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The concrete walls and roof of a garage are 15-cm thick. The inside dimensions of the garage are 8-m long, 6-m wide, and 2.5-m high. The door is made of 12-mm thick hardwood and is 6-m wide and 2.5-m high. The garage is modeled in the figure below. On a cold day, the garage is electrically heated. The inside and outside surface temperatures are 5oC and -10oC, respectively. Determine the heat fluxes through the walls, roof, and the door, and the total heat transfer rate through the walls, roof, and the door. K concrete = 0.663w/mk, K wood= 0.17 w/mK
a circular curve of highway is designed for traffic moving at 85 kmh. assume the traffic consists of cars without
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Determine the mass flow rate of the air passing through this engine and the rates of heat addition and rejection when this engine produces 1000 hp. Assume constant specific heats at room temperature.
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