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A small house is built in the arctic. It has four square walls of 500 ft2 each. For simplicity, we will assume it has no windows, and we are only interested in calculation the heat loss through the four walls. A total of one hundred Watts (100 kW) escape through the four walls.
a) Calculate the Thermal Conductivity ( K ) in W/(m K) given the following data:
X: Thickness of walls is six inches ( 6" )
T1 : inside temperature is ( 60 F )
T2 : outside temperature is ( - 50 F )
b) Calculate the Thermal Conductivity ( K ) in BTU/(s.ft. oR)
Hint: British Thermal Unit (BTU) is the American system unit for energy.
A rectangular channel 5 m wide carries a discharge of 10 m^3/s at a uniform depth of 3 m. The channel is running on a slope of 0.0025 m/m. Estimate wall shear stress and friction velocity. Assume the density of flowing water as 1000 kg/m^3.
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A student counted 92,90,92,91,93, and 91 paces in six trials of walking along a course of 200 ft known length on level ground. Then 85,86,86 and 84 paces were counted in walking four repititions of an unknown distance AB.
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You are to design a chlorination tank for killing microorganisms in the effluent from a wastewater treatment plant. It is necessary to remove 99% of active bacteria in a wastewater flow of 120 m 3 /hr.
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How much of a reduction in the automobile emission rate would be required to achieve the maximum eight-hour average NAAQS for CO at steady state 9ppmv (10.3 mg/m3)?
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