Nargis786
Jun 14, 2009, 06:19 AM
Table 2.3 - thermal insulation regulations
maximum u-values of elements/Wm-2 K-1
dwellings - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.25
offices,shops - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.45
industrial,storage - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.45
maximum single-glazed areas
dwellings - (windows) - 15%, (rooflights) - 15%
offices,shops - (windows) - 35%, (rooflights) - 20%
industrial,storage - (windows) - 15%, (rooflights) - 20%
1. a house has a living room with an external wall of area 9.2m2. The single galzed window (U=5.3 W m-2 K-1) is 15% of this area. Calculate the rate of heat loss through this wall on a day when the outside temperature is 10 degrees Celsius less than the inside temperature.
2. a warehouse has the maximum permitted area of single-glazed window and rooflight. It has a height of 4m, one length is 8m, and the other length is 10m.
a) estimate the power requirements of a heating system on a day when the temperature difference in 10 degrees Celsius.
b) how much energy would be saved in a day if the windows and rooflights were double glazed (U=3.0 W m-2 K-1)?
maximum u-values of elements/Wm-2 K-1
dwellings - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.25
offices,shops - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.45
industrial,storage - (floors) - 0.45, (walls) - 0.45, (roofs) - 0.45
maximum single-glazed areas
dwellings - (windows) - 15%, (rooflights) - 15%
offices,shops - (windows) - 35%, (rooflights) - 20%
industrial,storage - (windows) - 15%, (rooflights) - 20%
1. a house has a living room with an external wall of area 9.2m2. The single galzed window (U=5.3 W m-2 K-1) is 15% of this area. Calculate the rate of heat loss through this wall on a day when the outside temperature is 10 degrees Celsius less than the inside temperature.
2. a warehouse has the maximum permitted area of single-glazed window and rooflight. It has a height of 4m, one length is 8m, and the other length is 10m.
a) estimate the power requirements of a heating system on a day when the temperature difference in 10 degrees Celsius.
b) how much energy would be saved in a day if the windows and rooflights were double glazed (U=3.0 W m-2 K-1)?