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Fabien,<br>
I would think that you would definitely need a different model for the
evacuation pipes; the energy transfer characteristics of a partially
liquid filled pipe and from a completely filled pipe are quite
different and I think it would be important to characterize the liquid
to soil, air to soil, and liquid to air energy transfers separately. <br>
Kind regards,<br>
David<br>
<br>
<br>
fabien.hachet wrote:
<blockquote
cite="mid:15711225.3043.1268833606011.JavaMail.www@wwinf8210"
type="cite">
<p align="left">Dear Trnsys users </p>
<p align="left"> </p>
<p align="left">I'm trying to simulate a system which allows to
recuperate heat of waste water for collective housing. In the
simulation, I need to use distribution and evacuation pipes. For that
purpose, I use a type 709. However, during the simulation, I noticed
that trnsys considered that pipes are always filled with water.
Actually, evacuation pipes are not completely filled and the water
velocity is higher (1m/s) because the surface is smaller. Consequently,
these pipes don't take into account the great coefficient of heat
transfert (conduction, convection anr radiation).</p>
<p align="left">So, I would like to know if it is possible to take
into account these coefficients and if I can choose the velocity of
water (and not the flow rate) without changing the surface of the pipe ?</p>
<p align="left">Moreover, it is a real problem because the duration
of waste water evacuation is several hours whereas the duration must be
a few seconds.</p>
<p align="left"> </p>
<p align="left">Thanks</p>
<p align="left"> </p>
<p align="left">Regards</p>
<p align="left"> </p>
<p align="left">Fabien</p>
<br>
<br>
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