RE: [EnergyPlus_Support] About the output:variable

Hello,

Results of csv file and results of E+ variables didn’t match yet even though the csv data is reported at "Detailed" frequency.

Ying Yan

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_Support@xxxxxxxxxxxxxxx] on behalf of Griffith, Brent [brent.griffith@xxxxxxxx]
Sent: Wednesday, July 18, 2012 5:09 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] About the output:variable

For starters, the csv data need to be reported at “Detailed” frequency.

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Yan, Ying
Sent: Wednesday, July 18, 2012 2:59 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] About the output:variable

Hello,

I did some experiments and got some results in the attached document. I found that the data in the csv didn't match E+ variables. Thank you.

Ying Yan

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_ Support@xxxxxxxxxxxxxxx] on behalf of Richard Raustad [RRaustad@xxxxxxxxxxxx]
Sent: Wednesday, July 18, 2012 3:56 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] About the output:variable

Just put a break point in the update routine and see if the variable matches the output csv detailed reporting at the end of the time step. I showed you how to tell which number was from the last time step in a previous email (watch the time variables in the watch window).

On 7/18/2012 3:45 PM, Yan, Ying wrote:

Hello,

I knew each time step is simulated multiple times, but I don't know why it iterates many times. Can you tell me the termination criterion of iteration of "CoolingCoil" subroutine? Since "SimulateWaterCoilComponents" call "UpdateWaterCoil", in my opinion, variables of cooling coil are updated which means the iteration of "CoolingCoil" is termination. However, following your suggestion, I found that the iteration of "CoolingCoil" isn't termination even though it calls "UpdateWaterCoil" and "ReportWaterCoil". Can you explain it for me, thank you very much!
Ying Yan
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_Support@xxxxxxxxxxxxxxx] on behalf of Yan, Ying [yiy11005@xxxxxxxxxxxxxx]
Sent: Tuesday, July 17, 2012 10:55 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] About the output:variable
Hello,

Thank you very much for your suggestions! I will try it.
Ying Yan
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_Support@xxxxxxxxxxxxxxx] on behalf of Richard Raustad [RRaustad@xxxxxxxxxxxx]
Sent: Tuesday, July 17, 2012 10:47 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] About the output:variable
I have time variables in my watch window. When these change, the simulation has moved on to the next time step. This means the last value I saw (not this one) should match the csv d ata.

These are my watch variables:
DataEnvironment::Month
DataEnvironment::DayofMonth
DataGlobals::CurrentTime
DataHVACGlobals::TimeStepSys (this will match TimeStepZone unless the simulation reduces the time step)
DataHVACGlobals::SysTimeElapsed (this variable counts the "reduced" time step increments)
DataGlobals::TimeStepZone (this is set in your input file - e.g., Timestep,6;)

When any of these change, the simulation moved to the next time step (i.e., the variable value before should match csv).

On 7/17/2012 10:31 AM, Yan, Ying wrote:

Hello,

Thank you very much for y our reply. I knew that these models need to iterate many times to get the answer. However, I don't know which update is the last update to the variables. Can you tell me how to determine which update is the last update to the variables for one step? Thank you very much!

Regards,

Ying Yan

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_Support@xxxxxxxxxxxxxxx] on behalf of Richard Raustad [RRaustad@xxxxxxxxxxxx]
Sent: Tuesday, July 17, 2012 10:03 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] About the output:variable

Each time step is simulated multiple times, on the last iteration the
data in the csv should match E+ variables.
The DX coil, as well as other system types, also iterates many times.
You need to watch for the the last update to the variables in order to
match to the csv file.
I have done this many times and I find that the answers match.

On 7/17/2012 9:47 AM, yingyan2012 wrote:
> Dear Sir or Madam,
>
> I ran the source code and then use "ReadVarsESO.exe" to get the output file. Obviously, this file containing output variables are as same as the file obtained from E+. However, I ran the source code step by step to output some variables of cooling coil such as outlet temperature, outlet humidity ratio and so on and compared these results with results contained in the output file (I chose "detailed" as reporting frequency). I found that quantities of variables obtained from running of source code step by step are different from quantities of variables contained in output file. I am very confused. Can you explain this situation for me, thank you very much.
>
> Regards,
>
> Ying Yan
> ECE
> UConn
>
>
>
> ------------------------------------
>
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>
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>
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--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years
-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
 
UCF - From Promise to Prominence: Celebrating 40 Years

--

Richard A. Raustad

Senior Research Engineer

Florida Solar Energy Center

University of Central Florida

1679 Clearlake Road

Cocoa, FL  32922-5703

Phone:   (321) 638-1454

Fax:     (321) 638-1439 or 1010

Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years

__._,_.___

Primary EnergyPlus support is found at: http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx The primary EnergyPlus web site is found at: http://www.energyplus.gov The group web site is: http://groups.yahoo.com/group/EnergyPlus_Support/ Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files. EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

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