A vapor-compression refrigeration system with a capacity of 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in the Figure and in the table below. The compression process is internally reversible and can be modeled by pu1.01 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. Determine a) the mass flow rate of refrigerant, in kg/s. b) the power input and the heat transfer rate for the compressor, each in kW. c) the coefficient of performance. d) the mass flow rate of the cooling water, in kg/s. e) the rates of entropy production in the condenser and expansion valve, in kW/K. f) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the compressor power input. Let To = 20°C. State p (bar) 4 12 11.6 4 1 2 3 4 5 6 Ty=44°C Py 11.6 ba 3 E= va

A vapor-compression refrigeration system with a capacity of 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in the Figure and in the table below. The compression process is internally reversible and can be modeled by pu1.01 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. Determine a) the mass flow rate of refrigerant, in kg/s. b) the power input and the heat transfer rate for the compressor, each in kW. c) the coefficient of performance. d) the mass flow rate of the cooling water, in kg/s. e) the rates of entropy production in the condenser and expansion valve, in kW/K. f) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the compressor power input. Let To = 20°C. State p (bar) 4 12 11.6 4 1 2 3 4 5 6 Ty=44°C Py 11.6 ba 3 E= va

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

A vapor-compression refrigeration system with a capacity of
10 tons has Refrigerant 134a as the working fluid. Information
and data for the cycle are provided in the Figure and in the
table below. The compression process is internally reversible
and can be modeled by pu1.01 = constant. The condenser is
water-cooled, with water entering and leaving with a
negligible change in pressure. Heat transfer from the outside
of the condenser can be neglected. Determine
a) the mass flow rate of refrigerant, in kg/s.
b) the power input and the heat transfer rate for the
compressor, each in kW.
c) the coefficient of performance.
d) the mass flow rate of the cooling water, in kg/s.
e) the rates of entropy production in the condenser and
expansion valve, in kW/K.
f)
the rates of exergy destruction in the condenser and
expansion valve, each expressed as a percentage of
the compressor power input. Let To = 20°C.
State p (bar)
1 4
12
11.6
2
3
4
4
5
6
.
T (°C)
15
54.88
44
8.93
20
30
Ty=44°C
Py = 11.6 bar
3
Cooling water
Ts=20°C T6=30°C
h (kJ/kg) s (kJ/kg-K)
0.9348
v (m²/kg)
0.05258
0.01772
0.0008847 112.22
0.01401
258.15
281.33
0.9341
0.4054
112.22
0.4179
83.96
0.2966
125.79
0.4369
immi
Condenser
Expansion
valve
6
Evaporator
4 bar
←m
P₂= 12 bar
Compressor
in = 10 tons
T₁-15°C
1

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Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. State 1 2 3 4 5 6 T₁=44°C P3-11.,6 bar 4 12 T₁=20°C 7₁=30°C T P (bar) (°C) 3 15 11.6 3 Expansion valve 79.95 44 Condenser 20 30 6 Evaporator 0.6709 0.02151 P₂ = 12 bar Compressor U h S (m²/kg) (kJ/kg) (kJ/kg-K) 0.07232 260.8 0.9656 |T₁= 15°C 0.02051 310.2 0.0008847 112.2 82.88 Determine: (a) the mass flow rate of refrigerant, in kg/s. (b) the power input and the heat transfer rate for the compressor, each in kW. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341 (c) the coefficient of performance. (d) the mass flow rate of the cooling water, in…
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