4 Thermodynamic Process of Gas & VaporObjectiveThermodynamic Process of Ideal-GasThermodynamic Process of Vapor and HumidityAirThrottlingProcessAnalysisThermodynamic Process for Typical Devices
4 Thermodynamic Process of Gas & Vapor Objective •Thermodynamic Process of Ideal-Gas •Thermodynamic Process of Vapor and Humidity Air • Throttling Process Analysis • Thermodynamic Process for Typical Devices
Thermodynamic Process of Ideal-GasObjective·Process Equation: Given Initial PropertiesOtherFinalOnes· Process Equation + Given Final Properties→OtherFinal Ones·EnergyTransfer During Process
Thermodynamic Process of Ideal-Gas Objective • Process Equation • Given Initial Properties Other Final Ones • Process Equation + Given Final Properties Other Final Ones • Energy Transfer During Process
Thermodynamic Process of Ideal-GasReview: 1st Law of Thermodynamicsq= u+wq = △h + w,w= w, +△(pv) w :W.=*1=W.+=△c-g4z一W.S2 State Equation of Ideal-GaspV=RT
Thermodynamic Process of Ideal-Gas Review • 1st Law of Thermodynamics 2 2 1 1 2 ( ) d d 1 2 t t t t s q u w q h w w w pv w p v w v p w w c g z • State Equation of Ideal-Gas pv RT
ThermodynamicProcessAnalysisIsovolumetricProcessThe Volume of gas is unchanged during processProcessEquationdv=0v = ConstV = ConstRelationshipBetweenInitial&FinalStateP2 _ TpiTc,dTh, -h :.C.dT-=dTST
Thermodynamic Process Analysis • Isovolumetric Process The Volume of gas is unchanged during process. Process Equation d Const V Const v 0 v Relationship Between Initial & Final State 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 d d d p v v p T p T h h c T u u c T T s s c T
Thermodynamic Process AnalysisIsovolumetric Processp2out1Lout22'EnergyTransfer1q= u+w= u=uz-u,定容过程中工质不做膨胀功，它吸收的热量全部用于增加其内能
Thermodynamic Process Analysis • Isovolumetric Process p v 1 2 2’ Qin Qout T s 1 2 2’ Qin Qout Energy Transfer d 2 1 2 1 w p v q u w u u u 定容过程中工质不做膨胀功，它吸收的热量全部用于 增加其内能