Effect of Natural Convection on the Process of Melting and Solidification of Paraffin Wax

Farid, Mohammed; Mohamed, Aichouni

doi:10.1080/00986448708960492

Cited by 39 publications

(9 citation statements)

References 9 publications

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“…Thence, significant changes in the melting point, as well as the latent heat fusion during the thermal cycling of phase change materials are not favorable. Commercial PCMs are used for latent heat energy storage, because of their availability and low cost [ 4 , 5 , 6 , 7 ]. A solar thermal system with latent heat storage undergoes one melt/freeze cycle per day.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Thermal Cycling Test of Microencapsulated Paraffin Wax/Polyaniline Made by Simple Preparation Method for Solar Thermal Energy Storage

et al. 2013

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Microencapsulated paraffin wax/polyaniline was prepared using a simple in situ polymerization technique, and its performance characteristics were investigated. Weight losses of samples were determined by Thermal Gravimetry Analysis (TGA). The microencapsulated samples with 23% and 49% paraffin showed less decomposition after 330 °C than with higher percentage of paraffin. These samples were then subjected to a thermal cycling test. Thermal properties of microencapsulated paraffin wax were evaluated by Differential Scanning Calorimeter (DSC). Structure stability and compatibility of core and coating materials were also tested by Fourier transform infrared spectrophotometer (FTIR), and the surface morphology of the samples are shown by Field Emission Scanning Electron Microscopy (FESEM). It has been found that the microencapsulated paraffin waxes show little change in the latent heat of fusion and melting temperature after one thousand thermal recycles. Besides, the chemical characteristics and structural profile remained constant after one thousand thermal cycling tests. Therefore, microencapsulated paraffin wax/polyaniline is a stable material that can be used for thermal energy storage systems.

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Section: Introductionmentioning

confidence: 99%

Accelerated Thermal Cycling Test of Microencapsulated Paraffin Wax/Polyaniline Made by Simple Preparation Method for Solar Thermal Energy Storage

et al. 2013

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“…The PCM is treated as incompressible fluid since no pressure induced volume changes are expected in the computational domain with melt flow. The model ignores marginal effects such as the volume changes in PCM after phase transition [29], natural convection within melted PCM [41] and floating/sinking of solid dendrites within melted PCM caused by buoyancy [41].…”

Section: Numerical Simulationmentioning

confidence: 99%

Comparative Effectiveness of Different Phase Change Materials to Improve Cooling Performance of Heat Sinks for Electronic Devices

et al. 2016

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This paper thermo-physically characterizes salt hydrate, paraffin wax and milk fat as phase change materials (PCMs). The three PCMs are compared in terms of improving heat sink (HS) performance for cooling electronic packaging. An experimental study is carried out on commercially available finned HS with and without PCM under natural ventilation (NV) and forced ventilation (FV) at different heat loads (4 W to 10 W). The results indicate that integration of all of the PCMs into the HS improves its cooling performance; however, milk fat lags behind the other two PCMs in terms of cooling produced. A three-dimensional pressure-based conjugate heat transfer model has been developed and validated with experimental results. The model predicts the parametric influence of PCM melting range, thermal conductivity and density on HS thermal management performance. The HS cooling performance improves with increased density and conductivity while it deteriorates with the wider melting range of the PCMs.

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“…Comprehensive lists of the most possible candidates as organic PCMs have been reported in the literature by Lane et al [8], Lorsch et al [9], Abhat [10], Humphries and Griggs [11], Farid and Khudhair [12], Zalba et al [13], Farid et al [14] and Cabeza et al [15]. In all these studies, a number of criteria to be fulfilled by an ideal organic PCM candidate have been listed as: The limitations reported by many researchers are the low thermal conductivity possessed by many organic PCMs leading to low charging and discharging rates, supercooling effect in cooling cycles, and need for containers for preventing the leakage of PCMs [16--18].…”

Section: Classification and Properties Of Organic Pcmsmentioning

confidence: 99%

Testing of the functional garments with microencapsulated phase-change material in simulated high temperature conditions

Jovanović¹,

Stojisavljevic²,

Cvetanovic

et al. 2016

Hem Ind

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An organic phase change material (PCM) possesses the ability to absorb and release large quantity of latent heat during a phase change process over a certain temperature range. This paper presents results related to thermo-physiological efficiency of special underwear with organic PCM integrated in textile through microencapsulation process. The efficiency of PCM underwear was tested through physiological examinations in simulated high-temperature conditions, where test-subjects were voluntarily exposed to heat stress tests wearing NBC protective suit with PCM underwear (option "THERM") and without it (option "NoTHERM"). It can be concluded that wearing a PCM textile clothes under NBC protective suit, during physical activity in high-tempearture conditions, reduces sweating and alleviates heat stress manifested by increased core and skin temperature and heart rate values.

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Effect of Natural Convection on the Process of Melting and Solidification of Paraffin Wax

Cited by 39 publications

References 9 publications

Accelerated Thermal Cycling Test of Microencapsulated Paraffin Wax/Polyaniline Made by Simple Preparation Method for Solar Thermal Energy Storage

Accelerated Thermal Cycling Test of Microencapsulated Paraffin Wax/Polyaniline Made by Simple Preparation Method for Solar Thermal Energy Storage

Comparative Effectiveness of Different Phase Change Materials to Improve Cooling Performance of Heat Sinks for Electronic Devices

Testing of the functional garments with microencapsulated phase-change material in simulated high temperature conditions

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