One Unmet Load Hour Each Day at 3am??

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Dear Modeling Friends,

I'm usually good at dealing with Unmet load hours but this one has me stumped.

Issue:
The SS-R shows 365 unmet cooling hours for all spaces in the project. I set up an hourly report on one space to drill into the problem. The hourly output shows "Current Hour Zone Thermostat Setting" dropping down to 34F each day at 3am. When this occurs, the airflow ramps up to max cooling during that hour and cools the space down from 69 to 58F. Then at 4 am, the zone T-stat setting goes back to 69 (in heating) as it should. I've checked my temperature schedules three times and they appear correct. Does anyone have the answer!!:)

Kindly,

Greg Garcia
Engineer, PE
801.278.1927 x111
801.556.0564 (Mobile)
ggarcia at etcgrp.com
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If you forward the model pd2 and inp files to the group, you will get an answer fairly quickly.

Christopher Jones, P.Eng.
Tel: 416.644.4226 * Toll Free: 1.888.425.7255 x 527

Chris Jones

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Hello Chris,

Thank you for looking into this! Please see attached files.

Greg Garcia
Engineer, PE
801.278.1927 x111
801.556.0564 (Mobile)
ggarcia at etcgrp.com
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Greg,
I checked quite a number of things and I cannot figure out why this is happening. I adjusted a number of inputs but I could not get rid of the 3am "bug".

I may have time later this evening to have another look.

Christopher Jones, P.Eng.
Tel: 416.644.4226 * Toll Free: 1.888.425.7255 x 527

Chris Jones

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Ok,

Thank you kindly.

Greg Garcia
Engineer, PE
801.278.1927 x111
801.556.0564 (Mobile)
ggarcia at etcgrp.com
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