parishodh journal issn no:2347-6648 experimental …

1

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

Parishodh Journal

Volume IX, Issue III, March/2020

ISSN NO:2347-6648

Page No:8443

2

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

Parishodh Journal


ISSN NO:2347-6648

Page No:8444

3

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

Parishodh Journal


ISSN NO:2347-6648

Page No:8445

4

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

Parishodh Journal


ISSN NO:2347-6648

Page No:8446

5

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.

Parishodh Journal


ISSN NO:2347-6648

Page No:8447

6

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

Parishodh Journal


ISSN NO:2347-6648

Page No:8448

7

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.

Parishodh Journal


ISSN NO:2347-6648

Page No:8449

8

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.

Parishodh Journal


ISSN NO:2347-6648

Page No:8450

9

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



Parishodh Journal


ISSN NO:2347-6648

Page No:8451

10

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


Ref

riger

atio

n c

apac

ity (

KW

)

CAPILLARY TUBE LENGTH2.4



Parishodh Journal


ISSN NO:2347-6648

Page No:8452

11

Fig 5: Effect of Combination of Refrigerant and Lubricant on Coefficient of Performance for


3.4 Effect of Combination of Refrigerant and Lubricant on evaporator temperature for


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


0.7

0.8

0.9

1

1.1

1.2

1.3


Coef

fice

nt

of

per

form

ance




-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0


Evap

ora

tor

Tem

per

atur(

0C

)




Parishodh Journal


ISSN NO:2347-6648

Page No:8453

12

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


Pre

ssure

Rat

io

PRESSURE RATIO




Parishodh Journal


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.

REFERENCES

[1] D.S. Adelekan, O.S. Ohunakin, Jatinder Gill, I.P. Okokopujie, O.E. Atiba. Performance

of an iso- butane driven domestic refrigerator infused with various concentration of graphene

based nano lubricant. Procedia manufacturing 35(2019) 1146-1151.

[2] D.S. Adelekan, O.S. Ohunakin, Jatinder Gill. Performance of a domestic refrigerator

infused with safe charge of R600a refrigerant and various concentration of TiO2

nanolubricant. Procedia manufacturing 35(2019) 1158-1164

Parishodh Journal


ISSN NO:2347-6648

Page No:8455

14

[3] T. O. Babarinde, S. A. Akinlabi & D. M. Madyira (2019) Experimental investigation of

R600a/TiO2/mineral oil as a drop-in replacement for R134a/POE oil in a household

refrigeration system, International Journal of Ambient Energy, DOI:

10.1080/01430750.2019.1653983.

[4] S.O. Oyedepo, R.O. Fagbenle , T.O. Babarinde a comparative experimental study on

performance of domestic refrigerator using R600a and LPG with varying refrigerant charge

and capillary tube length. International journal of energy for a clean environment 18(4) 287-

302(2018).

[5] Luke O. Ajuka, Moradeyo k. Odunfa, Olayinka S. Ohunakin, Miracle O. Oyewola.

Energy and exergy analysis of vapour compression refrigeration system using selected eco-

friendly hydrocarbon refrigerants enhanced with TiO2 – nano particles. International journal

of engineering and technology 6(4) (2017) 91-97.

[6] Jatinder Gill, Jagdev singh, Olayinka S. Ohunakin, Damola S. Adelekan. Energetic and

exergetic analysis of a domestic refrigeratior system with LPG as a replacement for R134a

Refrigerant, using POE lubricant and miniral oil based TiO2, SiO2, and Al2O3 lubricant.

International journal of refrigeration S0140-7007(18)30168-3 (2018)

[7] Olayinka S. Ohunakin, Damola S. Adelekan, Taiwo O. Babarinde, Richard O. Leramo.

Experimental investigation of TiO2, SiO2 Al2O3 lubricants for a domestic refrigerator system

using LPG as working fluid. App;id thermal engineering 127(2017) 1469- 1477.

[8] S.O Oyedepo, R.O. Fagbenle, T. O Babarinde, K.M Odunfa, R.O. Leramo , P.O babalola.

Thermodynamics performance analysis and optimization of domestic refrigerator with

varying refrigeration charge and capillary tube lengths. Energy procedia 00(2015) 000-000.

[9] Amrat Kumar Dhamneya, S.P.S. Rajput, Alok Singh. Comparative performance analysis

of ice plant test rig with TiO2-R- 134a nano refrigerant and evaporative cooled condenser.

Case Studies in Thermal Engineering 11 (2018) 55–61.

[10] S.O. Oyedepo, R.O. fagbenle, T.O. Babarinde, K.M. Odunfa. Effect of capillary tube

length and refrigerant charge on the performance of domestic refrigerant with R12 and

R600a. International journal of advanced thermofluid research 2(2016) 2455-1368.

Parishodh Journal


ISSN NO:2347-6648

Page No:8456

parishodh journal issn no:2347-6648 experimental …

Documents