[Equest-users] Unmet Hours

Paul Diglio paul.diglio at sbcglobal.net
Thu Jul 7 08:17:45 PDT 2011


Brad:

Please see attachment.  It is a excerpt from 90.1-2010 that clarifies the 
definition of an unmet load hour.

If the 250 unmet hours in each zone occur at the same time, you would have only 
250 unmet hours.

Paul Diglio




________________________________
From: "Patrick J. O'Leary, Jr." <poleary1969 at gmail.com>
To: Brad Robinson <brad.robinson at yahoo.com>
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Thu, July 7, 2011 10:56:08 AM
Subject: Re: [Equest-users] Unmet Hours

 that would be 500 unmet hours.

the bigger leed review problem i've had is when i have more unmet hours in one 
category in the proposed (like 200 unmet in cooling) and fewer unmet hours in 
the other (like 0 in heating) but the baseline is opposite.  certain leed 
reviewers think this is a problem.  the 90.1 requirement addresses the unmet 
hours per the entire building design (both heating and cooling) not heating and 
cooling individually.

On 7/7/11 7:49 AM, Brad Robinson wrote: 
For LEED compliance under ASHRAE 90.1, are the 300 unmet hours the sum of all 
the unmet hours in each zone, or the peak per zone?  In other words if I have 
250 unmet hours in one zone and 250 unmet hours in another zone, does this 
comply, or is it considered 500 unmet hours total?  By zones, I mean thermal 
zones served by the same air handling unit.  Thanks.
>
>
>
>Brad Robinson
>
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