Thermodynamics: An Engineering Approach9th EditionYunus A. Cengel Dr., Michael A. Boles Publisher: McGraw-Hill EducationISBN: 9781259822674
Thermodynamics: An Engineering Approach
Solutions for Thermodynamics: An Engineering Approach
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Browse All Chapters of This Textbook
Chapter 1.11 - Problem-solving TechniqueChapter 2.8 - Energy And EnvironmentChapter 3.8 - Other Equations Of StateChapter 4.5 - Internal Energy, Enthalpy, And Specific Heats Of Solids And LiquidsChapter 5.5 - Energy Analysis Of Unsteady-flow ProcessesChapter 6.11 - The Carnot Refrigerator And Heat PumpChapter 7.13 - Entropy BalanceChapter 8.8 - Exergy Balance : Control VolumesChapter 9.12 - Second-law Analysis Of Gas Power CyclesChapter 10.9 - Combined Gas-vapor Power Cycles
Chapter 11.10 - Absorption Refrigeration SystemsChapter 12.6 - The Dh, D.u, And D.s Of Real GasesChapter 13.3 - Properties Of Gas Mixtures: Ideal And Real GasesChapter 14.7 - Air-conditioning ProcessesChapter 15.7 - Second-law Analysis Of Reacting SystemsChapter 16.6 - Phase EquilibriumChapter 17.7 - Steam Nozzles
Sample Solutions for this Textbook
We offer sample solutions for Thermodynamics: An Engineering Approach homework problems. See examples below:
Chapter 1.11, Problem 1PChapter 1.11, Problem 53PChapter 1.11, Problem 56PChapter 1.11, Problem 64PChapter 1.11, Problem 67PChapter 1.11, Problem 68PChapter 1.11, Problem 69PChapter 1.11, Problem 77PChapter 1.11, Problem 88RP
Chapter 1.11, Problem 94RPChapter 1.11, Problem 98RPChapter 1.11, Problem 101RPChapter 1.11, Problem 103RPChapter 2.8, Problem 1PChapter 2.8, Problem 32PChapter 2.8, Problem 34PChapter 2.8, Problem 47PChapter 2.8, Problem 49PChapter 2.8, Problem 50PChapter 2.8, Problem 56PChapter 2.8, Problem 69PChapter 2.8, Problem 73PCalculate the rate of heat transfer by convection. Q˙conv=hAΔT=h(πD2)(Ts−To) (I) Here, change in the...Chapter 2.8, Problem 101PChapter 2.8, Problem 119RPChapter 2.8, Problem 122RPConvert the absolute pressure of the air from mm Hg to kPa. P=(700 mm Hg)(0.1333 kPa1 mm Hg)=93.31...Chapter 3.8, Problem 1PChapter 3.8, Problem 30PChapter 3.8, Problem 42PChapter 3.8, Problem 63PChapter 3.8, Problem 84PChapter 3.8, Problem 86PChapter 3.8, Problem 89PDetermine the final temperature using the ideal gas equation. T2=(T1)×(v2v1) (I) Here, the initial...Chapter 3.8, Problem 95PChapter 3.8, Problem 96PChapter 3.8, Problem 97PChapter 3.8, Problem 109RPChapter 3.8, Problem 110RPRefer to Table A-1, obtain the gas constant, critical pressure, and critical temperature of steam....Chapter 4.5, Problem 1PChapter 4.5, Problem 20PChapter 4.5, Problem 29PChapter 4.5, Problem 40PChapter 4.5, Problem 41PChapter 4.5, Problem 44PChapter 4.5, Problem 54PChapter 4.5, Problem 55PChapter 4.5, Problem 62PChapter 4.5, Problem 81PChapter 4.5, Problem 120RPChapter 4.5, Problem 123RPChapter 4.5, Problem 134RPChapter 4.5, Problem 136RPWrite the expression for the energy balance equation. Ein−Eout=ΔEsystem (I) Here, the total energy...Chapter 4.5, Problem 142RPChapter 5.5, Problem 1PChapter 5.5, Problem 32PChapter 5.5, Problem 33PChapter 5.5, Problem 55PChapter 5.5, Problem 83PChapter 5.5, Problem 89PChapter 5.5, Problem 100PAt the final observation, the valve is closed and the tank composed with one-half water and vapor at...Write the equation of mass balance. min−me=Δmsystem (I) Here, the inlet mass is min, the exit mass...Chapter 5.5, Problem 128PChapter 5.5, Problem 173RPWrite the general mass balance equation. m˙in−m˙out=ddt(msystem)m˙in−m˙out=dmsystemdt (I) Here, the...Write the formula for mass of air (ma) at initial and final states. ma,1=(P1ν1RT1)a (I)...Chapter 5.5, Problem 178RPChapter 5.5, Problem 179RPChapter 5.5, Problem 183RPChapter 5.5, Problem 184RPChapter 5.5, Problem 185RPChapter 5.5, Problem 186RPChapter 5.5, Problem 188RPChapter 6.11, Problem 1PDetermine the construction costs of coal. Construction costcoal=[(the amount of elelctricity...Determine the construction costs of coal. Construction costcoal=[(the amount of elelctricity...Chapter 6.11, Problem 57PChapter 6.11, Problem 58PChapter 6.11, Problem 107PChapter 6.11, Problem 111PChapter 6.11, Problem 112PChapter 6.11, Problem 124PChapter 6.11, Problem 129RPChapter 6.11, Problem 130RPDetermine the COP of a reversible heat pump depends on the temperature limits in the cycle only....Determine the mass of the air in the truck. mair=ρair×νtruck=ρair×(l×b×h)truck (I) Here, the density...Determine the rate of water saved volume of the low-flow shower head a family of four will save per...Determine the density of air at the indoor conditions. ρo=PoRTo (I) Here, the house maintain a...Determine the density of air at the indoor conditions. ρo=PoRTo (I) Here, the house maintain a...Chapter 6.11, Problem 152RPChapter 7.13, Problem 1PChapter 7.13, Problem 43PWrite the expression for the energy balance equation. Ein−Eout=ΔEsystem (I) Here, the total energy...Write the expression for the energy balance equation for closed system. Ein−Eout=ΔEsystem (I) Here,...Chapter 7.13, Problem 110PChapter 7.13, Problem 112PWrite the expression for the energy balance equation for closed system. Ein−Eout=ΔEsystem (I) Here,...Chapter 7.13, Problem 140PWrite the expression for the energy balance equation for closed system. E˙in−E˙out=ΔE˙system (I)....Write the expression for the energy balance equation for closed system. E˙in−E˙out=ΔE˙system chicken...Chapter 7.13, Problem 154PWrite the expression to calculate the enthalpy change in process 1-2. ΔS1−2=−mRlnP2P1 (I) Here,...Chapter 7.13, Problem 174RPChapter 7.13, Problem 175RPChapter 7.13, Problem 180RPWrite the formula to calculate the specific entropy of steam from tables (s). s=sf+x(sfg) (I) Here,...Refer to Table A-2Ea, obtain the properties of air at room temperature. Gas constant, R=0.3704...Refer to Table A-2Ea, obtain the properties of air at room temperature. Gas constant, R=0.3704...Write the formula to calculate the specific volume of steam from tables (v). v=vf+x(vg−vf) (I) Here,...Write the expression for the energy balance equation for closed system. Ein−Eout=ΔEsystem (I) Here,...Write the expression for the energy balance equation for closed system without air in the room....Write the expression for the energy balance equation for closed system. Ein−Eout=ΔEsystem (I) Here,...Chapter 7.13, Problem 209RPWrite the expression for the energy balance equation for the closed system. ΔEin−ΔEout=ΔEsystem (I)...Chapter 8.8, Problem 1PChapter 8.8, Problem 29PChapter 8.8, Problem 33PChapter 8.8, Problem 48PExpress the final volume of the air. νa2=νa1−νw (I) Here, initial volume of air is νa1 and volume of...Draw the schematic diagram of the flow of refrigerant-134a through evaporator section as shown in...Chapter 8.8, Problem 73PWrite the expression for the initial mass (m1) of helium in the cylinder. m1=P1VRT1 (I) Here,...Write the expression to calculate the specific volume of saturated water (v). v=vf+x(vg−vf) (I)...Write the ideal gas equation to calculate the mass of the gas (m). m=P1V1RT1 (I) Here, initial...Write the ideal gas equation to calculate the mass of the gas (m). m=P1V1RT1 (I) Here, initial...Chapter 8.8, Problem 114RPChapter 8.8, Problem 115RPWrite the formula to calculate initial mass of air in the tank (mi). mi=PiVRTi (I) Here, initial...Chapter 9.12, Problem 1PChapter 9.12, Problem 126PDraw the T−s diagram for pure jet engine as shown in Figure (1). Consider that the aircraft is...Chapter 9.12, Problem 134PChapter 9.12, Problem 135PChapter 9.12, Problem 136PDraw the T−s diagram for turbojet engine as shown in Figure (1). Consider, the pressure is Pi , the...Draw the ideal dual cycle on P−v diagram. Consider, the pressure is Pi , the specific volume is vi,...Draw the T−s diagram of the regenerative Brayton cycle as shown in Figure (1). Write the expression...Chapter 9.12, Problem 148PDraw T−s diagram for regenerative Brayton cycle as shown in Figure (1). Write the expression of...Chapter 9.12, Problem 151PChapter 9.12, Problem 152PDraw the P−v diagram of four stroke as in Figure (I). Refer to Table A-2b, obtain the properties of...Draw P−v diagram for an Ideal diesel cycle as shown in Figure (1). Assuming constant specific heats...Draw the P−ν for an ideal Otto cycle as shown in Figure (1). Write the expression for compression...Determine the state 2 temperature in the polytropic compression process 1-2. T2=T1(v1v2)n−1 (I)...Chapter 9.12, Problem 173RPDraw the P−v and T−s diagram for the given cycle. Thus, the P−v and T−s diagrams for the given cycle...Chapter 10.9, Problem 1PChapter 10.9, Problem 52PChapter 10.9, Problem 53PChapter 10.9, Problem 62PChapter 10.9, Problem 69PChapter 10.9, Problem 82PChapter 10.9, Problem 85PChapter 10.9, Problem 86PChapter 10.9, Problem 98RPShow the T-s diagram as in Figure (1). Express Prandtl number at state 8s. Pr8s=P8sP7Pr7 (I) Here,...Chapter 10.9, Problem 110RPChapter 10.9, Problem 111RPChapter 11.10, Problem 1PChapter 11.10, Problem 21PChapter 11.10, Problem 22PShow the T-s diagram for ideal vapor-compression refrigeration cycle as in Figure (1). From Figure...Chapter 11.10, Problem 33PChapter 11.10, Problem 42PShow the T-s diagram for compression refrigeration cycle as in Figure (1). From Figure (1), write...Chapter 11.10, Problem 57PExpress the specific enthalpy at state 2 using Carnot efficiency. ηC=h2s−h1h2−h1 (I) Here, specific...Chapter 11.10, Problem 65PChapter 11.10, Problem 79PChapter 11.10, Problem 115RPShow the T-s diagram for refrigeration system as in Figure (1). From Figure (1), write the specific...Chapter 11.10, Problem 118RPChapter 12.6, Problem 1PChapter 12.6, Problem 42PChapter 12.6, Problem 72PChapter 12.6, Problem 73PWrite the general formula energy balance equation for closed system. E˙in−E˙out=ΔE˙system (I) Here,...Write formula for enthalpy departure factor (Zh). Zh=(hideal−h)T,PRTcr (I) Here, the enthalpy at...Write the energy rate balance equation for one inlet and one outlet system....Chapter 12.6, Problem 96RPRefer the table A-2 (c), “Ideal gas specific heats of various common gases”. The general empirical...Write formula for specific volume (v) in terms of compressibility factor (Z). v=ZRTP (I) Here, the...Chapter 12.6, Problem 101RPChapter 13.3, Problem 1PChapter 13.3, Problem 32PWrite the equation to calculate the mole number of oxygen and nitrogen gas using an ideal gas...Refer to Table A-1E, Obtain the molar masses of O2,N2, CO2, and CH4 as below: MO2=32.0...Chapter 13.3, Problem 56PRefer to Table A-1E, Obtain the molar masses of N2,O2, H2O, and CO2 as below: MN2=28.0...Chapter 13.3, Problem 72PWrite the entropy balance equation to obtain the expression of entropy generation in terms of H2 and...Chapter 13.3, Problem 93RPChapter 13.3, Problem 94RPWrite the expression to obtain the mole number of O2 (NO2). NO2=mO2MO2 (I) Here, molar mass of O2 is...Chapter 14.7, Problem 1PChapter 14.7, Problem 29PExpress initial partial pressure. Pν1=Pν2=ϕ1Pg1=ϕ1Psat@10°C (I) Here, partial pressure at state 2 is...Chapter 14.7, Problem 79PChapter 14.7, Problem 81PChapter 14.7, Problem 86PChapter 14.7, Problem 88PExpress the mass flow rate of dry air at state 1. m˙a1=V˙1v1 (I) Here, volume flow rate at state 1...As the process is a steady flow and thus the mass flow rate of dry air remains constant during the...As the process is a steady flow and thus the mass flow rate of dry air remains constant during the...Chapter 14.7, Problem 130RPChapter 14.7, Problem 132RPChapter 14.7, Problem 134RPAs the process is a steady flow and thus the mass flow rate of dry air remains constant during the...Chapter 15.7, Problem 1PExpress the total mass of the coal when the ash is substituted. mtotal=100−mash (I) Here, mass of...Express the total mass of the coal when the ash is substituted. mtotal=100−mash (I) Here, mass of...Express the number of moles of carbon. NC=mfCMC (I) Here, molar mass of carbon is MC and mole...Express the total mass of the coal when the ash is substituted. mtotal=100−mash (I) Here, mass of...Chapter 15.7, Problem 83PChapter 15.7, Problem 92PChapter 15.7, Problem 93PChapter 15.7, Problem 106RPChapter 15.7, Problem 112RPChapter 15.7, Problem 113RPChapter 15.7, Problem 114RPChapter 16.6, Problem 1PExpress the standard-state Gibbs function change....Express the standard-state Gibbs function change. ΔG*(T)=vH2Og¯*H2O(T)−vH2g¯*H2(T)−vO2g¯*O2(T) (I)...Express the standard-state Gibbs function change. ΔG*(T)=vCO2g¯*CO2(T)−vCOg¯*CO(T)−vO2g¯*O2(T) (I)...Express the standard-state Gibbs function change. ΔG*(T)=vCOg¯*CO(T)+vO2g¯*O2(T)−vCO2g¯*CO2(T) (I)...Chapter 16.6, Problem 32PWrite the expression for the volume of oxygen used per lbmol of carbon monoxide (vCO). vCO=RTP (I)...Write the stoichiometric equation for combustion of 1 kmol of liquid propane (C3H8)....Write the expression for the stoichiometric reaction for reaction 1. H2O⇌H2+12O2 … (I) Here, the...Chapter 16.6, Problem 93RPWrite the energy balance equation for the reported process. Ein−Eout=ΔEsystem (I) Here, input energy...Determine the stagnation temperature of ideal gas. T0=T+V22cp (I) Here, the static temperature of...Chapter 17.7, Problem 80PWrite the expression for the velocity of sound after the normal shock. c2=kRT2 (I) Here, velocity of...Chapter 17.7, Problem 100PDetermine the inlet density of air. ρ1=P1RT1 (I) Here, the inlet pressure of air is P1, the...Chapter 17.7, Problem 108PChapter 17.7, Problem 110PWrite the Equation 17-38 as in text book (the relation between the pressures after shock and before...Write the given equation of state. P=RTv−b−av2 (I) Here, the pressure is P, the gas constant is R,...Chapter 17.7, Problem 128RPChapter 17.7, Problem 130RPChapter 17.7, Problem 131RPChapter 17.7, Problem 136RPChapter 17.7, Problem 137RP
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