[TRNSYS-users] Strange results when using more than one component with storage

[David Bradley]

Chun-Kwong,
  Having messed up the use of storage in many many components myself, I 
can very confidently tell you that the problem lies either in the 
implementation of the getStorageValues(), and setStorageValues() 
subroutines in your Type or in the reading of parameters when the Type's 
UNIT number has changed.

 If you want a quick and dirty solution, you can make two types, both of 
which are identical but which have different numbers. That way, 
technically, you only have one unit of each of two components instead of 
two units of the same component...

If you want to solve the problem, however, the first thing to make sure 
of is that your Type is rereading its parameters either every single 
iteration (which is a bit inefficient but simple) or that the Type is 
checking to see if INFO(1) has changed since the last time that the Type 
was called. All of the standard Types make this check. You'll find 
something that says "IF (IUNIT.NE.INFO(1)) THEN ... reread parameters). 
If that doesn't solve the problem, then the issue lies in the use of 
getStorageVars() and setStorageVars(). What may be happening is that 
some local variable in your component is not getting recalculated 
properly when the simulation time and iteration count have not changed 
but the unit number has. There are lots of other things that could be 
wrong of course... I would recommend putting breakpoints into your code 
and walking though the simulation one iteration at a time to try and 
figure out where the problem is coming from.
Kind regards,
 david


a8304506 at graduate.hku.hk wrote:
> Hello, Trnsys users.
>
> I have written a new component which uses storage.  When I test it in a project
> containing only one unit of the new component, it looks alright.  However, when
> I implement it into a project with two units of the same new component, strange
> results are found.  Should I need to add specific statements in the source
> code?  Please advise how I can rectify the problem.  Thank you!
>
> Best Regards
> LEE, Chun Kwong
> Research assistant
> Division of Building Science and Technology
> City University of Hong Kong
>
>
>
>
>   
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