Re: [TRNSYS-users] Temperature and %RH setpoint TRNBUILD

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

Gary,
  The equation that I wrote was for a heating set point temperature and you are correct, when the building is unoccupied, the temperature would be allowed to fall back to 12C.

  The cooling equation might be:

Tset_cool = 28*occ + 99*(1-occ)

  In other words, define the cooling set point as an arbitrarily high number that the building will never reach.  There are of course other ways of turning off the cooling but this is effective in your situation.
Best,
 David

On 9/18/2012 18:57, KUM GARY wrote:

David,
Thanks for your reply. From your equation, it seem that during period of 0 occupancy, I would get a temperature of 12 degree. But I would like the cooling to be switched off when there is no occupancy. So how should I go about defining the equation?

Thanks
Gary.

On Sep 19, 2012 4:00 AM, "David BRADLEY" <d.bradley@tess-inc.com> wrote:

Gary,
  Defining your setpoint as a SCHEDULE in TRNBuild simply allows you to set a value that depends upon the time of day. Defining your setpoint using an INPUT allows you a good bit more flexibility. You could define your equation as follows:

Tset_heat = 24*occ + 12*(1-occ)

occ would have to be defined in another equation or perhaps a Type14 forcing function to have a value of 1 when the building is occupied and a 0 when it is not occupied.

Best,
 David
  

On 9/17/2012 10:29, KUM GARY wrote:

Hi,

I trying to calculate the cooling demand of my office building in TRNBUILD and would like the cooling demand to response according to my occupancy schedule(less cooling at night and more cooling at day). I try to define the set temp at the cooling type by i not sure which one should i use (schedule or input?) And also the equation behind it, because when i enter like for instance 24degree(set temp) *occupancy schedule+0, i would get 0 degree when there is no occupancy.

Appreciate your kind assistance on this

Gary Kum

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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@tess-inc.com

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

-- 
***************************
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@tess-inc.com

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