: hair brained solar cistern???
18 dec 2002
news wrote:
>the figures can't be argued with, that is clear. it does work, although
>there is room for improvement...
i'd say there's a lot of room. this would be clearer without the woodstove.
>what will the results be when the sand dries out, if it does? this we may
>not ever know as a moisture sensor is not used in the sand to record data.
it might be easy to add 2 electrodes and a solenoid valve and a soaker hose.
>it is clear nicks approach is 100% solar heating with enough thermal storage
>to take it through 3 or 4 cloudy winter days.
i'd say 5... if the sun is a coin flip and windows can keep the house warm
on an average december day, 1 day's storage limits the solar heat fraction
to about 50%, 2 makes 75% max, 3 makes 88%, 4 makes 94%, and 5 makes 97%.
nick
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