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RE: [EnergyPlus_Support] Latitude parameter in PV module

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Latitude parameter in PV module
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Mon, 8 Sep 2003 11:15:13 -0500
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Miguel:  You are correct.  It is not responding to the latitude.  A 
bug report has been posted (CR#5976).
Mike


On 5 Sep 2003, at 12:13, Miguel Angel Pascual wrote:

> Dear Mike,
> 
> Thanks for your answer, but let me insist on the question a little
> bit. You have run the simulation with different weather files (I
> suppose with different data in Global Horizontal Radiation field) so
> it's clear that the results should be different. But if you take a
> weather file, and just change the latitude, you will get the same
> production that in the unchanged weather file simulation.
> 
> I have tried it with annual simulation of the example "purchair.idf"
> with weather files: "USA_IL_Chicago-OHare_TMY2.epw" ,
> "USA_FL_Tampa_TMY2.epw" and "ESP_Barcelona_IWEC.epw". For each of this
> weather files I get the same production regardless the latitude value
> I write in the weather file. Of course, the PV-production in Chicago,
> Tampa and Barcelona are different.
> 
> 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.
> 
> Thanks for your patience.
> 
> 
> 
> 
> 
> 
> -----Mensaje original-----
> De: Michael J. Witte [mailto:mjwitte@xxxxxxxx] 
> Enviado el: jueves, 04 de septiembre de 2003 18:25
> Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Asunto: RE: [EnergyPlus_Support] Latitude parameter in PV module
> 
> 
> It works OK here.  I ran the same inputs with Chicaog and Phoenix
> weather data and got different results.  The eplus.def file is a list
> of defaults and it does not reflect what is actually used for the
> TRNSYS run.  To see the listing from the actual TRNSYS run, see the
> .trn output file in the same folder with the other EnergyPlus outputs
> for your run.  Search for "latitude" and the trn file will list all of
> the parameters for the location that was used.
> 
> If you find that the location data is changing in the trn file but you
> are still getting the same PV power output, check the inverter
> capacity.  If it is too small, then it will choke the power output
> such that different locations might produce the same amount of power.
> But the number of hours of daylight would be different, so this might
> not be the issue.
> 
> Mike
> 
> 
> On 4 Sep 2003, at 15:11, Miguel Angel Pascual wrote:
> 
> > Dear Linda,
> > 
> > I have already changed the latitude in the weather file (N2 field in
> > location object) and I still get the same PV electrical production.
> > I don't know if this is right: I have checked the Eplus.def file in
> > the "trnsyspv" directory and the LAT column in the radiation
> > processor is always 43.1. Do you know what's going on?
> > 
> > Thanks in advance,
> > 
> > 
> > 
> > -----Mensaje original-----
> > De: Linda Lawrie [mailto:linda@xxxxxxxxxx] 
> > Enviado el: jueves, 04 de septiembre de 2003 14:20
> > Para: EnergyPlus_Support@xxxxxxxxxxxxxxx;
> > EnergyPlus_Support@yahoogroups. com
> > Asunto: Re: [EnergyPlus_Support] Latitude parameter in PV module
> > 
> > 
> > At 06:46 AM 9/4/2003, Miguel Angel Pascual wrote:
> > 
> > >Hello,
> > >
> > >I am running a simulation with a PV object. After running a
> > >simulation, I have changed the latitude in the "Location" object,
> > >but I got the
> > same
> > >electrical production. Can anybody explain me where or how is the
> > >latitude defined in the PV object?
> > 
> > The PV uses the same latitude as the Location and/or Weather File
> > used by simulation.  In fact, you must use a weather file for the
> > current PV object and the weather file location information
> > overrides the Location object in the input file.
> > 
> > So, you would need to change the weather file's latitude/longitude
> > in order to see a change.
> > 
> > Cautiously.
> > 
> > 
> > Linda
> > 
> > EnergyPlus WebSite: http://www.energyplus.gov
> > Owner: EnergyPlus_Support list
> > Member: EnergyPlus Development Team
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> > 
> > 
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> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@xxxxxxxx
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References:
- RE: [EnergyPlus_Support] Latitude parameter in PV module
  - From: Michael J. Witte
- RE: [EnergyPlus_Support] Latitude parameter in PV module
  - From: Miguel Angel Pascual

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