100302_rec4

100302_rec4 - • Irreversible adiabatic compression from P...

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16.050 Thermal Energy Recitation #4 – Fall 2002 Problem 1: The Concorde is flying at its cruising altitude of 60,000 ft when suddenly one of the cockpit windows cracks and fails, leaving a hole of 5 cm diameter. How much time do the pilots have to put on their oxygen masks given that they pass out at a pressure of 0.1 bar? The initial pressure and temperature in the cockpit are 1 bar and 290K, and the cockpit volume is 10 m 3 . Assume that air is a perfect gas with γ = 1.4, the cockpit is well insulated, and that the flow out of the cockpit is choked. Page 1 of 1
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Problem 2: One kg of air undergoes a cycle as follows:
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Unformatted text preview: • Irreversible adiabatic compression from P 1 = 1 bar, T 1 = 300 K, to P 2 = 30 bar where s 2-s 1 =60 J/kgK [1=>2] • Constant pressure heat input until T 3 = 1500 K [2=>3] • Adiabatic, irreversible expansion until P 4 = 1bar where s 4-s 3 =110 J/kgK [3=>4] • Constant pressure heat rejection [4=>1] Assume air behaves as a perfect gas with cp= 1 kJ/kgK. Find: dQ a) ∫ T b) ∆ S total assuming that the source and sink temperatures of the universe are each constant and equal to 2000 K and 300 K, respectively. c) Sketch the process on a T-s diagram Page 2 of 2...
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This note was uploaded on 01/28/2012 for the course AERO 16.050 taught by Professor Zoltanspakovszky during the Fall '02 term at MIT.

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100302_rec4 - • Irreversible adiabatic compression from P...

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