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
