A vapor-compression refrigerator operates as in the right figure using CO₂ as refrigerant. The evaporation is at -10 °C and the condensation is at 20 °C. The efficiency of the compressor is 0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H diagram below, (a) Estimate the power requirement, the heat transfer rate in the condenser, and the circulation rate of CO2. (b) Estimate the coefficient of performance. (c) Sketch the cycle in the P-H diagram (as accurate as possible). Pressure Entropy [kJ/kg.K] 1.0 20 MPa 18 MPa 15 MPa 13 MPa 10 MPa 9 MPa 8 MPa 7 MPa 6 MPa 5 MPa 4 MPa 3.5 MPa 3MPa 2.5 MPa 2MPa 150 -10°C 0°C P-h diagram for Carbon Dioxide Refrigerant [R744] 1.2 1.3 1.4 1.5 1.1 1.6 10 °C 200 20 °C 30 °C 40 °C سال اگر 1.7 1.8 100 C 120 C 50 °C 60°C 70°C 80 °C 90 °C 250 volume [m³/kg]. 10% 20% 30% 40% 50% 60% 70% 80% 90% 0.002: 300 0.003 0.004 350 Enthalpy (kJ/kg) 400 0.006 450 Throttle valve 4 -0.008 0.01 Condenser 500 1.9 2.0 140 C 160 C 180 C Evaporator Compressor 550 3 plot by izzi 2 2.1 600
A vapor-compression refrigerator operates as in the right figure using CO₂ as refrigerant. The evaporation is at -10 °C and the condensation is at 20 °C. The efficiency of the compressor is 0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H diagram below, (a) Estimate the power requirement, the heat transfer rate in the condenser, and the circulation rate of CO2. (b) Estimate the coefficient of performance. (c) Sketch the cycle in the P-H diagram (as accurate as possible). Pressure Entropy [kJ/kg.K] 1.0 20 MPa 18 MPa 15 MPa 13 MPa 10 MPa 9 MPa 8 MPa 7 MPa 6 MPa 5 MPa 4 MPa 3.5 MPa 3MPa 2.5 MPa 2MPa 150 -10°C 0°C P-h diagram for Carbon Dioxide Refrigerant [R744] 1.2 1.3 1.4 1.5 1.1 1.6 10 °C 200 20 °C 30 °C 40 °C سال اگر 1.7 1.8 100 C 120 C 50 °C 60°C 70°C 80 °C 90 °C 250 volume [m³/kg]. 10% 20% 30% 40% 50% 60% 70% 80% 90% 0.002: 300 0.003 0.004 350 Enthalpy (kJ/kg) 400 0.006 450 Throttle valve 4 -0.008 0.01 Condenser 500 1.9 2.0 140 C 160 C 180 C Evaporator Compressor 550 3 plot by izzi 2 2.1 600
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 vapor-compression refrigerator operates as in the right figure
using CO₂ as refrigerant. The evaporation is at -10 °C and the
condensation is at 20 °C. The efficiency of the compressor is
0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H
diagram below,
(a) Estimate the power requirement, the heat transfer rate in
the condenser, and the circulation rate of CO₂.
(b) Estimate the coefficient of performance.
(c) Sketch the cycle in the P-H diagram (as accurate as possible).
Pressure
Entropy [kJ/kg.K] 1.0
20 MPa
18 MPa
15 MPa
13 MPa
10 MPa
9 MPa
8 MPa
7 MPa
6 MPa
5 MPa
4 MPa
3.5 MPa
3 MPa
2.5 MPa
2 MPa
150
-10°C
0°C
200
P-h diagram for Carbon Dioxide Refrigerant [R744]
1.2 1.3
1.7
1.1
1.4
1.5
1.6
100 °C
80 °C 90 °C
10 °C
20 °C
30 °C 40 °C
50 °C 60 °C 70°C
250
volume
[m³/kg].
10% 20% 30% 40% 50% 60% 70% 80%
0.002:
300
0.003
350
Enthalpy (kJ/kg)
0.004
90%
400
0.006
450
1.8
120 °C
Throttle
valve
4
-0.008
0.01
Condenser
500
2.0
1.9
140 C 160 C 180 C
Compressor
Evaporator
550
2
2.1
plot by izzi
2.2
600](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F45a008ed-7b5c-4385-ae8e-6c254084b918%2F0a9d86a2-2ddf-464d-b493-2e5f00795284%2F1f1mz1s_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A vapor-compression refrigerator operates as in the right figure
using CO₂ as refrigerant. The evaporation is at -10 °C and the
condensation is at 20 °C. The efficiency of the compressor is
0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H
diagram below,
(a) Estimate the power requirement, the heat transfer rate in
the condenser, and the circulation rate of CO₂.
(b) Estimate the coefficient of performance.
(c) Sketch the cycle in the P-H diagram (as accurate as possible).
Pressure
Entropy [kJ/kg.K] 1.0
20 MPa
18 MPa
15 MPa
13 MPa
10 MPa
9 MPa
8 MPa
7 MPa
6 MPa
5 MPa
4 MPa
3.5 MPa
3 MPa
2.5 MPa
2 MPa
150
-10°C
0°C
200
P-h diagram for Carbon Dioxide Refrigerant [R744]
1.2 1.3
1.7
1.1
1.4
1.5
1.6
100 °C
80 °C 90 °C
10 °C
20 °C
30 °C 40 °C
50 °C 60 °C 70°C
250
volume
[m³/kg].
10% 20% 30% 40% 50% 60% 70% 80%
0.002:
300
0.003
350
Enthalpy (kJ/kg)
0.004
90%
400
0.006
450
1.8
120 °C
Throttle
valve
4
-0.008
0.01
Condenser
500
2.0
1.9
140 C 160 C 180 C
Compressor
Evaporator
550
2
2.1
plot by izzi
2.2
600
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