[TRNSYS-users] Simulation of a cooling tower using type 510 and link a cooling load to it

[David BRADLEY]

Susanne,

  You're correct that you'll need some model of a delivery device 
between the cooling loads and the cooling tower. The most rigorous way 
to model the system would be to get away from loads entirely, make a 
Type56 model of the building in temperature level control and explicitly 
model the ceiling panels with their controls on inlet water temperature 
and the model of the cooling tower all in one project.

  If implementing the building model in Type56 is not feasible because 
you already have zone loads from some other software tool then you can 
use Type682 in the TESS Libraries (or an equation) to impose those loads 
onto the water flow that comes from the cooling tower. What 683 does is 
to take the load and the inlet temperature from the cooling tower and 
return the outlet temperature that goes back to the cooling tower.

  With this second method, however, you'll need some way of estimating 
the effectiveness of the ceiling panels so that you can convert the zone 
loads to the loads that will be seen by the tower. One method would be 
to find a ceiling panel model and give it the entering water temperature 
and flow rate as well as the air setpoint temperature. The model will 
hopefully be able to then give you a panel efficiency that you can feed 
to an equation that modifies your zone loads before passing them to 
Type682. If you don't have a ceiling panel model then you could assume a 
constant effectiveness for the panels and modify your loads accordingly.

kind regards,

  David


On 05/31/2022 07:42, Susanne Urlaub via TRNSYS-users wrote:
> Hi everyone,
>
> I have a question about the simulation of a cooling tower in TRNSYS. My
> focus question is what fluid outlet temperature the cooling tower is
> able to deliver in combination with a certain cooling load of a whole
> building. The building is equipped with ceiling panels for which the
> fluid outlet temperature of the cooling tower is the input as supply
> temperature of the ceiling panels corrected for dew point control. I
> tested out the Type 510 from the TESS Libraries. How is it then possible
> to link the cooling load from the building with the cooling tower?
> Probably I have to build the ceiling panels with another type? Or is it
> possible to read in a external load file?
>
> Any help, suggestions or advices are highly welcome!
>
> Many, many thanks in advance.
>
> Susanne
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
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