unmet hours with autosized hvac

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Hi All
I am working on existing building EEM model
I had existing HVAC unit of 20 ton for a space which showed 4000 hrs outside
throttle range.
when I autosize the unit, the size becomes 10 tons showing the building was
too oversized but still the model showed 2000 hrs outside throttle range.
I would believe if equest is sizing the equipment, we wont see any unmet
hours.

Am I understanding something wrong about the software?
Thanks

Regards
Deepika

DEEPIKA KHOWAL

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Bruce Easterbrook's picture
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Deepika:

Some may disagree with me. But I have had difficulties of under AND oversizing of equipment in eQuest and in DOE-2.1.? Realize if you are sizing for a single zone, you have the peak hours set up reasonably. But id you have multiple zones, your "Peak" equipment amy NOY cover the hotest and coldest zone adequately.

As carol has previously stated, you need to increase your supply fan CFM. I also never run less than 1 CFM/sf, otherwise, I have Hours of Load Not met.

Try increasing your CFM.

John Aulbach

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thanks all.
I will try doing this

DEEPIKA KHOWAL

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