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Dear Jeff,
I have the same problem: writing model that communicate with Type
56.
I'm very intersted by your way to do it, because
you say you have a good feed back "with excellent results".
I suppose you can do this if the boundary wall
computed in type56 is thin enough to use a steady state asumption?
I have chosen an other method. In spite of
using "the inside roof surface temperature (an output
from Type 56) and the
resistance (1 / U value)" , I use the
"energy to the outside surface..." (QCOMO, output Ntypes20 of type56) as input
of the model I create.
Do you think it's an acceptable
solution?
It 's very new so I don't have enough results and
comparisons to evaluate this method.
Laurent
----- Original Message -----
Sent: Thursday, April 22, 2004 6:20
PM
Subject: Re: Interfacing facade
collectors, Trombe walls, etc. with type56
At 02:55 PM 4/22/2004 +0200, you wrote:
>Is there a
standard method to properly interface the back side of external
>elements such as facade collectors, Trombe walls, transparent
insulation
>walls, etc. with type56? I am familiar with the more or
less complicated
>method to interface type160 floor heating (Fort,
Transsolar) with type 56
>and suppose it could generally be solved this
way. In this case the entire
>external wall would have to be included
in the model of the facade
>collector, which is not desirable. Is there
any other method? E.g. is
>there an established method to connect the
backside of a facade collector
>to the external surface of an external
wall? Thank you.
While I can't say that I am familiar with the method
used by Type 160, I do
have some experience writing models that
communicate with Type 56; most
recently some building-integrated
photovoltaic systems. The method we used
to solve the problem was to
have the BIPV model calculate the interface
temperature between the back
of the BIPV collector and the outer
roof surface. To
accomplish this you need to provide the BIPV model with
the inside roof
surface temperature (an output from Type 56) and the
resistance (1 / U
value) of the roof material. The BIPV model then
performs its
thermal calculations and provides the temperature between the
outside of
the roof and the back of the collector to Type 56 as the
boundary
temperature for a boundary wall. Type 56 then iterates with this
given boundary temperature and calculates a new inside surface temperature
which is then sent back to the BIPV model and the iterative process
continues.
We have used this technique with radiant slabs, slabs on
grade, basement
models and a few other models with excellent
results. Feel free to e-mail
me if you have any further
questions.
Jeff
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Thermal
Energy System Specialists (TESS)
Jeff
Thornton
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