[TRNSYS-users] Type 4 as an equilibrium bottle

[David Bradley]

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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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
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Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
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