A room has a window fixed with a pane of area `1.2m^(s)` The glass has thickness `2.2mm` If the temperature outside the room is `36^(@)C` and the temperature inside is `26^(@)C`
(a) calculate the heat flowing into the room every hour
(b) If the same single pane window is replaced by double paned window with an air gap of `0.50cm` between the two panes calculate the heat flowing into the room every hour
`K_(g) =0.80 Wm^(-1)K^(-1),K_(air)=0.0234Wm^(-1)K^(-1)` .

The area of a glass window is 1.2 m^(2) . The thickness of the glass is 2.2 mm. If the temperature outside is 36°C and the temperature inside is 26°, calculate the heat flowing into the room every hour. Thermal conductivity of glass is 0.8 Wm^(-1) K^(-1) .

A room has s window fitted with a single 1.0mxx2.0m glass of thickness 2mm. (a) Calculate the rate of heat flow through the closed window when the temperature inside the room is 32^(@)C and that outside is 40^(@)C . (b) The glass is now replaced by two glasspanes, each having a thickness of 1mm and separated by a distance of 1mm. Calculate the rate of heat flow under the same condition of temperature. Thermal conductivity of window glass =1.0Js^(-1)m^(-1)C^(-1) and that of air =0.025Js^(-1)m^(-1)C^(-1) .

A room has a 4mxx4mxx10cm concrete roof (K=1.26Wm^(-1)C^(-1)) . At some instant, the temperature outside is 46^(@)C and that inside is 32^(@)C . (a) Neglecting convection, calculate the amount of heat flowing per second into the room through the roof. (b) Bricks (K=0.65Wm^(-1)C^(-1)) of thickness 7.5cm are laid down on the roof. Calculate the new rate of heat flow under the some temperature conditions.

A room has s window fitted with a single 0.1mxx2.0m glass of thickness 2mm. (a) Calculate the rate of heat flow through the clossed window when the temperature inside the room is 32^(@)C and that outside is 40^(@)C . (b) The glass is now replaced by two glasspance, each having a thickness of 1mm and separated by a distance of 1mm. Calculalte the rate of heat flow under the same condition of temperature. Thermal conductivity of window glass =1.0Js^(-1)m^(-1) ^(@)C^(-1) and that of air =0.025Js^(-1)m^(-1) ^(@)C^(-1) .

The area of the glass of a window of a room is 10 m^(2) and thickness 2 mm . The outer and inner temperature are 40^(@)C and 20^(@)C respectively. Thermal conductivity of glass in MKS system is 0.2. The heat flowing in the room per second will be

A room has a 4mxx4mxx10cm concrete roof (K=1.26Wm^(-1) ^(@)C^(-1) . At some instant, the temperature outside is 40(@)C and that inside is 32(@)C . (a) Neglecting converction, calculate the amount of heat flowing per second into the room through the roof. (b) Bricks (K=0.65Wm^(-1) ^(@)C^(-1) of thickness 7.5cm are loid down on the roof. Calculate the new rate of heat flow under the some temperature conditions.

Calculate the rate of loss heat through a glass window of area 1000sq.cm. and thickness 4mm when the temperature inside is 37°C and outside is 5°C ( K for glass =0.0022)

Calculate the rate of loss from a room through a glass window of area 1.5 m^(2) and thickness 2.5 xx 10^(-3) m, when the temperature of the room is 25^(@) C and that of the air outside is 10^(@) C . Assume that the inner glass surface is at the room temperature. [ Thermal conductivity of glass =1.2 "Wm"^(-1) "K"^(-1) ]