Chap.2 SummaryTotal Energy.EIntemal Energy.UPotential Energy,PEKineticEnergy.KEForms of EnergyEnergyE=U+KE+PE=U+mV2/2+mgzMechanical energy,Nuclear energy,Chemical Energy,Sensible energyLatent energy,Thermal energy, Heat, Work, Flow workConvectionTemperature diffBy Heat,QConductionRadiationEnergyTransfer,Force*distanceBy Work, wForms of work:mechanical;shaft,spning,electrical,etcByMass,m=0,foraclosedsystemclosed systemQ=△U+ WEin-Eout=AEsystem1stLawofThermodynamicsEnergybalance:Ein-Eout-(Qin-Qout)+(Win-Wout)+(Emassin-Emass,out)=AEsystemEnergyChangeEffciency=desiredoutputl required inputEnergyConversionEfficiencyCombustion efficiency.Overall efficiency.effciency ofgenerator,motor,pump,turbine,etcEnergyand Environment
E=U+KE+PE=U+mV2 /2+mgz Chap.2 Summary 1 Forms of Energy Energy Transfer, E Total Energy, E Kinetic Energy, KE Potential Energy, PE Conduction Convection Radiation Effciency =desired output/ required input Ein-Eout= ∆Esystem Internal Energy,U 1st Law of Thermodynamics Energy balance: Ein-Eout=(Qin-Qout)+(Win-Wout)+(Emass,in-Emass,out)= ∆Esystem Energy Conversion Efficiency Energy and Environment Mechanical energy, Nuclear energy, Chemical Energy, Sensible energy, Latent energy, Thermal energy, Heat, Work, Flow work Energy By Heat , Q Temperature diff Forms of work: mechanical, shaft, spring,electrical, etc By Work, W Force*distance By Mass, m =0, for a closed system closed system Q=∆U+ W Energy Change: Combustion efficiency, Overall efficiency, efficiency of generator, motor, pump, turbine, etc
Chap.3 SummaryAsinglechemicalelementorcompoundAsubstancethat hasPure substanceHomogeneousmixtureofvariouschemicalelementsorcompoundsafixedchemicalcompositionmixtureoftwoormorephasesapuresubstanceCompressed liguid orsubcooled liquidliquidSaturated liquidSatruated liquid-vapor mixturePhase changeprocessSatruated vaporvaporSuperheatedvapor+Psat,Tsat,Latentheatoffusion/vaporization,sublimationsolidCritical pointSaturated liquid/vapor lineSuperheatedvaporregionT-v,P-v,P-T, P-v-T diagramsTripple pointCompressedliquid regionSaturated liquid-vapor region1Enthalpy/焰:acombinationpropertyh=u+Pv(kJ/kg);Entropy/PropertiestablesSaturated liguid/vaporormixture.ht,ha,haQualityx=[0.1]SuperheatedvaporCompressedliquid P,TReferencestatevalues1PV=RTPV=mRTR,RuIdeal gasequationofstateIdeal-gas/realgasZ=Pv/RTCompressibilityfactorReducedPReducedTequationofstateGeneralizedVanderwallsPrincipleofcorresponding statescompressibility chartequationofstate2
Chap.3 Summary 2 A substance that has a fixed chemical composition Phase change process A single chemical element or compound Enthalpy/焓: a combination property h=u+Pv (kJ/kg); Entropy/熵 Critical point T-v, P-v,P-T, P-v-T diagrams Properties tables Ideal-gas / real gas equation of state Pure substance liquid vapor solid Homogeneous mixture of various chemical elements or compounds mixture of two or more phases a pure substance Saturated liquid Satruated liquid-vapor mixture Satruated vapor Superheated vapor Compressed liquid or subcooled liquid Psat, Tsat, Latent heat of fusion/vaporization, sublimation Tripple point Saturated liquid/vapor line Superheated vapor region Compressed liquid region Saturated liquid-vapor region Saturated liquid/vapor or mixture. hf ,hg,hfg Quality x=[0,1] Superheated vapor Compressed liquid P, T Reference state/values Ideal gas equation of state Pv=RT PV=mRT R, Ru Compressibility factor Z=Pv/RT Reduced P Reduced T Principle of corresponding states Generalized compressibility chart Van der walls equation of state
Chapter 3 Properties of Pure SubstancesConcept of Pure substancePhysics of phase-change processesP-v, T-v, P-T, P-v-T diagramspropertytablesideal gas, ideal-gas equation of state
Chapter 3 Properties of Pure Substances • Concept of Pure substance • Physics of phase-change processes • P-v, T-v, P-T, P-v-T diagrams • property tables • ideal gas, ideal-gas equation of state 3
3-1 Pure Substance(纯物质): Pure Substance definition: a substance that hasafixed chemical composition.-Asinglechemicalelementorcompound:Water,nitrogen,helium, carbon dioxideHomogeneousmixtureofvariouschemicalelementsorcompounds:air (uniformchemicalcomposition)mixtureoftwoormorephasesofapuresubstance:iceandliquidwater.Mixture of liquidair and gaseous airisnot
3-1 Pure Substance (纯物质) • Pure Substance definition: a substance that has a fixed chemical composition. – A single chemical element or compound: Water, nitrogen, helium, carbon dioxide – Homogeneous mixture of various chemical elements or compounds: air (uniform chemical composition) – mixture of two or more phases of a pure substance: ice and liquid water. • Mixture of liquid air and gaseous air is not 4
3-2 Phases of a pure substance. 3 principal phases: solid, liquid, gasLiquid: groups ofSolid:moleculesatGas:moleculesmovemoleculesmovefixed positionsaboutatrandomabouteach otherC(a)0
3-2 Phases of a pure substance • 3 principal phases: solid, liquid, gas Solid: molecules at fixed positions Liquid: groups of molecules move about each other Gas: molecules move about at random 5