7-75 Reconsider Prob. 7-73. Now, it is proposed that the liquid water coming out of the separator be used as the heat source in a binary cycle with isobutane as the working fluid (Fig. P7-75). Geothermal liquid water leaves the heat exchanger at 90°C while isobutane enters the turbine at 3.25 MPa and 145°C and leaves at 80°C and 400 kPa. Isobutane is condensed in an air-cooled condenser and then pumped to the heat exchanger pressure. Assuming an isentropic efficiency of 90 percent for the pump, determine (a) the mass flow rate of isobutane in the binary cycle, (b) the net power outputs of both the flashing and the binary sections of the plant, and (c) the thermal efficiencies of the binary cycle and the combined plant. The properties of isobutane at various states in the cycle are h, = 755.05 kJ/kg, h, = 691.01 kJ/kg, h. = 270.83 kJ/kg, and h,, = 276.65 kJ/kg. %3D 10
7-75 Reconsider Prob. 7-73. Now, it is proposed that the liquid water coming out of the separator be used as the heat source in a binary cycle with isobutane as the working fluid (Fig. P7-75). Geothermal liquid water leaves the heat exchanger at 90°C while isobutane enters the turbine at 3.25 MPa and 145°C and leaves at 80°C and 400 kPa. Isobutane is condensed in an air-cooled condenser and then pumped to the heat exchanger pressure. Assuming an isentropic efficiency of 90 percent for the pump, determine (a) the mass flow rate of isobutane in the binary cycle, (b) the net power outputs of both the flashing and the binary sections of the plant, and (c) the thermal efficiencies of the binary cycle and the combined plant. The properties of isobutane at various states in the cycle are h, = 755.05 kJ/kg, h, = 691.01 kJ/kg, h. = 270.83 kJ/kg, and h,, = 276.65 kJ/kg. %3D 10
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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
Transcribed Image Text:7-75 Reconsider Prob. 7-73. Now, it is proposed that the liquid water coming out of the separator be
used as the heat source in a binary cycle with isobutane as the working fluid (Fig. P7-75). Geothermal
liquid water leaves the heat exchanger at 90°C while isobutane enters the turbine at 3.25 MPa and
145°C and leaves at 80°C and 400 kPa. Isobutane is condensed in an air-cooled condenser and then
pumped to the heat exchanger pressure. Assuming an isentropic efficiency of 90 percent for the pump,
determine (a) the mass flow rate of isobutane in the binary cycle, (b) the net power outputs of both the
flashing and the binary sections of the plant, and (c) the thermal efficiencies of the binary cycle and
the combined plant. The properties of isobutane at various states in the cycle are h, = 755.05 kJ/kg,
h, = 691.01 kJ/kg, h = 270.83 kJ/kg, and h,, = 276.65 kJ/kg.

Transcribed Image Text:Steam
turbine
Separator
Condenser
Air-cooled
condenser
Binary
10
turbine
Binary
сycle
Flash
chamber
Нeat
Pump
exchanger
Production
Reinjection
well
well
Figure P7-75
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