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wrote:
wrote:
Ian Stirling wrote:

... you would admittedly need a very large additional thermal mass -
a ton or two of water probably, to keep the heating on overnight,
with a 10-20C drop.

A decently designed solar space heating system would not be using water
in the first place. Picking hydronic for space heating is pretty much a
design death blow.

Secondly, an entirely different method would be used to maintain temp
after dark. There is a comfort zone, not just one fixed temp at which
people are cosy. Heat to as high in that zone as solar power provides,
and you have n hours after sundown of sufficient warmth. N depends on
design details.

Watching you wave your hands about solar heating is like watching
a 2-year-old draw a 300' tree with a 1" diameter trunk or hearing
an earthy-crunchy person say he can heat his house by running
rainwater from his roof through his microhydro plant :-)

Numbers give a sense of perspective in this energy newsgroup.

Nick

This house stays within comfort zone temp swing overnight. If you wish
to add some figures to this, take things forward another informational
step, great.

NT