Re: [TRNSYS-users] Type 4 as an equilibrium bottle

[Michel Bernier <michel.bernier@polymtl.ca>]

Hi,

Are you referring to a ?bouteille casse pression? 
(a bottle to break the pressure) when you mention
equilibrium bottle ? 

A  ?bouteille casse pression? is usually inserted between
a primary and a secondary pumping system to hydraulically 
decouple both systems. 
The most common term used in english is "common pipe" 
(see for example ASHRAE handbook-2000, page12.12 fig. 23) 
It is not a "tank" but usually as the form of an oversized
pipe
with several inlet/outlets. You may want to model 
the ?bouteille casse pression? as a flow mixer similar to type11d 
or as a small type4 tank. 

Voila !

Michel Bernier

P.S A similar question was asked on this forum on : Tue, 13 Jan 2004
13:12:27 
***************************************
Michel Bernier ing., Ph.D.
Professeur
Departement de genie mecanique
Ecole Polytechnique de Montreal
Case Postale 6079, Succ. "Centre-Ville"
Montreal, Quebec Canada
H3C 3A7
Tél: (514) 340-4711 ext: 4381
Fax: (514) 340-5917
e-mail:michel.bernier@polymtl.ca
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At 09:13 2006-03-06, David Bradley wrote:
> Hello Amandine,
>
> > Is
> > the Type4 (storage tank) adapted to model an equilibrium
> > bottle?
>
> I am not 100% certain what you mean by an equilibrium bottle. However,
> Type4 is able to model any sized vertically cylindrical liquid filled
> vessel provided that the volume of liquid inside the vessel does not
> change. Type4 assumes that the vessel is always completely full. If you
> need a variable volume tank, you can consider the use of Type39.
>
> > I did
> > not manage to understand how Type4 is operating without any heating
> > element or heat exchanger;
>
> The questions that you must answer in the TRNSYS Studio proforma can be a
> little confusing. The easiest way to model a tank with no heating element
> is to simply set the two "heating element power" parameters
> each to zero. In that way, no matter what happens in terms of the tank's
> controls, the elements are unable to provide any energy to the liquid. I
> would not suggest answering the question "how many heating elements
> to be modeled in this tank?" with 0 - simply leave the default
> answer as "2." 
>
> The way that the Type4 parameters are set up by default when you drag out
> a new proforma into your simulation is without any heat exchangers so I
> don't think that you need to do anything about those.
>
> Kind regards,
>  David
>
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