Department of Mechanical Science and Engineering
ME 300 Thermodynamics Section D Fall 2009
Homework #4 due Friday, September 25
th
Problem 4.1
Determine the specific volume of refrigerant134a vapor at 0.9 MPa and 70
◦
C based on:
(a) the idealgas equation
(b) the generalized compressibility chart
(c) data from tables.
(d) Determine the error involved for case (a) and (b) when compared to your answer from part (c).
Problem 4.2
Complete the following table by using the steam tables (Table A1 to A5)
T
p
h
x
Phase Description
◦
C
kPa
kJ/kg

(a)
200
0.7
(b)
140
1800
(c)
950
0
(d)
80
500
(e)
800
3162.2
Problem 4.3
(a) On the attached Pv diagram for R134a sketch the constant temperature process through the interme
diate state
p
i
=280kPa,
v
i
=0.06m
3
/kg as pressure changes from the initial state of
p
1
=400kPa to the final
state
p
2
=90kPa. Mark the three states on the diagram and use arrows to indicate the direction of the pro
cess. Determine the temperature of the process and label the isotherm (dotted line in diagram) accordingly.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 Staff
 Thermodynamics, Generalized compressibility chart, constant temperature process, initial Temperature T1, state p2 =90kPa, intermediate state pi

Click to edit the document details