1) The walls of a house are 17 cm thick and have an average thermal conductivity four times that of glass wool. The walls' surface area is 850000 cm? and their inside surface is at 22°C, while their outside surface is at 7°C. (Thermal conductivity of glass wool is 0.042 W/m'C). Calculate. O The rate of heat conduction through house walls: (i) Amount of heat in Joules, conducted in 5 min:

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1) The walls of a house are 17 cm thick and have an average thermal conductivity four times that of glass wool. The walls' surface
area is 850000 cm? and their inside surface is at 22°C, while their outside surface is at 7°C. (Thermal conductivity of glass wool is
0.042 W/m°C). Calculate.
O The rate of heat conduction through house walls:
(1) Amount of heat in Joules, conducted in 5 min:
2) A spherical infrared heater of radius 6.5 cm and an emissivity of 0.81 radiates 0.48 kW of power. Given, Stefan's constant = 5.67x10
* Wm-2K+. Calculate.
Temperature of the heater in Celsius:
Transcribed Image Text:1) The walls of a house are 17 cm thick and have an average thermal conductivity four times that of glass wool. The walls' surface area is 850000 cm? and their inside surface is at 22°C, while their outside surface is at 7°C. (Thermal conductivity of glass wool is 0.042 W/m°C). Calculate. O The rate of heat conduction through house walls: (1) Amount of heat in Joules, conducted in 5 min: 2) A spherical infrared heater of radius 6.5 cm and an emissivity of 0.81 radiates 0.48 kW of power. Given, Stefan's constant = 5.67x10 * Wm-2K+. Calculate. Temperature of the heater in Celsius:
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