[Equest-users] natural ventilation scenario and LEED

[Maria Karpman]

I would contact USGBC or search CIRs to establish rules that apply to the project. From 90.1 perspective, Appendix G shouldn’t be used: “…G1.1 Performance Rating Method Scope. ….this appendix is provided for those wishing to use the methodology developed for this standard to quantify performance that substantially exceeds the requirements of Standard 90.1. It may be useful for evaluating the performance of all proposed designs, including alterations and additions to existing buildings, except designs with no mechanical systems.“ That said, I would be surprised if this disqualifies the project from getting LEED certification. If there are no conditioned spaces and all you have is lighting and some process loads, you should be able to calculate savings in a simple spreadsheet since there are no interacting systems. If USGBC asks you to model it (I really can’t think of a reason why though…), you’d model it as unconditioned in both the baseline and proposed designs, so it wouldn’t matter whether the windows are operable or not. Please keep us posted about how this is resolved. I am curious what LEED policies are for such projects. 

 

Maria 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Christian Stalberg
Sent: Friday, November 22, 2013 3:00 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] natural ventilation scenario and LEED

 

Joe,

 

Okay let me elaborate further.

 

This high bay warehouse building has no HVAC whatsoever. Not even ventilation fans. Only fixed openings distributed across the walls and at the roof. I do not know if LEED specifies modeling only operable windows, but that is the example they give in their guidebook. Again, I do not know if this building would even qualify as enclosed space and therefore be eligible for modeling. I have looked everywhere including the LEEDuser forum and am unable to shed light on this issue. 

 

Regards,

_

Christian Stalberg

Natural Intelligence, LLC

http://naturalintelligence.us

Tel. 415.531.4610

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Friday, November 22, 2013 10:58 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] natural ventilation scenario and LEED

 

Christian,

I'm still unclear what is the conundrum.  Is it that LEED modeling rules only specify operable natural ventilation, or that you're unclear how to model fixed, i.e., uncontrolled,  natural ventilation?

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 11/21/2013 4:58 PM, Christian Stalberg wrote: 

I’m getting no responses on the bldg-sim list so am trying here too. 

  

I have a factory/warehouse that is using natural ventilation for cooling. What is unusual is that the openings are fixed openings. 

  

At first glance it seems that it would not even qualify as an enclosed space and therefore would not be eligible for energy modeling for LEED. The project is registered at USGBC however, of course I realize that may mean nothing. 

  

If this project could be eligible for LEED certification, I am trying to come up with an approach and all I can think of is pretending the openings are operable and then following the guidelines as outlined in the Advanced Energy Modeling for LEED handbook. 

  

I would appreciate any guidance anyone can offer on this seeming conundrum! 

  

_ 

Christian Stalberg 

Natural Intelligence, LLC 

http://naturalintelligence.us 

Tel. 415.531.4610 

  

  

 
 
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