[Equest-users] HHW reset controls in eQuest
Dominique Michaud
dominique at scengineers.net
Tue Sep 17 09:51:22 PDT 2013
Fellow eQuest modelers,
I'm reposting my last query (see below) with an example of one of the eQuest
models that I have been having trouble with. Again, I'm having trouble
modeling some very simple (IMO) heating hot water/boiler energy efficiency
measures. I'm just not seeing the amount of savings I'm expecting. I'm even
seeing negative savings for some measures (this is especially frustrating).
My offer of a beer to anyone who helps me solve my problem still stands,
though I'll have to restrict my offer to US/Canada destinations. Did I
mention I'm in San Diego
<http://travel.nytimes.com/2012/05/27/travel/san-diegos-thriving-craft-beer-
scene.html?pagewanted=all&_r=0> ?
Thanks in advance for your help.
Dominique Michaud | Project Engineer
<http://www.scengineers.net/> SC Engineers, Inc.
<http://maps.google.com/maps?hl=en&cp=40&gs_id=2&xhr=t&q=17075+Via+Del+Campo
,+San+Diego,+CA+92127&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=583
&wrapid=tljp132371020953200&um=1&ie=UTF-8&hq=&hnear=0x80dbf72707811bcf:0xafd
a74b7e473e651,17075+Via+Del+C> 17075 Via Del Campo, San Diego, CA 92127
P: 858.946.0333 | C: 858.436.4213 |F: 858.946.0334
<mailto:dominique at scengineers.net> dominique at scengineers.net |
<http://www.scengineers.net/> www.scengineers.net
From: Dominique Michaud [mailto:dominique at scengineers.net]
Sent: Friday, September 13, 2013 5:35 PM
To: 'equest-users at lists.onebuilding.org'
Subject: HHW reset controls in eQuest
Fellow eQuest modelers,
I am experiencing a great deal of grief trying to model HHW/boiler energy
efficiency measures using eQuest. I am trying to model HHW temperature
resets based on outside air temperature and boiler lockout strategies.
Under the DD Wizard, "Hot Water System Control and Schedule > Setpoint is:"
drop-down list I've selected "OA Reset" and allowed the resulting hi/low
temperature values to default, namely HW Max Temp: 180.0F and HW Min Temp:
140.0F (see attached screenshot).
Digging into the BDL, I noticed this issue:
*5356 * "B5HW Lp Heat Reset Sch-D" = DAY-SCHEDULE-PD
*5357 * TYPE = RESET-TEMP
*5358 * SUPPLY-LO = 140
-CAUTION-------------------------- ===
-------------------------------------------------------
-CAUTION--- VALUE GREATER THAN MAXIMUM OF 0.1200E+03
*5359 * SUPPLY-HI = 180
-CAUTION-------------------------- ===
-------------------------------------------------------
-CAUTION--- VALUE GREATER THAN MAXIMUM OF 0.1200E+03
*5360 * OUTSIDE-LO = 30
*5361 * OUTSIDE-HI = 65
*5362 * ..
However, it looks as though the values are accepted for the reset schedule:
-NOTE- - - DATA FOR B5HW Lp Heat Reset Sch-D
-INPUT - - - - - - - - - - - - - - - - - - - - - - - - TYPE =
RESET-TEMP
-INPUT - - OUTSIDE-HI =
65.0000 F
-INPUT - - OUTSIDE-LO =
30.0000 F
-INPUT - - SUPPLY-HI =
180.0000 F
-INPUT - - SUPPLY-LO =
140.0000 F
-DEFAULT - - - - - - - - - - - - - - - - - - - - - - - DAY-HOURS =
1.0000
-DEFAULT - DAY-HOURS =
24.0000
When I run the model I end up negative natural gas savings (i.e. more gas
usage than in my baseline case). No matter what dials I try to turn with
this EE measure, I consistently end up with negative savings. Even more
frustrating, when I try to run a OA temperature lockout for the boiler, I
get even more energy use than my baseline model!
Can anyone provide me with some guidance on what I need to do to get my
model to run these EEMs correctly? Help put me on the path to solving these
problems and I will buy you a beer.
(Note: I am using eQuest 3.64 Build 7130 - the latest release)
Thank you for any assistance you can provide.
Yours,
Dominique Michaud | Project Engineer
<http://www.scengineers.net/> SC Engineers, Inc.
<http://maps.google.com/maps?hl=en&cp=40&gs_id=2&xhr=t&q=17075+Via+Del+Campo
,+San+Diego,+CA+92127&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=583
&wrapid=tljp132371020953200&um=1&ie=UTF-8&hq=&hnear=0x80dbf72707811bcf:0xafd
a74b7e473e651,17075+Via+Del+C> 17075 Via Del Campo, San Diego, CA 92127
P: 858.946.0333 | C: 858.436.4213 |F: 858.946.0334
<mailto:dominique at scengineers.net> dominique at scengineers.net |
<http://www.scengineers.net/> www.scengineers.net
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