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Unformatted text preview: Stevens Institute of Technology
E234 - Thermodynamics
Sections A and B : Tuesday, October 6, 2009
Section C: Thursday, October 8, 2009
There will be a quiz at the end of the recitation.
You should be able to:
a) Define the first law of thermodynamics, internal energy, heat, work
b) Determine various forms of work such as electrical, boundary, shaft and spring
c) Define triple point, saturation curve, superheated vapor, saturated liquid, vapor
and solid, compressed liquid
d) Draw T-v and P-v curves at various pressures
e) Draw P-T diagram
Reading and Study Assignment:
1. Chapter 2
2. Lecture notes – Module 2
3. Chapter 3 to Section 3-4 inclusive
4. Module 3 to slide 20
Dry ice is the name of solid carbon dioxide. How cold must it be at
atmospheric (100 kPa) pressure? If it is heated at 100 kPa what eventually
How accurate is it to assume propane is an ideal gas at room conditions?
(Critical properties are listed inTable A-1); How about hydrogen? How about water?
Please explain your reasoning carefully.
??? Calculate the ideal gas constant for argon and hydrogen
Table A-2 Rg = Ru/M
Modern extraction techniques can be based on dissolving material in
supercritical fluids such as ethyl alcohol. How high are pressure and density of ethyl
alcohol when the pressure and temperature are around the critical point.
You may need to get the P-T diagram for CO2
FALL 08 Fall 2009 Modern extraction techniques can be based on dissolving material in supercritical
fluids such as carbon dioxide (e.g. caffeine in making decaf). How high are pressure
and density of carbon dioxide when the pressure and temperature are around the
critical point. Repeat for methyl alcohol.
Table A.1: Pc = 7.39 MPa, Tc = 304.2 K, vc = 0.0943 m3/kmol
ρc = 1/vc = 1/0.00212 = 472 kg/m3 CH3OH:
Table A.1: Pc = 7.95 MPa, Tc = 513.2 K, vc = 0.1180 m3/kmol
ρc = 1/vc = 1/0.00363 = 275 kg/m3 4.
Determine whether water at each of the following states is a compressed
liquid, a superheated vapor, or a mixture of saturated liquid and vapor (Tables A-4 to
a. P = 20 MPa, v = 0.003 m3/kg
b. 1 MPa, 190°C
c. 200°C, 0.1 m3/kg
d. 10 kPa, 10°C
Determine whether water at each of the following states is a compressed liquid,
a superheated vapor, or a mixture of saturated liquid and vapor.
a. P = 50 MPa, v = 0.003 m3/kg
Pressure is above critical pressure; Table A-6 superheated around 455 oC
b. 1 MPa, 180°C
Table A-4, at 180 °C, Psat = 1002.8 kPa, P >Psat compressed liquid
c. 200°C, 0.102 m3/kg
Table A-4, at 200°C, 0.001157< v < 0.12721 saturated mixture
d. 15 kPa, 10°C
Table A-4, at 10 °C, Psat = 1.2281 kPa, P > Psat compressed liquid Fall 2009 ...
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- Spring '09