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RE: [EnergyPlus_Support] Latitude parameter in PV module
The optimal slope array should be close the local latitude. If you
change the latitude and keep the slope array value, the PV-production
should be lower, but remains the same (up to the last decimal position).
As far as I see, E+ isn't using the latitude value in the weather file
to convert the Horizontal Radiation to the total radiation on the tilted
surface of the pv-module.
We have made our own weather file derived from "ESP_Barcelona_IWEC.epw"
(near place to us) filling the Outdoor Temperature and Horizontal
Global Radiation with data from a local weather station. The PV
simulations forecasts optimal slope values around 30º while we expected
42º.
We need a clue, where can we look? Do we have to modify other values
like Extraterrestrial Radiation in the weather file?
Thanks in advance.
Miguel Angel
-----Mensaje original-----
De: Linda Lawrie [mailto:linda@xxxxxxxxxx]
Enviado el: viernes, 05 de septiembre de 2003 12:36
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Asunto: RE: [EnergyPlus_Support] Latitude parameter in PV module
At 05:13 AM 9/5/2003, Miguel Angel Pascual wrote:
>All these questions are derived of the fact that I am finding estrange
>optimum slope values for the weather in Barcelona. La latitude in
>Barcelona is around 42º and the maximum production is achieved with
>slope array values around 30º.
>
Well, it is true that the PV does have a sensitivity/parametric input to
Longitude but I'm not sure about Latitude. Latitude (in light of
having
the same solar on a weather file) will change some of the solar position
parameters and help determine when the sun is up or down.
What is it that you would expect to be seeing with just a change in
latitude?
Linda
EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team
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