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RE: [EnergyPlus_Support] Zone mean air temperature
Sam:
That is puzzling. The hot water and chilled water loops should
function independently. The only place where they might interact
would be as each affects the space temperature.
I see now that you have the two boilers in series with both active.
That was the main source of the problem. When I put them in parallel
the max iteration warnings go away (all but one, which is acceptable,
probably during the warmup days). Sorry I didn't notice this
earlier. I will need to consult someone on the proper way to specify
boilers in series.
Mike
On 24 Oct 2003, at 23:59, Samuel Roose wrote:
> Everything is now running to the heating set point, thanks Mike. You
> were right to be suspicious of the boilers. When the boiler branch
> control type is changed from "active" to "passive", the boilers all of
> a sudden start working, and register readings. The trouble is, the
> chillers no longer register as much load as they did before the boiler
> change. These are currently set on active. I have tried iterations of
> passive and active control. Seems I can get either boilers and
> chillers working as they should, and either temperature or humidity
> working as it should, but not all 4 parts working at once. My research
> paper is due in five days so I am wrapping up my findings for now. I
> am sure eventually the model will sort itself out. Thank you very much
> for all your assistance.
>
> Sam Roose
> Victoria University of Wellington
>
> -----Original Message-----
> From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
> Sent: Fri 24/10/2003 7:02 a.m.
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Cc:
> Subject: RE: [EnergyPlus_Support] Zone mean air temperature
>
>
> Sam:
>
> Did some more with this. Main air loop had multiple supply and
> return fans in series and many max iteration errors. Tried changing
> this to a single supply and return fan, did not help. Noticed that
> the heating load range was being exceeded and increased the upper
> limit by a factor of 100 or so. This helped, but there are still
> many max iteration errors. Added reporting of the plant loop outlet
> temperature and boiler operation. The plant loop temperature is
> fluctuating widely and the boilers are never operating. That's all
> for today. I suspect there is a problem with the hot water loop
> and how it is connected or controlled.
>
> Mike
>
>
> On 8 Oct 2003, at 21:06, Samuel Roose wrote:
>
> > Mike,
> > I have just run the file for all 8760 hours of the year. What I am
> in > fact getting is temperature convergence to my heating set-point
> for > the first month of every simulation (the hourly temepratures
> were > obtained from one simulated month) then the temperatures all
> of a > sudden disregard the setpoints. It seems the heating system
> "runs out" > by February though I am not sure why. I have enclosed a
> graph in the > "Sam Roose" folder to demonstrate this problem. Thanks
> again, Sam > Roose Victoria University of Wellington > >
> -----Original Message----- > From: Michael J. Witte
> [mailto:mjwitte@xxxxxxxx] > Sent: Wed 8/10/2003 4:59 a.m. > To:
> EnergyPlus_Support@xxxxxxxxxxxxxxx > Cc: > Subject: Re:
> [EnergyPlus_Support] Zone mean air temperature > > > When I try the
> same thing the average of the hourly values matches > the monthly
> value. Do you perhaps have a schedule on the monthly > value which
> is suppressing certain hours of the day? If not, please > send your
> files so I can reproduce the problem. > > Mike > > > On 7 Oct
> 2003, at 18:22, Samuel Roose wrote: > > > I have just simualted a
> file asking for a) the average internal > > temperature in a zone
> per month and b) the hourly temperatures for > the > same zone and
> month (July). When the hour by hour readings are > > averaged, the
> average temperature result is very different (the > > average is
> 14.7 deg C for month by month and 19.3 deg C for hour by > > hour.
> The building I am simulating is controlled to between 21 and 22 > >
> deg C. This suggests to me that the calculation for average monthly >
> > temperature is incorrect, or that I am somehow misinterpreting my
> > > output. Any ideas? Thanks in advance, > > Sam Roose > Victoria
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