NH4Al(SO4)2·12H2O-Na2SO4 eutectic-based phase change materials with excellent light absorbance, enhanced thermal conductivity, and high latent heat performance
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Paraffin wax
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The shape-stabilized phase-change paraffin at lower temperature is an ideal material used in the phase-change wall. It can enhance the thermal storage capacity of the wall and save energy. The thermal properties of shape-stabilized phase-change paraffin were studied experimentally in this paper. The phase change temperature, latent heat and the stability of shape-stabilized phase-change paraffin with different component were analyzed. The critical mass fraction of paraffin required in the materials was discussed. The results may provide the basis for the application in the practical engineering in the future.
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To match the temperature range of central heating systems,several types of commercial grade paraffin with melting points have been investigated as the candidate phase change material(PCM).And the thermal behavior of the paraffin was tested.According to the phase change temperature difference and heat of fusion,the paraffin with the melting point at 87℃,latent heat of 203.9J/g,phase change temperature range of 80-90℃ was selected as the best phase change material.Paraffin emulsions were prepared by mixing non-ionic surfactants and co-surfactants.Thermal physical properties of these paraffin emulsions such as phase transition temperature and latent heat were tested.Because paraffin emulsions can store their latent heat during phase change process in the temperature range of 80-90℃,their heat storage density their and heat carrier density are higher than water.Based on that,paraffin emulsions are suitable for latent heat transportation.
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Building envelope
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One way to save electrical energy is by directly reducing the energy consumption and using materials that able to absorb heat. The best material in absorbing heat is paraffin. Paraffin is a group of organic Phase Change Material (PCM) which has high latent heat. Adding nanoparticles to the paraffin is expected to increase the latent heat of nano-PCM. The research aims to find out the thermal properties of nano PCM based paraffin and engineered to improve its latent heat. In this research, PCM material used is paraffin with Fe3O4, CuO, TiO2, and ZnO nanoparticles are added. Nano – PCM is synthesized using sonification methods with variations of 5, 10, and 15 wt%. Latent heat of thermal properties and a melting point of paraffin nano-PCM are measured using Differential Scanning Calorimetry (DSC). The results show the latent heat of paraffin nano-PCM has increased by 20.67%, 78.89%, 7.5%, and 20.17% for the addition of Fe3O4 (5 wt%), CuO (10 wt%), TiO2 (15 wt%), and ZnO (5 wt%) respectively. The better nano PCM in storing latent heat is paraffin-CuO at a mass fraction of 10 wt%. Meanwhile, the addition of nanoparticles has no significant effect on the melting point. These results showed that paraffin based nano-PCM is an excellent thermal energy storage.
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This chapter contains sections titled: Introduction Phase Change Materials: Definition, Principle of Operation, and Classifications PCM-Enhanced Cement-based Materials Hybrid PCM for Thermal Storage Numerical Simulations Thermal Modeling of Phase Change Nanoparticle-enhanced Phase Change Material Conclusions (General Remarks)
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Nanomaterials
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