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4.2 Turbine design considerations with different working fluids 63 8 7 6 5 4 3 2 1 0 0.25 0.3 0.35 0.4 0.45 0.5 R245fa toluene MDM Degree of reaction, [−] 40 35 30 25 20 15 10 5 0 0.25 0.3 0.35 0.4 0.45 0.5 R245fa toluene MDM Degree of reaction, [−] (a) (b) 1.35 1.3 1.25 1.2 1.15 1.1 1.05 1 0.95 0.25 0.3 0.35 0.4 0.45 0.5 R245fa toluene MDM Degree of reaction, [−] 3 2.5 2 1.5 1 0.5 0 0.25 0.3 0.35 0.4 0.45 0.5 R245fa toluene MDM Degree of reaction, [−] (c) (d) Figure 4.12: Effect of the degree of reaction on the turbine blade height at the rotor inlet (a), blade height ratio t2/t1 (b), velocity ratio cu1/u1 (c), and Mach number at the stator outlet (d). The turbine power is 100 kW in the calculated cases. on the cycle efficiency with working fluids toluene, MDM, and R245fa is presented in Figure 4.13 showing that the higher the turbine inlet pressure, the higher the simulated cycle effciency. The results of turbine diameter are presented in Figure 4.14a, the results of the blade height at the rotor inlet are presented Figure 4.14b, the results of the blade height ratio t2/t1 in Figure 4.14c, and the results of the rotational speed in Figure 4.14d. The turbine power is 100 kW in all the calculated cases. The results indicate that the lower the turbine inlet pressure, the higher the blade height at the rotor inlet, the larger the turbine wheel, and the lower the rotational speed of the turbine. In addition, when a lower turbine inlet pressure is selected, the rotor blade height ratio t2/t1 is lower. Thus, it can be estimated Velocity ratio c /u at the rotor inlet u1 1 Blade height at the rotor inlet, [mm] Mach number at the rotor inlet, [−] Rotor blade height ratio t /t , [−] 21PDF Image | WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES
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