[TRNSYS-users] Type194 Parameter Questions

[David BRADLEY via TRNSYS-users]

Ashley,

   I am not too surprised by the 100W output with 1000W incident; PV 
panels are not very efficient and depending on ambient conditions such 
as temperature and windspeed a 10% efficiency is not unreasonable. It is 
a little more troubling that increasing the array area does not have an 
impact on the output power. If you are using Trnsys17 then please send 
the project as well as any other files needed in order to run the 
project to your distributor's tech support hotline. If you're not sure 
who to contact then please send me an email containing the information 
in your user17.id file (it can be opened with a text editor) and I can 
put you in contact with the appropriate person. NOTE: please do not 
reply to the entire mailing list with the information above. Please send 
an email directly to me.


   As to your question about parameter 20; I_L is called the light 
current and is one of the five parameters used to describe the behavior 
of an equivalent circuit that is used to model PV behavior. Be very 
careful in modifying those parameters; they are all highly interlinked 
with one another and cannot realistically be changed independently of 
one another. For additional information on the variable and on the model 
I would recommend you look at the Type194 section of the 
04-MathematicalReference manual.

kind regards,

  David



On 07/20/2016 09:35, Easterling, Ashley J via TRNSYS-users wrote:
>
> I am modeling a solar array using Type 194. The weather file (Type 
> 109-TMY2) is supplying an appropriate amount of incident radiation 
> (~1000 W/m^2 in the summer in Richmond VA). However, when I connect to 
> Type 194, the solar panel outputs a maximum of ~100 W/m^2. I have 2 
> questions:
>
>
> 1) Increasing the array area is not increasing the output. Can anyone 
> explain why that might be?
>
> 2) What is parameter 20 (value of parameter I_L at reference 
> conditions)? Increasing it increases output.
>
>
> Any help would be appreciated.
>
>
> Ashley
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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