Skip to main content

Table 2 Empirical models to calculate solar radiation from sunshine duration

From: Global solar radiation estimation from commonly available meteorological data for Bangladesh

Models

Regression equations

Source

Linear

\(H{/}H_0= a + b (S{/}S_0)\)

Angstrom (1924), Prescott (1940)

Quadratic

\(H{/}H_0 = a + b (S{/}S_0) + c (S{/}S_0)^2\)

Akinoglu and Ecevit (1990)

Third-degree

\(H{/}H_0 = a + b (S{/}S_0) + c (S{/}S_0)^2 + d (S{/}S_0)^3\)

Ertekin and Yaldiz (2000)

Logarithmic

\(H{/}H_0 = a + b \times \log (S{/}S_0)\)

Ampratwum and Dorvlo (1990)

Exponential

\(H{/}H_0 = a \times \exp [b(S{/}S_0)]\)

Almorox and Hontoria (2004)

Power

\(H{/}H_0 = a(S{/}S_0)^{\mathrm{b}}\)

Sen (2007)