[TRNSYS-users] Top control in the Type 56

[David BRADLEY]

Heloise,
   If you are using the automatic heating and cooling types that are 
built into Type56/TRNBuild then these only pay attention to the zone air 
temperature in order to compute the sensible load on the space. The 
control of those components is assumed to be instantaneous and ideal. If 
you are simulating a building and an actual HVAC system then you can set 
up the HVAC system to pay attention to whatever Type56 output variables 
that you want (including operative temperature). PID control is possible 
using Type22 but in my experience a lot of portions of the HVAC system 
are based on ON/OFF control (Type108). When implementing controls of any 
kind you need to make sure that your timesteps are small (1 to 5 
minutes); recall that TRNSYS can make one control decision per timestep 
and then it must stick with that decision until the next timestep.
Regards,
  David


On 11/8/2010 10:25, Heloise PELEN wrote:
>
> Dear TRNSYS users,
>
> The Type 56 uses a control on the air temperature « TAIR » to compute 
> the sensible heat demand of each thermal zones.
>
> This temperature does not include the surface temperature and doesn't 
> fully describe the temperature actually felt by the human, body.
>
> Is there a way to control the operative temperature, rather than on 
> the air temperature, in type 56 ?
>
> I thought about using Type 22 but the simulation seems rather unstable 
> with more than on Type 22, and I would like to be able to control the 
> operative temperature in each thermal zones.
>
> Thanks for your help !
>
> Best regards,
>
> *Héloïse Pelen*
>
> *ETAMINE*
>
> *etamine_mail*
>
> 	
>
> heloise.pelen at etamine.coop <mailto:heloise.pelen at etamine.coop>
>
> 75 rue de la Villette - 69003 Lyon
>
> Std : 04 37 45 34 20 / Fax : 04 37 45 41 38
>
> Ld : 04 37 45 34 13 / Port : 06 65 07 41 77
>
> 	
>
> Visitez notre site web : www.etamine.coop!
>
>
> _______________________________________________
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> TRNSYS-users at cae.wisc.edu
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

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

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