[Equest-users] Unmet Hours

[Robert E. O'Connell]

Brad,

I believe the unmet hours refers to the entire building.  If the unmet hours for the different systems occur at the same time they are counted as one unmet hours regardless of the number of systems that indicate that the unmet hours have occurred at that time.
Robert O'Connell P.E.  CEM   CEA
M/E Engineering P.C.
Senior Engineer
HVAC Group
150 North Chestnut Street
Rochester, New York  14604
Office 585-288-5590 Ext. 347
Cell: 585-727-8517
Email: reoconnell at meengineering.com<mailto:reoconnell at meengineering.com>


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Brad Robinson
Sent: Thursday, July 07, 2011 11:16 AM
To: Patrick J. O'Leary, Jr.
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Unmet Hours

Hmmm..

Does that mean you need to sum the unmet hours of ALL separate systems as well?

In regards to the unmet cooling, LEED NC-2009 (Canada) notes that it is acceptable to have unmet cooling hours.  I interpreted this to mean that the unmet hours of concern are only on the heating side, not the cooling.

________________________________
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: Thursday, 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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