By Damian Flynn; A Alessandri; Institution of Electrical Engineers.; et al
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Org) with the minimum extension required to cope with DPC's, for example heat exchangers, according to the approach proposed by Aime and Maffezzoni (2000). 2 Classification of plant components and of physical ports From the point of view of model structuring, it is convenient to look at the typical layout of a fossil-fired power plant (Maffezzoni and Kwatny, 1999). In the case of a classical Rankine-cycle unit, the principal subsystems are the steam generator Modelling of power plants 19 (or boiler), the steam turbine, the condensed water cycle and the electrical subsystem.
Note also that Modelica has an extensive library of predefined types. 1 a suggests the model structure of Figure 2. lb. 2 Typical heat exchanger configuration and enthalpy at the valve inlet, respectively, while the mass flow rates at the pump outlet and valve inlet sum to zero. Pressure and enthalpy are effort variables while mass flow rate is a flow variable. The interaction between a couple of neighbouring OSCs can always be modelled by the direct connection of two THTs. 1 is as follows: c o n n e c t (PUMP.
19) (Wr Wdhl where Mv = Pv Vv is the steam mass (Pv and Vv are the steam density and volume), E v = V v ( p v h v - p ) is the total steam energy (hv is the steam enthalpy and p the pressure in the cavity), h~v = hvs - (1 -XPv) (hvs - his) is the enthalpy of W'v (hvs and his are the saturation vapour and liquid enthalpies), Ml = p l ( V - Vv) is the liquid mass (V is the total volume of the drum and Pi the liquid density), E1 = ( V - V v ) ( p l h l - p ) is the total liquid energy (hi is the liquid enthalpy) and ht is the feedwater enthalpy.