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RE: [EnergyPlus_Support] Zone mean air temperature

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Zone mean air temperature
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Thu, 23 Oct 2003 13:02:36 -0500
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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      
>  EnergyPlus-Support@xxxxxxxx
> 
> 
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References:
- RE: [EnergyPlus_Support] Zone mean air temperature
  - From: Samuel Roose

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