[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [EnergyPlus_Support] Latitude parameter in PV module
The conventional wisdom of the best PV angle equal to latitude does not
always hold. I don't know the weather in Barcelona but depending on the mix
of cloud cover throughout the year, it can make sense to have an optimum PV
angle that differ from latitude. Annual hourly simulations can be
surprising!
-----Original Message-----
From: Miguel Angel Pascual [mailto:mapascual@xxxxxxxxxxxx]
Sent: Friday, September 05, 2003 5:30 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: 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 <http://www.energyplus.gov>
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
< http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/S=1705
<http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/S=1705>
007389:HM/A=1693353/R=0/SIG=11t71ok4g/* http://www.netflix.com/Default?mq
<http://www.netflix.com/Default?mq>
so=60178294&partid=3170658> click here
< http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=egrou
<http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=egrou>
pmail/S=:HM/A=1693353/rand=423593417>
To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov <http://www.energyplus.gov>
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
<http://groups.yahoo.com/group/EnergyPlus_Support/>
Attachments are not allowed -- please post any files to the appropriate
folder in the Files are of the Support Web Site.
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
< http://docs.yahoo.com/info/terms/ <http://docs.yahoo.com/info/terms/> > .
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
<http://rd.yahoo.com/M=243273.3844966.5093337.1261774/D=egroupweb/S=17050073
89:HM/A=1750744/R=0/SIG=129rafgf3/*http://servedby.advertising.com/click/sit
e=552006/bnum=1062761469811016> Click to learn more...
<http://us.adserver.yahoo.com/l?M=243273.3844966.5093337.1261774/D=egroupmai
l/S=:HM/A=1750744/rand=716109095>
To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov <http://www.energyplus.gov>
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
<http://groups.yahoo.com/group/EnergyPlus_Support/>
Attachments are not allowed -- please post any files to the appropriate
folder in the Files are of the Support Web Site.
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor ---------------------~-->
Buy Ink Cartridges or Refill Kits for Your HP, Epson, Canon or Lexmark
Printer at Myinks.com. Free s/h on orders $50 or more to the US & Canada. http://www.c1tracking.com/l.asp?cid=5511
http://us.click.yahoo.com/l.m7sD/LIdGAA/qnsNAA/dkFolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/