Solution Manual For Heat And Mass Transfer: Fundamentals And Applications, 5th Edition

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1-1
Solutions Manual
for
Heat and Mass Transfer: Fundamentals & Applications
5th Edition
Yunus A. Cengel & Afshin J. Ghajar
Chapter 1
INTRODUCTION AND BASIC CONCEPTS

1-2
Thermodynamics and Heat Transfer
1-1C Thermodynamics deals with the amount of heat transfer as a system undergoes a process from one equilibrium state to
another. Heat transfer, on the other hand, deals with the rate of heat transfer as well as the temperature distribution within the
system at a specified time.
1-2C (a) The driving force for heat transfer is the temperature difference. (b) The driving force for electric current flow is the
electric potential difference (voltage). (a) The driving force for fluid flow is the pressure difference.
1-3C The caloric theory is based on the assumption that heat is a fluid-like substance called the "caloric" which is a massless,
colorless, odorless substance. It was abandoned in the middle of the nineteenth century after it was shown that there is no
such thing as the caloric.
1-4C The rating problems deal with the determination of the heat transfer rate for an existing system at a specified
temperature difference. The sizing problems deal with the determination of the size of a system in order to transfer heat at a
specified rate for a specified temperature difference.
1-5C The experimental approach (testing and taking measurements) has the advantage of dealing with the actual physical
system, and getting a physical value within the limits of experimental error. However, this approach is expensive, time
consuming, and often impractical. The analytical approach (analysis or calculations) has the advantage that it is fast and
inexpensive, but the results obtained are subject to the accuracy of the assumptions and idealizations made in the analysis.
1-6C The description of most scientific problems involves equations that relate the changes in some key variables to each
other, and the smaller the increment chosen in the changing variables, the more accurate the description. In the limiting case
of infinitesimal changes in variables, we obtain differential equations, which provide precise mathematical formulations for
the physical principles and laws by representing the rates of changes as derivatives.
As we shall see in later chapters, the differential equations of fluid mechanics are known, but very difficult to solve
except for very simple geometries. Computers are extremely helpful in this area.
1-7C Modeling makes it possible to predict the course of an event before it actually occurs, or to study various aspects of an
event mathematically without actually running expensive and time-consuming experiments. When preparing a mathematical
model, all the variables that affect the phenomena are identified, reasonable assumptions and approximations are made, and
the interdependence of these variables are studied. The relevant physical laws and principles are invoked, and the problem is
formulated mathematically. Finally, the problem is solved using an appropriate approach, and the results are interpreted.

1-3
1-8C The right choice between a crude and complex model is usually the simplest model which yields adequate results.
Preparing very accurate but complex models is not necessarily a better choice since such models are not much use to
an analyst if they are very difficult and time consuming to solve. At the minimum, the model should reflect the essential
features of the physical problem it represents.
1-9C Warmer. Because energy is added to the room air in the form of electrical work.
1-10C Warmer. If we take the room that contains the refrigerator as our system, we will see that electrical work is supplied to
this room to run the refrigerator, which is eventually dissipated to the room as waste heat.
1-11C For the constant pressure case. This is because the heat transfer to an ideal gas is mcpT at constant pressure and
mcvT at constant volume, and cp is always greater than cv.
1-12C Thermal energy is the sensible and latent forms of internal energy, and it is referred to as heat in daily life.
1-13C The rate of heat transfer per unit surface area is called heat fluxq . It is related to the rate of heat transfer by A
dAqQ 
.
1-14C Energy can be transferred by heat, work, and mass. An energy transfer is heat transfer when its driving force is
temperature difference.

1-4
1-15 The filament of a 150 W incandescent lamp is 5 cm long and has a diameter of 0.5 mm. The heat flux on the surface of
the filament, the heat flux on the surface of the glass bulb, and the annual electricity cost of the bulb are to be determined.
Assumptions Heat transfer from the surface of the filament and the bulb of the lamp is uniform.
Analysis (a) The heat transfer surface area and the heat flux on the surface of the filament are2
cm785.0)cm5)(cm05.0( 

DLAs26 W/m101.91 2
2 W/cm191
cm785.0
W150
s
s A
Q
q 

(b) The heat flux on the surface of glass bulb is222 cm1.201cm)8( 

DAs2
W/m7500 2
2 W/cm75.0
cm1.201
W150
s
s A
Q
q 

(c) The amount and cost of electrical energy consumed during a one-year period is$35.04/yr

kWh)/.08kWh/yr)($0(438=CostAnnual
kWh/yr438h/yr)8kW)(36515.0(nConsumptioyElectricit tQ
1-16E A logic chip in a computer dissipates 3 W of power. The amount heat dissipated in 8 h and the heat flux on the surface
of the chip are to be determined.
Assumptions Heat transfer from the surface is uniform.
Analysis (a) The amount of heat the chip dissipates during an 8-hour period iskWh0.024 Wh24)h8)(W3(tQQ 
(b) The heat flux on the surface of the chip is2
W/in37.5 2
in08.0
W3
A
Q
q 

Logic chipW3QQ
Lamp
150 W

1-5
1-17 An aluminum ball is to be heated from 80C to 200C. The amount of heat that needs to be transferred to the aluminum
ball is to be determined.
Assumptions The properties of the aluminum ball are constant.
Properties The average density and specific heat of aluminum are given to be
 = 2700 kg/m3 and cp = 0.90 kJ/kgC.
Analysis The amount of energy added to the ball is simply the change in its internal energy, and is
determined from)( 12transfer TTmcUE p 
wherekg77.4m)15.0)(kg/m2700(
66
333 


 Dm
V
Substituting,kJ515=C80)C)(200kJ/kgkg)(0.9077.4(transfer E
Therefore, 515 kJ of energy (heat or work such as electrical energy) needs to be transferred to the aluminum ball to heat it to
200C.
1-18 One metric ton of liquid ammonia in a rigid tank is exposed to the sun. The initial temperature is 4°C and the exposure
to sun increased the temperature by 2°C. Heat energy added to the liquid ammonia is to be determined.
Assumptions The specific heat of the liquid ammonia is constant.
Properties The average specific heat of liquid ammonia at (4 + 6)°C / 2 = 5°C is cp = 4645 J/kgK (Table A-11).
Analysis The amount of energy added to the ball is simply the change in its internal energy, and is
determined from)( 12 TTmcQ p 
wherekg1000tonmetric1m 
Substituting,kJ9290=C)C)(2J/kgkg)(46451000( Q
Discussion Therefore, 9290 kJ of heat energy is required to transfer to 1 metric ton of liquid ammonia to heat it by 2°C. Also,
the specific heat units J/kgºC and J/kgK are equivalent, and can be interchanged.
Metal
ball
E

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1-6
1-19 A 2 mm thick by 3 cm wide AISI 1010 carbon steel strip is cooled in a chamber from 527 to 127°C. The heat rate
removed from the steel strip is 100 kW and the speed it is being conveyed in the chamber is to be determined.
Assumptions 1 Steady operating conditions exist. 2 The stainless steel sheet has constant properties. 3 Changes in potential
and kinetic energy are negligible.
Properties For AISI 1010 steel, the specific heat of AISI 1010 steel at (527 + 127)°C / 2 = 327°C = 600 K is 685 J/kg∙K
(Table A-3), and the density is given as 7832 kg/m3.
Analysis The mass of the steel strip being conveyed enters and exits the chamber at a rate ofVwtm

The rate of heat loss from the steel strip in the chamber is given as)()( outinoutinloss TTVwtcTTcmQ pp 

Thus, the velocity of the steel strip being conveyed ism/s0.777




 K)127527(K)J/kg685)(m002.0)(m030.0)(kg/m7832(
W10100
)( 3
3
outin
loss
TTwtc
Q
V
p


Discussion A control volume is applied on the steel strip being conveyed in and out of the chamber.
1-20E A water heater is initially filled with water at 50F. The amount of energy that needs to be transferred to the water to
raise its temperature to 120F is to be determined.
Assumptions 1 Water is an incompressible substance with constant specific. 2 No water flows in or out of the tank during
heating.
Properties The density and specific heat of water at 85ºF from Table A-9E are:  =
62.17 lbm/ft3 and cp = 0.999 Btu/lbm
R.
Analysis The mass of water in the tank islbm7.498
gal7.48
ft1
gal))(60lbm/ft17.62(
3
3 









Vm
Then, the amount of heat that must be transferred to the water in the tank as it is
heated from 50 to 120F is determined to beBtu34,874 F)50F)(120Btu/lbmlbm)(0.9997.498()( 12 TTmcQ p
Discussion Referring to Table A-9E the density and specific heat of water at 50ºF are:  = 62.41 lbm/ft3 and cp = 1.000
Btu/lbmR and at 120ºF are:  = 61.71 lbm/ft3 and cp = 0.999 Btu/lbmR. We evaluated the water properties at an average
temperature of 85ºF. However, we could have assumed constant properties and evaluated properties at the initial temperature
of 50ºF or final temperature of 120ºF without loss of accuracy.
120F
50F
Water

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1-7
1-21 A house is heated from 10C to 22C by an electric heater, and some air escapes through the cracks as the heated air in
the house expands at constant pressure. The amount of heat transfer to the air and its cost are to be determined.
Assumptions 1 Air as an ideal gas with a constant specific heats at room temperature. 2 The volume occupied by the furniture
and other belongings is negligible. 3 The pressure in the house remains constant at all times. 4 Heat loss from the house to the
outdoors is negligible during heating. 5 The air leaks out at 22C.
Properties The specific heat of air at room temperature is cp = 1.007 kJ/kg
C.
Analysis The volume and mass of the air in the house are32 m600m))(3m200(ght)space)(heifloor( 
Vkg9.747
K)273.15+K)(10/kgmkPa287.0(
)mkPa)(6003.101(
3
3


 RT
P
m
V
Noting that the pressure in the house remains constant during heating, the amount of heat
that must be transferred to the air in the house as it is heated from 10 to 22C is
determined to bekJ9038 C)10C)(22kJ/kgkg)(1.0079.747()( 12 TTmcQ p
Noting that 1 kWh = 3600 kJ, the cost of this electrical energy at a unit cost of $0.075/kWh is$0.19 5/kWh)kWh)($0.073600/9038(energy)ofcostused)(Unit(Energy=CostEnegy
Therefore, it will cost the homeowner about 19 cents to raise the temperature in his house from 10 to 22C.
22C
10C
AIR

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1-8
1-22 An electrically heated house maintained at 22°C experiences infiltration losses at a rate of 0.7 ACH. The amount of
energy loss from the house due to infiltration per day and its cost are to be determined.
Assumptions 1 Air as an ideal gas with a constant specific heats at room temperature. 2 The volume occupied by the furniture
and other belongings is negligible. 3 The house is maintained at a constant temperature and pressure at all times. 4 The
infiltrating air exfiltrates at the indoors temperature of 22°C.
Properties The specific heat of air at room temperature is cp = 1.007 kJ/kg
C.
Analysis The volume of the air in the house is32 m450m))(3m150(ght)space)(heifloor( 
V
Noting that the infiltration rate is 0.7 ACH (air changes per hour) and thus the air in
the house is completely replaced by the outdoor air 0.724 = 16.8 times per day, the
mass flow rate of air through the house due to infiltration iskg/day8485
K)273.15+K)(5/kgmkPa287.0(
day)/m045kPa)(16.86.89(
)ACH(
3
3
houseair
air






o
o
o
o
RT
P
RT
P
m
V
V

Noting that outdoor air enters at 5C and leaves at 22C, the energy loss of this house per day iskWh/day40.4=kJ/day260,145C)5C)(22kJ/kg.007kg/day)(1.8485(
)( outdoorsindoorsairinfilt

 TTcmQ p
At a unit cost of $0.082/kWh, the cost of this electrical energy lost by infiltration is$3.31/day 0.082/kWh)kWh/day)($4.40(energy)ofcostused)(Unit(Energy=CostEnegy
1-23 Water is heated in an insulated tube by an electric resistance heater. The mass flow rate of water through the heater is to
be determined.
Assumptions 1 Water is an incompressible substance with a constant specific heat. 2 The kinetic and potential energy changes
are negligible, ke  pe  0. 3 Heat loss from the insulated tube is negligible.
Properties The specific heat of water at room temperature is cp = 4.18 kJ/kg·C.
Analysis We take the tube as the system. This is a control volume since mass crosses the system boundary during the process.
We observe that this is a steady-flow process since there is no change with time at any point and thus0and0 CVCV  Em
, there is only one inlet and one exit and thusmmm   21 , and the tube is insulated. The energy
balance for this steady-flow system can be expressed in the rate form as)(
0)peke(since
0
12ine,
21ine,
energiesetc.potential, kinetic,internal,inchangeofRate
(steady)0
system
massandwork,heat,by
nsferenergy tranetofRate
TTcmW
hmhmW
EEEEE
p
outinoutin






  
  
Thus,kg/s0.0266



 C)1506)(CkJ/kg4.18(
kJ/s5
)( 12
e,in
TTc
W
m
p


5C
0.7 ACH 22C
AIR
15C 60C
5 kW
WATER

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1-9
1-24 Liquid ethanol is being transported in a pipe where heat is added to the liquid. The volume flow rate that is
necessary to keep the ethanol temperature below its flashpoint is to be determined.
Assumptions 1 Steady operating conditions exist. 2 The specific heat and density of ethanol are constant.
Properties The specific heat and density of ethanol are given as 2.44 kJ/kg∙K and 789 kg/m3, respectively.
Analysis The rate of heat added to the ethanol being transported in the pipe is)( inout TTcmQ p  
or)( inout TTcQ p 
V
For the ethanol in the pipe to be below its flashpoint, it is necessary to keep Tout below 16.6°C. Thus, the volume flow rate
should beK)106.16)(KkJ/kg44.2)(kg/m789(
kJ/s20
)( 3
inout 


 TTc
Q
p



V/sm0.00157 3

V
Discussion To maintain the ethanol in the pipe well below its flashpoint, it is more desirable to have a much higher flow rate
than 0.00157 m3/s.

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1-10
1-25 A 2 mm thick by 3 cm wide AISI 1010 carbon steel strip is cooled in a chamber from 597 to 47°C to avoid
instantaneous thermal burn upon contact with skin tissue. The amount of heat rate to be removed from the steel strip is to be
determined.
Assumptions 1 Steady operating conditions exist. 2 The stainless steel sheet has constant specific heat and density. 3 Changes
in potential and kinetic energy are negligible.
Properties For AISI 1010 carbon steel, the specific heat of AISI 1010 steel at (597 + 47)°C / 2 = 322°C = 595 K is
682 J/kg∙K (by interpolation from Table A-3), and the density is given as 7832 kg/m3.
Analysis The mass of the steel strip being conveyed enters and exits the chamber at a rate ofVwtm

The rate of heat being removed from the steel strip in the chamber is given askW176



K)47597(K)J/kg682)(m002.0)(m030.0)(m/s1)(kg/m7832(
)(
)(
3
outin
outinremoved
TTVwtc
TTcmQ
p
p


Discussion By slowing down the conveyance speed of the steel strip would reduce the amount of heat rate needed to be
removed from the steel strip in the cooling chamber. Since slowing the conveyance speed allows more time for the steel strip
to cool.

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1-11
1-26 Liquid water is to be heated in an electric teapot. The heating time is to be determined.
Assumptions 1 Heat loss from the teapot is negligible. 2 Constant properties can be used for both the teapot and the water.
Properties The average specific heats are given to be 0.7 kJ/kg·K for the teapot and 4.18 kJ/kg·K for water.
Analysis We take the teapot and the water in it as the system, which is a closed system (fixed mass). The energy balance in
this case can be expressed asteapotwatersystemin
energiesetc.potential,
kinetic,internal,inChange
system
massandwork,heat,by
nsferenergy traNet
UUUE
EEE outin

 
Then the amount of energy needed to raise the temperature of
water and the teapot from 15°C to 95°C iskJ3.429
C)15C)(95kJ/kgkg)(0.7(0.5C)15C)(95kJ/kgkg)(4.18(1.2
)()( teapotwaterin


 TmcTmcE
The 1200-W electric heating unit will supply energy at a rate of 1.2 kW or 1.2 kJ per second. Therefore, the time needed for
this heater to supply 429.3 kJ of heat is determined frommin6.0 s358
kJ/s2.1
kJ3.429
nsferenergy traofRate
nsferredenergy traTotal
transfer
in
E
E
t 
Discussion In reality, it will take more than 6 minutes to accomplish this heating process since some heat loss is inevitable
during heating. Also, the specific heat units kJ/kg · °C and kJ/kg · K are equivalent, and can be interchanged.
1-27 It is observed that the air temperature in a room heated by electric baseboard heaters remains constant even though the
heater operates continuously when the heat losses from the room amount to 9000 kJ/h. The power rating of the heater is to be
determined.
Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -
141C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, ke  pe  0. 3 The temperature of the
room remains constant during this process.
Analysis We take the room as the system. The energy balance in this case reduces tooutine
outine
outin
QW
UQW
EEE



,
,
energiesetc.potential, kinetic,internal,inChange
system
massandwork,heat,by nsferenergy traNet
0

since U = mc
vT = 0 for isothermal processes of ideal gases. Thus,kW2.5





 kJ/h3600
kW1
kJ/h0009, outine QW 
AIR
We

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1-12
1-28 The resistance heating element of an electrically heated house is placed in a duct. The air is moved by a fan, and heat is
lost through the walls of the duct. The power rating of the electric resistance heater is to be determined.
Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -
141C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, ke  pe  0. 3 Constant specific heats at
room temperature can be used for air. This assumption results in negligible error in heating and air-conditioning applications.
Properties The specific heat of air at room temperature is cp = 1.007 kJ/kg·C (Table A-15).
Analysis We take the heating duct as the system. This is a control volume since mass crosses the system boundary during the
process. We observe that this is a steady-flow process since there is no change with time at any point and thus0and0 CVCV  Em
. Also, there is only one inlet and one exit and thusmmm   21 . The energy balance for this
steady-flow system can be expressed in the rate form as)(
0)peke(since
0
12infan,outine,
2out1infan,ine,
energiesetc.potential, kinetic,internal,inchangeofRate
(steady)0
system
massandwork,heat,by
nsferenergy tranetofRate
TTcmWQW
hmQhmWW
EEEEE
p
outinoutin






  
  
Substituting, the power rating of the heating element is determined to bekW2.97
 C)C)(5kJ/kg7kg/s)(1.00(0.6+kW)3.0()kW25.0(ine,W
We
300 W
250 W

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1-13
1-29 A room is heated by an electrical resistance heater placed in a short duct in the room in 15 min while the room is losing
heat to the outside, and a 300-W fan circulates the air steadily through the heater duct. The power rating of the electric heater
and the temperature rise of air in the duct are to be determined.
Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -
141C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, ke  pe  0. 3 Constant specific heats at
room temperature can be used for air. This assumption results in negligible error in heating and air-conditioning applications.
3 Heat loss from the duct is negligible. 4 The house is air-tight and thus no air is leaking in or out of the room.
Properties The gas constant of air is R = 0.287 kPa.m3/kg.K (Table A-1). Also, cp = 1.007 kJ/kg·K for air at room
temperature (Table A-15) and c
v = cp – R = 0.720 kJ/kg·K.
Analysis (a) We first take the air in the room as the system. This is a constant volume closed system since no mass crosses the
system boundary. The energy balance for the room can be expressed as)()()( 1212outinfan,ine,
outinfan,ine,
energiesetc.potential,
kinetic,internal,inChange
system
massandwork,heat,by
nsferenergy traNet
TTmcuumtQWW
UQWW
EEE
v
outin





The total mass of air in the room iskg284.6
)K288)(K/kgmkPa0.287(
)m240)(kPa98(
m240m865
3
3
1
1
33




RT
P
m
V
V
Then the power rating of the electric heater is determined to bekW4.93
 
s)60C)/(181525)(CkJ/kg0.720)(kg284.6()kJ/s0.3()kJ/s200/60(
/)( 12infan,outine, tTTWQW mc
v

(b) The temperature rise that the air experiences each time it passes through the heater is determined by applying the energy
balance to the duct,TcmhmWW
hmQhmWW
EE
p
outin






infan,ine,
2
0
out1infan,ine, 0)peke(since
Thus,C6.2




 )KkJ/kg1.007)(kg/s50/60(
kJ/s)0.34.93(infan,ine,
pcm
WW
T 

568 m3
We
300 W
200 kJ/min

Loading page 14...

1-14
1-30 The ducts of an air heating system pass through an unheated area, resulting in a temperature drop of the air in the duct.
The rate of heat loss from the air to the cold environment is to be determined.
Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -
141C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, ke  pe  0. 3 Constant specific heats at
room temperature can be used for air. This assumption results in negligible error in heating and air-conditioning applications.
Properties The specific heat of air at room temperature is cp = 1.007 kJ/kg·C (Table A-15).
Analysis We take the heating duct as the system. This is a control volume since mass crosses the system boundary during the
process. We observe that this is a steady-flow process since there is no change with time at any point and thus0and0 CVCV  Em
. Also, there is only one inlet and one exit and thusmmm   21 . The energy balance for this
steady-flow system can be expressed in the rate form as)(
0)peke(since
0
21out
21
energiesetc.potential, kinetic,internal,inchangeofRate
(steady)0
system
massandwork,heat,by nsferenergy tranetofRate
TTcmQ
hmQhm
EEEEE
p
out
outinoutin






  
  
Substituting,    kJ/min272C3CkJ/kg1.007kg/min90out  TcmQ p
90 kg/min AIR
Q
·

Loading page 15...

1-15
1-31 Air is moved through the resistance heaters in a 900-W hair dryer by a fan. The volume flow rate of air at the inlet and
the velocity of the air at the exit are to be determined.
Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -
141C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, ke  pe  0. 3 Constant specific heats at
room temperature can be used for air. 4 The power consumed by the fan and the heat losses through the walls of the hair dryer
are negligible.
Properties The gas constant of air is R = 0.287 kPa.m3/kg.K (Table A-1). Also, cp = 1.007 kJ/kg·K for air at room
temperature (Table A-15).
Analysis (a) We take the hair dryer as the system. This is a control volume since mass crosses the system boundary during the
process. We observe that this is a steady-flow process since there is no change with time at any point and thus0and0 CVCV  Em
, and there is only one inlet and one exit and thusmmm   21 . The energy balance for this
steady-flow system can be expressed in the rate form as)(
0)peke(since
0
12ine,
2
0
1
0
infan,ine,
energiesetc.potential, kinetic,internal,inchangeofRate
(steady)0
system
massandwork,heat,by
nsferenergy tranetofRate
TTcmW
hmQhmWW
EEEEE
p
out
outinoutin






  
 


Thus, 
kg/s0.03575
C)2550)(CkJ/kg1.007(
kJ/s0.9
12
e,in




 TTc
W
m
p


Then,/sm0.0306 3




)/kgm0.8553)(kg/s0.03575(
/kgm0.8553
kPa100
)K298)(K/kgmkPa0.287(
3
11
3
3
1
1
1
v
V
v
m
P
RT

(b) The exit velocity of air is determined from the conservation of mass equation,m/s5.52





 24
3
2
2
222
2
3
3
2
2
2
m1060
)/kgm0.9270)(kg/s0.03575(1
/kgm0.9270
kPa100
)K323)(K/kgmkPa0.287(
A
m
VVAm
P
RT
v
v
v

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Solution Manual For Heat And Mass Transfer: Fundamentals And Applications, 5th Edition

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