[Bldg-sim] EQUEST QUESTION

[Nick Caton]

A quick thought:   REHEAT-DELTA-T is a zonal input that has specifically caught me and others multiple times for systems with reheat.  It's something that isn't optional for some systems, and doesn't have a default coming out of the wizards so you have to physically enter something (I typically right-click and enter stuff like this as a user-defined default - blue text - more in the archives if you're interested).  If you leave the inputs blank the reheat won't engage.

If it's not that, efficiencies are relatively easy to check.  I would scan your reheat and preheat inputs (if applicable) next:   Right-click and review the DOES2 help entries under heat, reheat, and preheat (at the zones) for any inputs you've allowed to default/leave blank - you might just need to fill in one more box ;).

~Nick
[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of CleanTech Analytics
Sent: Wednesday, March 07, 2012 3:50 PM
To: Morgan Heater
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] EQUEST QUESTION

You might want to take the online eQuest course from  http://energy-models.com/training/equest/course-objectives
I found it to be very helpful when learning eQuest.

I would guess your issue is occupancy differences, or deep in the HVAC system like Morgan suggests..
On Wed, Mar 7, 2012 at 1:13 PM, Morgan Heater <morgan at ecotope.com<mailto:morgan at ecotope.com>> wrote:
I would take a look at your unmet load hours in the perimeter spaces.  If
they're high it's likely that you have a heating air flow rate or supply
air temperature issue.


Morgan Heater, P.E.
BEMP, LEED AP
morgan at ecotope.com<mailto:morgan at ecotope.com>
206-322-3753 ext 209<tel:206-322-3753%20ext%20209>

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>
[mailto:bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>] On Behalf Of RobertWichert
Sent: Wednesday, March 07, 2012 12:28 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] EQUEST QUESTION

I am trying to learn E-Quest and I am trying to model a building that I
have already modeled with Energy Pro.  The gas usage from E-Quest is
very very low compared to both actual and Energy Pro.  It is a hot water
reheat VAV system with a boiler and a water cooled condenser.  The
actual gas use is 17891 Therms, from the bills.  Energy Pro predicts
17600 Therms.  E-Quest predicts 580 Therms.  This makes no sense to me,
but it is clearly my error.  I have gone over the inputs several times.

Is there anything that occurs to anybody that would make gas usage that
far off?

Electrical from E-Quest is 453 MWh.  Electrical from Energy Pro is 422
MWh.  Electrical actual is 543 MWh.  The building has lots of
unaccounted-for process equipment, so I'm not so worried about being low
on electrical.  It's not too far off.  But the gas use is just way too
low.  Hot water is showing up at 3 Therms a month.


This is the first model I have done with E-Quest, so I apologize for
even asking.  It's obviously something stupid that I have done.


--
Robert Wichert P.Eng. LEED AP
+1 916 966 9060<tel:%2B1%20916%20966%209060>
FAX +1 916 966 9068<tel:%2B1%20916%20966%209068>







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