[Equest-users] How to Claim Credits for Natural Ventilation in Multifamily High Rise Residential? (UNCLASSIFIED)

[Renshaw, Kevin M NWW]

Classification: UNCLASSIFIED
Caveats: NONE

The Advanced Energy Modeling For LEED Technical Manual discusses natural
ventilation in Appendix D.  I have never done this, so do not have any
experience on how well it works.

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ömer Moltay
Sent: Tuesday, January 24, 2012 10:18 AM
To: Joshua Chapman
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] How to Claim Credits for Natural Ventilation in
Multifamily High Rise Residential?

Dear Joshua,

Thanks for the info. Does this mean that it is not possible to claim credits
for natural ventilation?

When you say natural ventilation should be accounted for 24/7, are you
suggesting that both the baseline and proposed cases need to have continous
infiltration that corresponds to the natural ventilation (although this is
not realistic since residential units are never ventilated 24/7 by operable
windows). What about the cooling effects of this ventilation? Can eQuest
model heat loss and gain due to natural ventilation? Will this be taken into
account during simulation so that mechanical cooling is reduced in both
baseline and proposed cases because there is natural ventilation (and also I
presume there will be a substantial increase in heating energy if the spaces
are naturally ventilated 24/7 in winter)?

I would appreciate some more guidance on this.

Thank you very much,

Omer Moltay
Mimta

1/17/2012 7:58 PM, Joshua Chapman yazmış:
> Omer,
>
> First, your method for ventilation needs to be the same in the 
> baseline and proposed cases.  You will need to provide documentation&  
> calculations that shows each space within the dwellings complies with 
> Natural Ventilation requirements.  In Equest, the best way to account 
> for NV is to adjust your infiltration.  Change the internal loads to 
> account for 0.35 Air Changes per hour for each NV space, in the 
> baseline and proposed.  LEED reviewers are particular that natural 
> ventilation is accounted for 24/7.  If your HVAC fan runs continuously 
> this isn't a problem, but most residential systems are intermittent 
> and modeling natural ventilation as infiltration is the solution.
>
> Thanks,
>
> Joshua W. Chapman, P.E., LEED AP
> Scot Engineering Properties Inc.
>
>
> -----Original Message-----
> From: Ömer Moltay [mailto:omoltay at mimtarch.com]
> Sent: Thursday, January 12, 2012 5:25 PM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] How to Claim Credits for Natural Ventilation 
> in Multifamily High Rise Residential?
>
> Dear All,
>
> What is the methodology for LEED projects to claim credits (if
> possible?) for natural ventilation in dwelling units? In the building 
> I am working on, only openable windows are used for natural 
> ventilation, there is no engineered system. Cooling / heating will be 
> provided by VRF units. Can one make an assumption that occupied spaces 
> will be ventilated by natural means during the times they are occupied 
> in the proposed case, while for the baseline case mechanical ventilation
will apply?
>
> Thank you,
>
> Omer Moltay
> Mimta
>
>

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