Comparison of half effect absorption-compression cascaded refrigeration system using thermodynamic (energy-exergy) analysis

In the most of industrial processes, the waste heat energy increases production cost. Using this waste heat to produce power or cooling can decrease the costs and increases the thermo-economic efficiency of the industrial systems. A growing need for refrigeration in industry due to demands of higher living standards, the increasing requirements for comfort, and the increasing thermal load a half effect, single & double effect and triple effect LiBr-H2O vapour absorption refrigeration systems provide very good efficiency for cooling up to 00C temperature . The energy-exergy analysis in the vapour absorption and compression systems helped to find out the major loss incurring component. In order to reduce those losses many attempts has been made so that first law efficiency (COP) of the vapour absorption refrigeration system cascaded with vapour compression cycle can be increased. It is found that the thermodynamic performances in the case of cascaded half effect vapour absorption refrigeration system coupled with vapour compression cycle is improved by 44.65% increment of first law efficiency ( i.e. over all COP), 172.867% increment of second law efficiency ( i.e. exergetic efficiency ) of the half effect vapour absorption refrigeration cascaded with vapour compression cycle using HFC-134a, 42.867% enhancement in first law efficiency (COP) of 142.7267% increment of second law efficiency using HFO -1234yf for -50oC of evaporator temperature of VCRS . Similarly 72.024% reduction in exergy destruction ratio based on exergy of output of the half effect vapour absorption refrigeration cascaded with vapour compression cycle using HFC-134a and 70.44% reduction in exergy destruction ratio using HFO-1234yf ecofriendly refrigerant for -50oC of evaporator temperature of VCRS. The performances of single effect cascaded vapour absorption refrigeration system coupled with vapour compression cycle significantly higher than cascaded half effect vapour absorption refrigeration coupled with vapour compression cycle.


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S.No,1
Refrigerant
COP_Over_alll
EDR_Overall
Exergetic Efficiency
1
R134a
2.151
1.421
0.4131
2
R1234ze
2.148
1.429
0.4116
3
R1234yf
2.131
1.469
0.4050
4
R227ea
2.10
1.543
0.3933
5
R236fa
2.135
1.459
0.4067
6
R245fa
2.168
1.382
0.4198
7
R32
2.139
1.448
0.4084
8
R507a
2.113
1.510
0.3984
9
R717
2.154
1.414
0.4142
10
R123
2.179
1.357
0.4242
11
R125
2.087
1.574
0.3885
12
R152a
2.169
1.380
0.4202
13
R404a
2.098
1.547
0.3926
14
R410a
2.142
1.442
0.4095
15
R407c
2.034
1.712
0.3687
16
R744
1.993
1.827
0.3537
17
R290
2.147
1.430
0.4115
18
R600
2.167
1.385
0.4194
19
R600a
2.148
1.425
0.4124
20
R141b
2.196
1.321
0.4309
21
R143a
2.12
1.495
0.4008





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