example 4-2 - Example 4-2 Air with an initial temperature...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Example 4-2 Air with an initial temperature of 60°F and 14.7 psia is compressed adiabatically and quasi-statically in a piston- cylinder assembly. The mass of air is 0.066 lbm. If 1470 ft·lbf of work is done on the gas, find the final temperature and pressure. Assume constant specific heats at 60°F. Solution: From the first law UQW ∆=− Since the process is adiabatic WU =−∆ () 21 v Wm c TT =− Btu CV(air, 60) 0.172 lbm R v cT == = v W mc o 2 1Btu 1470ft lbf 778ft lbf 60 F Btu 0.0661 lbm 0.172 lbm R T ⎛⎞ −⋅ ⎜⎟ ⎝⎠ o 2 227 F T = To find the final pressure, note that this is an adiabatic,
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

Page1 / 2

example 4-2 - Example 4-2 Air with an initial temperature...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online