Post on 21-Dec-2015
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Modelling & Simulated Performance of Finned Tube Air Cooled Condenser Using
R290 as Substitute for R22
Mr. Innus Ganechari Mr. Niyaj Shikalgar
Dr. S.N. Sapali
Department of Mechanical Engineering,College of Engineering, Pune
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Introduction
A mathematical model has been formulated to predict the
influence of high outdoor air temperature on the performance of
condenser for air-conditioning system using R22 and alternative
refrigerants R290.
The outdoor ambient air temperature was varied from 300C to
500C due to which condenser temperature increases.
The study showed that R290 (Propane) is the best replacement for
R22 (HCFC22) when the air conditioning system works under high
ambient temperature because the compressor discharge
temperature is reduced, refrigerant charge required minimum and
COP is increased.
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Continued
The goal of simulated results was to assess the impact of the
condenser performance on the COP for different ambient
temperatures.
In this model, a comparative performance of R22 and its
alternatives R290 were determined theoretically and simulation in
an attempt to examine the possibility of substituting R290 in
residential air conditioners used in summer hot climate.
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CoolPack Simulation ResultsRefrigerant Temp
0CPressureKg/cm2
Mass flow rate LPH
PowerkW
COP
R290 50 17.236 79 1.395 3.781
52 17.984 81 1.487 3.548
54 18.755 83 1.583 3.333
56 19.55 85 1.683 3.135
58 20.163 87 1.787 2.952
60 21.217 89 1.896 2.782
R22 50 19.635 138 1.374 3.841
52 20.548 140 1.461 3.612
54 21.49 143 1.551 3.402
56 22.46 146 1.645 3.208
58 23.21 149 1.742 3.029
60 24.515 152 1.843 2.863
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R22 Simulation Results
48 50 52 54 56 58 60 620
0.5
1
1.5
2
2.5
3
3.5
4
Condenser Temperature (°C)
CO
P/P
ow
er/
Dry
ne
ss f
racti
on
•As condenser temperature increase from 50 to 600C power consumption increased by 26.42% for R-290 & 21.87% for R-22.•As condenser temperature increase dryness fraction after expansion reduced by 23.68% for R-290 & 21.87% for R-22.
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R290 Simulation Results
48 50 52 54 56 58 60 620
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Condenser Temperature (°C)
CO
P/P
ow
er/
Dry
ne
ss f
racti
on
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Mass Flow Rate and Condenser Temperature Variation for R22 & R290
48 50 52 54 56 58 60 620
20
40
60
80
100
120
140
160
R22R290
Condenser Temperature Variation (°C)
Mass fl
ow
rate
(kg
/hr)
As the condenser temperature increase mass flow rate of refrigerant increase by 11.24% for R-290 & 19.90% for R-22
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Performance Comparison of R290 & R22
1 2 3 4 5 60
0.5
1
1.5
2
2.5
3
3.5
4
4.5
R22R290
Various Condenser Temperature
CO
P
COP of R290 is up to 12% higher than R22 under various condenser temperature conditions
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Conclusion
COP of R290 is up to 12% higher than R22 under various
condenser temperature conditions
Compressor discharge temperature of R290 was 30% lower
than R22 under various condenser temperature conditions.
This indirectly indicates that fluids would show long term
stability and reliability
The refrigerant charge for R-290 system is reduced by 57%
compared to R22 system for the same operating conditions.
The performance of R290 system is better than that of R22
system for same operating conditions
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References[1] A. Padalkara, K. Mali , S. Devottac, Simulated performance of R-290 in air
conditioner, in : he 23 rd international congress refrigeration, Czech republic,
August 2011.
[2] D. Jung, Y. Song and B. Park, Performance of HCFC22 alternative refrigerants, Int.
J. Refrigeration. 23(6) (2000) 466-474.
[3] Dobson MK Chato JC. Condensation in smooth horizontal tubes, J Heat transfer,
ASME 1998;120:193-213.
[4] Wang, C.C., Lee, C.J., Chang, C.T. and Chang Y.J., 1999. “Some Aspects of Plate fin
and tube heat exchanger with or without louvers” J. Enhanced heat transfer , Vol.
6,no.5, pp.357-368.
[5] International Journal of Engineering Research & Technology (IJERT) Vol.2 Isuue 1,
January-2013 ISSN:2278-0181.
[6] Fundamental of Heat & Mass Transfer 7 Edition by Theodore L. Bergman,
Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt