Estimation of global radiation for Sri Lanka
- Univ. of Peradeniya (Sri Lanka)
There are several formulae that relate global radiation to other climatological parameters such as sunshine hours, relative humidity, maximum temperature, and average temperature. In this paper a generally accepted modified form of the formula first introduced by Angstrom is used. It relates global radiation to hours of sunshine that have been measured for several years in many of the meteorological stations in Sri Lanka. The annual average of the ratio of the hours of sunshine to the length of the day, i.e., annual average of (S/Z), is found to vary considerably and to lie in the range 0.42-0.66. Fre're et al., have found, using data from many parts of the world, a general graphical representation for the variation of a and b with annual average (S/Z) lying in the range 0.28 to 0.75. This variation of a and b can be expressed as quadratic functions are modified and used to determine a and b values for stations in Sri Lanka.
- OSTI ID:
- 6125732
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 47:5; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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