[sdiy] help needed: thermal equations to RC networks analogy

[Czech Martin]

I must admit that my knowledge on the physics of thermal processes
is very very limited. This is certainly due to the fact that
I had no physics classes in school (no teachers available at first,
later the available I disliked).

I believe that a heat source plus thermal medium can be described
in electrical analogy:

temperature -> voltage
heat stream -> current
heat source -> voltage source
thermal isolation -> resistance
heat capacity -> capacitor

It's only a believe, but I'd like to know instead!

So ,e.g. a resistor firing a volume of air can be described
as a voltage source (voltage ~ total heat power),
and a RC network: a string of resistors, and from nodes
in between capacitors to ground.
If the whole is to take place in a package one needs some 
resistor to model heat losses to the outside world.

Problem:the voltage source will finally give voltage
to all nodes (i.e. heat will distribute).
But if the voltage is switched of, the voltage source
will draw current back from the network.
This would mean that a resistor that is not burning
any power input will take some heat current back
from the air, actually cooling it. ouch!
I guess I have to add an ideal diode to prevent 
back stream of current to the voltage source?

Please teach me!

m.c.