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below. In the power cycle, steam (water) with a mass flow rate m, enters the turbine at state 1. A portion of the steam (m,) exits the turbine at state 2 before passing through the mixing chamber. The remainder (ṁ, - 3 kg/s) exits the turbine at state 3 and then enters a heat exchanger where it is cooled by the refrigeration cycle. The water leaves the heat exchanger at state 4 as a saturated liquid and then is pumped up to the mixing chamber pressure. R-134a with a mass flow rate of mg is used in the refrigeration cycle to provide cooling to the water in the heat exchanger. Properties at each state are given in the figure below. Assume that the compressor, turbine, pump, mixing chamber, throttling valve and outer walls of the heat exchanger are well insulated and neglect changes in potential and kinetic energy across all devices. a) Determine the pump work, Wg. b) Determine the work output of the turbine, Wr. c) Determine the heat transfer from the water to the R-134a in the heat exchanger, Qye- d) Determine the compressor work, Wcomp, and the condenser heat transfer, Qc- e) Determine the coefficient of performance, B, of the refrigeration cycle. P,- 5000 kPa T, = 350°C P, = P, P, P = 2000 kPa T- 250°C Turbine 40% Mixing Chamber Steam Power Cycle H,0 m, = 3 kg's P, = 200 kPa P, = 2000 kPa -O X, = 90% P. = P, sat. liquid Heat Exchanger T-30°C sat. vapor T, = -30'C O sat. liquid Refrigeration Cycle R-134a Cae Throttling Valve Compressor m, Condenser P, = P,- 500 kPa T, = 75°C

below. In the power cycle, steam (water) with a mass flow rate m, enters the turbine at state 1. A portion of the steam (m,) exits the turbine at state 2 before passing through the mixing chamber. The remainder (ṁ, - 3 kg/s) exits the turbine at state 3 and then enters a heat exchanger where it is cooled by the refrigeration cycle. The water leaves the heat exchanger at state 4 as a saturated liquid and then is pumped up to the mixing chamber pressure. R-134a with a mass flow rate of mg is used in the refrigeration cycle to provide cooling to the water in the heat exchanger. Properties at each state are given in the figure below. Assume that the compressor, turbine, pump, mixing chamber, throttling valve and outer walls of the heat exchanger are well insulated and neglect changes in potential and kinetic energy across all devices. a) Determine the pump work, Wg. b) Determine the work output of the turbine, Wr. c) Determine the heat transfer from the water to the R-134a in the heat exchanger, Qye- d) Determine the compressor work, Wcomp, and the condenser heat transfer, Qc- e) Determine the coefficient of performance, B, of the refrigeration cycle. P,- 5000 kPa T, = 350°C P, = P, P, P = 2000 kPa T- 250°C Turbine 40% Mixing Chamber Steam Power Cycle H,0 m, = 3 kg's P, = 200 kPa P, = 2000 kPa -O X, = 90% P. = P, sat. liquid Heat Exchanger T-30°C sat. vapor T, = -30'C O sat. liquid Refrigeration Cycle R-134a Cae Throttling Valve Compressor m, Condenser P, = P,- 500 kPa T, = 75°C

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A schematic of a combined refrigeration cycle and a portion of a steam power cycle is shown in the figure below. In the power cycle, steam (water) with a mass flow rate m, enters the turbine at state 1. A portion of the steam (rm,) exits the turbine at state 2 before passing through the mixing chamber. The remainder (m, - 3 kg/s) exits the turbine at state 3 and then enters a heat exchanger where it is cooled by the refrigeration cycle. The water leaves the heat exchanger at state 4 as a saturated liquid and then is pumped up to the mixing chamber pressure. R-134a with a mass flow rate of ṁg is used in the refrigeration cycle to provide cooling to the water in the heat exchanger. Properties at each state are given in the figure below. Assume that the compressor, turbine, pump, mixing chamber, throttling valve and outer walls of the heat exchanger are well insulated and neglect changes in potential and kinetic energy across all devices. a) Determine the pump work, Wp. b) Determine the work output of the turbine, Wr. c) Determine the heat transfer from the water to the R-134a in the heat exchanger, ČHE- d) Determine the compressor work, Wcomp, and the condenser heat transfer, Qc. e) Determine the coefficient of performance, B, of the refrigeration cycle. P, T, = 350°C = 5000 kPa P; = 2000 kPa T- 250°C O im. P, P, P, Turbine * = 40% Mixing Chamber m, = 3 kgls %3D Steam Power Cycle P,= 200 kPa P; = 2000 kPa 6 X3 - 90% P. = P, sut. liquid Heat Exchanger Te -30°C sat. vapor T,- -30°c sat. liquid Refrigeration Cycle R-134a Cane Throttling Valve Compressor 10 Condenser P,- P,= 500 kPa T, = 75"C
Transcribed Image Text:A schematic of a combined refrigeration cycle and a portion of a steam power cycle is shown in the figure below. In the power cycle, steam (water) with a mass flow rate m, enters the turbine at state 1. A portion of the steam (rm,) exits the turbine at state 2 before passing through the mixing chamber. The remainder (m, - 3 kg/s) exits the turbine at state 3 and then enters a heat exchanger where it is cooled by the refrigeration cycle. The water leaves the heat exchanger at state 4 as a saturated liquid and then is pumped up to the mixing chamber pressure. R-134a with a mass flow rate of ṁg is used in the refrigeration cycle to provide cooling to the water in the heat exchanger. Properties at each state are given in the figure below. Assume that the compressor, turbine, pump, mixing chamber, throttling valve and outer walls of the heat exchanger are well insulated and neglect changes in potential and kinetic energy across all devices. a) Determine the pump work, Wp. b) Determine the work output of the turbine, Wr. c) Determine the heat transfer from the water to the R-134a in the heat exchanger, ČHE- d) Determine the compressor work, Wcomp, and the condenser heat transfer, Qc. e) Determine the coefficient of performance, B, of the refrigeration cycle. P, T, = 350°C = 5000 kPa P; = 2000 kPa T- 250°C O im. P, P, P, Turbine * = 40% Mixing Chamber m, = 3 kgls %3D Steam Power Cycle P,= 200 kPa P; = 2000 kPa 6 X3 - 90% P. = P, sut. liquid Heat Exchanger Te -30°C sat. vapor T,- -30°c sat. liquid Refrigeration Cycle R-134a Cane Throttling Valve Compressor 10 Condenser P,- P,= 500 kPa T, = 75"C
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