Lecture7%20Home%20Heating%20and%20Radiation-slides-1

Lecture7%20Home%20Heating%20and%20Radiation-slides-1 -...

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Today Home heating PLEASE GET A WORKSHEET FROM THE CENTRE DESK Thermal Conductivity More on heat transfers Convection Radiation
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Cabin Problem with Window So 1000 W of heating power are needed to keep a cabin without a window at 11 0 C if the temperature outside is 5 0 C. Assume now that our cabin has two small windows with a total area of 1m 2 . The glass has a thickness of 3.0 mm. How much heating power do we need now for a cabin temperature of T in = 11.3 0 C? k glass = 0.84 W/(m K) 3 m 10 m 10 m
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Cabin Problem with Window Problem is similar to simple cabin problem. Step 1: We want to solve for power now. Step 2: Relevant Physics. Same as before but how do we take the window into account? Step 3: Create a Physics Model. Is the heat through the window in addition? Does it take away from the conduction through the walls? How do we deal with the window area? 3 m 10 m 10 m Window: A = 1.0 m 2
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Cabin Problem with Window The heat has now two ways to get to the outside: conduction through the walls and conduction through the window. The temperatures are 11.3 0 C inside and 5 0 C outside.
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