Redo Problem 6.32 using Aspen Plus

Problem 6.32

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.

Table 6.6-1.

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 Pressure - Enthalpy Diagram SUVA HFC-134a (SI Units) 0.65 0.70 0.75 0.00070 -30 temperature -20C -0.80- -0.85- 0.90- 150 200 960- 250 1.00- 1.05- 1.10- 1.15- 1.20: 200 1885 300 1.35. 1.30 21.25. 250 0.0009 temperature 0C 1764 20 300 350 0.001 350 400 0.001 0.0013 (0.0012, -0.0014 450 400 450 8888888 Enthalpy (kJ/kg) 0.0016 0.0018 80 500 100 1104 120+ 500 0.0020 550 FOEK HELLIN 140 160 335 41503 NUKITS $65 0/1 EN RECE 550 1801 600 0.0030 volume-0.0040 m/kg 061 200 temperature 220 BEHI SE 650 0.0060 - 50 600 0.0080 0.010 0.015 0.020 0.030 0.040 0.060 ++ 0.080 0.10 0.15 0.20 0.30 0.40 HIH 0.60 0.80 1.0 O... 1.5 2.0 650 700 200. 100. 80. 60. 40. 8 20. 10. 8. 6. 2. 1. 0.8 CO CO 0.6 0.4 0.2 0.1 700 Pressure (bar)