ENSC 388
Assignment #7
Assignment date: Wednesday Nov. 04, 2009
Due date: Wednesday Nov. 11, 2009
Problem 1
A thin silicon chip and an 8-mm-thick aluminum substrate are separated by a 0.02mm thick epoxy joint. The chip and substrate are each 10 mm on a si

ENSC 388 Week #2, Tutorial #1 Dimensions and Units
Problem 1: Water flows through a pipe with diameter =2 in. If the average
velocity of water is 1 m/s, find mass flow rate of water in (lbm/s) and (kg/s).
d2
Consider density of water 62.1 lbm/ft and use m

ENSC 388 Week # 4, Tutorial # 3 Energy Analysis of Closed Systems
Problem 1: One-tenth of a kilogram of water at 3 bars and 76.3% quality is
contained in a rigid tank which is thermally insulated. A paddle-wheel inside
the tank is turned by an external mo

Solving Thermodynamics Problems
Solving thermodynamic problems can be made significantly easier by using the
following procedure:
1. Summarize given data in own words, leave out unneeded information
2. Clearly understand/identify what is being asked for d

ENSC 388 Quiz #2
Oct. 7, 2009
Name: Student ID:.
Time: 45 minutes or less. Develop answers on available place. The quiz has 5% (bonus) of
the total mark. Closed books & closed notes.
Problem 1 (50%):
A thin silicon chip and an 8-mm-thick aluminum substrat

SteadyHeatConduction
Inthermodynamics,weconsideredtheamountofheattransferasasystemundergoesa
process from one equilibrium state to another. Thermodynamics gives no indication of
howlongtheprocesstakes. Inheattransfer,wearemoreconcernedabouttherateof
heatt

Entropy
Thesecondlawleadstothedefinitionofanewpropertycalledentropy.
TheClausiusInequality
Thefirstlawissimplyanenergybalance.However,thesecondlawleadstoaninequality;
an irreversible process is less efficient than a reversible process. Another important
i

PropertiesofPureSubstances
PureSubstance
Asubstancethathasafixedchemicalcompositionthroughoutiscalledapuresubstance
suchaswater,air,andnitrogen.
Apuresubstancedoesnothavetobeofasingleelementorcompound.Amixtureoftwo
or more phases of a pure substance is st

TheFirstLawofThermodynamics:ControlVolumes
Herewewillextendtheconservationofenergytosystemsthatinvolvemassflowacross
theirboundaries,controlvolumes.
Any arbitrary region in space can be selected as control volume. There are no concrete
rules for the selec

NaturalConvection
Innaturalconvection,thefluidmotionoccursbynaturalmeanssuchasbuoyancy.Since
the fluid velocity associated with natural convection is relatively low, the heat transfer
coefficientencounteredinnaturalconvectionisalsolow.
MechanismsofNatural

TheFirstLawofThermodynamics:ClosedSystems
The first law of thermodynamics can be simply stated as follows: during an interaction
betweenasystemanditssurroundings,theamountofenergygainedbythesystemmust
beexactlyequaltotheamountofenergylostbythesurroundings

ENSC 388 Week # 3, Tutorial # 2 Properties of Pure Substances
Problem 1: A 0.5 m3 rigid vessel initially contains saturated liquid-vapor
mixture of water at 100C. The water is now heated until it reaches the
critical state. Determine the mass of the liqui

ENSC 388 Week # 5, Tutorial # 4Energy Analysis of Control Volumes
Problem 1: Consider the simple steam power plant, as shown in the figure.
The following data are for such a power plant.
Pressure
Temperature
or Quality
Leaving boiler
2.0 MPa
300C
Entering

ENSC 388
Assignment #9 (Local Heat Transfer Coefficient)
Assignment date: Wed Nov. 25, 2009
Due date: Wed Dec. 2, 2009
Problem 1
Explain under what conditions the total rate of heat transfer from an isothermal flat
plate of dimensions L by 2L would be the

ENSC 388
Assignment #8
Assignment date: Wednesday Nov. 11, 2009
Due date: Wednesday Nov. 18, 2009
Problem 1
A 3-mm-thick panel of aluminum alloy (k = 177 W/mK, c = 875 J/kgK, and =
2770 kg/m) is finished on both sides with an epoxy coating that must be cu

ENSC 388
Assignment #4
Assignment date: Wednesday Oct. 7, 2009
Due date: Thursday Oct. 14, 2009
Problem 1
Water flows into the top of an open barrel at a constant mass flow rate of .
Water exits through a pipe near the base with a mass flow rate proportio

ENSC 388
Assignment #1 (Basic Concepts)
Assignment date: Wednesday Sept. 16, 2009
Due date: Wednesday Sept. 23, 2009
Problem 1: (Static Pressure)
Both a gage and a manometer are attached to a gas tank to measure its pressure. If
the reading on the pressur

ENSC 388
Assignment #2 (Properties of Pure Substances)
Assignment date: Wed Sept. 23, 2009
Due date: Wed Sep. 30, 2009
Problem 1
Water at the critical condition is contained in a rigid container. The system is
cooled down until its temperature reaches
25

ENSC 388
Assignment #3
Assignment date: Wednesday Sept. 30, 2009
Due date: Wednesday Oct. 7, 2009
Problem 1
A
cylinder
fitted
with
a
piston
contains
propane
370 ,
4.26
,
0.1885 / .
gas at 100
and 300 , where the total volume of the system is 200 . The gas

ENSC 388
Assignment #5
Assignment date: Wednesday Oct. 14, 2009
Due date: Wednesday Oct. 21, 2009
Problem 1
A completely reversible heat pump produces heat at a rate of 100
to warm a
house maintained at 21 . The exterior air, which is at 10 , serves as th

ENSC 388
Assignment #6
Assignment date: Wednesday Oct. 21, 2009
Due date: Wednesday Oct. 28, 2009
Problem 1
A turbine operating at steady state receives air at a pressure of
3.0
and a
temperature of
390 . Air exits the turbine at a pressure of
1.0
.
The w

ENSC 388 Week # 10, Tutorial # 9Heat Transfer Coefficient
Problem 1: Air flows over the top and bottom surfaces of a thin, square
plate. The flow regime and the total heat transfer rate are to be determined
and the average gradients of the velocity and te

ENSC 388 Week #10, Tutorial #8 Transient Conduction
Problem
A new process for treatment of a special material is to be evaluated. The material, a sphere of radius
5
, is initially in equilibrium at 400C in a furnace. It is suddenly removed from the furnac

ENSC 388 Week # 6, Tutorial # 5 The Second Law of
Thermodynamics
Problem 1: Cold water at 10C enters a water heater at the rate of 0.02
m3/min and leaves the water heater at 50C. The water heater receives hest
from a heat source at 0C.
a) Assuming the wat

ENSC 388 Week # 7, Tutorial #6 Entropy
Problem 1: Steam enters a turbine with a pressure of 30 bar, a temperature
of 400C, and a velocity of 160 m/s. Saturated vapor at 100C exits with a
velocity of 100 m/s. At steady state, the turbine develops work equa

ENSC 388 Week #9, Tutorial #7 Steady State Conduction
Problem 1:
A leading manufacturer of household appliances is proposing a self-cleaning oven design
that involves use of a composite window separating the oven cavity from the room air.
The composite is

ENSC 388
ENGINEERING THERMODYNAMICS AND HEAT TRANSFER
Fall 2011
Instructor: Dr. Majid Bahrami
T.A.s
Mehran Ahmadi
Hamidreza Sadeghifar
4164
4300
4300
Email: mbahrami@sfu.ca
Email: mahmadi@sfu.ca
Email: sadeghif@sfu.ca
Course objective:
This is an introduc