[Bldg-sim] LEED & Natural Ventilation

[Timothy Moore]

Chris,

 

While you'll not be permitted to remove the cooling system for the
proposed building in the PRM analysis, you can design and operate the
building and systems as mixed-mode such that the cooling system never
runs. The catch is that you must use the same setpoints at any given
simulation time step for both proposed and baseline buildings. Thus, if
your mixed-mode control strategy would raise the cooling setpoint when
the outdoor ambient temperatures are elevated-e.g., to allow the
occupants to get whatever benefit they can from opening the windows,
stored cooling from thermal mass, etc.-you would need to use the same
reset strategy (i.e., tracking the OA temperature) for the cooling
control set points in the baseline building. Ultimately, the building
owner will then have to approve of the number of hours your model
indicates the building will operate with elevated cooling set points. 

 

Best,

Timothy 

 

 

 

 

Timothy Moore 
Special Projects 

timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 


**Design, Simulate + Innovate with the <Virtual Environment>**

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris
Sent: Thursday, July 29, 2010 11:24 AM
To: Rimes, Christie
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] LEED & Natural Ventilation

 

And how did you model the natural ventilation?

In summer when external temperatures are above the room setpoint natural
ventilation during the day would not provide any cooling.

On Thu, Jul 29, 2010 at 11:19, Rimes, Christie <
Christie.Rimes at wspfk.com> wrote:

I am currently doing a naturally ventilated building for LEED and I
believe that if the space is achieving indoor temperatures between the
given set point using natural ventilation than the mechanical system
energy is 0 for the proposed design. Any hours where natural ventilation
can't achieve indoor temperatures within the set points, a mechanical
system needs to be modeled even if there isn't one in the proposed
building. This helps keep the unmet hours within the requirements for
LEED.

 

Cheers,

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:
bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris
Sent: Thursday, July 29, 2010 11:13 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] LEED & Natural Ventilation

 

All,

 

we regularly design and model buildings which rely in part on natural
ventilation as a source of free cooling. The issue we are often faced
with is how to capture this benefit when performing a LEED Appendix G
analysis. Appendix G states that all conditioned spaces must have BOTH
heating and cooling. We would like to remove mechanical coolig in the
proposed design building and thus gain benefit when comparing to the
mechanical cooling system in the reference baseline building.

 

Has anyone tackled this issue and come to a satisfactory resolution? 

 

Thanks for your help.



-- 
Chris Flood BSc (Eng)
Senior Building Analyst & Energy Modeller




-- 
Chris Flood BSc (Eng)
Senior Building Analyst & Energy Modeller

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