Re: [TRNSYS-users] problem with control using type 2d

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

Talib,
  Type2 models a differential temperature controller. It's control decision is based on the difference between two values no matter what the magnitudes of those values are. A typical thermostat makes a control decision by comparing the magnitude of two values (not just the difference). While you can use a type2 to model a thermostat, I think it would be easier in your case to use Type108 (Controllers: 5-Stage Room thermostat.)
Regards,
 David

On 12/7/2012 05:36, Talib Ahmadu wrote:

Dear all,

I want to create a control for a multizone building cooling model using type 2d. I have used an absorption chiller, type 107. I want the chiller on when the temperature in the zones exceed 24C and off when the temperature falls below 19C. These are my inputs.

Upper input value= Tzone

Lower input value=0

Upper dead band=24

Lower bead band=19

I tried this for a single zone but it didnt seem to work well. I have 9 zones in the building, my problem is how to connect all zone temperatures to Upper input value.

Please i need to know if this strategy is correct and how i can connect all zone temperatures. Suggestions will be appreciated. Thanks

Talib.

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