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 (m₂) exits the turbine at state 2 before passing through the mixing chamber. The remainder (m3 = 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 me 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 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 (m₂) exits the turbine at state 2 before passing through the mixing chamber. The remainder (m3 = 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 me 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.

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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Question

Determine the compressor work, W,comp. And the condenser heat transfer, Qc.

P6 = Ps= P₂
X = 40%
mg (6)
Mixing
Chamber
Ps= 2000 kPa +5
W
W₂
T = -30°C
sat. vapor
Comp,
Pump
P₂ = 2000 kPa
T₂ = 250°C
9
Pg= P10 = 500 kPa
T₂ = 75°C
2 m₂
Compressor
P4 = P3
sat. liquid
4
P₁ = 5000 kPa
T₁ = 350°C
(1)
Steam Power Cycle
H₂O
Turbine
m
Heat Exchanger
Refrigeration Cycle
R-134a
me
Condenser
Q
m₂ = 3 kg/s
(3)
P3 = 200 kPa
X3 = 90%
(7)
T, = -30°C
sat. liquid
Throttling Valve
-10

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 m₁ enters the turbine at state 1. A portion
of the steam (m₂) exits the turbine at state 2 before passing through the mixing chamber. The remainder
(m3 = 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 me 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.

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