Has anyone ran any of their old files in the new equest yet. My numbers have significantly changed. I am working on ECMs and my constant volume alternative is saving more money than my vav alternative. Is anyone else having any problems with this. Should I not be running 3.61 file on 3.63?
Charles (Jason) Land
I am having a similar problem after making the switch from 3.62c to
3.63. My cooling energy almost doubled from one version to the next and
my heating energy was cut almost in half.
Jason,
There is a bug in V3.63 that defaults zone heating minimum flow ratio to
1.00 (technically, I think it defaults to the system minimum overall
supply ratio), rather than the system heating minimum flow ratio (which
defaults to 0.01). This will cause systems with variable heating air flow
to use a lot more fan and heating energy than expected.
You can either change all of your zone flows manually or set a
user-defined default code snippet: for the zone heating minimum air flow
(or insert this bit of code in your .inp file).
if (#P("HMIN-CFM-RATIO") == unused)
then unused
else if (#RV(#P("HMIN-CFM-RATIO")) == 0)
then #P("HMIN-CFM-RATIO")
else no_default
endif
endif
Hope this helps,
Clayton
Charles Land
Sent by: equest-users-bounces at lists.onebuilding.org
05/21/2009 11:08 AM
To cc
"equest-users at lists.onebuilding.org"
Subject
[Equest-users] new equest
Has anyone ran any of their old files in the new equest yet. My numbers
have significantly changed. I am working on ECMs and my constant volume
alternative is saving more money than my vav alternative. Is anyone else
having any problems with this. Should I not be running 3.61 file on 3.63?
Charles (Jason) Land
Charles,
We may have introduced a bug into 3.63 that is causing the problem. It's
possible that we have already identified the problem and have fixed it for a
pending release.
Please send me your .inp and .pd2 files, as well as the .sim files for 3.61
and 3.63 runs so that I can study your problem (Charles only at this time).
Steve Gates
Charles,
Clayton has identified the bug I'm talking about, and his expression,
specified for ZONE:HMIN-FLOW-RATIO is the fix we have implemented in the
pending release.
Steve Gates
Where in the input file should this be placed?
Does it only apply to VAV systems with THERMOSTAT-TYPE not
REVERSE-ACTION?
Thanks,
Doug Maddox