Experimental evaluation of SWCNT-water nanofluid as a secondary fluid in a refrigeration system

Vasconcelos, Adriano Akel; Gómez, Abdul Orlando Cárdenas; Filho, Ênio Pedone Bandarra; Parise, J. A. R.

doi:10.1016/j.applthermaleng.2016.06.126

Cited by 43 publications

(18 citation statements)

References 22 publications

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“…However, if the addition of nanoparticles enhanced the oil lubricant, the heat transfer coefficient would be compensated in the heat exchangers due to the improved overall thermophysical properties. Vasconcelos et al [ 453 ] examined MWCNT–water as a secondary fluid in a 4–9 kW refrigeration unit with R-22 as a refrigerant. Due to the high thermal conductivity of the nanofluid, the cooling capacity increased up to 22.2% at the coolant’s inlet temperature range of 30–40 °C.…”

Section: Thermal Applicationsmentioning

confidence: 99%

“…Due to the high thermal conductivity of the nanofluid, the cooling capacity increased up to 22.2% at the coolant’s inlet temperature range of 30–40 °C. Vasconcelos et al [ 453 ] found no significant reduction in the total power consumption. However, the increase in cooling load helped the compressor power consumption to relatively reduced because of the relative increase in evaporation pressure, and therefore the COP increased up to 33.3%.…”

Section: Thermal Applicationsmentioning

confidence: 99%

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Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

et al. 2021

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Nanofluids have opened the doors towards the enhancement of many of today’s existing thermal applications performance. This is because these advanced working fluids exhibit exceptional thermophysical properties, and thus making them excellent candidates for replacing conventional working fluids. On the other hand, nanomaterials of carbon-base were proven throughout the literature to have the highest thermal conductivity among all other types of nanoscaled materials. Therefore, when these materials are homogeneously dispersed in a base fluid, the resulting suspension will theoretically attain orders of magnitude higher effective thermal conductivity than its counterpart. Despite this fact, there are still some challenges that are associated with these types of fluids. The main obstacle is the dispersion stability of the nanomaterials, which can lead the attractive properties of the nanofluid to degrade with time, up to the point where they lose their effectiveness. For such reason, this work has been devoted towards providing a systematic review on nanofluids of carbon-base, precisely; carbon nanotubes, graphene, and nanodiamonds, and their employment in thermal systems commonly used in the energy sectors. Firstly, this work reviews the synthesis approaches of the carbon-based feedstock. Then, it explains the different nanofluids fabrication methods. The dispersion stability is also discussed in terms of measuring techniques, enhancement methods, and its effect on the suspension thermophysical properties. The study summarizes the development in the correlations used to predict the thermophysical properties of the dispersion. Furthermore, it assesses the influence of these advanced working fluids on parabolic trough solar collectors, nuclear reactor systems, and air conditioning and refrigeration systems. Lastly, the current gap in scientific knowledge is provided to set up future research directions.

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Section: Thermal Applicationsmentioning

confidence: 99%

Section: Thermal Applicationsmentioning

confidence: 99%

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

et al. 2021

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“…[23] According to these research results, CBNFs can improve the HTC or heat exchange capacity of HEs, mainly because CBNFs have higher thermal conductivity (k), strong Brownian motion, collision behavior between CBNMs and CBNMs with the wall of the HE, and a high energy delivery rate of CBNMs [12,13,15,21]. However, the use of CBNFs as the working fluid of the HE increases the ∆P of the HE mainly because of the higher viscosity (µ) of CBNFs [13,15,[22][23][24][25][26].…”

Section: Phementioning

confidence: 99%

“…Many researchers have applied CBNFs to air-cooled heat exchangers (ACHEs) or radiators [12][13][14][15], shell and tube heat exchangers [16][17][18], plate heat exchangers (PHE) [19][20][21][22][23], and double tube or tube heat exchangers [24][25][26] to improve heat exchange performance. In addition, different base fluids (BFs) such as water (W), ethylene glycol aqueous solution (EG-W) and lubricating oil are configured CBNFs for adapting to different use objects and temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Lue

Teng

et al. 2021

Applied Sciences

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The wet ball milling method was used and a dispersant (gum Arabic) was added to prepare various concentrations (0.05 and 0.2 wt%) of carbon-based nanofluids (CBNFs) by a two-step synthesis method as working fluids for heat exchange. CBNFs were actually used in a tube heat exchanger (THE) for heat transfer performance experiments. The heat transfer performance of water and CBNFs was estimated under different heating powers and flow rates of working fluid. The pump power consumption (Ppe) of 0.05 wt% CBNF was found to be similar to that of water, but the Ppe of 0.2 wt% CBNF was higher than that of water. The convective heat transfer coefficient (HTC) of CBNF in the was higher than that of water, and the HTC of 0.05 wt% and 0.2 wt% CBNF was optimal at the heating power of 120 W and 80 W, respectively. The average HTC of 0.05 wt% CBNFs at 120 W heating power was about 3.33% higher than that of water, while that of 0.2 wt% CBNFs at 80 W heating power was about 4.52% higher than that of water. Considering the Ppe and HTC concomitantly, the best overall system performance was exhibited by 0.05 wt% CBNFs.

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“…They also found that the system performance can be improved by using the optimum amount of nanoparticles and surfactants. Vasconcelos et al 90 studied experimentally by using SWCNT‐water nanofluid as a secondary fluid in a refrigeration system. The length and diameter of the SWCNT are 5 to 30 µm and 1 to 2 nm, respectively.…”

Section: Nanofluid In a Refrigeration Systemmentioning

confidence: 99%

A review on the application of the nanofluids

Dey

Sahu

2020

Heat Trans

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Nanofluid has become popular with the advancement in nanotechnology. Nanofluid has comparatively better stability than the microfluid because here much smaller‐sized particles (nanometer size) are suspended in the base fluid. It has improved thermophysical properties and convective heat transfer coefficient than the base fluid alone. That is why researchers have implemented this novel heat transfer fluid in versatile fields. These are solar collectors, solar thermal energy storage, electronics cooling, cooling and heating, heat pipes, automobile radiator, refrigeration system, natural convection, quenching, and many other applications. These varied applications indicate that in imminent future nanofluid will play a major role in these fields. Though all these trials are at present at academic research level, however, with the advancement in nanotechnology, surface science, colloidal chemistry, and so forth this nanofluid will definitely play a major role in heat transfer in the coming days.

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Experimental evaluation of SWCNT-water nanofluid as a secondary fluid in a refrigeration system

Cited by 43 publications

References 22 publications

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

A review on the application of the nanofluids

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