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. 20PRESSURE, MPa2.1300:-70-60 1250:0.40-50°C-** 0.50-40Saturated Liquid"-301150--200.70-0-0.10.8010:1050-0.900.200'L#1.101.201.30006*0.41.408001.500.6-1.80:1.900.72.100.8-2.202.306'02.402.50Saturated Vapor-20202.8060-0806120s 3.10 kJ/(kg-T = 180°C007000R-3200820.009(difiuoromethane)00LReference state:%3Dh = 200.0 kJ/kg, s= 1.00 kJ/(kg K)for saturated liquid at 0°C009500-800,= 200 kg/m39.15010.8408500,4.40-2200.810.15-100.810'8.00.4-200.66.00.2T=-30°C0.4-403.00.20.1-502.00.081.50.10.080.040.80-7090'00.040.020.403.200.300.020.013.300.2000ENTHALPY, kJ/kgProperties computed with: NIST REFPROP0.01version 7.0009008Based on formulation of Tillner-Roth and Yokozeki (1997)00L

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher: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.

20
PRESSURE, MPa
2.
1300:
-70
-60 1250:
0.40
-50°C-
** 0.50
-40
Saturated Liquid"
-30
1150-
-20
0.70
-0-
0.1
0.80
10:
1050-
0.90
0.2
00'L
#1.10
1.20
1.30
006
*0.4
1.40
800
1.50
0.6
-1.80
:1.90
0.7
2.10
0.8-
2.20
2.30
6'0
2.40
2.50
Saturated Vapor
-20
20
2.80
60-
08
06
120
s 3.10 kJ/(kg-
T = 180°C
007
000
R-32
008
20.
009
(difiuoromethane)
00L
Reference state:
%3D
h = 200.0 kJ/kg, s= 1.00 kJ/(kg K)
for saturated liquid at 0°C
009
500-
8
00,
= 200 kg/m3
9.
150
10.
8
4
08
50
0,
4.
40-
2
20
0.8
10.
15
-10
0.8
10'
8.0
0.4
-20
0.6
6.0
0.2
T=-30°C
0.4
-40
3.0
0.2
0.1
-50
2.0
0.08
1.5
0.1
0.08
0.04
0.80
-70
90'0
0.04
0.02
0.40
3.20
0.30
0.02
0.01
3.30
0.20
00
ENTHALPY, kJ/kg
Properties computed with: NIST REFPROP
0.01
version 7.0
009
008
Based on formulation of Tillner-Roth and Yokozeki (1997)
00L

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