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Energies 2021, 14, 410 6 of 15 (a) (b) Figure 2. Temperature-entropy diagram for ORC (a) and VCC (b). 3.2. Validation The model developed in the MATLAB environment, using the energy relations men- tioned earlier was tested for each of the cycles. The ORC model was validated by compar- ing the efficiency results of Saleh [14] and the present study. The computed values for ORC fluids R245fa and R1234ze at 100 °C heat supply temperature and 1267 kPa cycle maximum pressure while observing the operational constraints mentioned in the refer- ence are plotted in Figure 3. At the same time, the VCC model was compared for cooling application with the results of Nasir and Kim [28] to ensure the accuracy of the developed model. The computed COP values for a set of condenser temperatures using R245fa are presented in Figure 3. It can be seen that the percentage difference in the computed pa- rameters is negligible for both of the cycles signifying the accuracy of the developed mod- els. 8 R245fa R1234ze 15 6 10 45 20 30 32 34 36 38 40 Condenser temperature [oC] Figure 3. Validation of calculation methodology for each cycle. Refrence study Current study Current study Refrence studyPDF Image | Combined Power and Refrigeration System for Low-Grade Heat
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