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[EnergyPlus_Support] Re: Lots of Warnings
I have changed the preheat set preheat design set temperature to 18 C still the out put data is look nonsense in the heating season, csv attached.
Inlet temperature is very high 115 C
VAV Sys 1 outlet node always less or equal 18C
Could you help me sort out this problem.
Please, could you also elaborate what does you mean in this paragraph
'The SET POINT MANAGER:MIXED AIR pushes this setpoint to the heating coil exit
(less the fan heat delta), but the heating coil appears to be unable to meet
the load at some times'
Regards
Ali
"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
The SET POINT MANAGER:WARMEST object is setting the supply air temperature
setpoint. It has an upper limit of 18C. So, if no zones require cooling, it
will max out at 18C.
The SET POINT MANAGER:MIXED AIR pushes this setpoint to the heating coil exit
(less the fan heat delta), but the heating coil appears to be unable to meet
the load at some times. Try setting the "Preheat design set temperature" in
the SYSTEM SIZING object to 18C.
Mike
p.s. I'm gone tomorrow for a 4-day weekend. If you have questions tomorrow,
please send to the yahoo group or to energyplus-support@xxxxxxxx
On 30 Jun 2005, at 22:22, Ali_Ajmi wrote:
> Thanks Mike yes I was confused between the node names. Mike I checked the csv
> output file every things was reasonable in the cooling design day, however, is
> not in the heating mode; for example:
> VAV Sys outlet Node: System Node Temp[C] = 14.46 C
> VAV Sys outlet Node Setpoint Temp[C] = 18 C
> Mixed Air temp = 4.89 C
>
> Is the reason heating design setpoint temp. assigned to18 C?
>
> Attached with a CSV of the file you send me for your quick reference.
>
> Regards
> Ali
>
> "Michael J. Witte" wrote:
>
> My csv output file does not look like that. Are you sure you are not confusing
> several very similar node names. The only way that a given
> keyname+reportvariable combination can appear more than once in a csv file is if
> one is if the same thing is reported with and without schedule or at a different
> reporting frequency.
>
> Mike
>
>
> On 29 Jun 2005, at 17:24, Ali_Ajmi wrote:
>
> > Thanks Mike for sending me the file. Mike I have looked it and generate a run,
> > the out put seems reasonable, however, I have some inexplicable out puts data.
> > These are as follows: 1) Zone North in Node: System node Temp [C] has two
> > values in two different columns in the out puts; 15 C and 35 C. 2) Zone North
> > Node: System node setpoint Temp[C] has two values, -999 and 25 C.
> >
> > Please could advice me what may the reasons.
> >
> > Regards
> > Ali
> >
> > "Michael J. Witte" wrote:
> > I passed it along to another team member but I haven't heard back. My file
> > without return fan shows loads. See attached.
> >
> > Mike
> >
> >
> > On 23 Jun 2005, at 16:55, Ali_Ajmi wrote:
> >
> > > "Michael J. Witte" wrote:
> > > Not sure if there's a problem with the way the return fan is described or if
> > > it's a programming problem.
> > >
> > > Mike I deleted the return fan, every things went smooth. However, the
> > > sensible heating/cooling of the zones were Zeros. Have you checked if the
> > > progarm, E+, has problem with return fan?
> > >
> > > Thanks
> > > Ali
> > >
> > >
> > > Tried one more thing - deleted the return fan and the errors went away. Not
> > > sure if there's a problem with the way the return fan is described or if
> > > it's a programming problem.
> > >
> > > Mike
> > >
> > >
> > > ------- Forwarded message follows -------
> > > From: Michael J. Witte
> > > To: ajmi70kw@xxxxxxxxxxx
> > > Subject: Re: Lots of Warnings
> > > Date sent: Thu, 9 Jun 2005 16:43:47 -0500
> > >
> > > For some reason, the air loop components are fighting over whether there is
> > > flow in the system at certain times, which is causing some iterations to
> > > evalute the coil at a very low airflow rate which causes the errors. I will
> > > have to ask someone else to look at this to figure out if it's an input
> > > problem or not. Ultimately, I think the final results are OK, just some of
> > > the early iterations are confused.
> > >
> > > Mike
> > >
> > >
> > > On 7 Jun 2005, at 10:56, Ali_Ajmi wrote:
> > >
> > > > Dear Mike,
> > > > I am still struggling to sort out my IDF file
> > > > (VAVEnvlopBuild_fivZone1.idf). I have implemented your advices where I
> > > > changed the set point manger to Warmest, however, when I tried to use the
> > > > Coldest set point manger the file is crashed. Also I have changed the time
> > > > step in average window to be 1.4. Then I imitate the 5ZoneAutoDXVAV.idf in
> > > > the example files folder to be sure that both IDFs are almost similar.
> > > > However, still i have lots of warnings, about 20,000. Please could have a
> > > > look to the file (attached). Mike could you kindly treat this problem as
> > > > urgent because I am ruining out of time to implement my PhD research
> > > > experiments.
> > > >
> > > > File will be uploaded at the submitals_problem folder. I am using now
> > > > E+1.2.2. Regards Ali
> > > >
> > > >
> > > >
> > > >
> > > > ---------------------------------
> > > > Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with
> > > > voicemail
> > >
> > >
> > > ------- End of forwarded message -------
> > >
> > >
> > >
> > >
> > > ---------------------------------
> > > Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with
> > > voicemail
> >
> >
> >
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@xxxxxxxx
> >
> >
> >
> > ---------------------------------
> > Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with voicemail
>
>
>
>
>
>
>
>
> ---------------------------------
> Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with voicemail
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