Nanoadditives induced enhancement of the thermal properties of paraffin-based nanocomposites for thermal energy storage

Afolabi, Lukmon Owolabi; Al-Kayiem, Hussain H.; Baheta, Aklilu Tesfamichael

doi:10.1016/j.solener.2016.06.008

Cited by 51 publications

(10 citation statements)

References 26 publications

(23 reference statements)

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“…The SCW and LGW at 2.5% addition enhance the specific heat by 5% and 5%, respectively. The specific heat increased because of swift heat flow transition between the PCM and waste composite fillers, which prompted phase transition during charging and discharging of the microencapsulated PCM which is similar to the finding reported in the work of Owolabi et al 56 For both modified samples, linear decrease in thermophysical property was observed except for the specific values, however, the optimal load concentration for the SCW and LGW was at 7.5% particle addition.…”

Section: Thermal Analysis Testsupporting

confidence: 87%

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

et al. 2021

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Clinical wastes generated from hospitals and other health care institutions have increased globally, partly because of COVID-19 pandemic. Appropriate handling and disposal of this wastes is important because of their impact on human and environment. One approach is the use this wastes as composite fillers in phase change material (PCM) added into concrete and mortars used in built sector. This study investigates silicon catheter waste (SCW) and latex glove waste (LGW) as fillers mix with PCM cement mortar and evaluates the thermal performance. To determine a viable inclusion method for the cement mortar varying weight (2.5, 5.0, 7.5, and 10.0)% of PCM mixed with SCW and LGW were used as replacement of the composite aggregates. Characterization of the encapsulate PCM cement mortar and thermal analysis under elevated temperatures, compressive strength test, water absorption, porosity, and density was conducted. The microstructural analysis and thermal behavior of the modified specimens after 28 days was tested under dynamic ambient condition. From the result the quality of the cement mortar reduced from excellent to poor as the loading concentration increased from 0 to 10%. The addition of the PCM SCW and PCM LGW to the cement mortar reduced the compressive strength by 38% and 40%, respectively. The density value reduced by 3.2% and 6.8% under elevated temperature and the water absorption increased by 56% and 39%. The morphology of PCM cement mortar mixed with SCW and LGW showed less void spaces with increased homogenous formation.No thermal decomposition was observed in the PCM cement mortar with the addition of the SCW and LGW at elevated temperatures. The SCW and LGW fillers increased the thermal conductivity of the PCM mortar by 14% and 18%, and prolonged the surface temperature by 5 hours by an average of 5 C and 7 C, respectively. In addition, the SCW and LGW fillers mixed with PCM cement mortar was found to enhance the thermal performance by 65% compared with the typical cement mortar. There are huge potential on their application in building and construction industry.

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Section: Thermal Analysis Testsupporting

confidence: 87%

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

et al. 2021

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“…It was noticed that with inclusion of 1 vol% of nano-particles, the charging rates were augmented by 28.01%, 36.47% and 44.57%, and discharging rate by 14.63%, 34.95% and 41.46%, respectively. Owolabi et al [29] reported an increase in effective thermal conductivity of paraffin from 0.25 W/m.K to 0.29, 0.33, 0.35 and 0.54 W/m.K for Al, Cu, Zn and Fe based nano-PCM composites with 1.5 wt%. However, Lin and Al-Kayiem [30] reported that with an increase in concentration from 0.5-2 wt% for Cu based paraffin composites, the latent heat was reduced from 184.2 kJ/kg for base paraffin to 172.2-157.3 kJ/kg, respectively.…”

Section: Introductionmentioning

confidence: 98%

Heat transfer evaluation of metal oxides based nano-PCMs for latent heat storage system application

Khan

Sewell

2019

International Journal of Heat and Mass Transfer

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This article is focused on numerical analyses of commercially available metal-oxides as potential nano-additives for paraffin in thermal storage applications. Technical and economic prospects of metal-oxides based nano-PCMs are evaluated to help formulate selection criterion for nano-additives to achieve optimum thermal performance at acceptable cost. Numerical model based on enthalpy-porosity technique is developed which incorporates natural convection and transient variations in thermo-physical properties of nano-PCM. Numerical model is simulated for charging and discharging cycles of nano-PCMs in shell and tube heat exchanger at controlled temperatures. Transient simulations help in analysing heat transfer categorisation and isotherms distributions, solid-liquid interfaces propagations, charging and discharging rates, and overall thermal enthalpy. Inclusion of nano-particles increase the effective thermal conductivity and surface area for heat transfer, which results in enhanced charging and discharging rates. The conductive heat transfer, peak heat flux, charging and discharging rates are significantly enhanced by increasing volume concentration of nano-particles. The percentage enhancement in charging rates of SiO 2 based nano-PCM samples with 1% and 5% are 29.45% and 41.04%, respectively. Likewise, the discharging rates are improved by 21.09% and 30.08%, respectively. However, an increase in volume concentration reduces natural convection and overall thermal enthalpy, and increases total cost of nano-PCM. For instance, the percentage reductions in total enthalpy of CuO based nano-PCM samples with 1% and 5% volume concentrations are 8.01% and 32.14%, respectively. Likewise, the total costs are increased from 14.26 €/kg for base paraffin to 70.89-309.33 €/kg, respectively. Hence, the significance and originality of this research lies within evaluation and identification of preferable metal-oxides with higher potential for improving thermal performance at reasonable cost. This article will help bring significant impact to large-scale utilisation of low-carbon and clean energy technology in domestic and commercial applications.

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“…Preferably, the flat plate and parabolic trough solar collector are mostly used by the researchers. [3][4][5] The nanofluid is used as a heat transfer medium to transfer heat from solar collector to thermal storage system. Kalbande and Walke 6 studied the thermal storage system with a flat plate solar collector.…”

Section: Introductionmentioning

confidence: 99%

Performance of oil‐based thermal storage system with parabolic trough solar collector using Al ₂ O ₃ and soybean oil nanofluid

Kalbande

Walke

Rambhad

2021

Intl J of Energy Research

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Oil-based thermal energy storage system with solar collector has become populous due to its simple design and characteristics. Majorly, the solar-based thermal storage systems operate between 70 C and 150 C temperature, with one disadvantage of inability to store energy during off-peak hours. The stored energy in thermal storage can be used for the different domestic applications, such as water heating, cooking of food, boiling, etc. An effort has been made to investigate the oil-based thermal energy storage system with the potential design to achieve the higher temperature range of above 200 C. These systems can be used for domestic applications such as cooking. The integrated thermal storage system has been developed using nitrate salt as phase changing material to store the latent heat. The phase change material is filled in the cavity of the oil-based thermal storage. The aluminum oxide (Al 2 O 3 ) and soybean oil nanofluid in a thermo-syphon is used as a heat transfer fluid to store and transfer the sensible heat. Parabolic trough solar collector is coupled with thermal storage system. The maximum temperature of the phase change material, during the experiment, in thermal storage system was achieved up to 220 C, which is the melting point of phase change material. The mathematical model for the heat transfer analysis is also developed and the results were validated with the experimental results. The various heat transfer analysis using regression analysis is discussed.

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Nanoadditives induced enhancement of the thermal properties of paraffin-based nanocomposites for thermal energy storage

Cited by 51 publications

References 26 publications

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

Heat transfer evaluation of metal oxides based nano-PCMs for latent heat storage system application

Performance of oil‐based thermal storage system with parabolic trough solar collector using Al ₂ O ₃ and soybean oil nanofluid

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Nanoadditives induced enhancement of the thermal properties of paraffin-based nanocomposites for thermal energy storage

Cited by 51 publications

References 26 publications

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

Heat transfer evaluation of metal oxides based nano-PCMs for latent heat storage system application

Performance of oil‐based thermal storage system with parabolic trough solar collector using Al 2 O 3 and soybean oil nanofluid

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Performance of oil‐based thermal storage system with parabolic trough solar collector using Al ₂ O ₃ and soybean oil nanofluid