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Solar Insolation Calculator

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Posted by Jeff on June 19, 2006, 10:17 pm
   I remember seeing a solar insolation calculator where you input
various data, such as collector angle and city (or latitude and
longitude) and it gives insolation for time of day and time of year.

   Where is that, or a similar calculator?

  I've been looking at the "Instantaneous Collector Efficiency" which is

Temperature Change/ Insolation

   As it seems that increasing the cost of a collector improves low
condition performance (low solar insolation) most. So I'd like to see
what fraction of the days solar insolation comes at a time when a better
insulated collector would make a big difference.


Posted by dold on June 19, 2006, 11:54 pm

Is entirely US-centric, based on real observation points around the US.

http://solardat.uoregon.edu/SoftwareTools.html  has some tools that show the
sun path across the sky.  I don't know if those would be useful for you.

http://www.builditsolar.com/SiteSurvey/site_survey.htm  includes some work
looking at the shading that hits your panels.

http://www.gcstudio.com/suncalc.html  provides a wealth of detail about the
location of the sun at a particular time.

http://www.kyocera.co.uk/  has a link to a German calcualtor that I didn't

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Jeff on June 20, 2006, 5:22 am
 dold@XReXXSolar.usenet.us.com wrote:

   Thanks! It'll take me a while to get through them!


Posted by dold on June 20, 2006, 6:39 pm
I see that there is a set of international points also.  I had been using a
shortcut to my nearest station, about 60 miles away, and hadn't visited the
main link in a while.

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Gary on June 20, 2006, 3:12 am
 Jeff wrote:

Hi Jeff,
I think this may be the one you are thinking about:
I based it on the algorithms in "Solar Thermal Engineering", Lund

Sounds like you have an efficiency measurment procedure in mind, but this is the
one I use:




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