[esp-r] Re: effect of longitude and latitude on the PV window power output?

[Jon Hand]

The first issue is -28.9 degrees.   How was this number arrived at?  The definition of longitude
difference was given in a previous email.

There are few cities which are ~28 degrees away from the local time meridian.  There are
some places in Portugal which are slightly more than 15 degrees
away from their time meridian and there is China which is one time zone but ~50 degrees
wide.

Using -28.9 will shift the sun position quite a bit, it is almost certainly incorrect (unless you are in China)
and if you looked at the predictions for solar early and late in the day you would probably notice that
the sunrise and sunset were at an extreme time.   There are web sites that allow you to plot sunrise
and sunset times at different locations and you might use these as a check.

Regards, Jon Hand

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Leepaul [esprfans at hotmail.com]
Sent: 01 January 2009 00:59
To: esp-r email list email list
Subject: [esp-r] Re: effect of longitude and latitude on the PV window  power   output?

Dear, all

My question is: if I have a weather file of a city ,city's logitude difference is shown as -28.9, then do I have to modify it and make it between  -15 and 15 degree?
if I don't modify it, then I will get a wrong simulation result?

thank you for your time.
regard,
paul


> From: jon at esru.strath.ac.uk
> To: esprfans at hotmail.com; esp-r at lists.strath.ac.uk
> Date: Tue, 30 Dec 2008 09:53:09 +0000
> Subject: RE: [esp-r] effect of longitude and latitude on the PV window power output?
>
>
> Changes in longitude will result in the angle of the sun
> which will alter the geometric relationship between the sun
> and a surface.
>
> It should be easy to test this running a simulation and dumping
> the PV performance to a file and then altering the MODEL SITE position and making
> a second run and looking at the differences.
>
> -Jon Hand
> ________________________________________
> From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Leepaul [esprfans at hotmail.com]
> Sent: 27 December 2008 02:06
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] effect of longitude and latitude on the PV window power output?
>
> Dear all,
>
> what is the effect of longitude and latitude on power output of the vertical PV windows toward the west.
>
> for example, I'm simulating the vertical PV window toward the west located at London, fisrtly I get a power output from the original weather file, then keep anything of London weather file unchanged but change London' longitude, then what will happen for power output?
>
> regards,
> paul
>
> ________________________________
> MSN保护盾，十八般武艺保障MSN安全！ 现在就下载！<http://im.live.cn/safe/>


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