[Bldg-sim] Problems with Design Days

[Matt Edwards]

Hello all,

Has anyone had trouble with erroneous "HOURS ANY ZONE ABOVE COOLING THROTTLING RANGE" when using cooling design days?  This number reported in both the BEPS and BEPU reports does not offer any insight on where it comes from, so it's especially difficult to troubleshoot.

I'm noticing several different simulation runs where the "PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE" is at either 0 or 0.01% while there are thousands of "HOURS ANY ZONE ABOVE COOLING THROTTLING RANGE."  I thought when this field was added that it was supposed to report unmet hours, but I can't see why the numbers don't agree.

It appears that eQUEST has a hard time distributing airflow to zones correctly unless enough days are included in the "design day" dialogue box, but when you enter too many, the phenomenon above tends to occur.

Can anyone shed light on where the "HOURS ANY ZONE ABOVE COOLING THROTTLING RANGE" and "HOURS ANY ZONE BELOW HEATING THROTTLING RANGE" come from since LEED reviewers are now looking at this and only this to determine unmet hour compliance?

Thanks,

Matt Edwards, P.E., LEED AP BD+C
mechanical engineer

M-E Engineers, Inc.<http://www.me-engineers.com/>
10055 west 43rd avenue
wheat ridge, co 80033

office:  303.421.6655
direct:  720.898.3164
matt.edwards at me-engineers.com<mailto:matt.edwards at me-engineers.com>

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