Re: Non-Standard type101 (type52) matched flow collector: error

["Peter Vogelsanger" <peter.vogelsanger@xxxxxxxxxxxxxx>]

TRNSYS specialists

This is a question regarding the matched flow collector model, type 101 (formerly
type 52) (non-standard), written by Per O. Isakson, distributed by TRANSSOLAR and
maybe others. The error 'LE2_log ower flow' stops the simulation (rarely, but if it
does this is a mayor problem for our testing of solar systems). More details about
the problem encountered are given below. 

Questions:
Is there anyone (the author, transsolar, ?) who masters and maintains the code? 
If not, is there a more detailed description of the code, such as a description of
the variables used? (I do not mean the parameter-list, input/output-configuration
and physics involved: I do have that description).
Has anyone come across the same problem and identified a cause or even solved it?

Problem: 
I believe to have been facing problems with 'LE2_log ower flow' before when there
was a small flow rate, which was for some reason not discovered as such and
eliminated by the routine. Recently the error occurred in a no-flow situation. (No
flow in the timestep when the error occurred and no flow in at least 10 preceding
timesteps either). Looking at the code reveals that only one simple condition in
subroutine Search_LE2_log can cause the error. However, printing out the quantities
used by this routine generates more question than answers.  

Note:
I have been working with that type for years and the longer I use it, the more I
like it. It would be a petty if I'd have to give it up for a minor reason. But that
code is not exactly like reading Harry Potter. 


Peter
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