measurement and comparison of solar radiation estimation models ...
measurement and comparison of solar radiation estimation models ...
measurement and comparison of solar radiation estimation models ...
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CHAPTER 5<br />
ANALYSIS OF DIFFUSE RADIATION MODELS<br />
Hourly global <strong>radiation</strong> on horizontal surfaces is available for many stations, but<br />
relatively few stations measure the hourly diffuse <strong>radiation</strong>.<br />
In this section, 8 <strong>models</strong> have been reviewed <strong>and</strong> 4 new <strong>models</strong> were estimated<br />
to establish the monthly- average diffuse <strong>radiation</strong>. They were grouped <strong>and</strong> examined<br />
not like in the past chapter, but according to type <strong>of</strong> the equation expressed the monthly<br />
average daily diffuse <strong>solar</strong> <strong>radiation</strong> as a function <strong>of</strong> measured sunshine duration,<br />
measured global <strong>solar</strong> <strong>radiation</strong> <strong>and</strong> extraterrestrial <strong>solar</strong> <strong>radiation</strong>.<br />
5.1. 퐇 퐝 as a Function <strong>of</strong> H <strong>and</strong> the Clearness Index (Group 1)<br />
5.1.1. Tasdemiroglu <strong>and</strong> Sever’s Model<br />
The model was prepared for Turkey in general. The equation is:<br />
H = H 1.6932 − 8.2262 H<br />
H<br />
+ 25.5532 <br />
Hₒ Hₒ <br />
<br />
− 37.807 H<br />
Hₒ <br />
<br />
+ 19.8178 H<br />
Hₒ <br />
<br />
5.1.2. Tiris et al. Model<br />
(5.1.1)<br />
An analysis <strong>of</strong> monthly average daily diffuse <strong>solar</strong> <strong>radiation</strong> in Gebze, Turkey<br />
was presented as follows:<br />
H = H 0.583 + 0.9985 H<br />
H<br />
− 5.24 <br />
Hₒ Hₒ <br />
<br />
+ 5.322 H<br />
Hₒ <br />
<br />
(5.1.2)<br />
24
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