Structures exposed to the sun can store the rmal energy. It is proposed to use t

Question

Structures exposed to the sun can store the rmal energy. It is proposed to use the structure below for complementary heating of a southward facing room. the structure behaves as a flat plate solar collector where the concrete wall is the absorber. Within the gap spacing is air that is heated from the concrete wall. the air flows upward due to the chimney effect. the room temperature TR is 45 C. the outside air temperature T amb is 0 C. the solar incident flux G is 900 W/m2. the air gap spacing is 5 cm, the height of the glass sheet is 2. 4 m, and the depth is 5 m. Estimate the air mass flowrate [kg/min], the hot air exit temperature, and the net heat transfer rate to the room. To estimate the se values make the following assumptions. i. To determine the air velocity assume that the air within the gap equilibrates quickly to the concrete wall temperature. ii. Assume the glass and wall act as a flat plate collector as described in class. the air flow does not affect the flat plate collector performance. iii. Assume that the hot air exit temperature is equal to the concrete wall temperature. iv. All pressure are at atmospheric.

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