Solar radiation

The earth’s orbit is elliptical. The sun’s surface temperature is approximately 6,000°C (10,000°F). The radiant heat flux outside the atmosphere of the earth is 2200 W/m2.

The extraterrestrial radiant flux, E0, is 1418 W/m2 on January 4 1325 W/m2 on July 5 1360 W/m as mean value The solar radiation at sea level is 1370 W/m2.

The energy spectrum:

0. 29 — 0.40 |im (ultraviolet) 9%

0. 40-0.70 (im (visible) 39%

0. 70 — 3.50 (im (infrared) 52%

RADIATION FROM OBJECTS AT ROOM TEMPERATURE

5 WAVELENGTH (^m)

LONG WAVE INFRARED

подпись: radiation from objects at room temperature
 
5 wavelength (^m)
long wave infrared
Peak value : 0.50 |im

Solar radiation

Oi—

0.3

0.5

2

UV VISIBLE SOLAR SPECTRUM INFRARED

SOLAR RADIATION (SHORT WAVE)

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning


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