[TRNSYS-users] more problems with type 109 user format!

[Timothy McDowell]

Eleni -

> "*** Warning at time       :         0.000000
>     Generated by Unit     :     3
>     Generated by Type     :    25
>     Message               : The printer has rounded the reset time to an
even number
> of timesteps -
> Please check to make sure that this does not adversely affect your
simulation results."
> I dont understand what that means.

This warning is caused by rounding when you set your timestep at 5 minutes
in Studio.  If you set your timestep to 5/60 hours in an equation the
warning goes away.

I also took a look at your data file and you are missing an hours worth of
temperature and relative humidity data around line 26500 in the data file.

We do not often use type 109, but I was able to succesfully read your data
file (with the missing data replaced) using a type 9 data reader and
processed the radiation data using type 16 radiation processor and matched
your input weather data.

Regards,

Tim McDowell
----------------------------------
Timothy McDowell
Executive Vice President
Thermal Energy System Specialists, LLC
2916 Marketplace Dr, Suite 104
Madison, WI 53719
Phone: 608-274-2577
Fax: 608-278-1475

>----- Original Message -----
Subject: [TRNSYS-users] more problems with type 109 user format!
Date: Thu, March 6, 2008 10:26
From: "Eleni Ampatzi" <ampatzie at Cardiff.ac.uk>
Dear All,
>
> After Knut's suggestion I corrected the type *.109 file by deleting any
radiation
> values between
> sunset and sunrise. To do that I used the standard format TM2 weather
data for
> Cardiff and I read it
> with type 109 (mode 2). I got as outputs the I_Glob_H and the I_diff_H
which I then
> compared in a
> spreadsheet with the measurements I have (I used an IF function in Excel
to turn to
> zero the values
> of my measurements when at the same time those from the Output of TM2
were 0). I
> then used the same
> longitude and latitude in my *.109 file as those in the TM2 file and run
the
> simulation. I would
> expect to have no warnings anymore, but this was not the case. I still
get more than
> 500 warnings.
> In addition I have two other problems:
>
> 1) If I use as STOP time for my simulation = 8760 hours then I get an
error message
> and the
> simulation does not run (please see attached jpeg). If I use 8759 for
STOP time, the
> simulation runs
> and I get a warning saying that
>
> "*** Warning at time       :         0.000000
>     Generated by Unit     :     3
>     Generated by Type     :    25
>     Message               : The printer has rounded the reset time to an
even number
> of timesteps -
> Please check to make sure that this does not adversely affect your
simulation results."
> I dont understand what that means.
>
> 2) In my *.109 file, if I use as "Time corresponding to first data line
(hours)"= 0
> my simulation
> will not run as I get a "Range Check error". Again I do not understand
why this
> happens.
>
> 3) If I get as outputs from my weather data (the one with the
measurements) the
> I_Glob_H and the
> I_diff_H I see that this were not just read by type 109, they are
altered. This is
> obviously related
> to the warnings I get. ?!
>
> I would appreciate any help with this, as I am doing (as part of y
research) a
> sensitivity analysis
> regarding the weather data and I need to use both average and actual
year data. As I
> have all those
> problems my analysis is totally unreliable for now. Please help me,
>
> Best regards
>
> Eleni Ampatzi
> Welsh School of Architecture
> Cardiff University
>
>
>
>
>
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