parishodh journal issn no:2347-6648 experimental …
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EXPERIMENTAL ANALYSIS OF VAPOUR COMPRESSION
REFRIGERATION SYSTEM WITH LPG/ SIO2/ POE OIL IN DOMESTIC
REFRIGERATOR WITH VARIED LENGTH OF CAPILLARY TUBE
Brijesh Kumar Singh1, Dr. Ajay Singh
2, Ramnarayan Sahu
3
1M.E. Scholar, Mechanical Engineering, Radharaman Institute of Technology and Science,
Bhopal, M.P. 2Professor and Head, Department of Mechanical Engineering, Radharaman Institute of
Technology and Science, Bhopal, M.P. 3Assistant Professor, Department of Mechanical Engineering, Radharaman Institute of
Technology and Science, Bhopal, M.P.
ABSTRACT
Present study on experimental investigations into the performance of experimental analysis of
vapour compression refrigeration system with liquid petroleum gas (LPG)/ Silicon oxide
(SiO2)/Polyol ester oil (POE) in domestic refrigerator with varied length of capillary tube.
Performance of the refrigeration system depends upon the various factors like; performance of
refrigeration system’s components, nature and properties of the refrigerant being used,
environmental conditions etc. At the initial condition refrigeration system contain R134a
refrigerant, polyester oil (POE) and 2.4 m capillary tube length, in the system capillary tube
having length 2.4 m. and in the next stage, R134a is preplaced with liquid petroleum gas
(LPG), polyol ester oil (POE) is replaced with nano lubricant (.2g/l SiO2 + POE) and used
three different capillary tube length (2.4 m, 2.7 m, 3.0) separately. It is found that the best
results come from capillary tube of 2.7 m length with system loaded nano lubricant (N. L.) and
liquid petroleum gas (LPG) refrigerant. Then also the power consumption of the system
reduced by 8.8%, refrigeration capacity of the system and coefficient of performance increased
by 12.6% and 22.73% respectively, and temperature of evaporator are reduced by 44.44%, and
also pressure ratio are reduced by 11.14%.
Keywords: Power consumption, refrigeration capacity, coefficient of performance (COP),
evaporator temperature, pressure ratio, Nano lubricant (N. L.), liquid petroleum gas (LPG).
1.0 INTRODUCTION
Refrigeration is classified as the process of extracting heating from a source, substance or
cooling medium of a lower temperature heat source and moving it to a heat sink of a higher
temperature. Refrigeration holds the heat source temperature below the ambient temperature
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when passing the collected heat and any required energy supply to a heat sink, ambient air or
surface water. A refrigeration system is a combination of components and equipment connected
in a sequential order to produce the refrigeration effect. In The VCRS improve the cooling
effect and COP and decrease the power input to use the variable length of capillary tube and use
the nano lubricants and LPG (hydrocarbon) to improve the working performance of the vapour
compression refrigeration system. Use the nano lubricant to improve the stability, durability
suspension, less coagulation and natural chemical reaction, to improve the performance
compressor and power input decrease by using nano partials blind with POE lubricant. And use
the different length of capillary tube and refrigeration like to improve the refrigeration effects
and provided lower temperature of evaporator.
2.0 METHODS AND MATERIAL
2.1 Literature Review
D.S Adelekan et al. [1] were once investigated the performance of the iso butane driven
domestic refrigerator infused with a range of concentrations of graphene based nano lubricants.
All nano lubricants combos infused into the rig attained at least -30C submitting cabinet at
steady country aside from 70g R600a using 0g/L blend. Development in volumetric
refrigerating ability performance with growing graphene concentration was once considered
solely at 40g mass of R600a and higher at 50, 60, and 70g R600a then baseline lubricants. Said
to be 4.59- 5.22. The energy consumption of the machine with the chosen graphene base nano
lubricants was higher at R600a and lower 50, 60 and 70g R600a in comparison with the
baseline lubricant.
O.E Atiba et al. [2] the existing studied pursuits to analyze the overall performance of the
domestic refrigerator infused with mass (40g) of R600a refrigerant and various concentrations
of TiO2 nano lubricants that the device worked safely with the favored concentrations and
expanded both the vigorous and cooling performances. The other findings viewed with the
evaluated performance; The suggest strength consumption of the system were lower by using
about 6.2 percentage for .2g/L lubricant than baseline (0g/L) lubricant and extended via 8.87 %
and .92% for .4g/L and .6g/L lubricants.The utilization of TiO2 primarily based nano lubricants
awareness of the nano particles .2, .4 and .6g/L inside the device gave higher mean power per
ton of refrigeration values than baseline lubricant.The suggest discharge temperature of the test
rig with TiO2 based nano lubricants with the concentration of .2, .4, .6, g/L had been very
higher then baseline lubricant through about 6-24%.The coefficient of performance of the test
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rig with TiO2 based totally nano lubricants have been surprisingly lower then 0g/L through
about 1.33-9.33%. In summary, the utilization of nanotechnology on my own mass prices of
R600a in domestic refrigerators
T.O. Babarinde et al. [3]in this paper investigating the impact of TiO2 nano lubricant on the
performance of R600a in the domestic vapour compression refrigeration system. The following
end result used to be come;The decrease evaporator air temperature was done in the device the
use of TiO2 nano lubricant in contrast to the base fluid with .4g/L nano lubricant awareness
providing the lowest evaporator air temperature.Higher COP was bought in R600a of nano
lubricant compared to the R134a and R600a in the primarily based lubricant in the system with
R600a in nano lubricant of .4 g/L nano lubricant awareness having the easiest COP in the
system.A minimize in power consumption was once obtained at some point of using TiO2 nano
lubricant.The thermal conductivity of the gadget was ones increased with TiO2 nano lubricant
in the system.R600a in TiO2 nano lubricant affords higher overall performance in contrast to
R134a and R600a in the based lubricant in the course of the experiment.
S.O. Oyedepo et al. [4] this paper performance parameter of home fridge the usage of LPG and
R600a refrigerants have been evaluated experimentally in phrases of the cooling capacity,
energy per ton of refrigerants, pressure ratio, pull down time, and the coefficient of performance
through varying the capillary tube length and refrigerant cost at a temperature of 320C. After
the successful investigation of these refrigerants, the following conclusions have been drawn
based on the consequences obtained from the study. The average coefficient of overall
performance (COP) of LPG is higher than that of R600a by means of about 1.14%.The common
energy per ton of refrigerant for R600a is about 20% lower than that of LPG.The cooling
capacity of LPG is about 1.59% greater than that of R600a below the same environmental
condition. Pressure ratio of R600a is about 10.12% higher than that of LPG. The device the
usage of LPG has a particularly low pressure ratio than R600a, which show better device
performance and reliability of the gadget the use of LPG.
Luke O. Ajukaet al. [5] the experimental study about investigated the energy and exergy overall
performance of a residential refrigerator using eco friendly hydrocarbon refrigerants like LPG
and R600a in LPG is the mixture of propane (R290) 50% and iso butane (R600a) 50% at the
different concentration of TiO2 nano particles and the lubricant, and make the blind like 0,.05,
.15 and .3 g/L of lubricant and the size of nano particles is used 15nm, this is all composition is
used in the refrigeration system to the replacement of R134a. Use nano lubricants TiO2 .15g/L
with LPG and TiO2 .15g/L with R600a have the best performance and average is 27.6% and
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14.3% greater COP, 34.6% and 35.15% of power consumption is reduced.
Jatinder Gill et al. [6] vigorous and exertional overall performance analysis of the domestic
refrigerator using R134a and LPG refrigerant with precise lubricants polyol eater (POE),
mineral oil ant TiO2, SiO2, Al2O3 nano particles dispersed in mineral oil have been investigated.
Domestic refrigerator lively and exertional performance evaluation had been investigated with
take a look at parameters like compressor strength consumption, cooling power, COP, discharge
temperature, factor irreversibility, entire irreversibility and efficiency of the second low.
Finding showed that the lowest compressor energy consumption and total irreversibility was
once stated in the 40g LPG/ TiO2 – mineral oil lubricant (.2g/L TiO2); these compressor power
consumption and whole irreversibility values are 15.87% and 31.69%, respectively, decrease
than the R134a/POE lubricant. In comparison, the home refrigerator with 40g TiO2 and Mineral
oil with .2g/L lubricant utilizing LPG refrigerant had the satisfactory COP and second low
performance amongst the nano lubricants picked.
Olayinka S. Ohunakin et al. [7] When add nano particles with mineral oil lubricant and make
the nano lubricants then gave 13 and 12% reduction value in electricity consumptions than the
base refrigerant (LPG), whereas increased power consumption of the refrigerator device used to
be as soon as observed with utilization of Al2O3 lubricant when in contrast with base refrigerant
(LPG). Uses of nano particles in refrigeration system used to be located to increase the
performances of the system, however TiO2 observed to thru SiO2 will hydrocarbon refrigerant
having led to excessive power consumption.
P.O. Babalola et al. [8] in this paper COP is 4.8 was bought the usage of LPG was 1.14%
greater than of R600a and 15.09% greater than of R12. When use of R600a then power
consumption in very low. The compressor is 20% less energy consumed when LPG is used and
32% less energy than R12 in the system. In this results when LPG use as a refrigerant then COP
and cooling effect is best results was given, and Use of R600a than power consumption result is
best. This shows that each LPG and R600a can be used as alternative for R12 in domestic
fridge.
Amrat kumar dhamneya et al. [9] The increasing accumulation of nano particles (TiO2) in
refrigerant improves system performance due to reduced compressor work performed and
raises the speed of heat transfer. For hot and dry environmental conditions, air cooled
condenser output is reduced and minimized. COP decreases significantly in chillers owing to
reductions in the condenser's heat transfer speed. The experimental experiments showed a
significant improvement in the performance characteristics of the evaporative cooled
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condenser. In the hot and dry climate conditions, the peak COP rises by about 51 percent
compared to the normal process.
S.O. Oyedepo et al. [10] He used R600a by replicating R12 in his experiment and varied the
length of the capillary tube to get different results. First of all, it took Tube's length L = 1.2m
and the results were taken by taking 60g of refrigerant R600a. Like different capillary tube
lengths and used refrigerant, mass and took R600a in refrigerant so that the results are very
good, including power consumption, COP, refrigeration Effect, pull-down time, the All
Properties Improve. Following results are come in this experiment. Pull down time of
refrigeration was decrease when R600a refrigerant used, as R12 used to take more time than
R600a for cooling. COP of refrigeration system is obtained 6.3% more when use R600a
compare to R12. When R600a refrigerant sue then power consumption will decrease about 24%
compare to R12 refrigerant.
2.2 Experimental Details
2.2.1Experimental setup
In this experiment, we were provided a test rig by my college Radharaman Institute of
Technology Bhopal. The test rig that has been done in this experiment has a lot of major
components like compressor, condenser, evaporator expansion device and many more. The
compressor used in this project is bigger in size and consumes 450W power compared to other
compressors more power consumed and 800mL of lubricant has been used. This type of
compressor is used in water cooling. The second device in the test rig is the condenser, whose
job is to exclude the heat from the refrigerant released from the compressor; my project has a
forced convection type condenser which works well in a low area. The other part expansion
device is decreases both the pressure and temperature, it has a two type first is thermostatic
expansion valve and the second is the capillary tube, which is intended to work only for both
the pressure and the temperature, my project has three tubes. The first one is 2.4m and the
second is 2.7m and third is 3.0m, which gives us different results, and we get the best result in
capillary tube with 2.7 m. The other part is the evaporator which takes heat from the water tank
and releases it into the atmosphere; its diameter is from .5 to 1 cm. All the major components
given above are refrigerators. Many components come in small components, the first of which
is a rota meter whose job is to measure the discharge; it can measure from 0 to 65 l/h. The
second component is pressure gauge, this whole system has two pressure gauges, the first one
measure the suction pressure and the second one is the discharge pressure. Both pressure gauges
have units in lb/ in2.
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1. Compressor
2. Condenser
3. Capillary tube
4. Evaporator
5. Flow control valve
6. Suction pressure
7. Discharge pressure
8. Rota meter
9. Main switch
10. Thermostatic expansion valve
11. Energy meter
12. Temperature indicator
13. Miracle
14. RSS switch
15. Compressor and condenser fan
power button
16. Solenoid valve (SV)
Fig.1 Schematic diagram of experimental setup
The third component is the main switch whose job is to deliver power to the compressors.
The fourth device is the temperature indicator which tells the reading of the differential
temperature which is connected to the thermocouple. Filter component filter dryer that
separates harmful elements. The other component is Miracle which controls the current. In
other components, the most important part is the energy meter, which tells us how much
power consumed by the compressor; its reading is in the kWh. By putting refrigerant in the
system and working through the compressor, we get the cooling effect and our system works.
2.2.2 Experimental procedure
All types of equipment are fitted in the given picture, which we need. First take the initial
reading in which R134a and polyol ester oil (POE) lubricant was filled and the mass was 200
g of refrigerated and 800 ml of lubricant, now take capillary tube of 2.4 m and collect all the
readings in which pressure, temperature, flow rate, and power consumption, take all of these
readings, in the same way, noted all the data by applying the length of 2.7 m and 3.0 m. Now
for the second reading, completely removed the R134a refrigerant from the refrigerator, after
that, after checking all the leakages and vacuumize of system, and filled the LPG gas, which
was 80gm, and then took all the readings again which was taken earlier, for all lengths such
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as 2.4m, 2.7m and 3.0m length, note the pressure, temperature, flow rate, and power
consumption. Now left the purified gas again and opened the compressor and took out the
filled lubricant which was 800ml, then mixed the new lubricant with nano particles silicon
oxide and made nano lubricant which was 1000ml. First of all, put 200 ml inside the
compressor and then take it out so that the compressor is completely clean, then put the
whole 800 ml nano lubricant in the system. Now reinstalled the compressor and left it for
vacuums, after checking all the leakages for about 2 hours, filled the LPG gas in it, then
started the system and ran it for about 3 hours.
Fig. 2 Actual view of experimental test set up
Then made the system stable Turned off then next day started the system and started taking
readings, and take different readings for all three lengths, like 2.4m for 2.7m and 3.0m for
pressure, temperature, flow rate, And noted the reading of the power consumption. Now after
exhausting the entire LPG gas at the last, after filling the system, filled the refrigerant to
R134a, then after running the system for a while, started taking readings again. Note the data,
then put the length of 2.4m and note the data for 2.7m length of capillary tube after noting all
the readings, note the final reading by applying the tube of 3.0m in the last, the pressure,
temperature mass flow rate and finally power consumption by compressor in all these
readings are noted. Now after opening the compressor again pulses the complete lubricant
and after filling it with R134a refrigerant, handed over the lab to the system.
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2.2.3 Formula for calculation:
1. Power consumed by compressor:-
𝑃 =𝑛𝑜. 𝑜𝑓 𝑒𝑛𝑒𝑟𝑔𝑦 𝑚𝑒𝑡𝑒𝑟 𝑟𝑒𝑣𝑎𝑙𝑢𝑡𝑖𝑜𝑛 × 3600
𝑇𝑖𝑚𝑒 𝑡𝑎𝑘𝑒𝑛 𝑓𝑜𝑟 𝑛𝑜. 𝑜𝑓 𝑒𝑛𝑒𝑟𝑔𝑦 𝑚𝑒𝑡𝑒𝑟 𝑟𝑒𝑣𝑎𝑙𝑢𝑡𝑖𝑜𝑛 × 𝐶
C= energy meter constant
Value of energy meter constant in 750 rev/hour
2. Refrigeration capacity:-
𝑅𝐶 =𝑚 × 𝑐 × 𝛥𝑇
𝑇𝑖𝑚𝑒 𝑡𝑎𝑘𝑒𝑛 𝑓𝑜𝑟 𝑑𝑟𝑜𝑝 𝑖𝑛𝑖𝑡𝑖𝑎𝑙 𝑡𝑜 𝑓𝑖𝑛𝑎𝑙 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑚 =Mass of water in the chiller
𝑐 = Specific heat of water
Value of specific heat of water is 4.183 kj/kgK
3. Coefficient of performance (COP):-
𝐶𝑂𝑃 =𝑅𝑒𝑓𝑟𝑖𝑔𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝑐𝑎𝑝𝑎𝑐𝑖𝑡𝑦(𝐾𝑊)
𝑃𝑜𝑤𝑒𝑟 𝑖𝑛𝑝𝑢𝑡(𝐾𝑊)
4. Mass flow rate of refrigeration system:-
𝑚 = 𝑄 × 𝜌
𝑚 = Mass flow rate of refrigerant
𝑄 = Flow rate of refrigerant
𝜌 = Density of liquid refrigerant
3.0 RESULTS AND DISCUSSION
3.1 Effect of Combination of Refrigerant and Lubricant on Compressor Power
Consumption for Different Length of Capillary Tube
In this investigation use all three 2.4m, 2.7m and 3.0 m capillary tube length and give the
final result and shows Fig. 3 for all 4 conditions. First condition are R134a (200g) refrigerant
and polyol ester (POE) lubricant use then power consumption takes place .375KW for 2.4 m,
0.360KW for 2.7m and 0.390KW for 3.0 m capillary tube length, in a second condition use
R134a and nano lubricant (N.L.) ( POE +SiO2 0.2g/l) then results are 0.369KW for 2.4 m,
0.355KW for 2.7 m and 0.384KW 3.0 m for capillary tube length power consumed by
compressor, third condition is use LPG( 80g, 50% butane + 50% propane) and POE lubricant
then power consumption are 0.363KW for 2.4 m, 0.352KW for 2.7 m and 0.380KW for 3.0m
capillary tube length power consumed by compressor.
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Fig. 3: Effect of Combination of Refrigerant and Lubricant on Compressor Power
Consumption for Different Length of Capillary Tube
forth condition is use LPG (80g, 50% butane + 50% propane) and nano lubricant (N.L.)
(SiO2 0.2g/l + POE) and result is power consumption are 0.355KW for 2.4 m, 0.342KW for
2.7m and 0.369KW for 3.0 m capillary tube length. From this experiment found that Power
consumption is decreases when use of liquid petroleum gas (LPG) and nano lubricant (0.2g/l
SiO2 + POE) 5.8% for 2.4 m , 8.8% for 2.7 m and 1.6% for 3.0 m capillary tube length , as
compare to initial condition for R134a and + polyol ester ( POE).
3.2 Effect of Combination of Refrigerant and Lubricant on Refrigeration Capacity for
Different Length of Capillary Tube:
In this experiment use all three 2.4m, 2.7m and 3.0 m capillary tube length and give a result
and shows Fig. 4 for 4 conditions. First condition are R134a (200g) refrigerant and POE
lubricant use then the result of refrigeration capacity are 0.375KW for 2.4 m, 0.388KW for
2.7m and 0.358KW for 3.0 m capillary tube length, in a second condition use R134a and
nano lubricant (N. L.) (POE +SiO2 0.2g/l) then refrigeration capacities are 0.373KW for 2.4 m,
0.388KW for 2.7 m and 0.358KW 3.0 m for capillary tube length receives , third condition is
use LPG( 80g, 50% butane + 50% propane) and polyol ester oil (POE) lubricant then
Refrigeration capacities are 0.388KW for 2.4 m, 0.418KW for 2.7 m and 0.373KW for 3.0m
capillary tube length refrigeration effect are generate. forth condition is useliquid petroleum
gas( LPG) (80g, 50% butane + 50% propane) and nano lubricant (SiO2 0.2g/l + POE) and
result is refrigeration capacities are 0.392KW for 2.4 m, 0.420KW for 2.7m and 0.375KW for
0.3
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.39
0.4
POE+R134a N. L.+R134a POE+LPG N. L.+LPG
Com
pre
ssor
pow
er
Consu
mpti
on(K
W)
CAPILLARY TUBE LENGTH 2.4M
CAPILLARY TUBE LENGTH 2.7M
CAPILLARY TUBE LENGTH 3.0M
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Fig 4: Effect of Combination of Refrigerant and Lubricant on Refrigeration Capacity for
Different Length of Capillary Tube
3.0 m capillary tube length. From this investigation found that Refrigeration capacity was
increase when use of LPG and nano lubricant (0.2g/l SiO2 + POE) 5.09% for 2.4 m , 12.60%
for 2.7 m and 4.74% for 3.0 m capillary tube length , as compare to initial condition for
R134a and + POE.
3.3 Effect of Combination of Refrigerant and Lubricant on Coefficient of Performance
(COP) for Different Length of Capillary Tube:
In this experiment investigated for all three 2.4m, 2.7m and 3.0 m capillary tube length and
give a result and shows Fig. 5 for 4 conditions. First condition are R134a (200g) refrigerant
and POE lubricant use then the result of coefficient of performance (COP) are .994 for 2.4 m,
1.04 for 2.7m and 0.91 for 3.0 m capillary tube length, in a second condition use R134a and
nano lubricant ( POE +SiO2 0.2g/l) then COP are 1.01 for 2.4 m, 1.092 for 2.7 m and .93 for
3.0 m capillary tube length was received, third condition was used LPG( 80g, 50% butane +
50% propane) and POE lubricant then COP are 1.08 for 2.4 m, 1.187 for 2.7 m and 0.98 for
3.0m capillary tube length. forth condition is use LPG (80g, 50% butane + 50% propane) and
nano lubricant (SiO2 0.2g/l + POE) and result is COP are 1.104 for 2.4 m, 1.22 for 2.7m and
1.016 for 3.0 m capillary tube length. From this investigation found that COP was increase
when use of LPG and nano lubricant (0.2g/l SiO2 + POE) 11.06% for 2.4 m , 22.73% for 2.7
m and 2.21% for 3.0 m capillary tube length , as compare to initial condition for R134a and +
POE.
0.3
0.32
0.34
0.36
0.38
0.4
0.42
0.44
0.46
POE+R134a N. L.+R134a POE+LPG N. L.+LPG
Ref
riger
atio
n c
apac
ity (
KW
)
CAPILLARY TUBE LENGTH2.4
CAPILLARY TUBE LENGTH 2.7M
CAPILLARY TUBE LENGTH 3.0M
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Fig 5: Effect of Combination of Refrigerant and Lubricant on Coefficient of Performance for
Different Length of Capillary Tube
3.4 Effect of Combination of Refrigerant and Lubricant on evaporator temperature for
Different Length of Capillary Tube
In this experiment investigated for all three 2.4m, 2.7m and 3.0 m capillary tube length and
give a result and shows graph 3.4 for 4 conditions. First condition are R134a (200g)
refrigerant and POE lubricant use then the result of evaporator temperature are -50C for 2.4
m, -60C for 2.7m and -4
0C for 3.0 m capillary tube length, in a second condition use R134a
and nano lubricant ( POE +SiO2 0.2g/l) then
Fig 6: Effect of Combination of Refrigerant and Lubricant on Evaporator Temperature for
Different Length of Capillary Tube
0.7
0.8
0.9
1
1.1
1.2
1.3
POE+R134a N. L.+R134a POE+LPG N. L.+LPG
Coef
fice
nt
of
per
form
ance
CAPILLARY TUBE LENGTH2.4
CAPILLARY TUBE LENGTH 2.7M
CAPILLARY TUBE LENGTH 3.0M
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
POE+R134a N. L.+R134a POE+LPG N. L.+LPG
Evap
ora
tor
Tem
per
atur(
0C
)
CAPILLARY TUBE LENGTH2.4
CAPILLARY TUBE LENGTH 2.7M
CAPILLARY TUBE LENGTH 3.0M
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temperature of inlet of evaporator are -50C for 2.4 m, -6
0C for 2.7 m and -4
0C for 3.0 m
capillary tube length was received, third condition was used LPG( 80g, 50% butane + 50%
propane) and POE lubricant then evaporator temperature are -70C for 2.4 m, -9
0C for 2.7 m
and -60C for 3.0m capillary tube length. forth condition is use LPG (80g, 50% butane + 50%
propane) and nano lubricant (SiO2 0.2g/l + POE) and result is evaporator temperature are -
70C for 2.4 m, -9
0C for 2.7m and -6
0C for 3.0 m capillary tube length. From this investigation
found that inlet of evaporator temperature drop more when use of LPG and nano lubricant
(0.2g/l SiO2 + POE) 28.57% for 2.4 m , 44.44% for 2.7 m and 16.66% for 3.0 m capillary
tube length , as compare to initial condition for R134a and + POE.
3.5 Effect of Combination of Refrigerant and Lubricant on Pressure Ratio for Different
Length of Capillary Tube
This experiment for all three 2.4 m, 2.7m and 3.0 m capillary tube length and give a result
and shows graph 3.5 for all 4 conditions. First condition are R134a (200g) refrigerant and
POE lubricant use then the result of pressure ratio are 6.10 for 2.4 m, 5.94 for 2.7m and 6.11
for 3.0 m capillary tube length,
Fig. 7: Effect of Combination of Refrigerant and Lubricant on Pressure Ratio for Different
Length of Capillary Tube
in a second condition use R134a and nano lubricant ( POE +SiO2 0.2g/l) then pressure ratio
are 5.98 for 2.4 m, 5.89 for 2.7 m and 6.05 for 3.0 m capillary tube length was received, third
condition was used LPG( 80g, 50% butane + 50% propane) and POE lubricant then pressure
ratio are 5.54 for 2.4 m, 5.49 for 2.7 m and 5.63 for 3.0m capillary tube length. forth
condition is use LPG (80g, 50% butane + 50% propane) and nano lubricant (SiO2 0.2g/l +
4
4.5
5
5.5
6
6.5
7
POE+R134a N. L.+R134a POE+LPG N. L.+LPG
Pre
ssure
Rat
io
PRESSURE RATIO
CAPILLARY TUBE LENGTH2.4
CAPILLARY TUBE LENGTH 2.7M
CAPILLARY TUBE LENGTH 3.0M
Parishodh Journal
Volume IX, Issue III, March/2020
ISSN NO:2347-6648
Page No:8454
13
POE) and result are pressure ratio of the system are 5.48 for 2.4 m, 5.42 for 2.7m and 5.57 for
3.0 m capillary tube length. From this investigation found that pressure ratio of the system are
drop more pressure when use of LPG and nano lubricant (0.2g/l SiO2 + POE) 10.16% for 2.4
m, 11.14% for 2.7 m and 8.68% of discharge pressure drop for 3.0 m capillary tube length ,
as compare to initial condition for R134a and + POE.
4.0 CONCLUSION
After experimental investigation, effect of SiO2 (.2g/l) nano lubricant with the performance of
LPG (80g) refrigerant of vapour compression refrigeration system. following conclusion are
make:-
1. Power consumption is decreases when use of LPG and nano lubricant (0.2g/l SiO2 + POE)
5.8% for 2.4 m , 8.8% for 2.7 m and 1.6% for 3.0 m capillary tube length , as compare to
initial condition for R134a and + POE.
2. Refrigeration capacity was increase when use of LPG and nano lubricant (0.2g/l SiO2 +
POE) 5.09% for 2.4 m , 12.60% for 2.7 m and 4.74% for 3.0 m capillary tube length , as
compare to initial condition for R134a and + POE.
3. From this experimental investigation found that COP was increase when use of LPG and
nano lubricant (0.2g/l SiO2 + POE) 11.06% for 2.4 m , 22.73% for 2.7 m and 2.21% for
3.0 m capillary tube length , as compare to initial condition for R134a and + POE.
4. evaporator temperature drop more when use of LPG and nano lubricant (0.2g/l SiO2 +
POE) 28.57% for 2.4 m , 44.44% for 2.7 m and 16.66% for 3.0 m capillary tube length ,
as compare to initial condition for R134a and + POE.
5. From this investigation found that pressure ratio of the system are drop more pressure
when use of LPG and nano lubricant (0.2g/l SiO2 + POE) 10.16% for 2.4 m, 11.14% for
2.7 m and 8.68% of discharge pressure drop for 3.0 m capillary tube length , as compare
to initial condition for R134a and + POE.
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[1] D.S. Adelekan, O.S. Ohunakin, Jatinder Gill, I.P. Okokopujie, O.E. Atiba. Performance
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[2] D.S. Adelekan, O.S. Ohunakin, Jatinder Gill. Performance of a domestic refrigerator
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[3] T. O. Babarinde, S. A. Akinlabi & D. M. Madyira (2019) Experimental investigation of
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Parishodh Journal
Volume IX, Issue III, March/2020
ISSN NO:2347-6648
Page No:8456