Lect 3 Thermo I – Concepts & Pure Substance Propertiesusers.rowan.edu/~merrill/Lect3_4s.pdf ·...
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9/16/2009 1 Lect 3 Thermo I – Concepts & Pure Substance Properties 1. Able to describe what Energy is to a RU freshmen and describe three primary forms of energy, from a molec. level. 2. Able to describe what the temperature equality and zeroth law mean 3 Able to describe various temperature scales Temperature 1 3. Able to describe various temperature scales Temperature Scale 4. Able to explain the temperature and volume behavior of a pure substance under constant pressure. 5. Able to interpret the various phase regions on a phase diagram 6. Able to explain and calculate quality Mind Map 2
Transcript of Lect 3 Thermo I – Concepts & Pure Substance Propertiesusers.rowan.edu/~merrill/Lect3_4s.pdf ·...
9/16/2009
1
Lect 3 Thermo I – Concepts & Pure Substance Properties
1. Able to describe what Energy is to a RU freshmen and describe three primary forms of energy, from a molec. level.
2. Able to describe what the temperature equality and zerothlaw mean
3 Able to describe various temperature scales Temperature
1
3. Able to describe various temperature scales Temperature Scale
4. Able to explain the temperature and volume behavior of a pure substance under constant pressure.
5. Able to interpret the various phase regions on a phase diagram
6. Able to explain and calculate quality
Mind Map
2
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Thermal Equilibrium - Simple
3
http://http://jersey.uoregon.edu/vlab/Thermodynamics/index.html
Thermal Equilibrium - Real
4http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/temper.html#c1
Sidebar – the meaning of temperature
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Motivation for Property Understanding Design
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Pure Substance P vs. T phase diagram
?
03_02 6
?
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Constant Pressure ( Isobaric) Heat Transfer Process
03_01
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Constant Pressure
Phase Diagram – Fig 3.3 & Back to Isobaric Process
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Lect 4 Pure Substance Properties
1. Able to explain the significance of "independent" properties for pure substances.
2. Able to use Appendix B to calculate pure substance properties.
3 Abl EES l l b i
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3. Able to use EES calculate pure substance properties.
Mind Map
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Motivation: Properties Component Design
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Constant Pressure
Temperature vs. Volume: Isobaric Process
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Temperature vs. Volume: Isobaric Process
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Quality….and I’m not talking about workmanship
03_0414
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Simple Process - Isochoric
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Quality
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vapor vapor
liquid vapor mix
m mx
m m m= =
+
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Water Phase Diagram
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Pressure – Temperature Diagram: Water
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5kPa
0.01C
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Carbon dioxide
03_06 19
Critical Points of Various Materials
03_01tbl
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Triple Points of Various Materials
03_02tbl21
Property Finding Options
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Property Sources - Tables
03_08
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Example 3.1 Water – Using Table B.1.1
a. 120 C, 500 kPa b. 120 C and 0.5 m^3/kg
Find phase and place on P-v, T-v, and P-T
P vs. T P vs. v T vs. vT vs. v
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_
T[C]
P[kPa]
vf[m^3/kg]
vfg vg uf
[kJ/kg]ufg ug
120 198.5 1.06e-3 0.8908 0.8919 503.48 2025.7 2529.2
corrected.
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Example 3.2a Amonia – Appendix B
a. Ammonia, 30 C, 1000 kPa
Find phase and place on P-v, T-v, and P-T
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T[C]
P[kPa]
vf[m^3/kg]
vfg vg uf
[kJ/kg]ufg ug
30 1167 1.68e-3 0.1088 0.1104 320.46 1016.9 1337.4
Liner Interpolation Example 3.3 – Superheated Vapor Temperature
379.8 C
03_1426
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Propane Compressibility, Ex. 3.13
03_23
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Water & I.G. Errors
03_21 28
