[TRNSYS-users] Problem with radiative Heater (in Heating Type Manager of PREBID)

[Jong, M.J.M.]

Hi Florain,

I had a similar problem. I found a trick to avoid the problem. You can use
an input for the radiative part of the heating power (you have to define
this in Prebid).

For example: the name of the input is RADFRAC and the fraction you wish is
0.5.

In your *.dck file you have to add the following statement:

RADFRAC=0.5*GT(TIME,1)
This statement means that if time >1 hour the radiative part will be 0.5. If
you add RADFRAC to the inputs of type 56, you can run your model.

I also asked questions about this to the TRNSYS hotline. It has something to
do with the Trnlib.dll file that you use. You have to compile the Trnlib.dll
file in release mode. I attached my questions and the answers about this
topic to this mail and maybe this will help you as well.

Regards,

Maurice Jong
ECN-DEGO
The Netherlands. 


-----Original Message-----
From: Florian Keppler [mailto:flo_usa at gmx.de]
Sent: 13 October 2004 00:31
To: trnsys-users at engr.wisc.edu
Subject: [TRNSYS-users] Problem with radiative Heater (in Heating Type
Manager of PREBID)


Dear Trnsys-User,
hello Solar Energy Lab,
 
this is Florian from the University of Stuttgart. Right now I'm working at
my diploma thesis using TRNSYS and a problem occured we were not able to
solve. I hope that you might have a solution or an idea how to fix it.
 
In PREBID I'm using the Heating Type Manager (Ideal Heater) with limited
power to heat a room to a certain temperature (20°C). So far I was only
using convective heat, means the radiative part of the heating power was
equal to zero. In this case everything was fine and i didn't have any
problems running the simulation. However, when i changed the radiative part
of the heating power to any value (0.000001 to 0.99), the simulation stops
at the very first timestep showing an error message that the pane
temperature of the zone window is out of bounds. This happens with any
radiative part of the heating power (except 0), no matter how big the
heating power or the radiative part actually is. 
 
We varied many parameters (heating power, radiative part, window type)
always getting the same error message. It would be great if you had an idea
how to fix that or if you could identify the problem. Thank you very much in
advance!!
 
I attached the files I used in case you have time to have a look at them
(PREBID files, DCK file, LIB file...).
 
Thanks again and kind regards,
 
Florian (Keppler) 

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