[Equest-users] ASHRAE 90.1 Appendix G Proposed Model

[Bishop, Bill]

Pete,

Before increasing the proposed design heating capacity, I would consider other changes you can make to the model:

*         Increase the process/plug loads (after all, it is a manufacturing facility)

*         Decrease the heating thermostat setpoint (70F or less)

*         If you have nighttime setback, create a morning warm-up period

*         Increase the thermostat throttling range a few degrees (reflecting less "comfort" but resulting in fewer unmet hours; IMO a last resort before adding heating capacity)
Note that you would make the same changes in the baseline for any/all of these suggestions.

Regards,
Bill

[Senior Energy Engineer 28Jun2012]<mailto:wbishop at pathfinder-ea.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Baumstark
Sent: Friday, October 05, 2012 10:54 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] ASHRAE 90.1 Appendix G Proposed Model

I have a high bay manufacturing facility with two100% OSA, CV, low cfm but high air velocity heating only units.  These are intended for comfort heating.

The building also has one 100% OSA, CV make-up air (MUA) unit, with a gas furnace.  The MUA is only used when one or more roll-up doors are open with trucks inside and unloading.  This blows the diesel fumes out of the building.  The MUA has almost 3x the air volume capacity as the two comfort heating units combined.

When I model the proposed design, with just the two units intended for comfort heating, I end up with almost 700 unmet heating hours.  I add the capacity for the MUA unit and schedule it for the purpose of comfort heating, and my unmet hours go down to less than 10.

Also in 90.1, App G, if unmet load hours exceed 300, heating capacity can be added incrementally until unmet load hours are reduced to below 300.

So would it be fair to not include the MUA unit for heating, but simply add one or two more of the comfort heating units to get the unmet hours down?  It seems like it may be over-kill to include the MUA unit for the purpose of comfort heating.

Any guidance would be appreciated.

Thank you,
Pete
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