[Bldg-sim] TRACE modeling question - Heating Only

Wed May 19 12:43:05 PDT 2010

A heating only system is permitted in the baseline ONLY if the space(s) being served are categorized as semi-heated. 90.1 defines a semi-heated space as "an enclosed space within a building that is heated by a heating system whose output capacity is greater than or equal to 3.4 Btu/h*ft2 of floor area but is not a conditioned space."

So if it's more than that then it's a conditioned space. Conditioned spaces must follow the baseline system rules of G3.1.1 and must be heated and cooled.

An unconditioned space must follow Table G3.1 #12 for modeling exhaust fans to be the same between the baseline and proposed. In the Create Rooms, Rooms tab, the room type can be set to conditioned or unconditioned.

Bob Fassbender, LEED AP
Trane C.D.S.
(608) 787-3926

-----Original Message-----
From: Clark Denson [mailto:cdenson at ssr-inc.com]
Sent: Tuesday, May 18, 2010 2:00 PM
To: Eurek, John S NWO; Bishop, Bill; Fareed Syed; Snarski, Marty; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] TRACE modeling question - Heating Only

I like your approach.  Was this for a LEED job?  If so, did the USGBC

reviewer like it?  That's the important question that next needs

answering.

Thanks,

Clark Denson, PE, CEM, LEED AP

SSRCx, LLC

(615) 383-1113

-----Original Message-----

From: Eurek, John S NWO [mailto:John.S.Eurek at usace.army.mil]

Sent: Tuesday, May 18, 2010 12:21 PM

To: Bishop, Bill; Fareed Syed; Snarski, Marty;

bldg-sim at lists.onebuilding.org

Subject: Re: [Bldg-sim] TRACE modeling question - Heating Only

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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