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
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Author:Sadiku, Matthew N. O.
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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.
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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