[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TRNSYS-users] ...small time step problem [2]

Piya,
I would be very careful in using the radiation smoothing feature on Type16 and would highly recomment plotting the radiation outputs from Type16 in an online plot to make sure that they look reasonable. The radiation smoothing algorithm works quite well on certain weather data files and really makes a mess of others. We (the developers) were never able to tell why it worked so poorly in some circumstances or how to tell whether it was going to be a problem for a given weather file except by plotting the results. The smoothing algorithm was removed from TRNSYS 16 because of its questionable results. You might be best advised to simply switch off the smoothing in your Type16. 
Cheers,
 David

Piya Louis Siangsukone wrote:


I did some further investigation on this problems and I found out that
the problem occurred when the type 16 with smoothing option is used.
(type 16h)

The error is "Range Check Error" and happened when the subroutine CURVE
is called in the type 16. Thus I suspect that some array size might be
set too small for my time step (0.1 minute time interval) to calculating
the radiation data. CURVE subroutine is only called when the smoothing
option is choose and it calculates the radiation level based on fitting
the data with the polynomial equation. And I think if the size of some (problem parameters) can be changed this 
problem can be solved.

Are there any suggestions for that?

Cheers,

Piya Louis Siangsukone
Ph.D. Candidate
Centre for Sustainable Energy Systems
Department of Engineer & IT
CANBERRA ACT 0200 AUSTRALIA


-----Original Message-----
From: trnsys-users-bounces@engr.wisc.edu
[mailto:trnsys-users-bounces@engr.wisc.edu] On Behalf Of Piya
Siangsukone
Sent: Saturday, 23 July 2005 12:15 PM
To: trnsys-users@engr.wisc.edu
Subject: [TRNSYS-users] small time step problem

Dear TRNSYS user,


I have a problem when I run TRNSYS with type 16 radiation processor
component using a very small time step (0.1 minute).
Without type 16 I can run TRNSYS (based on 0.1 minute time interval)
with
no problem.
I knew that TRNSYS 16 does not have this problem anymore.
But unfortunately I am still in version 15 and my work requires a very
small time step (0.1-0.5 minutes).

Are there any hints?

Cheers,
Louis


Piya Louis Siangsukone
Ph.D. Candidate
Centre for Sustainable Energy Systems
Faculty of Engineering & IT, The ANU
Canberra, Australia

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.525 / Virus Database: 322 - Release Date: 9/10/2003


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.525 / Virus Database: 322 - Release Date: 9/10/2003


_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users


--
David BRADLEY
TRNSYS Engineer
Solar Energy Laboratory - University of Wisconsin, Madison
1500 Engineering Drive
Madison, WI 53706 United States 

ph: +1 608 263 1589
fax: +1 608 262 8464
email: dbradley@engr.wisc.edu