A Comparison of Models for Estimating Solar Radiation from Sunshine Duration in Croatia

Table 4

Comparison of monthly average daily global horizontal radiation calculated using Rietveld model with measurements for seven Croatian locations. and are in kWh/m².

Location		Month
		1	2	3	4	5	6	7	8	9	10	11	12
Dubrovnik		1.682	2.359	3.606	4.882	5.978	6.839	7.355	6.835	4.893	3.262	1.988	1.682
		1.673	2.384	3.878	5.078	6.187	7.292	7.457	6.670	4.883	2.718	1.995	1.721
	PE	0.6%	-1.0%	-7.0%	-3.9%	-3.4%	-6.2%	-1.4%	2.5%	0.2%	20.0%	-0.4%	-2.3%
Gospić		1.127	1.793	3.165	4.404	5.329	6.540	6.874	6.055	3.969	2.396	1.310	1.069
		1.205	1.966	3.202	4.509	5.472	6.695	6.926	6.006	3.867	2.358	1.206	1.083
	PE	-6.5%	-8.8%	-1.1%	-2.3%	-2.6%	-2.3%	-0.7%	0.8%	2.6%	1.6%	8.6%	-1.3%
Parg		1.094	1.651	2.932	4.152	4.849	6.019	6.139	5.678	3.598	2.185	1.318	1.139
		1.103	1.666	3.005	4.164	4.837	6.011	5.884	5.473	3.470	2.118	1.103	1.126
	PE	-0.8%	-0.9%	-2.4%	-0.3%	0.3%	0.1%	4.3%	3.7%	3.7%	3.2%	19.5%	1.2%
Rijeka		1.360	2.068	3.241	4.595	5.386	6.358	6.686	6.318	4.061	2.691	1.485	1.247
		1.216	1.931	3.258	4.520	5.428	6.655	6.771	6.219	4.092	2.618	1.329	1.102
	PE	11.8%	7.1%	-0.5%	1.7%	-0.8%	-4.5%	-1.3%	1.6%	-0.8%	2.8%	11.7%	13.1%
Split		1.627	2.307	3.605	4.865	5.939	6.965	7.463	6.748	4.701	3.158	1.839	1.527
		1.592	2.362	3.803	4.979	6.113	7.061	7.362	6.509	4.789	3.127	1.884	1.544
	PE	2.2%	-2.3%	-5.2%	-2.3%	-2.8%	-1.4%	1.4%	3.7%	-1.8%	1.0%	-2.4%	-1.1%
Zadar		1.456	2.253	3.531	4.805	5.980	7.128	7.508	6.534	4.671	2.970	1.692	1.336
		1.530	2.389	3.883	5.228	6.322	7.425	7.583	6.653	4.709	2.727	1.757	1.368
	PE	-4.8%	-5.7%	-9.1%	-8.1%	-5.4%	-4.0%	-1.0%	-1.8%	-0.8%	8.9%	-3.7%	-2.4%
Zagreb		1.017	1.661	2.991	4.337	5.288	6.159	6.210	5.713	3.736	2.274	1.210	0.912
		1.015	1.689	3.078	4.454	5.274	6.170	6.155	5.541	3.587	2.293	1.149	0.909
	PE	0.2%	-1.6%	-2.8%	-2.6%	0.3%	-0.2%	0.9%	3.1%	4.2%	-0.8%	5.3%	0.3%