Lecture 34 Examples

# Lecture 34 Examples - inside of the wall is 15 °C and the...

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Example 1: Consider the following real Brayton cycle that uses air as its working fluid. The cycle operates with a pressure ratio of r p = 4.2, the compressor inlet temperature is 300 K, and the turbine inlet temperature is 1325 K. The heating value of the fuel is 43 kJ/g-fuel. Assume the air standard model is valid where the air has mean effective specific heat ratio of 4/3. The compressor and the turbine operate with isentropic efficiencies of η C = 75 % and η T = 85 % respectively. Complete a thermodynamic analysis of the cycle.

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Example 2: A concrete wall of a building is 6 m wide, 8 m high, and 0.25 m thick. The temperature of the
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Unformatted text preview: inside of the wall is 15 °C and the outside of the wall is 4 °C. Calculate the rate of heat loss through the wall and the amount of heat lost through the wall in 10 hours. Example 3: A 10-m long section of a steam pipe, with a diameter of 15 cm, passes through an open space at 25 °C. The average temperature of the outer surface of the pipe is 200 °C, and the average heat transfer coefficient on that surface is 40 W/m 2-K. Determine the rate of heat loss from the steam pipe....
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