Sun availability Data

[vikasforsmile]

Dear Sir,

Normally when we discuss Sun availability then it is normally =Sun set-set rise

but i have one data set, in which they are using one constant which is =0.041766 so they using formula "-Sun set-Sunrise/(0.041766)" so i have a question about this constant, why they are using this constant.

please help me.

[André Mermoud]

0.041667 = 1/24.

This constant means one hour in units of days.

[Soldnerkugel]

Dear Sir,

Normally when we discuss Sun availability then it is normally =Sun set-set rise

Not really, as this is missing ECET and BCMT and alread during ECET and BCMT there's some irradiation available, which in fact can only be diffuse beam.

[vikasforsmile]

Sir,

what is the need to consider this constant to calculate sun availability? and what is the difference in b/w with or without constant?

in my case the sun availability:

without constantly is

: sun set:18:56 pm and sun rise: 06:30 am so sun availability = 18:56-06:30 =12:23 hours

with constant is (0.041677)

: sun set:18:56 pm and sun rise: 06:30 am so sun availability = 18:56-06:30/(0.041677) =12:38 hours

so the questions are:

why are they using this constant?

How to they are calculating sun availability?