An Overview of One-Sun Solar Thermal Technology
An Overview of One-Sun Solar Thermal Technology
An Overview of One-Sun Solar Thermal Technology
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Performance Basics<br />
• System efficiency ≡ η sys = Q sav /Q inc<br />
• Q inc ~ 3-6 kWh/m 2 /day, 100-200 kWh/ft 2 /year<br />
• <strong>Solar</strong> Fraction ≡ f sol = Q sav /Q fuel,no-solar<br />
• η sys ≈ constant ≈ 0.4 for active system<br />
1.00<br />
0.80<br />
0.60<br />
Active <strong>Solar</strong> Water Heating<br />
(216 locations in the continental U.S.)<br />
<strong>Solar</strong> Fraction<br />
Efficiency<br />
1.00<br />
0.80<br />
0.60<br />
0.40<br />
0.40<br />
0.20<br />
0.20<br />
0.00<br />
0.00<br />
0.0 5.0 10.0 15.0 20.0 25.0 30.0<br />
<strong>An</strong>nual-Average Ambient Temperature ( o C)<br />
SEET <strong>Solar</strong> <strong>Thermal</strong> Seminar 7/26/07
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