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

[David BRADLEY <d.bradley@tess-inc.com>]

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.

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@tess-inc.com

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