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window recession

hi guys, i've got a little problem with the recession of a window while calculating the solar heat gain through it. till now i've been neglecting the effect of recession but for this problem the window is recessed by 60 cm.

window pane (facing south) located at 30N latitude on the 21st of june at

4.00 pm.

the window dimension is 4m x 2.5 m = area of 10 m^2.

the solar heat gain is 546 W/m^2 the altitude correction is 1.0125 dew point correction is 0.93 haze correction is 0.9 steel sash correction is 1.17 shading coefficient of the glass is 0.85

can anyone tell me how the recession of the window is considered in calculating the solar radiation heat gain through the glass window.

thx

-- Hasta Luego

Irshaad (Faster than Bruce Lee)

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Irshaad
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By reducing the window's lighted aperture?

Brian W

Reply to
Brian Whatcott

yes i thought of it, say due to the recession, only 70% receives direct sunlight.

this means 0.7*10 = 7 m^2 and the remaining receives diffused radiations = 3 m^2

but now how to calculate the solar heat gain, i'm using the carrier solar heat gain tables which includes solar heat gain for different latitudes and solar times, but a problem is that the value 546 W/m^2 includes both direct and diffuse radiation..

anyone from the air conditioning / building services field to help??

thx

-- Hasta Luego

Irshaad (Faster than Bruce Lee)

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calculating

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Irshaad

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