任意过程的△H和△U的计算 S.J.T.U. Phase Transformation and Applications 对用2个变量描述的封闭体系，任意过程的内能和焓变分别为 dU=(OU/OT)ydT+(aU/ov)dv=CydT+[T(Op/OT)vP]dv dH=(oH/OT)dT+(H/op)dp=CdT+[-T (oV/OT)+V]dp SJTU Thermodynamics of Materials Spring2010©X.J.Jin Lecture 6 Property Relation llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 6 Property Relation II 任意过程的 ΔH 和 ΔU 的计算 对用2个变量描述的封闭体系，任意过程的内能和焓变分别为 dU= ( ∂U/∂T ) VdT+ ( ∂U/∂V ) TdV= CVdT+[ T ( ∂p/∂T ) V -P ]dV dH= ( ∂H/∂T ) pdT+ (∂H/∂p) Tdp= CpdT+ [−T (∂V/∂T) p+V]dp