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6th International Conference on Pumps and Fans with Compressors and Wind Turbines IOP Publishing IOP Conf. Series: Materials Science and Engineering 52 (2013) 042018 doi:10.1088/1757-899X/52/4/042018 2 Working fluid 43 Heat source 1 Figure 3. Exergy flow of gas heater 1 Figure 4. variation of thermal efficiency (ηth) with P max h 4. Working fluid selection Siloxanes were considered as the suitable working fluids for high temperature ORC[12].Instead of the full chemical names of the siloxanes we use the serial numbers as Siloxane1, Siloxane2 and Siloxane3. Therefore, these three siloxanes are taken into consideration as the high-temperature stage working fluids in the analysis. R143a is considered to be the low-temperature stage working fluid in the analysis. Table.2 shows physical property of fluids considered in this study. Gas heater 1 Table 2. Physical data of working fluids Substance M (kg/kmol) Tcr (°C) Pcr(MPa) R143a 84.04 72.71 3.761 Siloxane1 162.38 245.55 1.939 Siloxane2 296.62 313.34 1.332 Siloxane3 236.53 290.94 1.415 5. Results and discussion Fluid type Isentropic dry dry dry , when using different working fluids of high-temperature stage. It is obvious that with the increase of P , the ηth for three Fig.4 shows the thermal efficiency (ηth) of the CORC system at different P max h max h working fluids, Siloxane1, Siloxane2 and Siloxane3, increase in the beginning, and then decrease. That means each working fluid has the optimal maximum pressure of high-temperature stage. That’s because when the P increases, the turbine’s power output and pump’s energy consumption are both max h increasing, but the former has a faster increase before the optimum P and slower increase after the max h optimum P . The optimal pressure for Siloxane1, Siloxane2 and Siloxane3 and their corresponding max h value of thermal efficiency are 12.0 MPa with 8.35%, 5.7MPa with 7.53%,, 7.5 MPa with7.68%, Comparing to Siloxane2 and Siloxane3, Siloxane1 can get the higher thermal efficiency. However, higher maximum pressure is required, which means some components should be higher pressure resistance.In Fig. 5, the net power output of the CORC system is plotted for three different working fluids in the range of P . It can be noted that almost the same pattern presents as the Fig. 4. All the max h three working fluids have their maximum values of net power output corresponding to each optimal maximum pressure. Siloxane1 gets the maximum Pnet value of 37.71kW at the optimal P of 12MPa. max h Siloxane2 gets the maximum Pnet value of 34.10kW at the optimal P of 5.5MPa. Siloxane3 gets the max h maximum Pnet value of 34.74kW at the optimal P of 7.5MPa. Also as the thermal efficiency max h 5PDF Image | Parametric and exergetic analysis of a two-stage transcritical combined organic Rankine cycle used for multiple grades waste heat recovery of diesel engine
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