EGR 334 Thermodynamics: Homework 11
Problem 3: 138
Two tenths kmol of nitrogen in a piston cylinder assembly undergoes two processes in series as follows:
Process 1-2: Constant pressure at 5 bar from V1 = 1.33 m3 to V2= 1 m3.
Process 2-3: Constant volume

EGR 334
HW Set 27
Spring 2012
Problem 6: 114
Air as an ideal gas flows through the compressor and heat exchanger shown. A separate liquid
water stream flows through the heat exchanger. The data given are for operation at steady state.
Stray heat transfer

The First Law of
Thermodynamics
Closed System
1
So far
Weve
considered various forms of energy
Q (heat)
W (work)
E (Energy)
We
havent tried to relate them during a
process
They are related through the
FIRST LOW OF THERMODYNAMICS
(CONSEVATION OF ENERG

EGR 334 Thermodynamics: Homework 12
Problem 4: 1
An 8 cu ft tank contains air at an initial temperature of 80 deg F and initial pressure of 100 psi. The tank develops a
small hole and air leaks from the tank at a constant rate of 0.03 lb/s for 90 s until

EGR 334 Thermodynamics: Homework 07
Problem 3: 35
From an initial state where the pressure is p1, the temperature is T1 and the volume is V1, water vapor contained in a
piston cylinder assembly undergoes each of the following processes:
1-2: Constant temp

EGR 334 Thermodynamics: Homework 06
Prob 3: 5
Determine the phase of phases in a system consisting of H2O at the following conditions and sketch p-v and T-v
diagrams showing the location of each state.
a) p = 80 psi
T = 312.07 deg F.
b) p = 80 psi
T = 400

EGR 334 Thermodynamics: Homework 05
Chap 2: 46
A composite plan wall consists of 12 in thick layer of insulating concrete block (K c= 0.27 Btu/hr-ft-oR) and a 0.625
in thick layer of gypsum board (Kb = 1.11 Btu/hr-ft-oR) the outer surface temperature of t

EGR 334 Thermodynamics: Homework 04
Chap 2: 73
Figure P2.73 show a power cycle executed by a gas in a piston cylinder assembly. For process 1-2, U2 - U1 = 15 kJ.
For process 3-1, Q31 = 10 kJ. There are no changes in kinetic or potential energy. Determine

EGR 334 Thermodynamics: Homework 03
Chap 2: 49
Complete the following exercises using the heat transfer relations:
a) Referring to Fig 2.13, determine the net rate of radiant exchange in W, for =0.8, A = .125 m2 , Tb = 475 K, and
Ts = 298 K.
b) Referring

EGR 334 Thermodynamics
Chap 2: 6
Homework: 02
An object of mass 1000 kg, initial having a velocity of 100 m/s decelerates to a final velocity of 20 m/s. What is the
change in kinetic energy of the objet in kJ?
-Solution:
EGR 334 Thermodynamics
Homework: 0

EGR 334 Thermodynamics
Homework: 01
Chap 1: 19
A town has a 1-million gallon storage capacity water tower. If the density of water is 62.4 lb/ft 3, and local
acceleration of gravity is 32.1 ft/s2, what is the force in lbf, the structural base must provide

EGR 334 Thermodynamics: Homework 10
Problem 3: 102
Check the applicability of the ideal gas model
a) for water at 700 deg F and pressures of 1600 psi and 160 psi
b) for carbon dioxide at 865 K and pressures of 75 bar and 3 bar.
-a) Water at :
p = 1600 psi

EGR 334 Thermodynamics: Homework 09
Problem 3: 92
Determine the volume in m3 occupied by 20 kg of hydrogen at 1170 kPa, and -220 deg C.
-m= 20 kg
p = 1170 kPa = 11.70 bar
T = -220 deg C. = 53 K.
for hydrogen: R=4.1240 kJ/kg-K
Rbar = 8.314 kJ/kmol-K
M=2.01

EGR 334 Thermodynamics: Homework 16
Problem 4:36
Methane (CH4) gas enters a horizontal well insulated nozzle operating at steady state at 80 deg. C and a velocity of
10 m/s. Assuming ideal gas behavior for the methane, plot the temperature of the gas exit

EGR 334 Thermodynamics: Homework 17
Problem 4:75
An air conditioning system in which air flows over tubes carrying R134a. Air enters with a volumetric flow rate of
50 m3/min at 32 deg C, 1 bar and exits at 22 deg C , 0.95 bar. Refrigerant enters the tubes

EGR 334 Thermodynamics: Homework 18
Problem 4: 95
A turbine operating at a steady state that provides power to an air compressor and an electric generator. Air enters
the turbine with a mass flow rate of 5.4 kg/s at 527 deg C and exits the turbine at 107

Energy Transfer
by Heat, Work
and Mass
1
Objectives
. Introduce the concept of energy transfer by heat
Discuss the various forms of work with emphasis on the moving
.boundary work
Discuss the flow work, the work associated with forcing a fluid into or

EGR 334
HW Set 26
Spring 2012
Problem 6: 80
A gas flows through a 1-inlet, 1-outlet control volume operating at steady state. Heat transfer at
the rate Qdotcv takes place only at a location on the boundary where the temperature is Tb. For
each of the foll

The
Ideal Gas
1
Ideal gas equation of state
Property tables provide very accurate information about the
properties.
It is desirable to have simple relations among the properties that are
sufficiently general and accurate.
Any equation that relates P-v-T a

EGR 334
HW Set 25
Spring 2012
Problem 6: 36
A closed system undergoes a process in which work is done on the system and the heat transfer
Q occurs only at temperature Tb. For each case, determine whether the entropy change of the
system is positive, negat

Ch# 2 Properties of
Pure Substances
Pure
Objectives
Objectives
Introduce the concept of a pure substance.
Discuss the physics of phase-change processes.
Discuss
Illustrate the P-v, T-v, and P-T property diagrams and P-v-T surfaces of
Illustrate
and
pure

EGR 334
HW Set 24
Spring 2012
Problem 6: 1
Using the table for water, determine the specific entropy at the indicated states in kJ/kg-K. In
each case, locate the state by hand on a sketch of the T-s diagram.
a) p = 5.0 MPa T =400 deg C.
b) p = 5.0 MPa T =

King Fahd University of Petroleum &
Minerals
Minerals
Mechanical Engineering
Thermodynamics ME 203
BY
Dr. Salem Al-Dini
Mission statements of the department
Mission
The department is committed to
The
providing highest quality education in mechanical
prov

EGR 334
HW Set 22
Spring 2012
Problem 5: 64
By removing energy by heat transfer from a room, a window air conditioner maintains the room
at 22 deg C on a day when the outside temperature is 32 deg C.
a) Determine in kW per kW of cooling the minimum theore

EGR 334
HW Set 21
Spring 2012
Problem 5: 20
As shown, a reversible power cycle receives energy Qh by heat transfer from a hot reservoir at Th
and rejects energy Qc by heat transfer to a cold reservoir at Tc.
a) if Th = 1200 K and Tc = 300 K, what is the t

EGR 334 Thermodynamics: Homework 19
Problem 4: 94
For review complete the following: Answer True or false and explain.
-a i) For a one-inlet, one-exit CV at SS, the mass flow rates at the inlet and exit are equal, but the inlet and exit
volumetric flow ra

EGR 334 Thermodynamics: Homework 08
Problem 3: 49
A closed rigid tank is filled with water. Initially the tank hold 9.9 ft3 saturated vapor and 0.1 cu. ft saturated liquid,
each at 212 deg F. The water is heated until the tank contains only saturated vapo