A Cascade refrigeration system using flash tank and intercooler is operating an evaporator with a capacity of 6 tons at a temperature of -30°C. The flash tank and intercooler is operated at 0.40 MPa. If the condensing temperature is 50°C, determine the COP and the refrigerating efficiency of the system. Draw the schematic diagram of the system and assume ideal conditions. Using R-32 p-h chart
A Cascade refrigeration system using flash tank and intercooler is operating an evaporator with a capacity of 6 tons at a temperature of -30°C. The flash tank and intercooler is operated at 0.40 MPa. If the condensing temperature is 50°C, determine the COP and the refrigerating efficiency of the system. Draw the schematic diagram of the system and assume ideal conditions. Using R-32 p-h chart
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 Cascade refrigeration system using flash tank and intercooler is operating an evaporator with a capacity of 6 tons at a temperature of -30°C. The flash tank and intercooler is operated at 0.40 MPa. If the condensing temperature is 50°C, determine the COP and the refrigerating efficiency of the system. Draw the schematic diagram of the system and assume ideal conditions.
Using R-32 p-h chart
![100
20
200
300
400
500
R-32
600
700
800
20.
(difluoromethane)
10
Reference state:
h = 200.0 kJ/kg, s= 1.00 kJ/(kg K)
for saturated liquid at 0°C
8
700
600 -
500-
400
300
= 200 kg/m3
6
150
10.
4
8
100
80
60
50
60
2
4
40
40
30
30
20
1
0.8
10
20
0.6
15
1
-10
0.4
10
0.8
8.0.
-20
0.6
6.0
0.2
T=-30°C
0.4
Il 4 4.0
-40
3.0
0.1
0.2
0.08
-50
2.0
0.06
1.5
-60
0.1
0.04
1.0
0.08
0.80
0.06
-70
0.60
0.02
0.04
0.40
-80
3.20
0.30
0.01
0.02
3.30
0.20
100
200
300
Properties computed with: NIST REFPROP
400
500
600
0.01
800
version 7.0
ENTHALPY, kJ/kg
700
Based on formulation of Tillner-Roth and Yokozeki (1997)
PRESSURE, MPa
-80 1300
-70
1250:
09-
0.40
* 0.50
40-
-30
Saturated Liquid
--1150-
-0.70
-20
0.1
-10
0.80
1100
0.90
도0.2.
10,
1050-
1000:
1.10
0.3
1.20
1.30
x30.4
1.40
006
1.50
#0.5
00-
0.6
0.7
- 2.10
...
0.8
2.20
-2.30
0.9
- 2.40
2.50
Saturated Vapor
2.60
-20
2.80
60-
06
08
120
= 3.10 kJ/(kg-
140
T= 180°C
007
2.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0ed7eb17-79f1-44e5-8945-3367803e96b6%2Fd308e74f-3b75-45f5-8b9f-0ba29564b226%2Fx1cmhqc_processed.png&w=3840&q=75)
Transcribed Image Text:100
20
200
300
400
500
R-32
600
700
800
20.
(difluoromethane)
10
Reference state:
h = 200.0 kJ/kg, s= 1.00 kJ/(kg K)
for saturated liquid at 0°C
8
700
600 -
500-
400
300
= 200 kg/m3
6
150
10.
4
8
100
80
60
50
60
2
4
40
40
30
30
20
1
0.8
10
20
0.6
15
1
-10
0.4
10
0.8
8.0.
-20
0.6
6.0
0.2
T=-30°C
0.4
Il 4 4.0
-40
3.0
0.1
0.2
0.08
-50
2.0
0.06
1.5
-60
0.1
0.04
1.0
0.08
0.80
0.06
-70
0.60
0.02
0.04
0.40
-80
3.20
0.30
0.01
0.02
3.30
0.20
100
200
300
Properties computed with: NIST REFPROP
400
500
600
0.01
800
version 7.0
ENTHALPY, kJ/kg
700
Based on formulation of Tillner-Roth and Yokozeki (1997)
PRESSURE, MPa
-80 1300
-70
1250:
09-
0.40
* 0.50
40-
-30
Saturated Liquid
--1150-
-0.70
-20
0.1
-10
0.80
1100
0.90
도0.2.
10,
1050-
1000:
1.10
0.3
1.20
1.30
x30.4
1.40
006
1.50
#0.5
00-
0.6
0.7
- 2.10
...
0.8
2.20
-2.30
0.9
- 2.40
2.50
Saturated Vapor
2.60
-20
2.80
60-
06
08
120
= 3.10 kJ/(kg-
140
T= 180°C
007
2.
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