[Bldg-sim] TRACE modeling question - Heating Only

[Eurek, John S NWO]

What I did in Trace....

I have a mechanical room which I was going to cooled with exhaust fans and no
mechanical cooling.  To do this, I set the infiltration equal to the exhaust
cfm in the Airflows tab.  I then set the infiltration schedule and exhaust
schedule to be 100% whenever the mechanical room temp was above 80 degrees.
(You will have to create a schedule.)

Modeling the exhaust cooling as infiltration worked best since the air
travels from the outside directly to the room without going through any
mechanical divice. (Coils, filters, fans....)  

I also made a coiling unit can called it "pretend" and had the set point 100
degrees.  (So it would never turn on.

..... I then made the baseline without the exhaust system, so it would have
to mechanically cool the mechanical room to 100 degrees.


-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Tuesday, May 18, 2010 9:45 AM
To: Fareed Syed; Snarski, Marty; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] TRACE modeling question - Heating Only

Marty,
 
I usually model heating-only systems in my proposed model as PTAC systems for
Appendix G. I use a high cooling thermostat temperature in the proposed and
baseline models to minimize cooling energy in those spaces.
 
Regards,
Bill
 
William Bishop, EIT, BEMP, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P May is National Bike Month. Bike to Work Day May 21st.
________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Fareed Syed
Sent: Tuesday, May 18, 2010 10:36 AM
To: Snarski, Marty; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] TRACE modeling question - Heating Only
 
In my past experience, I had assigned those heated only spaces to VAV systems
for the baseline model. I think that's the most appropriate way of complying
Appendix G. And this way it went through without any comments from the
reviewer.
 
Thanks,
 
Fareed
 
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Snarski, Marty
Sent: Tuesday, May 18, 2010 10:34 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] TRACE modeling question - Heating Only
 
Hello, everyone.
 
I've got a question that I've never been clear on and figured I'd turn to the
experts (you all).
 
In appendix G, Table G3.1.1b, it's stated that all conditioned spaces shall
be modeled as being both heated and cooled, even if no cooling systems
exists, for both the proposed and baseline buildings.
 
We typically place Cabinet Unit Heaters in stairways and vestibules, and
don't worry about cooling those spaces.  So, my question is, though TRACE has
a couple "Heating only" systems options, Appendix G says that these cannot be
selected.  So, what is a common solution?  The other systems in the building
are VAV, so, can those spaces just be grouped on to there?
 
Thanks for any advice you'd have!
 
 
Martin Snarski   LEED(r) AP 
Mechanical Engineer 

SHWGROUP 
 
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