[TRNSYS-users] Regarding the use of Type 2: aquastatC controller

David BRADLEY d.bradley at tess-inc.com
Tue May 25 08:39:23 PDT 2021


Ashmin,

  The controller can make one control decision per time step. When the 
controller decides to turn on the cooling equipment then the cooling 
equipment has to stay on for 5 minutes, driving the temperature of the 
space downwards, perhaps beyond the limit of the dead band. If you use a 
1 minute timestep instead then the controller has a chance every minute 
to turn the cooling equipment back off, limiting the temperature 
overshoot in the building.

kind regards,

  David


On 05/25/2021 08:01, asmin aryal wrote:
> Dear Sir,
> I am cooling type 56 building with type  type 752 (Simple Cooling Coil 
> Using Bypass Fraction Approach; Temperature Controlled) by introducing 
> the cool air via ventilation to type 56.
>  I am controlling the room air temperature by type 2: aquastatC 
> controller. When i run the simulation with 5 min time step, the 
> controller cannot control the room air temperature within the dead 
> band but when i run the simulation with 1 min time step it can control 
> the room temperature within the dead band.
> What may be the possible reason.
> Looking forward to your answer.
> image.png
>
> image.png
> Sincerely
> Ashmin Aryal

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems 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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