Answered: a) A house walls that are 11 cm thick…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter11: Energy In Thermal Processes

Section: Chapter Questions

Problem 40P: The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about...

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a) A house walls that are 11 cm thick and have an average thermal conductivity four times that of glass wool. Assume there are no windows or doors. The walls’ surface area is 850000 cm2 and their inside surface is at 18°C, while their outside surface is at 7°C. (Thermal conductivity of glass wool is 0.042 W/m°C) (i) Calculate the rate of heat conduction through house walls? Answer for part 1 (ii) How many 150W room heaters would be needed to balance the heat transfer due to conduction? (approximate number) Answer for part 2 b) A spherical infrared heater of radius 5.1 cm has an emissivity of 0.8. What temperature must it run at if the required power is 0.56 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =

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