wrote in message
...
daestrom wrote:

In Phila, we might let floor leakage supply half the heat on a 30 F day,
ie about (70-30)10 = 400 Btu/h. If the 6'x6' store is 150 F on an
average
day, it can supply 400 Btu/h through a (150-70)6'x6'/400 = R7.2 floor.

Not until you tell us how you're replenishing the heat in the under-floor
storage.

I've done that.


Maybe in your head, but you haven't posted them here.

It's easy for someone to just say that heat leakage up from the
under-floor
storage will *help* heat the building. But a *true* engineer would have
some detailed figures on that heat storage.

You got 'em :-)

Not in your listings that you've posted so far. Or are you confusing
another thread again?

Your original listing in this thread calculated the mass of water that would
be needed to provide 5 days of heat with no solar input, but it did not
calculate how long to charge such a tank with the sunspace outlined in the
design.

When circulating water from the tank to the sunspace, or overhead storage to
'charge' the underfloor storage, what is the temperature of the sunspace?
Obviously cooler than your listing calculated. How much cooler? Will the
overhead storage be heated enough for maintaining temperature during the
night if the bulk of the solar heat collected is pumped into the storage?
If the overhead isn't heated to around 155F, it won't have enough heat to
carry through till morning. Haven't seen any figures on that at all.

daestrom