Influence of particle concentration and temperature on the thermophysical properties of CuO/R134a nanorefrigerant

Alawi, Omer A.; Sidik, Nor Azwadi Che

doi:10.1016/j.icheatmasstransfer.2014.08.038

Cited by 60 publications

(40 citation statements)

References 33 publications

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“…The CNT based refrigerant is found to have higher thermal conductivity owing to the superior thermal conductivity of CNT particles. Variation in thermal conductivity of CuO/R134a as a function of particle volume fraction (at 300 K) [20]. Figure 2 shows that the ratio of effective thermal conductivity of the nanofluid to the thermal conductivity of the base fluid of Al 2 O 3 /R-134a nanorefrigerant reduces with an increase in the particle size of Al 2 O 3 .…”

Section: Thermal Conductivitymentioning

confidence: 98%

“…Peng et al [19] have experimentally investigated the thermal conductivity of a nanorefrigerant, and proposed a model to predict the thermal conductivity. The authors used spherical nanoparticles of copper, aluminum, nickel, copper oxide, and aluminum oxide with mean diameters of 25,18,20,40, and 20 nm, respectively, in R-113 refrigerant. The authors concluded that with increase in nanoparticle concentration, the thermal conductivity increases sharply.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…Additionally, they reported that for the same volume concentration, the thermal conductivity values for different types of nanoparticles showed little variation. Alawi et al [20] used the thermal conductivity model developed by Koo and Kleinstreuer [21] which takes the effects of particle size, particle volume fraction, Brownian motion and temperature dependence into consideration and found that the increase in thermal conductivity of a nanorefrigerant was 141% for 5 vol% concentration of spherical CuO/R134a. The authors found a 43% increase in thermal conductivity at a temperature of 325 K for 5 vol% nanoparticle concentration.…”

Section: Thermal Conductivitymentioning

confidence: 99%

See 2 more Smart Citations

Review of the Thermo-Physical Properties and Performance Characteristics of a Refrigeration System Using Refrigerant-Based Nanofluids

Patil

Kim

Seo³

et al. 2015

Energies

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Nanofluids are considered a promising choice for several heat transfer applications. With the increasing awareness for energy saving and efficiency improvement in various thermal systems, including refrigeration systems, there is a growing interest in the refrigerant-based nanofluids owing to their superior thermo-physical properties. Nanorefrigerants are a class of nanofluid, which consist of suspended nanoparticles in a base refrigerant. In this paper, it is intended to include many articles on refrigeration systems that use nanorefrigerants, published in the period from 2005 to 2015. Although this is an extensive review, it could not include all the papers, and only some major research works were selected. It is believed that the dependency of thermal conductivity and other properties on temperature will make the thermal systems more efficient while operating at a high temperature. The literature reviews associated with the performance characteristics of nanorefrigerants in refrigeration systems for the last 10 years have been compiled and presented in this paper. Furthermore, recent studies related to thermo-physical properties of nanorefrigerants and nanolubricants have also been summarized and reviewed in this paper.

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Section: Thermal Conductivitymentioning

confidence: 98%

Section: Thermal Conductivitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

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Review of the Thermo-Physical Properties and Performance Characteristics of a Refrigeration System Using Refrigerant-Based Nanofluids

Patil

Kim

Seo³

et al. 2015

Energies

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“…Some papers can be mentioned among the studies devoted to the investigation of the nanorefrigerants thermophysical properties [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Performed in the past two decades studies have shown that the addition of small amounts of nanoparticles can significantly change the thermophysical properties of the base fluid [1][2][3][4][5][6][7][8][9][10]. The application of nanofluids as coolants and working fluids in thermal power systems (including refrigeration) can contribute to the intensification of heat transfer processes in various heat exchangers [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of nanoparticles of ТiO2 on the thermophysical properties of the refrigerant R141b

Khliyeva¹,

Lukianova²,

Semenyuk³

et al. 2018

EEJET

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Наведено результати експериментального дослiдження теплофiзичних властивостей холодоагенту R141b, розчину R141b/поверхнево-активна речовина (ПАР) Span-80 i нанофлюїду R141b/Span-80/наночастинки TiO 2 . Вмiст як ПАР, так i наночастинок TiO 2 у об'єктах дослiдження складав 0,1 мас. %. Вимiри проведено на лiнiї кипiння в iнтервалах температур (273...293) K для густини, (293...343) K для поверхневого натягу, (300...335) K для динамiчної в'язкостi, (293...348) K для теплопровiдностi, (261...334) K для iзобарної теплоємностi. Показано, що вплив ПАР та наночастинок TiO 2 на густину холодоагенту R141b був незначним i сумiрним iз невизначенiстю експериментальних даних (до 0,08 %). Добавки сумiсно ПАР та наночастинок TiO 2 сприяли зниженню поверхневого натягу R141b на величину до 0,3 % у порiвняннi з чистим R141b. Добавки сумiсно ПАР та наночастинок TiO 2 в R141b сприяли збiльшенню в'язкостi на (0,8...1,0 холодоагенту (0,3...1) %. Було зафiксовано зниження на (1,5...2,0 (до 1,0 %). ) %, а добавки ПАР призводилили до суттєвого зниження в'язкостi -на (3,5...5,0) % у порiвняннi з в'язкiстю чистого R141b. Показано, що добавки ПАР в R141b суттєво не впливають на теплопровiднiсть (ефект не перевищував 0,25 %), а добавки сумiсно ПАР та наночастинок TiO 2 призводять до збiльшення теплопровiдностi ) % питомої iзобарної теплоємностi при введеннi у R141b сумiсно ПАР та наночастинок TiO 2 та незначне збiльшення теплоємностi при додаваннi ПАР Зроблено висновок, що вплив добавок наночастинок та ПАР на теплофiзичнi властивостi холодоагенту R141b є неоднозначним та непрогнозованим. Результати експериментальних дослiджень впливу наночастинок на теплофiзичнi властивостi холодоагенту пiдтверджують необхiднiсть розробки методiв моделювання цих властивостей на основi урахування наявностi на поверхнi наночастинок структурованої фази базової рiдини або ПАР.Ключовi слова: холодоагент R141b, нанофлюїд R141b/ наночастинкиTiO 2 , густина, поверхневий натяг, питома iзобарна теплоємнiсть, теплопровiднiсть, в'язкiсть UDC 621.564.2:[536.22+536.632+538.953+538.93] 34 ing the nanofluids thermophysical properties and for the modeling of heat transfer processes.

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Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

2023

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Nanofluids are utilized in cooling equipment such as heat exchangers and renewable energies such as solar cells as heat transfer fluid. The techniques for nanofluid stability enhancement and stability evaluations, such as zeta potential, electron microscopy, and photographic techniques for sedimentation, are reviewed as well as some recent achievements in nanofluid stabilization and research on the parameters affecting the thermal properties of nanofluids. Finally, the applications of nanofluids in cooling devices are described. Increased heat transfer, reduced heat transfer time and size of heat exchangers, and finally higher energy and heat efficiency could be the most significant achievements. The parameters affecting the thermal conductivity of nanofluids include concentration, temperature, particle fluid, type of base fluid, and nanoparticles.

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Influence of particle concentration and temperature on the thermophysical properties of CuO/R134a nanorefrigerant

Cited by 60 publications

References 33 publications

Review of the Thermo-Physical Properties and Performance Characteristics of a Refrigeration System Using Refrigerant-Based Nanofluids

Review of the Thermo-Physical Properties and Performance Characteristics of a Refrigeration System Using Refrigerant-Based Nanofluids

Experimental study of the effect of nanoparticles of ТiO2 on the thermophysical properties of the refrigerant R141b

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

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