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Geometry Flow Medium Pressure Drop Initial Conditions Pipe Figure 12: A pipe model inherits code concerning its properties from several classes As an example of multiple inheritance, a schematic figure of a pipe model is shown in figure 12 above. The pipe model, which consists of a control volume and a flow model, inherits code from among others the classes Geometry, Medium, PressureDrop and Initialization. Then any change in these classes will immediately take place in the pipe as well. The use of multiple inheritance creates a powerful flexibility when important properties can be separated as e.g. slow and fast dynamics, medium models, choices of dynamic states, heat transfer and pressure drop. This makes the separate properties of the model very easy to replace, but the code becomes less readable, since the corresponding equations can then be found in many different files. Dymola can automatically generate html-documentation of each model with hypertext links to all inherited classes, which helps to overview the model structure. The medium models in ThermoFluid are carefully chosen to be very accurate but yet fast for computational reasons. The enthalpy, heat capacity and entropy for ideal gases are given below as functions of temperature, taken from Gordon (1994). (4.4.1) (4.4.2) (4.4.3) For each medium the coefficients ai and bi and other parameters are given in a data record. Water/steam data is taken from IAPWS-IF97, Wagner (1998). The ThermoFluid library uses non-causal modelling, which means that the simulation program, in this case Dymola, takes the given equations and automatically turns it into a causal sequence of calculation for the solver to use it. For the user to understand the sequence of calculation, the algorithm will now be further explained, Perez (2001). T2T3T4T5 h(T)=R−a1T−1 +a2 lnT+a3T+a4 +a5 +a6 +a7 +b1 2345 c (T)=R(aT−2 +aT−1 +a +aT+aT2 +aT3 +aT4) p1234567 T−2 T2 T3 T4 s(T)=R−a12 −a2T−1+a3lnT+a4T+a5 2+a6 3+a7 4+b2 20PDF Image | Modelling of Microturbine Systems
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