On Oct 31, 4:15*am, Don Foreman wrote:
On Fri, 30 Oct 2009 14:49:38 -0700 (PDT), "

wrote:
Incidentally the problem can not be
accurately described by lump constants. *The electrical analogy is a
transmission line, not a capacitor.

* * * * * * * * * * * * * * * * * * * * * * * * * * * *Dan

An accurate simulation is far more complex than any simple models
using leaky buckets, capacitors or transmission lines. *Building such
a simulation that actually did show good correllation with observed
(measured) *behavior in a range of buildings and climates took some
very competent senior engineers a couple of man years and a whole
bunch of programming. *

Right. The transmission line analogy is a significant step closer
than a capacitor and works well enough when one is working with
something simple as a homogeneous mass surrounded by insulation. A
house is not homogeneous and then there are other things as solar
gain.

My current house has significant solar heat gain. On a sunny day the
outside temperature can be about 40 degrees and the house will be
comfortable with the furnace turned off. I take the window screens off
in the Fall to maximize the solar heat gain.

Dan