Prbset04

# Prbset04 - containing gas and the other evacuated The...

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CHEMICAL ENGINEERING THERMODYNAMICS COURSE NO.: CHEG5301 STUDENT: ___________________ COURSE: Thermodynamics INSTRUCTOR: Prof. Anderson SUBJECT: Problem Set 04 DUE: Wednesday, Sept. 17, 2008 1. A 0.3-m 3 tank containing air at 17 bar and a temperature of 25 ° C is to be exhausted to the atmosphere through a very cleverly designed engine. The engine is directly connected to the tank, and the air exiting from the engines is exhausted to the atmosphere (atmospheric pressure is 1 bar and the ambient temperature is 25 ° C). Assume that there is no transfer of heat between the surroundings and either the tank or the engine, and determine the maximum work obtainable from this system. Use the expression developed in class for the reversible work from a flow process. You may also assume that air behaves ideally with a constant heat capacity, C P = 7/2 R. Would you expect to obtain more or less work if the tank and the engine were kept at a constant temperature of 25 ° C? 2. An isolated chamber with rigid walls is divided into two equal compartments, one
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Unformatted text preview: containing gas and the other evacuated. The partition between the compartments ruptures. After the passage of sufficiently long period of time, the temperature and pressure are found to be uniform throughout the chamber. If the filled compartment initially contains an ideal gas of constant heat capacity at 1 MPa and 500 K, what is the final temperature and pressure in the chamber? If the filled compartment initially contains steam at 1 MPa and 500 K, what is the final temperature and pressure in the chamber? What is the change in entropy for both cases? 3. A block of metal of total heat capacity nC P is initially at a temperature of T 1 , which is higher than the ambient temperature T 2 . Determine the maximum amount of work that can be obtained on cooling this block to ambient temperature. Calculate the work for the case where nC P is 2 cal/K, the initial temperature, T 1 , is 100 ° C and ambient temperature, T 2 , is ° C...
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## This note was uploaded on 08/26/2010 for the course CHEG 5301 taught by Professor Anderson during the Fall '08 term at UConn.

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