1. Take home
un-shaded window opening in south west wall is 2.5 metre wide and it
has vertical height of 3 meter. calculate : a. the heat gain through the
opening assuming single vertical glass is used, b. percentage reduction in
the direct solar radiant transmission by slopping the glass inward toward
the bottom so that of the glass is recessed 0.5 metre with respect to the
top use the following data direct radiation normal to ray is 2600kilojoule
per square metre per hour ,diffuse radiation normal to the vertical glass is
335kilojoule per square metre per hour , altitude angle of the sun is 60
degree , sun's azimuth angle is 30 degree west of south, the out door
temperature is 40 deg centigrade, outside surface conductance is 62
kilojoule per square metre per hour per deg centigrade , indoor temp is 21
deg centigrade , inside conductance is 42 kilojoule per square metre per
hour per degree centigrade. transimittivity of glass is 0.8 and reflectivity of
glass is 0.12
