[Equest-users] Unmet Heating Hours - ES

[Kelsey VanTassel]

Make sure that your thermostat type is appropriate. Use Reverse Action if you want to allow the supply flow in heating mode to rise above the minimum flow ratio, otherwise use Proportional. Also try reducing the cool control range from 4 deg to 1 deg.

Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>
608.836.4488 ext. 20 | Fax: 608.836.4477

Sustainable Engineering Group
901 Deming Way, Suite 201
Madison, WI 53717
www.sustaineng.com<http://www.sustaineng.com/>


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Chris Swanson
Sent: Wednesday, October 20, 2010 1:16 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Unmet Heating Hours - ES

All,

I am modeling a two-story elementary school with a VRV / DOAS system in one area (classrooms, admin.), and a VAV system in another (gym, cafeteria, food prep.).  The unmet heating hours are currently around 750, and I am at my wit's end to reduce them further.  I have incorporated suggestions such as increasing the throttling range (currently at 6, helped a little bit) and sizing ratio (currently at 1.15, although increasing to 2.00 did not help much).  As I have also tried my best to model the VRV / DOAS system, I'm still not sure if it is correct...  I've just picked up what I could from the users archives.

Does anyone have suggestions for reducing the unmet heating hours that I may not be aware of?  I have attached the .inp file.  Can anyone see glaring mistakes in the model?

Thanks,

Chris Swanson
Mechanical Designer
Roger D. Fields & Associates
Columbus, Ohio 43220-2777
E-mail: cswanson at rdfa.com<mailto:cswanson at rdfa.com>

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