An insulated 260-ft3 rigid tank contains air at 40 psia and 180F. A valve connected to the

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An insulated 260-ft3 rigid tank contains air at 40 psia and 180°F. A valve connected to the tank is opened, and air is allowed to escape until the pressure inside drops to 20 psia. The air temperature during this process is maintained constant by an electric resistance heater placed in the tank. Determine
(a) The electrical work done during this process and
(b) The exergy destruction. Assume the surroundings to be at 70°F.
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Thermodynamics An Engineering Approach

ISBN: 978-0073398174

8th edition

Authors: Yunus A. Cengel, Michael A. Boles

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