Global solar radiation estimation from commonly available meteorological data for Bangladesh

Sustainable Energy Research

Table 6 Cloud cover-based models and their error estimations

Model no.	Model type	Equations	\(R^2\)	MBE	MPE	MARE	RMSE	t stat
22	Linear	\(H/H_0 = -0.2302C + 0.5713\)	0.993695408	0.021340195	0.656623	0.071691	0.33156	0.213912
23	Quadratic	\(H/H_0 = -0.4585C^2 + 0.2087C + 0.4942\)	0.995392681	0.015789962	0.490597	0.058503	0.283438	0.185052
24	Third degree	\(H/H_0 = 1.9104C^3 - 3.1785C^2 + 1.3352C + 0.3669\)	0.99540268	0.01358356	0.448265	0.048137	0.28313	0.159303
25	Fourth degree	\(H/H_0 = -11.449C^4 + 23.22C^3 - 16.729C^2 + 4.7227C + 0.0963\)	0.995752521	0.000808352	0.800828	0.054337	0.272144	0.009851
26	Fifth degree	\(H/H_0 = 120.19C^5 - 299.15C^4 + 281.59C^3 - 124.07C^2 + 25.073C - 1.3032\)	0.997452146	0.015181073	0.113112	0.034455	0.210776	0.239501
27	Logarithmic	\(H/H_0 = -0.083\hbox {ln}(C) + 0.386\)	0.990582324	0.016444457	0.887773	0.090946	0.405233	0.1347
28	Exponential	\(H/H_0 = 0.5819\hbox {exp}(-0.509C)\)	0.993189811	0.036221558	0.347545	0.072874	0.344598	0.350561
29	Power	\(H/H_0 = 0.3862C^{-0.184}\)	0.989958374	0.037624897	0.44366	0.091626	0.418442	0.299433