The impacts of utilizing
            <scp>nano‐encapsulated PCM</scp>
            along with
            <scp>RGO</scp>
            nanosheets in a pulsating heat pipe, a comparative study

Mohammadi, Omid; Shafii, Mohammad Behshad; Shirin‐Abadi, Abbas Rezaee; Heydarian, Reza; Ahmadi, Mohammad Hossein

doi:10.1002/er.7056

Cited by 21 publications

(9 citation statements)

References 44 publications

(46 reference statements)

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“…Consumption of individuals and families has increased dramatically following the spread of COVID-19 worldwide. The spread of COVID-19 heart disease has led to an increase in global demand for disinfectants, detergents, masks, and other health items [2,3]. The increase of these detergents and masks increases the pollution of water and wetlands and the environment and has adverse negative effects on living organisms [4].…”

Section: Introductionmentioning

confidence: 99%

An Environmentally Friendly Solution for Waste Facial Masks Recycled in Construction Materials

et al. 2022

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In response to the COVID-19 pandemic, single-use disposable masks saw a dramatic rise in production. Facial masks that are not properly disposed of will expose the environment to a form of non-biodegradable plastic waste that will take hundreds of years to degrade. Therefore, recycling such waste in an eco-friendly manner is imperative. Fibered or shredded waste masks can be used to make green concrete that is an environmentally friendly solution to dispose the facial masks. This study prepared six classes of concrete samples, three of which contained fibers from masks and three of which contained shredded masks at the ages of seven days and 28 days. The results show that in the seven-day and 28-day samples, mask fiber added to the mixes resulted in increased compressive strength. For seven-day and 28-day samples, the compressive strength increased by 7.2% and 10%, respectively. Despite that, the results of the shredded mask addition to concrete indicate that the increase in shredded mask volume has a minor impact on the compressive strength of the seven-day samples. An increase in shredded mask from 0.75 to 1% increased 28-day compressive strength by 14%. However, the compressive strength of the mask fiber decreased by 8 after 1% volume. According to a thermal analysis of 28-day concrete samples, as the fiber percentage increases, the mass loss percentage increases. The mass loss rate for samples containing fibers is higher than that for samples containing shredded mask pieces. In general, based on the results mentioned above, the use of fiber in concrete in its fiber state enhances its strength properties. As a result, using shredded mask pieces in concrete leads to better curing due to the reduction of residual capillary pore water loss in construction materials.

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Section: Introductionmentioning

confidence: 99%

An Environmentally Friendly Solution for Waste Facial Masks Recycled in Construction Materials

et al. 2022

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“…The thermal conductivity increases by increasing the mass fraction of nanoparticles. Because of the higher thermal conductivity of nanoparticles than PCM, increasing the mass fraction of nanoparticles in PCM, enhances its thermal conductivity 10 . It is notable that the maximum and minimum of thermal conductivity of NePCMs in the absence of the nanoparticle size factor, are 0.241 W/m.K (at 6 wt% of Cu nanoparticle) and 0.176 W/m.K (at 1 wt% of Al 2 O 3 nanoparticle).…”

Section: Resultsmentioning

confidence: 99%

“…Because of the higher thermal conductivity of nanoparticles than PCM, increasing the mass fraction of nanoparticles in PCM, enhances its thermal conductivity. 10 It is notable that the maximum and minimum of thermal conductivity of NePCMs in the absence of the nanoparticle size factor, are 0.241 W/m.K (at 6 wt% of Cu nanoparticle) and 0.176 W/m.K (at 1 wt% of Al 2 O 3 nanoparticle). Therefore, to obtain higher thermal conductivity, the use of Cu nanoparticles with a higher mass fraction is more effective.…”

Section: Thermal Conductivitymentioning

confidence: 96%

“…A variety of nanoparticles has been loaded into PCMs to manufacture nano‐enhanced phase change materials (NePCMs), including carbon‐based nanostructures, metals, and metal oxide‐based nanoparticles, among others 9,10 . In this work, paraffin wax was used as a PCM, and Al 2 O 3 and Cu nanoparticles were utilized to improve its thermophysical properties.…”

Section: Introductionmentioning

confidence: 99%

“…7,8 A variety of nanoparticles has been loaded into PCMs to manufacture nano-enhanced phase change materials (NePCMs), including carbon-based nanostructures, metals, and metal oxide-based nanoparticles, among others. 9,10 In this work, paraffin wax was used as a PCM, and Al 2 O 3 and Cu nanoparticles were utilized to improve its thermophysical properties. Since Cu has a higher thermal conductivity than other metals 11,12 and Al 2 O 3 has been widely used as an additive in nanofluids and PCMs due to its high thermal conductivity and also it is more cost-effective than aluminum, 13,14 nanoparticles of these two materials have been selected for improving the thermal properties of the paraffin wax.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

Jafarian

Gracia

Omid

et al. 2021

Intl J of Energy Research

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Summary The usage of phase change materials (PCMs) in thermal energy storage (TES) systems has been a promising approach in recent years. An accurate estimation of their thermophysical properties is a key factor in their optimal and efficient performance in TES systems. In this study, aluminum oxide (Al2O3) and copper (Cu) nanoparticles were incorporated in paraffin wax as a PCM to enhance its thermophysical properties. The effects of the nanoparticle type, mass fraction, and its size on the specific heat, density, thermal conductivity, and TES density of the nanocomposites, were investigated. A field emission scanning electron microscope (FESEM) was used to study their morphology. The experiments were based on three factors, nanoparticle type (Al2O3 and Cu), nanoparticle mass fraction (1%, 3%, and 6%), and nanoparticle size (30, 70, and 110 nm), while pure paraffin wax was applied as the control sample. The addition of nanoparticles to paraffin has been proven to be a promising technique. The results showed that the specific heat changes of the NePCMs have not been influenced by the factors under consideration. Also, higher mass fractions and smaller sizes of nanoparticles resulted in higher densities in NePCMs. Moreover, the thermal energy storage density of NePCMs increased at higher loading and smaller size of the nanoparticles. The improvement in thermal conductivity is especially significant if the smallest nanoparticle size with mass fractions of 3% and 6% is used. An improvement in thermal conductivity of up to 72% has been achieved at a mass fraction of 6% of 30 nm copper nanoparticles. Finally, the NePCM containing 6% mass fraction and 30 nm size of the nanoparticle (A6S and C6S) were selected as optimal NePCMs.

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CFD modeling of a triple‐walled direct absorption evacuated tube solar collector based on hybrid nanofluid/microencapsulated PCM

Shahini,

Karami,

Akhavan‐Behabadi

2024

Energy Science & Engineering

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Nowadays, direct absorption solar collectors are a new concept of solar collectors which have attracted special attention. The type of heat transfer fluid (HTF) has a significant influence on the efficiency of this kind of collector. Therefore, in this study, a wide range of working fluids including mono nanofluid ( and CuO), binary nanofluid, and especially the incorporation of a new hybrid combination of nanofluid and microencapsulated phase change material (MPCM), are used as the working fluids of a triple‐walled direct absorption evacuated tube solar collector. The computational fluid dynamics (CFD) method is used for simulating the collector and investigating the effect of different parameters including volume fraction, base fluid, mass flow rate, and type of absorber tube structure (double‐ and triple‐walled) on collector thermal performance. Results show that binary nanofluids of 0.06% /0.002% CuO/water and 0.06% /0.002% CuO/ethylene glycol (EG) have the largest working fluid temperature differentials equal to 48.31 and 66.5 K, respectively. It was inferred that, at the mass flow rate of 2.7 , the efficiency is obtained to be 60.29% employing binary/EG nanofluid, which is 8.68% and 15.31% higher than CuO/EG and /EG nanofluids, respectively. Inserting the hybrid CuO nanofluid/MPCM leads to an improvement of 1.14% and 1.22% in the efficiency of triple‐ and double‐walled collectors, respectively, with respect to the individual usage of the nanofluid. The thermal efficiency of the double‐walled structure is higher than triple‐walled considering all HTFs.

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The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

Cited by 21 publications

References 44 publications

An Environmentally Friendly Solution for Waste Facial Masks Recycled in Construction Materials

An Environmentally Friendly Solution for Waste Facial Masks Recycled in Construction Materials

Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

CFD modeling of a triple‐walled direct absorption evacuated tube solar collector based on hybrid nanofluid/microencapsulated PCM

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