The influence of thermal properties of delafossite nanofluid CuAlO2 on the turbulent natural convection inside a cavity

Dawood, Mohamed M. Khairat; El-Tantawy, Farid; Sharaf, Osama; Nabil, Tamer; Elsaei, Ahmed

doi:10.1016/j.aej.2018.05.008

Cited by 6 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This supports the research by Kumar et al, [26] who found that using ZnO/LPG enhanced cooling capacity. Moreover, it also aligns with research conducted by Khairat Dawood et al, [27] who enhanced turbulent flow thermal conductivity within a hollow pipe by using a CuAlO2 nanofluid.…”

Section: Resultssupporting

confidence: 89%

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

Madyira,

Babarinde

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

To enhance a home refrigerator’s refrigeration system’s performance, three types of nanoparticles (TiO2, CNTs, and SiO2) were used to produce nanolubricants. The experiments were conducted with different charges of 50 and 60 g for R600a refrigerants, which a digital charging scale was used to measure. The inlet and exit temperature of the system’s components were measured using K-type thermocouples. The system was outfitted with two pressure gauges for measuring the pressures at suction and discharge. The obtained results show the system’s COP increases with nanolubricant-enhanced refrigerants, with the power of the based lubricant, TiO2, CNTs, and SiO2 nanolubricant being 0.0821, 0.0612, 0.0673, and 0.0702 kW, respectively. Therefore, nano-enhanced refrigerant can successfully replace R600a in the based lubricant in domestic refrigerators.

show abstract

Section: Resultssupporting

confidence: 89%

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

Madyira,

Babarinde

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Because the based lubricant consists of TiO 2 nanoparticles, the system's thermal conductivity increases [28,29], which improves the rate rejection rate to the surroundings. This correlates with the outcomes of Khairat et al [30] who used CualO 2 nanofluid to increase the thermal conductivity of the turbulent convention within a pipe with a cavity. The exergy destruction in the E • x dest.cap is presented in Fig.…”

Section: Resultssupporting

confidence: 83%

Exergy Analysis of Tita nium Dioxide (TiO2) Suspended with R290/R600 as a Substitute for R134a

Madyira,

Babarinde

2024

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Synthetic refrigerants are being phased out gradually in accordance with international environmental protection protocols because of global warming and ozone layer depletion. Adopting R290/R600 refrigerant, an environmentally friendly refrigerant, to replace R134a, a high global warming potential refrigerant, provides one of the solutions. In this study, exergy analysis of R134a and TiO2 suspended with lubricant and R290/R600 with a composition of 60% R290 and 40% R600 (60:40) was investigated in vapour compression system (VCRS) using R290/ R600 in TiO2 nanomixture lubricant and compared with R134a and R290/ R600 in pure lubricant. At the inlets and outlets, the main components of the VCRS are connected to temperature and pressure sensors to measure the inlet and outlet temperatures and pressures. The results obtained were used to analyses the exergy losses at various VCRS components (compressor, condenser, evaporator, expansion valve) were investigated to determine the refrigerator’s total exergy destruction (E·xdest.Total) and efficiency (ηex). The E·xdest.Total of R290/R600 in pure lubricant and R290/R600 TiO2 nanomixture lubricant was reduced by 26.9% and 42.3%, respectively, and system ηex increased by 27.7% and 38.9% respectively when compared to R134a in the system. Hence, TiO2 suspended with R290/R600 is potential a substitute for R134a.

show abstract

“…This is brought on by the system's increased thermal conductivity, which enhances heat transport [6], [18] This is consistent with the findings of Kumar et al [22], who discovered that using ZnO nanoparticles with LPG increased cooling capacity by increasing thermal conductivity. It similarly fits with the outcomes of Khairat et al [23], who used CuAlO2 nanofluid to improve the turbulent flow's thermal conductivity inside a hollow pipe. The discrepancy in system COP for different nanoparticles, as well as associated power usage and cooling capacity, are shown in Figure 7.…”

Section: Tmrees-2023supporting

confidence: 85%

Experimental evaluation of a vapour compression refrigeration system using a nano-oil mixture of TiO₂, Al₂O₃, and SiO₂

Madyira,

Babarinde

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Nanolubricants were used to improve the performance of refrigeration systems in a household refrigerator. In this study, a pure lubricant is used as the base compressor lubricant, and nanoparticles of TiO2, Al2O3, and SiO2 at 0.4g/L concentrations are used as nanolubricants in 50g isobutane (R600a) refrigerants. Power consumption was investigated alongside the COP. TiO2 nanolubricant has the highest COP of 2.8 and the lowest power consumption of 11.3% when compared to based lubricant. However, in terms of power consumption, SiO2 and Al2O3-nanolubricant outperformed the based lubricant by 4.5% and 7.7%, respectively. This suggests that a nanolubricant could be used in a refrigeration system to replace a based lubricant with R600a refrigerant.

show abstract

The influence of thermal properties of delafossite nanofluid CuAlO2 on the turbulent natural convection inside a cavity

Cited by 6 publications

References 35 publications

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

Exergy Analysis of Tita nium Dioxide (TiO2) Suspended with R290/R600 as a Substitute for R134a

Experimental evaluation of a vapour compression refrigeration system using a nano-oil mixture of TiO₂, Al₂O₃, and SiO₂

Contact Info

Product

Resources

About

The influence of thermal properties of delafossite nanofluid CuAlO2 on the turbulent natural convection inside a cavity

Cited by 6 publications

References 35 publications

TiO2, CNTs, and SiO2 nanolubricant: An approach to improving the efficiency of a domestic refrigerator

TiO2, CNTs, and SiO2 nanolubricant: An approach to improving the efficiency of a domestic refrigerator

Exergy Analysis of Tita nium Dioxide (TiO2) Suspended with R290/R600 as a Substitute for R134a

Experimental evaluation of a vapour compression refrigeration system using a nano-oil mixture of TiO2, Al2O3, and SiO2

Contact Info

Product

Resources

About

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

Experimental evaluation of a vapour compression refrigeration system using a nano-oil mixture of TiO₂, Al₂O₃, and SiO₂