David,<br><br>I have try to define the cooling equation in TRNBUILD but unfortunately, i am unable to do so as it only allow me to input a constant after the addition(99*(1-occ)) which mean i can only define as Tset_cool = 28*occ + constant value. How should i go about to solve this? <br>
Pardon me as i am still new in the software.<br><br>Thanks<br>Gary<br>
<br><br><div class="gmail_quote">On Wed, Sep 19, 2012 at 10:26 PM, David BRADLEY <span dir="ltr"><<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Gary,<br>
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.<br>
<br>
The cooling equation might be:<br>
<br>
Tset_cool = 28*occ + 99*(1-occ)<br>
<br>
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.<br>
Best,<br>
David<div><div class="h5"><br>
<br>
<br>
<div>On 9/18/2012 18:57, KUM GARY wrote:<br>
</div>
<blockquote type="cite">
<p>David,<br>
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?</p>
<p>Thanks<br>
Gary.</p>
<div class="gmail_quote">On Sep 19, 2012 4:00 AM, "David BRADLEY"
<<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Gary,<br>
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:<br>
<br>
Tset_heat = 24*occ + 12*(1-occ)<br>
<br>
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.<br>
<br>
Best,<br>
David<br>
<br>
<br>
<br>
<div>On 9/17/2012 10:29, KUM GARY wrote:<br>
</div>
<blockquote type="cite">Hi,<br>
<br>
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 <u>24degree(set
temp) *occupancy schedule+0</u>, i would get 0 degree
when there is no occupancy. <br>
<br>
Appreciate your kind assistance on this<br>
<br>
Gary Kum<br>
<br>
<fieldset></fieldset>
<br>
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<pre cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:<a href="tel:%2B1.608.274.2577" value="+16082742577" target="_blank">+1.608.274.2577</a>
F:<a href="tel:%2B1.608.278.1475" value="+16082781475" target="_blank">+1.608.278.1475</a>
<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>
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