measurement and comparison of solar radiation estimation models ...

According to these data, Turkey's average annual total sunshine duration is
calculated as 2,640 hours (daily total is 7.2 hours), and average total radiation pressure
as 1,311 kWh/m²-year (daily total is 3.6 kWh/m²). Solar energy potential is calculated
as 380billion kWh/year. In Table 1, it can be seen that Turkey’s monthly-average solar
radiation values and sunshine duration.
Table 1. Turkey’s monthly-average solar radiation data
(Source: EIE; June,2011)
Months Monthly-average solar radiation Sunshine dur.
(Kcal/cm2-month) (kWh/m2-month) (h/month)
January 4.45 51.75 103.0
February 5.44 63.27 115.0
March 8.31 96.65 165.0
April 10.51 122.23 197.0
May 13.23 153.86 273.0
June 14.51 168.75 325.0
July 15.08 175.38 365.0
August 13.62 158.40 343.0
September 10.60 123.28 280.0
October 7.73 89.90 214.0
November 5.23 60.82 157.0
December 4.03 46.87 103.0
Total 112.74 1,311 2,640
Average 308.0 kcal/cm2-day 3.6 kWh/m2-day 7.2 h/day
The main objectives of the present study are:
To establish monthly-average daily global and diffuse radiation values for
Izmir, Turkey.
To develop new models via to the equations in the literature for Izmir.
To compare all the models by using statistical methods.
This thesis is composed of 7 chapters. In order; Chapter 1 is the introduction
part. Chapter 2 gives a brief explanation of literature survey. Chapter 3 is concerned
with the solar radiation measurements. First part is prepared for the experimental data.
Such components as pyranometer, data logger specifications are expressed one by one.
Last part is for statistical methods. Chapter 4 consists of the analysis of global solar
radiation and its models. New developed models are also mentioned in this chapter.
6