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4th INTERNATIONAL CONFERENCE ON
ADVANCES IN ENERGY RESEARCH
Indian Institute of Technology Bombay, Mumbai
10-12 December 2...
INTRODUCTION
Combined cycle
 Combination of Rankine cycle and absorption
refrigeration cycle which produces power and
coo...
SINGLE STAGE ABSORPTION
COOLING AND POWER CYCLE
TWO STAGE ABSORPTION
COOLING AND POWER CYCLE
QSH
SH

QR3

25

28

QR2

24

R3
27

T

R2

P

23

22

30

G2
QC

29
C

QR1
1...
THERMODYNAMIC ANALYSIS ASSUMPTIONS
•

The system operates under steady state
conditions.

•

Pump work and the frictional ...
THERMODYNAMIC ANALYSIS ASSUMPTIONS
• The effectiveness of solution heat
exchanger(s) is 0.75 and the temperature of
super ...
THERMODYNAMIC ANALYSIS ASSUMPTIONS
• Mass flow rate of the weak solution from the
absorber to the generator is 1 kg/s.
• T...
PERFORMANCE ANALYSIS - EQUATIONS
Single stage combined cycle
QA = m6 h6 + m13 h13 + m16 h16 - m1 h1
QC = m10(h10 - h11)
QE...
PERFORMANCE ANALYSIS - EQUATIONS
QSHX = m3(h3 - h2)
QSH = m15(h15 - h14)
PT = m15 (h15 - h16)
CR = (Xr - Xss) / (Xws - Xss...
PERFORMANCE ANALYSIS - EQUATIONS
Two stage combined cycle
QA1 = m6h6 + m26m26h26 - m1h1
QC = m10(h10 - h11)
QE = m13(h13 -...
PERFORMANCE ANALYSIS - EQUATIONS
PT = m28 (h28 - h29)
QA2 = m15h15 + m21h21 + m29h29 - m16h16
QR2 = m22h22 - m23h23 - m24h...
PERFORMANCE ANALYSIS - EQUATIONS
QSH = m28(h28- h27)

CR1 = (Xr1 - Xss1)/ (Xws1 - Xss1)
CR2 = (Xr3 - Xss2)/ (Xws2 - Xss2)
...
COOLING CAPACITY Vs
ABSORBER TEMPERATURE
POWER OUTPUT Vs
ABSORBER TEMPERATURE
COEFFICIENT OF PERFORMANCE Vs
ABSORBER TEMPERATURE
EFFECTIVE FIRST LAW EFFICIENCY Vs
ABSORBER TEMPERATURE
COOLING CAPACITY Vs
CONDENSER TEMPERATURE
POWER OUTPUT Vs
CONDENSER TEMPERATURE
COEFFICIENT OF PERFORMANCE Vs
CONDENSER TEMPERATURE
EFFECTIVE FIRST LAW EFFICIENCY Vs
CONDENSER TEMPERATURE
COOLING CAPACITY Vs
EVAPORATOR TEMPERATURE
POWER OUTPUT Vs
EVAPORATOR TEMPERATURE
COEFFICIENT OF PERFORMANCE Vs
EVAPORATOR TEMPERATURE
EFFECTIVE FIRST LAW EFFICIENCY Vs
EVAPORATOR TEMPERATURE
CONCLUSION
Cooling capacity and Power output of single
stage cycle is higher than that of a two stage
cycle.
Coefficient o...
THANK YOU
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  1. 1. 4th INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY RESEARCH Indian Institute of Technology Bombay, Mumbai 10-12 December 2013 ENERGY ANALYSIS OF SINGLE AND TWO STAGE ABSORPTION COOLING AND POWER CYCLES Dr.C.P.Jawahar Associate Professor Department of Mechanical Engineering Karunya University Coimbatore - 641 114, India 1
  2. 2. INTRODUCTION Combined cycle  Combination of Rankine cycle and absorption refrigeration cycle which produces power and cooling simultaneously with a single heat source  Employs binary ammonia-water working fluid such Advantages of ammonia-water • Good thermo-physical properties • Environment friendly as
  3. 3. SINGLE STAGE ABSORPTION COOLING AND POWER CYCLE
  4. 4. TWO STAGE ABSORPTION COOLING AND POWER CYCLE QSH SH QR3 25 28 QR2 24 R3 27 T R2 P 23 22 30 G2 QC 29 C QR1 14 10 9 18 7 R1 G1 QA2 8 3 11 4 SHX1 2 EV PRV1 SP1 1 12 13 E 26 6 A1 QE 15 19 SHX2 17 20 PRV2 SP2 5 QA1 QG2 16 21 A2
  5. 5. THERMODYNAMIC ANALYSIS ASSUMPTIONS • The system operates under steady state conditions. • Pump work and the frictional pressure drop in the cycle are neglected except through the expansion valve. • The weak solution leaving the absorber(s), strong solution leaving the generator(s) and the refrigerant at the outlet of condenser and evaporator are saturated. • The concentration of the refrigerant leaving the rectifier(s) R1 and R3 is 0.999.
  6. 6. THERMODYNAMIC ANALYSIS ASSUMPTIONS • The effectiveness of solution heat exchanger(s) is 0.75 and the temperature of super heater is 200°C. • Split ratio (S) is assumed to be 0.75. • The degassing width in the single stage cycle is assumed as 0.10, while the degassing width in the first and second stage of the two stage cycle is assumed to be 0.04 and 0.06 respectively.
  7. 7. THERMODYNAMIC ANALYSIS ASSUMPTIONS • Mass flow rate of the weak solution from the absorber to the generator is 1 kg/s. • Temperature of the weak solution leaving the second stage absorber is 0.10°C higher than the temperature of the strong solution leaving the first stage generator. • Mass flow rate of the refrigerant vapour leaving the first stage rectifier is same as that of the one entering the second stage rectifier and first stage absorber.
  8. 8. PERFORMANCE ANALYSIS - EQUATIONS Single stage combined cycle QA = m6 h6 + m13 h13 + m16 h16 - m1 h1 QC = m10(h10 - h11) QE = m13(h13 - h12) QG = m4h4 + m7h7 - m3h3 - m8h8 QR = m7h7 - m8h8 - m9h9
  9. 9. PERFORMANCE ANALYSIS - EQUATIONS QSHX = m3(h3 - h2) QSH = m15(h15 - h14) PT = m15 (h15 - h16) CR = (Xr - Xss) / (Xws - Xss) COP = QE/QG
  10. 10. PERFORMANCE ANALYSIS - EQUATIONS Two stage combined cycle QA1 = m6h6 + m26m26h26 - m1h1 QC = m10(h10 - h11) QE = m13(h13 - h12) QR1 = m7h7 - m8h8 - m9h9 QSHX1 = m3(h3 - h2)
  11. 11. PERFORMANCE ANALYSIS - EQUATIONS PT = m28 (h28 - h29) QA2 = m15h15 + m21h21 + m29h29 - m16h16 QR2 = m22h22 - m23h23 - m24h24 QR3 = m24h24 - m25h25 - m30h30 QSHX2 = m18(h18 - h17)
  12. 12. PERFORMANCE ANALYSIS - EQUATIONS QSH = m28(h28- h27) CR1 = (Xr1 - Xss1)/ (Xws1 - Xss1) CR2 = (Xr3 - Xss2)/ (Xws2 - Xss2) COP = QE/QG2
  13. 13. COOLING CAPACITY Vs ABSORBER TEMPERATURE
  14. 14. POWER OUTPUT Vs ABSORBER TEMPERATURE
  15. 15. COEFFICIENT OF PERFORMANCE Vs ABSORBER TEMPERATURE
  16. 16. EFFECTIVE FIRST LAW EFFICIENCY Vs ABSORBER TEMPERATURE
  17. 17. COOLING CAPACITY Vs CONDENSER TEMPERATURE
  18. 18. POWER OUTPUT Vs CONDENSER TEMPERATURE
  19. 19. COEFFICIENT OF PERFORMANCE Vs CONDENSER TEMPERATURE
  20. 20. EFFECTIVE FIRST LAW EFFICIENCY Vs CONDENSER TEMPERATURE
  21. 21. COOLING CAPACITY Vs EVAPORATOR TEMPERATURE
  22. 22. POWER OUTPUT Vs EVAPORATOR TEMPERATURE
  23. 23. COEFFICIENT OF PERFORMANCE Vs EVAPORATOR TEMPERATURE
  24. 24. EFFECTIVE FIRST LAW EFFICIENCY Vs EVAPORATOR TEMPERATURE
  25. 25. CONCLUSION Cooling capacity and Power output of single stage cycle is higher than that of a two stage cycle. Coefficient of performance and Effective first law efficiency of the two stage cycle is found to vary between 21 to 66% and 20 to 60% respectively, more than the single stage cycle. It is also observed that the two stage combined cycle could effectively utilize a high temperature heat source than the single stage one.
  26. 26. THANK YOU
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