[Equest-users] Gas INFRA-RED radiant heater

[Nick Caton]

All,

To play devil's advocate:  If you feel a LEED reviewer would approve of modeling a cooling system that simply doesn't do anything, what about simply not define a cooling thermostat schedule?  Makes capacity and unmet hours  both non-issues and the thing will never expend energies trying to cool.  As always, baseline thermostat schedules (or lack thereof) should match the proposed.

That said, I'm going to stir the pot and say I'm not advocating this approach.  My reading of 90.1, independent of LEED reviewer commentary, is we're supposed to actually heat and cool all conditioned spaces in the proposed design, even if only heating or cooling is provided.  Providing cooling or heating means in the system set up to never cool or heat misses the point*.    I have not tried addressing the issue in that fashion under a LEED review (on the contrary, I cooled the space in a baseline-equivalent fashion).  I can only caution a reviewer may not agree with the less conservative interpretation - if others have experienced otherwise, please share!

~Nick

*PS:  Honestly I can only speculate, but I think the "point" of this rule is to not permit an 'unfair' advantage for buildings which do not require heating or cooling for a given area, relative to other buildings going through the performance rating method.  If that's truly the goal, I personally think it would be more elegant to simply have the baseline follow the proposed design's conditioning requirements.  As it stands, it sort of "punishes" building owners/designers for saving energy by recognizing designed conditions of comfort can and should vary by space function.


[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Howe, Timothy
Sent: Friday, June 08, 2012 12:21 PM
To: Karen Walkerman; Pasgar, Arash; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Gas INFRA-RED radiant heater

That creates unmet load hours.


Timothy Howe, MS, LEED® AP BD+C
Mechanical Engineer
Stantec
61 Commercial Street
Rochester NY 14614
Ph:   (585) 413-5347
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Cell: (585) 330-8681
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From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Karen Walkerman
Sent: Friday, June 08, 2012 1:05 PM
To: Pasgar, Arash; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Gas INFRA-RED radiant heater

... so set it to 1
On Fri, Jun 8, 2012 at 1:00 PM, Howe, Timothy <Timothy.Howe at stantec.com<mailto:Timothy.Howe at stantec.com>> wrote:
Karen,

Unfortunately that does not work.  Setting the capacity to zero will just make the program autosize it for you. The only way to prevent the cooling from activating is through the thermostat setting.

Tim.

Timothy Howe, MS, LEED® AP BD+C
Mechanical Engineer
Stantec
61 Commercial Street
Rochester NY 14614
Ph:   (585) 413-5347<tel:%28585%29%20413-5347>
Fx:   (585) 272-1814<tel:%28585%29%20272-1814>
Cell: (585) 330-8681<tel:%28585%29%20330-8681>
stantec.com<http://www.stantec.com>

The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.

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From: Karen Walkerman [mailto:kwalkerman at gmail.com<mailto:kwalkerman at gmail.com>]
Sent: Friday, June 08, 2012 12:49 PM
To: Howe, Timothy
Cc: Pasgar, Arash; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Gas INFRA-RED radiant heater

"Technically you need to model both heating and cooling in the baseline and proposed"

... only for LEED models.

You can also model a different HVAC system that includes cooling (and allows for a baseline), and simply set the cooling capacity to 0.

--
Karen

On Fri, Jun 8, 2012 at 12:39 PM, Howe, Timothy <Timothy.Howe at stantec.com<mailto:Timothy.Howe at stantec.com>> wrote:
Technically you need to model both heating and cooling in the baseline and proposed


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