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“NUMERICAL AND EXPERIMENTAL
INVESTIGATION ON AN ADIBATIC CAPIILARRY
TUBE WITH ALTERNATIVE
REFRIGERANTS”
DEPARTMENT OF
MECHANICAL ENGINEERINGGOVT. COLLEGE OF
ENGINEERINGAMRAVATI 444 604
BY-SHREYAS V. LOKHANDEBHUSHAN G. PATIL
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Study Of Refrigerants
Numerical Investigation On A
Capillary Tube
Experimental Setup
Experimental Investigation On A
Capillary Tube.
Conclusion
Scope Of The Project
PROJECT
AGENDA
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Study Of RefrigerantsRefrigeran
tBoiling Point
(°C)Flammability ODP GWP
R12 -29.8 A1 0.82 10600
R22 -41.4 A1 0.034
1700
R32 -51.7 A1 0 550
R134a -26.1 A1 0 1300
R152 -24 A2 0 120
RE170 -24.8 A3 0 1
R600a -11.7 A3 0 20
R290 -42.2 A3 0 20
R125 -54.6 A1 0 3400
R404 -46.6 A1 0 3800
R407 -54.6 A1 0 3900
R410 -51.6 A1 0 1700
Study of refrigerants
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Numerical Investigation
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Fig. Variation of COP vs. evaporator temperature for refrigerant R22, R410, R134a, R152, R32 and R152+R134a
Fig. Variation of refrigerating effect vs. evaporating temperature for refrigerant R22, R410, R134a, R152a, R32 and Mixture R152+ 134a resp.
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Fig. Variation of compressor work w.r.t. evaporating temperature for refrigerant R22, R410, R134a, R152a, R32 and Mixture R152+ 134a resp.
Fig. Variation of Pressure ratio w.r.t evaporating effect for refrigerant R22, R410, R134a, R152a, R32 and Mixture R152+ 134a respectively.
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-15 -10 -5 0 5 10 150
2
4
6
8
10
12R22
R32
R152a
R134
R134a+R152 (50%/50%)
R134a+R152a (70%/30%)
R134+R152 (30%/70%)
evparator temperature ,ºC
CO
P
Refrigerant At -15ºC At -5ºC
R152a 3.193 3.164
R134a -2.614 -1.594
R32 -2.76 -3.031
R134a+R152 (50%/50%)
1.37 1.849
R134a+R152 (30%/70%)
2.756 3.199
R134a+R152 (70%/30%)
-1.134 -0.74
Comparison w.r.t.R22
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Experimental Setup
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Main Components1. Compressor :
2. Fan cooled condenser
3. Rotameter
4. Capillary Tube We have used 4 different types of capillary tubes
d= 0.055inch / 1.397mm , L=0.75m
d=0.064inch / 1.62mm , L=1m
d=0.070inch / 1.778mm , L=1m
d=0.090inch / 2.286mm , L=2m
5. Evaporator.
Other Components Refrigerant used: R22, R410, R134a Compressor oil for R22 and R410 - Mineral oil For R134a - POE oil Energy meters 12 Thermocouples 4 pressure gauges
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Experimental Results
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Fig: Variation of pressure ratio with capillary tube diameter
Fig: Variation of pressure drop with capillary tube diameter
Fig: Variation of mass flow rate with capillary tube diameter
Fig: Variation of refrigerating effect vs. capillary tube diameter
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Figure 4.5: Variation of compressor work w.r.t. Capillary tube diameter
Figure 4.6: Comparison of COP vs. capillary tube diameter
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Fig. Variation of Pressure ratio Fig. Variation of Compressor work
Fig.Variation of COP
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Conclusion R152a refrigerant Is better replacement to R134a
refrigerant in refrigeration and air-conditioning systems
Mass flow rate is highest for R134a when 0.070” capillary is used
COP is approximately same for R134a and R22 on both capillary tubes
Pressure drop & Pressure ratio decreases as capillary diameter increases and is highest in case of R410
Experimental value of COP was less than numerical as losses were not considered in numerical investigation
The results of both experimental and computational are approximate
Hence the computational results are validated with experimental results
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Scope of the project Currently the R22 is used as refrigerant
in the refrigeration systems which as 0.034 ODP and 10600 GWP, so it needs a replacement
R134 and 152a are alternative refrigerants in the refrigeration systems according to our theoretical investigation
Further study can bring out new refrigerants in this field which will serve boon to society
Also good capillary tube designs gives best results on alternative refrigerants
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Referances1) B.O. Bolaji, M.A. Akintunde, and T.O. Falade2) Comparative Analysis of Performance of Three Ozone-Friends HFC Refrigerants in a Vapour
Compression Refrigerator3) Mahmoud Ghodbane 4) An Investigation of R152a and Hydrocarbon Refrigerants in Mobile Air Conditioning5) N. S. N. S .6) Estimation of Possibility of Usage of Quasiazeotropic Mixture R134a/R152a in Refrigerating
Engineering7) A.Baskaran, P.Koshy Mathews8) Thermal analysis of vapour compression refrigeration system with R152a and its blends R429A,
R430A, R431A and R435A9) Pressure drop of pure HFC Refrigerant and their mixture flowing in capillary tubes s.d chand10) Lorentzen G. Revival of carbon dioxide as a refrigerant. Int J Refrig 1994;17:292–300.11) Bansal PK, Rupasinghe AS. A homogeneous model for adiabatic capillary tubes. Appl Thermal Eng
1998;18:207–19.12) Gu B, Li Y, Wang Z, et al. Analysis on the adiabatic flow of R407C in capillary tube. Appl Thermal
Eng 2003;23:1871–80.13) Chen Y, Gu J. Non-adiabatic capillary tube flow of carbon dioxide in a novel refrigeration cycle.
Appl Thermal Eng 2005;25:1670–83.14) Khan MK, Kumar R, Sahoo PK. Flow characteristics of refrigerants flowing through capillary tubes—
a review. Appl Thermal Eng 2009;29:1426–39.15) Park C, Lee S, Kang H, et al. Experimentation and modelling of refrigerant flow through coiled
capillary tube. Int J Refrig 2007;30:1168–75.16) Valladares G. Numerical simulation and experimental validation of coiled adiabatic capillary tubes.
Appl Thermal Eng 2007;27:1062–71.17) Madsen KB, Poulsen CS, Wiesenfarth M. Study of capillary tubes in a transcritical CO2 refrigeration
system. Int J Refrig 2005;28:1212–8.18) Silva DL, Hermes CJL, Melo C, et al. A study of transcritical carbon dioxide flow through adiabatic
capillary tubes. Int J Refrig 2009;32:978–87.19) Hermes CJH, Silva DL, Melo C, et al. Algebraic solution of transcritical carbon dioxide flow through
adiabatic capillary tube. Int J Refrig 2009;32:973–7.20) Agrawal N, Bhattacharyya S. Adiabatic capillary tube flow of carbon dioxide in a transcritical heat
pump cycle. Int J Energy Res 2007;31:1016–30.
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