[TRNSYS-users] Type 2b auxiliary heater of a stratified storage tank

[mcdowell at tess-inc.com]

Rajaa - 

I am not clear on what you are trying to accomplish with
your model. 

If you are trying to model a tank in an environment with a
constant temperature, you can just set the environmental temperature
inputs to the tank model to a constant 55C. 

Type 6 is intended to
model the heating of a fluid stream and not the air surrounding a tank.


Regards, 

Tim 

---
Timothy P. McDowell
Executive Vice
President
Thermal Energy System Specialists, LLC
22 N Carroll St, Suite
370
Madison, WI 53703
608-274-2577

On 2013-04-10 12:17, Rajaa Badaoui
wrote: 

> Hi everybody,
> 
> I'm stuck with trying to control the
outside temperature of a stratified storage tank (type534) with the
controller type2b and the auxiliary heater type6. When i first connect
only the auxiliary heater to the tank, the auxiliary heater was ON only
when there was a flow stream. Then i connected a controller to maintain
the auxiliary heater even if there is no flowrate. the outside storage
tank temperature has to be always at 55°C. But sometimes the outside
temperature of the tank is lower than 55°C. I think i put a sufficient
maximum heating rate in the type6. I connected the tank nodal
temperature to the lower input temperature of the controller 
> I set
the upper input temperature of the controller to 55°C
> 
> Can somebody
help me to understand why i can't maintain the outside temperature at
55°C?
> 
> I'll be grateful for any advice
> 
> Thanks in advance
> 
>
Rajaa
 
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