[Trace-users] Warehouse configuration on Ashrae

[Scott Parker]

Scott H.,

For the spaces that are cooled, wouldn't the following highlighted section apply regardless of whether the conditioned space is 20,000 SF or not?  This would mean that you would essentially be breaking up the building into two parts:

1.       Non-mechanical cooling (System type 10/11)

2.       Mechanical cooling (System 3 or 4) - assuming that the cooled space is less than 25,000 SF

[cid:image002.png at 01CD8A77.7EA1D9D0]
Maybe I misinterpreted your email, but is seems that this situation of some mechanically cooled space in a predominately non-mechanically cooled space is taken care of by G3.1.1 item f (highlighted above) that was added with addendum dn to 90.1-2007 - no exceptions or minimum square footage is required.

Regards,
Scott P.


From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Hintz, Scott Fredrick. (KSC-ISC-4011)[URS Federal Technical Services, Inc.]
Sent: Friday, August 31, 2012 3:58 PM
To: Karen Smith; trace-users at lists.onebuilding.org
Subject: Re: [Trace-users] Warehouse configuration on Ashrae

Karen,

Can you follow Addendum dn in this case? (See attached.) This scenario is exactly why the ECB subcommittee drafted dn.

The warehouse area is the "predominant condition" for this building and unfortunately the non-warehouse area is less than 20,000 sqft which would have allowed Exception a of G3.1.1 to come into play. System 5 is the baseline system for the entire baseline building design. You could investigate if Exceptions b or c to G3.1.1 apply.

Is the warehouse heated with a total output capacity greater than or equal to 3.4 Btu/h*ft2? If yes then the warehouse is considered a conditioned space and must be both heated and cooled per section 10 of Table G3.1. (Note that letter d. of section 10 requires the Proposed to also be heated and cooled with a system identical to that of the baseline.) If no then the warehouse is not considered a conditioned space and its baseline system shall match the proposed. That would then also allow the non-warehouse area to fall under baseline system 3.

One last note. Even though you may be required to cool a space in your model that in reality is heated only, your cooling setpoints must be the same between the baseline and proposed but you're only required to have a 5o F dead band between your cooling and heating setpoints. 95o F is definitely 5o F greater than say 70o F. Food for thought... ;)

Scott Hintz
CEM, LEED-AP BD+C, BEMP

HVAC & Energy
Sustaining Systems Engineering (SSE)
[cid:image003.jpg at 01CB8011.2E333BA0]Federal Technical Services
Kennedy Space Center, FL
scott.f.hintz at nasa.gov<mailto:henry.d.turner at nasa.gov>

From: Karen Smith [mailto:skaren758 at gmail.com]
Sent: Thursday, August 30, 2012 3:57 PM
To: trace-users at lists.onebuilding.org<mailto:trace-users at lists.onebuilding.org>
Subject: [Trace-users] Warehouse configuration on Ashrae

Hi all,

Im a bit confused with the classification of Ashrae 90.1 2007, Im currently modeling a facility of a total of 47,600 SF including a 28,000 SF Warehouse. The facility includes 2 levels of offices, breakrooms, etc and a double height warehouse adjacent to them. The proposed design is composed of   2 AHUs, one for the first floor, one for the second and a only heating and ventilation system based on 2 boilers for the warehouse. According to this, the baseline should be a System 5 Packaged VAV with Reheat, Packaged rooftop VAV with reheat, Direct expansion cooling type and  Hot-water fossil fuel boiler for heating. One system per floor, but my confusion is on the part of the warehouse. Should I model an additional Cool and Heat System for the warehouse even though in the proposed we have it as only heating and ventilation system? If so, does it have to be the same type of system specified (System 5) or can it be System 3 or 4 instead?

Thanks.

Karen Smith
Sustainable Solutions, Inc
(404) 784.7061<tel:%28404%29%20784.7061>

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