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

[David BRADLEY]

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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