Re: [EnergyPlus_Support] A question

[JRR <energy.wwind@xxxxxxx>]

So -- your location is very near the Equator, but still North of it.
Since we know that direct beam is about 2.5 to 1 ratio Summer to Winter at 40 deg latitude
with no cloud cover and this is less..........the sun is high overhead all year.
The drop outs in Jun, Oct, Nov are from large storms / hurricanes.  They take 4 to 7
days to pass, blowing that month's daily average insolation given in wh/m2, probably on
a horizontal surface.  So you're in a tropical marine climate........
Next...

Eman Tora wrote:

 

Greetings,

To find the direct normal solar radiation for College Station, TX, I went to the following web site:

http://www.eere.energy.gov/buildings/energyplus/cfm/weather_data.cfm

Then, I chose the country, the state, the city then clicked on the Stat tab and get solar data. Here is what I got: 

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
	4311	4089	4543	4656	4756	3564	4865	4942	4264	2758	2725	4440

 

 I have two questions:

1. What are the units? The web site says Wh/m2 but it should be per a time basis. It looks like per day

but the wording of monthly average gives the impression per month.

2. The trend for the DNI does not seem to make much sense to me. How can June

be 3564 and Janurary be higher 4311.

Your input will be greatly appreciated.

Many thanks.

E. Tora

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