10焓( Enthalpy) Enthalpy, a state function is defined as follows hsu+ pv This energy is composed of two parts: the internal energy of the fluid(u and the flow work (pv)associated with pushing the mass of fluid across the system boundary. 对开口系统而言,焓指流动工质所携带能量的一部 分,这部分能量取决于热力状态10.焓（Enthalpy） Enthalpy, a state function, is defined as follows, h= u + pv This energy is composed of two parts: the internal energy of the fluid (u) and the flow work (pv) associated with pushing the mass of fluid across the system boundary. 对开口系统而言，焓指流动工质所携带能量的一部 分，这部分能量取决于热力状态