Repeat the calculations of Problem 6.13 if the mechanical efficiency of the adiabatic turbine is only 85

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Repeat the calculations of Problem 6.13 if the mechanical efficiency of the adiabatic turbine is only 85 percent.

Problem 6.13

Eighteen kilograms of the refrigerant HFC-134a at 150°C is contained in a 0.03-m3 tank. Compare the prediction you can make for the pressure in the tank with that obtained using Fig. 3.3-4. For data, see Table 6.6-1.

Fig. 3.3-4.

Pressure (MPa) 100 20. 10. 8. 6. 4. N 2. 1. 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 0.01 100 150 QUPORD

Table 6.6-1.Substance Acetylene Ammonia Argon Benzene n-Butane Isobutane 1-Butene Carbon dioxide Carbon monoxide Carbon

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