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Energies 2021, 14, 410 11 of 15 R227ea R1234ze R1234yf Propane Butane 0.0585 10.03 0.0568 0.0403 9.406 0.0391 0.0422 9.194 0.041 0.017 8.393 0.0166 0.0181 8.996 0.0175 As explained earlier, application in the refrigeration cycle. From the detailed calculations in Table 2, the com- binations of each of these three working fluids with ORC working fluids were further examined for their nominal less heat input and mass flow rate requirement while provid- ing the higher cycle efficiency. Considering the COP of the refrigeration cycle and effi- ciency of ORC for varying condenser temperature values, 24 combinations were now available for further consideration from the initial 64 combinations. Figure 6 provides the efficiency variation of the selected candidates in the VCC in combination with all the working fluids in ORC. For the condenser temperature variation, the mass flow rate and heat required in the vapor generator were computed so as the resultant efficiency of the system remained the same, as presented in Figure 6, with propane and R227ea providing the maximum and least values. ORC working fluids were further scrutinized for the lower mass flow requirement with the corresponding variation in compressor work, which ulti- mately becomes the required output work from the ORC cycle. A lower mass flow rate value would facilitate the system for component design and handling point of view. R123, R134a, R245fa, and propane are the most commonly studied fluids for ORC, with their corresponding effect on cycle efficiency [30]. In Table 2, it can be seen that when they were employed with the selected set of refrigeration fluids, they not only contributed to system efficiency but also needed relatively less heat input and mass of working fluid. Now, with further consideration of ORC working fluids, 12 combinations were scrutinized, as pre- sented in Figure 7. Figure 6. The efficiency of working fluids in ORC for set of condenser temperatures. 9.745 9.136 8.929 8.152 8.737 0.0551 9.453 0.038 8.861 0.0398 8.661 0.0161 7.907 0.017 8.475 0.0534 9.156 0.0368 8.583 0.0385 8.389 0.0156 7.659 0.0165 8.209 R123, R134a, and R245fa showed better suitability with theirPDF Image | Combined Power and Refrigeration System for Low-Grade Heat
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