[Equest-users] In Appendix G comparisons are air side economizersrequired in IDF/Electrical Rooms

[Bishop, Bill]

Hi Connor,

 

Since G3.1.2.6 already lists the exceptions that apply to the economizer
requirement, I don't think you should try to claim additional exceptions
based on the Prescriptive Path Section 6.5. While I agree that it might
be unreasonable to expect an owner to install an economizer on a small
PSZ unit, the Appendix G Baseline requirements do not necessarily
represent what an owner would typically do. The flip side of your
situation is that a zone with a low cooling capacity should not penalize
your Proposed design too badly if the Baseline has an economizer but the
Proposed doesn't. You can minimize any penalty by using a higher cooling
T-stat setpoint in both models (assuming your electrical room is not to
be kept at comfort conditions).

 

Regards,

Bill

 

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jansen,
Connor
Sent: Tuesday, July 12, 2011 4:04 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] In Appendix G comparisons are air side
economizersrequired in IDF/Electrical Rooms

 

Hello All,

 

When performing a 90.1 2007 Appendix G energy model, the baseline system
for the building appears to call for a packaged single zone air handler
and an airside economizer for individual IDF and Electrical rooms. The
proposed systems are designed as FCUs. Although not addressed in
Appendix G, section 6.5.1, would appear to exempt the airside
economizers in rooms requiring a low cooling capacity. 

 

With that said, is it correct to reference other parts of ASHRAE 90.1
(prescriptive path Sec 6.5) when performing a performance based Appendix
G energy cost comparison?

 

Your help and clarification would be much appreciated. I apologize if
this is not the correct forum for this post and would be greatly obliged
if you were to direct me to the correct forum.

 

Regards,

 

Connor

 

 

Connor Jansen, PE

Built Ecology Specialist

405 Howard Street

Suite 500            

San Francisco CA 94105

T.   +1 415 398 3833

D.  +1 415 402 2721

F.   +1 415 433 5311

E. connor.jansen at wspfk.com <mailto:connor.jansen at wspfk.com> 

W. built-ecology.com <http://www.built-ecology.com/> 

 

 

A specialist service of WSP Flack + Kurtz

 

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