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RE: [EnergyPlus_Support] Zone mean air temperature
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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> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
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