EMCH 394, Soln-Quiz#1
Fall 2016
University of South Carolina
Time: 40 minutes
Name_
Row#_
Date: August 23, 2016
2. Steam enters a nozzle at 440oC and 1500 kPa with a velocity of 10 m/s and leaves at 300oC and 400 kPa while
losing heat at a rate of 40 kW.
Thermodynamic System Design and Analysis EMCH 394
Class problem 19-20-16!
The pressure and temperature at the beginning of compression of an air standard Diesel
cycle are 95 kPa and 300 K, respectively. At the end of the heat addition the pressure is
7.
Class Problem EMCH 394 date: 09/01/2016)
Name: Row:
m
2. A steam power plant operates on the reheat Rankine cycle. Steam enters the high-pressure
turbine at 12 MPa and 560C at a rate of 7.7 kg/s and leaves at 2 MPa. Steam is then
reheated at constant pres
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2. Figure below provides steady-state data for a throttling valve in series with a heat exchanger.
Saturated liquid Refrigerant 134a enters the valve at T1=36C with a mass ow rate of 0.26 kg/s
and is throttled to T
EMCH 394, Fall 2009
Test # 1
UNIVERSITY OF SOUTH CAROLINA
Wednesday, September 22, 2016
Name Row#
(ELEASE SHOW ALL YOUR WOEE)
1. Steam at 10 MPa and 480 C enters the rst stage of an ideal Rankine cycle with re-heat. Assume the rst stage turbine
is isentro
Thermodynamic System Design and Analysis EMCH 394
HW#5 (Due date: Thursday 10/06/2016)
Name: Row:
1. An air standard dual cycle has temperature and pressure at beginning of the compression
of 100 kPa and 310K respectively. The compression ratio is 15 an
Thermodynamic System Design and Analysis EMCH 394
HW#6 (Due date: Thursday10/20/2016)
Name:_Row:_
1. In a vapor compression refrigeration cycle, ammonia exits the evaporator at -150C and 200
kPa. The refrigerant enters the condenser at 16 bar and 160oC, a
Homework for Chapter 9.
Total 280 points. Due on Tuesday, April 7, 2015 at the beginning of the class.
1. (10 points) Describe qualitatively the microstructure development that will occur upon
slow cooling of a melt of equal parts (by weight) of copper an
Homework for Chapters 6. Total 160 points. Due on Thursday March 5 at the beginning of
the class. You must write down the equations and the detailed solving steps.
1. The following three - data points are provided for a titanium alloy for aerospace
applic
Homework for Chapter 3. Total 190 points. Due on Thursday, 2/12 at the beginning of the
lecture.
1. Why is there no base-centered cubic lattice in Table 3.2? (Use a sketch to answer). (10
points)
The base-centered cubic is equivalent to a simple tetragona
Homework for Chapters 7 and 8. Total 90 points. Due on Thursday 3/26 at the
beginning of the class. Please write down the equations and the detailed solving
steps.
1. (10 points) Given that molecular weight for aluminum (Al) and copper (Cu) is 26.98
g/mol
EMCH 371 Spring. Homework for Chapter 2.
10 points for each problem. Total 180 points. Due on Tuesday 1/27 at the beginning of the
class.
1. (total 20 points)
(a) Schematically plot the net bonding force and bonding energy curves versus interionic
separat
Homework assigned 9/25
9.25.1 A piston-cylinder filled with air is compressed from 10 psi, 40oF to a final volume
of 1 ft3 in a polytrophic process where n = 1.4. The mass of the air is 1lbm. Determine the
work and heat transfer using a) constant specific
Homework assigned 9/23
9.23.1
O2 at 20oC and 200 bar is to be stored in a rigid container. The capacity of the container is
0.04 m3. What is the mass O2 that can be stored in the container? A fusible plug is used to
prevent the pressure from exceeding the
Homework assigned 9/21
9.21.1
Argon at 200 bar is to be stored in a steel vessel at 20oC. The capacity of the vessel is
0.04 m3. Determine the mass of argon that can be stored in the vessel. The vessel is
protected against excessive pressure by a fusible
Homework assigned 9/18
9.18.1
What is the compressibility factor for each of the following?
Argon
30 atm
70oF
Ethane
10 atm
0oF
Methane
10 atm
70oF
R12
1 atm
0oF
Nitrogen
10 atm
170oF
9.18.2
Can the following be considered an ideal gas?
CO2
1 atm
70oF
H2
Homework assigned 9/16
9.16.1 H2O at P = 300 psia and T = 500oF is in a piston/cylinder device. Heat is transferred to the device
so that the volume is twice the initial volume while the pressure remains constant. (a) Sketch the process
on a P-v diagram,
Homework assigned 9/9
9.9.1 For each of the following determine if it is liquid, saturated vapor
Material
Temp. Press.
(F)
(PSI)
Water
Water
Water
Water
Water
Water
Water
Water
Water
350
350
350
350
Specific
Vol.
(ft3/lbm)
Int. Energy
(Btu/lbm)
X
Phase
(L
Assigned 9/4
9.4.1
Using Excel and the data in the charts in the back of the book plot temp (vertical axis) vs specific volume
(horizontal axis) for water at 10psi, 14.7 psia, and 100 psia, as the Temperature goes from 70 oF to
1,000oF. PUT ALL THREE CURV
Homework assigned 9/2
9.2.1 A heat engine is known to operate at 58.3% efficiency that rejecting 500 Btu/lbm of heat. What is
the work out of the engine?
Ans: 700 Btu/lbm
9.2.2 A heat pump has a COP of 2.9. Determine the heat (a) transferred to and (b) fr