HW4 spring 2011(1)

HW4 spring 2011(1) - entrapped ideal gas is 0.15 m 3 . The...

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CHEG 2313 Thermo I HW#4 Spring 2011 Due Wednesday, February 23, 2011 in class. 1. In class, we discussed that generally k k k k gh M H M + 2 2 ν because the enthalpy change is often more sizeable than the height and velocity changes of the fluid. Compare these energy terms for steam ( 1 = k M kg) being heated at near atmospheric pressure from 200 ° C to 225 ° C that: a) Falls a distance of 190 m (the height of the St. Louis arch which is about 60 stories). Assume no velocity change. (3 pts) b) Has a velocity of 186.4 mph (speed of a bullet train). Assume no height change. (3 pts) 2. A frictionless piston-and-cylinder system is subjected to 1.013 bar external pressure. The piston mass is 400 kg and it has an area of 0.2 m 2 . The initial volume of the
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Unformatted text preview: entrapped ideal gas is 0.15 m 3 . The piston and cylinder do not conduct heat, but heat can be added to the gas by a heating coil. The gas has an initial temperature of 298 K and enough heat is added to triple the volume. Calculate the amount of heat that must be added to accomplish this change, the final temperature of the gas, and the work the gas does against its surroundings. (8 pts) Given: C v = 21 J/mol*K for the ideal gas. 3. Sandler 3.10 (5 pts) 4. Steam at 150 bar and 700C is to undergo a Joule-Thomson expansion to atmospheric pressure. a) What will be the temperature of the steam after the expansion? (3 pts) b) What would be the downstream temperature if the steam were replaced by an ideal gas? (3 pts)...
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This note was uploaded on 04/01/2011 for the course CHEG 2313 taught by Professor Staff during the Spring '11 term at Arkansas.

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