parameter simulation-ambient temperature in PV

[JP]

I am trying to do a parameter simulation in order to see how it
affects ambient temperature in a PV system.
I know its possible to choose that parameter in a "component based"
model.
I think i found this parameter (temperature behind panels) in the
"Sandia PV array model" or in the "CEC performance model" but the file
crashed and i cant find it out.

any suggestion?
thanks a lot

[solar.advi...@nrel.gov]

Dear JP,

Could you describe more what you are trying to do, and the specific
steps that led to the crash?

Each module model in SAM uses a different approach to representing the
effect of temperature on module efficiency that involves calculating
the module cell temperature from the ambient temperature, wind speed,
and module properties. The module temperature coefficients used in the
Sandia and CEC models are stored in the parameter library, so you
cannot change them from the module page. In the simple efficiency
model, the temperature coefficient of power is an input, so you can
perform a parametric analysis on the value to see what its effect is
on the system's performance.

Best regards,
Paul.

[JP]

Dear Paul, thanks a lot for your help.

Regarding to the crash, I must say that I made a new file and I am not
having that issue.

Regarding to the simulation with Temperature as parameter, I will try
with this coef. from the simple eff. mode.

Anyway the idea was to check how the ambient temperature affects the
whole performance. So maybe a possibility could be to change the
values of Amb.temp. in the weather file? ( this seems to be
laborious )

What I tried also is doing a parameter simulation with the "CEC
Performance modules", varying "Temperature behind the panels" but
doesnot seem to affect.

Best Regards
JP

[Paul Gilman]

Hi JP,

One way to investigate the effect of temperature on the PV models
would be to compare the hourly output on two days with similar
radiation profiles but different temperatures, for example, a sunny
day in the summer and another in the winter for a location with hot
summers and cold winters. Or you could compare days with similar
radiation profiles in two different locations. For example, Casper,
Wyoming in the US has clear winter days with relatively low
temperatures, and Phoenix, Arizona has clear summer days with
relatively high temperatures.

That might give you more insight into how SAM models temperature
effects than trying to modify module parameters.

You could model identical systems in two locations, and use DView to
create 24-hour time series graphs showing hourly plane of array
irradiance, system AC output along with ambient and cell temperatures
for winter and summer days.

Best regards,
Paul.