Applications of nanorefrigerant and nanolubricants in refrigeration, air-conditioning and heat pump systems: A review

Alawi, Omer A.; Sidik, Nor Azwadi Che; Beriache, M’hamed

doi:10.1016/j.icheatmasstransfer.2015.08.014

Cited by 76 publications

(22 citation statements)

References 34 publications

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“…The refrigeration system with 0.2% V concentration of nanoparticles performs better than pure lubricant with R134a refrigerant and has 10.32% less energy consumption. Alawi et al [21] in their study enhanced the properties of the heat transfer fluid with the addition of nanoparticles. Authors have described that COP and freezing speed in cooling systems are enhanced by the addition of nanoparticles to refrigerants.…”

Section: Performance Of Nanoparticlesmentioning

confidence: 99%

Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil

Karthick¹,

Karuppiah

Kanthan³

2020

THERM SCI

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Compression of vaporized refrigerant is the essential process of the refrigeration cycle which is performed by using a compressor. The amount of power consumed by a refrigeration system is governed by the work input given to its compressor, which also determines the COP of the system. By reducing the work input given to the compressor, the power consumption of refrigerator is reduced along with the improvement in its COP. Nowadays, nanoparticles have emerged as the new generation additives in various working fluids because of their remarkable ability to improve the heat transfer, tribological and other thermophysical properties of the base fluid. In such a vein, we propose a compressor oil based nanofluid prepared by dispersing nanoparticles into the conventional compressor oil. In the present study, four samples of nanoadditive compressor oil were prepared by dispersing the nanoparticles like Al 2 O 3 , TiO 2 , and ZnO into the conventional mineral oil as a lubricant. The tribological properties of this four samples were studied, out of which one sample gave a better lubrication and heat transfer properties which are considered as one of the key parameters for reducing work input to the compressor, this can result in reduced power consumption, with enhancement of COP. These results are analyzed experimentally by carrying out performance and exergy analysis in a vapor compression refrigeration system, using R600a as a refrigerant. The experimental results show that, there is an improvement of COP by 14.61% and exergy efficiency by 7.51%. Also, the efficiency defect in the major components of vapor compression refrigeration system has been reduced effectively.

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Section: Performance Of Nanoparticlesmentioning

confidence: 99%

Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil

Karthick¹,

Karuppiah

Kanthan³

2020

THERM SCI

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“…The results show that the nanofluid had an energy savings of about 8.1–31.5% and 18–100% when the supplied air stream in the HVAC unit is reheated. Alawi et al 30 after a review of nanofluid in refrigeration systems concluded that nano-refrigerants have the potential to decrease the energy consumption of the system, while the use of nano-lubricants has the potential to improve the rate of heat transfer with the system. Finally, they stated that the use of nanoparticles can help improve the COP and rate of cooling of the refrigeration cycle.…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids

Okonkwo

Al‐Ansari

2021

Sci Rep

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This study presents a novel parametric investigation into the performance of a district cooling system using mono (Al2O3 and TiO2) and hybrid (Al2O3–TiO2) nanoparticles in the base fluids of water and ethylene–glycol water (EG-water) at a 20:80 ratio. The study analyses the effect of variables such as secondary fluid flow rate, evaporator and inlet temperatures, nanoparticle concentration, and air flowrate on the COP, total electrical energy consumption, and design of the district cooling unit. The analysis is performed with a thermal model developed and validated using operations data obtained from the McQuay chilled water HVAC unit operating in one of the facility plants at the Education City campus. The results of the study show that the use of nanofluids increased the overall heat transfer coefficient in the system by 6.6% when using Al2O3–TiO2/water nanofluids. The use of nanofluids in the evaporator also led to an average reduction of 23.3% in the total work input to the system and improved the COP of the system by 21.8%, 20.8% and 21.6% for Al2O3–TiO2/water, Al2O3/water, and TiO2/water nanofluids, respectively. Finally, an enhancement of 21.6% in COP was recorded for Al2O3–TiO2/EG-water nanofluids at a 5% nanoparticle volume concentration.

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“…Many investigators have reported the thermal enhancement and tribological improvement of mineral and synthetic refrigeration oil and bio lubricants with and without the addition of nanoparticles and concluded that the inclusion of nanoparticles to refrigeration oil leads to the reduction in power consumption, lower friction coefficients and enhancement in COP [14][15][16][17][18]. However, the inclusion of nanoparticles in lubricants, contribute to copious problems such as clogging, sedimentation and erosion and reasons for significant enhancement with nanoparticles at different concentrations are also unclear [19]. Refrigeration oil directly influences the tribological behaviour of interacting components of a compressor [20].…”

Section: Introductionmentioning

confidence: 99%

Vegetable Oil based Biodegradable Refrigeration Oil - An Optimization of Tribological Characteristics Using D-optimal Design

Vithya¹,

Sriram²,

Arumugam³

2021

Tribol. Ind.

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The present study investigates the tribological behaviour of vegetable oilbased polyolester refrigeration oil using the pin-on-disc tribometer. Experiments were carried out choosing the load and sliding velocity as a function of rotational speed as the numerical factor and refrigeration oil as the categorical factor. Response surface methodology (RSM) based Doptimal design was utilized for modelling and optimization of friction and wear characteristics. The tribological characteristics of a lubricantmaterial combination of hermetically sealed compressor was observed with synthetic refrigeration oil (POE68), vegetable oil based polyolester (BIO) and blended refrigeration oil i.e., (BIO50) 50% by vol. of vegetable oil based refrigeration oil & 50% by vol. of POE68. The results showed that the application of blended refrigeration oil (BIO50) leads to the improved tribological behaviour in terms of coefficient of friction of 0.02742 and specific wear rate of 1.98x10-4 mm 3 /Nm at a speed of 1160 rpm and load of 7.44 kg. The surface morphology analysis of worn pin surfaces showed that the compressor material lubricated with blended refrigeration oil was glossier than synthetic and vegetable oil based polyolester refrigeration oil.

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Applications of nanorefrigerant and nanolubricants in refrigeration, air-conditioning and heat pump systems: A review

Cited by 76 publications

References 34 publications

Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil

Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil

Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids

Vegetable Oil based Biodegradable Refrigeration Oil - An Optimization of Tribological Characteristics Using D-optimal Design

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