Re: [TRNSYS-users] wood and gas burner (type 170) in the sameproject?

["hotline" <hotline@transsolar.com>]

Dear Ralf,

As Diego mentioned TYPE 170 is programmed such that it could be used only once during
the simulatuion. For using it more often the code must improved using the so called 
s-array for storing values.

Best regards,

Marion Hiller
TRNSYS hotline team

-----Ursprüngliche Nachricht-----
Von: trnsys-users-bounces@engr.wisc.edu [mailto:trnsys-users-bounces@engr.wisc.edu] Im Auftrag von Diego A. Arias
Gesendet: Dienstag, 5. September 2006 15:40
An: Gorissen, R.
Cc: trnsys-users@engr.wisc.edu
Betreff: Re: [TRNSYS-users] wood and gas burner (type 170) in the sameproject?


Dear Raf,

I think that the problem is that the source code is not re-reading the 
parameters for the different instances of this component during each 
simulation call. I think that you will find a code line like this:

IF(INFO(7).NE.-1) GO TO 3

This means that if this is not the initial call, jump to the line with 
label '3'.
You will have to make sure that this label is located before the 
parameters are read, for example:
3 dummy = PAR(1)

If you still have problems with this component, please feel free to send 
me the sourcecode and a simplified version of your simulation where I 
can see the problem.
Best regards,

Diego


Gorissen, R. wrote:
>
> Dear trnsys users,
>
> I'm having a little bit of trouble with the non standard type 170 (or
> the update version of it, type 370) to model a wood/gas boiler (in 
> trnsys 15 build 3.0.0.26)
>
> My heating system simulation use 2 large boilers, one running on gas
> and the other on wood. So I included 2 type 170's in my project, one 
> to simulate the large gas fired burner (mode 2) and one smaller wood 
> fired unit (mode 4). But looking at the output of these two burners it 
> shows that when ever a gas fired burner is present in the project, the 
> internal calculation of the consumption of wood (OUT(16): Mpkt_Br in 
> [kg/h]) in the wood burner unit uses the calorific value for gas (35 
> MJ/m3) instead of the calorific value of wood (about 18.5 MJ/kg). Thus 
> resulting in wood consumption which is to low. When I set both burners 
> to wood (PAR(2),BSTRO = 4) the internal calculation of the needed wood 
> [kg/h] seems correct (comparing it to OUT(6),Phumax).
>
> Is there a workaround for this problem (setting a different logical
> unit for both burners, although there is no parameter for this in type 
> 170)?
>
> Best Regards,
>
> Raf
>
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-- 

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706 _______________________________________________
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