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36 Model be above 85oC as the cooling water enters the condenser at a temperature of 80oC. The cooling water flow rate in the truck’s cooling system has been limited to a maximum of 1l/s. Table 3-9 summarizes the above discussion. 3-9 Structure Mapping The segment number has been considered as the only optimization variable from the fluid component parameters of the PCP-SAFT model. Hence a simple selection based on the distance between the hypothetical and real segment numbers has been done. The design of the CoMT-CAMD approach described above has been implemented in the form of a software tool. The following section presents the architecture for the same. 3-10 Implementation into a software tool The ORC system described earlier has been modeled in Cycle-Tempo [8]. The process pa- rameters are written on a series of input files called INFILE1, INFILE2, INFILE3 and the outputs from the system simulation are written onto a series of output files called OUTFIL1, OUTFIL2, OUTFIL3 and OUTFIL4. Cycle-Tempo allows the user to specify the working fluid and the thermodynamic model. The hypothetical fluid parameters are written onto a text file identified by .saf extension. This fluid is then used as a working fluid in the ORC system. Cycle-Tempo calls FluidProp [37] when the system simulation is carried out. The radial turbine model described in the previous section has been implemented into the calculation core of Cycle-Tempo. The GA has been implemented into a state of the art optimization suite called Nexus (version 2.1) [20]. The system optimization variables viz. evaporator and condenser pressures are defined as continuous variables in Nexus and written onto the INFILE1 of Cycle-Tempo. The segment number being the fluid optimization variable, is used to calculate the other parameters of the PCP-SAFT model based on the expression defined earlier. These param- eters are then written onto the fluid file through Nexus. The objective function i.e. net power output is read from the OUTFIL4 along with other cycle parameters. The tool inter- acts with MATLAB [59] in which the functions to calculate the evaporator pressure and the pinch point temperature difference have been implemented. Figure 3-17 illustrates the entire programming framework and the relations between Cycle-Tempo, FluidProp, MATLAB and Nexus. Akshay Hattiangadi Master of Science ThesisPDF Image | Working Fluid Design for Organic Rankine Cycle
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