5. At a time on the sunny day of July 21, the sun shining onto the wall and wind

Question

5. At a time on the sunny day of July 21, the sun shining onto the wall and window at an incident angle of 30 while the incident angle onto a horizontal surface is measured at 45. Assume the window glass have the properties of D = 0.7; d = 0.6; D = 0.1; d = 0.3. The emissivity of the wall is 0.9.

Calculate: (a) Total solar radiation absorbed by the wall; (b) Total solar radiation into the room via window; (c) Total solar radiation reflected away by the window glass

At a time on the sunny day of July 21, the sun shining onto the wall and window at an incident angle of 30° while the incident angle onto a horizontal surface is measured at 45. Assume the window glass have the properties of tn-0.7;- 0.6; D-0.1; -0.3. The emissivity of the wall is 0.9. Calculate: a) Total solar radiation absorbed by the wall (b) Total solar radiation into the room via window; (c) Total solar radiation reflected away by the window glass

Explanation / Answer

incident angle on wall and window glass = 30 deg

incident angle on horizontal surface = 45 deg

lets , assume

A= Total solar radition absorbed by wall=?

B= Total solar radition into the room via window=?

C= Total solar radition reflected away by the window glass=?

therefore assuming total radiation to be 1

we get,

A + B + C = 1

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