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Civil Engineering
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Topic Topic: Thermodynamics Post ReplyNew Question
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Joined: 08 November 2005
Location: United States
Posts: 1
Posted: 08 November 2005 at 11:34pm | IP Logged Quote Ntcopper

I am have trouble solving three homework questions and would appreciate some help.  The questions are some what involved, but would appreciate any help.

Question 1: Refrigerant-134a enters an adiabatic compressor as sarturated vapor at 160 kPa at a rate of 2m^3/min and is compressed to a pressure of 900 kPa.  Find the minimum power that must be supplied to the compressor.

Question 2: A 1.2 ft^3 well-insulated rigid can intitially contains refrigerant-134a at 140 psia and 70 F.  Now a crack develops in the can, and the refrigerant starts to leak out slowly, assuming the refigerant remaining in the can has undergone a reversible, adiabatic process.  Find the final mass in the can when the pressure drops to 20 psia.

Question 3:Helium gas is compressed from 90kPa and 30C to 450kPa in a reversible, adibatic process.  Find the final tempature and the work done, assuming the process takes place (a) in a piston-cylinder
(b) in a steady-flow compressor

Nick T
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Joined: 07 February 2006
Location: Malaysia
Posts: 5
Posted: 07 February 2006 at 1:00pm | IP Logged Quote True_na

This question is under mechanical part not civil

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