B121 Thermal Management of Smart Phones Using Phase Change Materials (PCM)
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As smart phones become more complex, higher in performance and smaller in size, heat concentration at localized areas is becoming a problem. Phase change materials (PCM) have drawn attention as passive thermal management. In this study, simple experiments using PCM were conducted. The results showed that the saturation time increased with increase in the mass of PCM, and a relationship between the saturation time and the mass of PCM was a linear relation. Furthermore, the saturation time increased with decrease in the melting temperature of PCM. As a result, PCM is effective for the thermal management of smart phones.Keywords:
Phase-change material
Saturation (graph theory)
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Thermal energy
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Solid-solid phase change material can increase the thermal storage capacity of the wall, decrease the indoor temperature fluctuation and building energy consumption when it was used in the phase change material (PCM) wall. This paper investigated experimentally the phase change temperature and latent heat of polyalcohols binary system with different component, and analyzed the feasibility of phase change wall. The results show that binary systems have suitable phase change temperature and bigger phase change latent. They are ideal phase change materials used in the wall.
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Rapid economic development makes energy issues become increasingly severe,research on efficient and economical thermal storage technology becomes a common issue to the scholars.This article brief introduces phase change thermal storage technology in four areas:phase change thermal storage technology and classification,research on phase change materials,phase change heat transfer problem and its solution and the application of phase change thermal storage technology.This article also points out the further development of this thermal storage technology.
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Heat transfer fluid
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Abstract This paper presents a review of the storage of solar thermal energy with phase‐change materials to minimize the gap between thermal energy supply and demand. Various types of systems are used to store solar thermal energy using phase‐change materials. The performance of latent heat storage is dependent on the shape and size of the fins, the orientation and design of the storage unit, and its position. The efficiency of a solar thermal collector integrated with phase change material depends on the inclination of the collector, the position of the phase change material, and its thermo‐physical properties. The study of the thermo‐physical properties of various phase‐change materials and their effects is the focus of this paper.
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Thermal energy
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Using phase change material (PCM) as an energy storage medium is one of the most efficient ways of storing thermal energy. The latent heat storage provides much higher storage density than sensible heat storage, with a smaller temperature difference between storing and releasing heat. In addition, phase change materials provide constant and moderate temperature which is needed for drying most agriculture crops sufficiently. This paper reviews the previous work on solar drying systems which implemented the phase change material as an energy storage medium. It is concluded that the solar dryer with a PCM reduces the heat losses and improves the efficiency of the system
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Solar dryer
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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.
Phase-change material
Mass fraction
Thermal Stability
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Energy storage of phase change materials used in the building fields is more and more valuable and has become focus at home and abroad.The performance and types of phase change materials used in the thermal storage were studied.Development status of thermal storage theory and technology of phase change materials was introduced,and application of phase change materials in the building envelope,solar heating system,electric heat-storing system and cool-storing air conditioning system were analyzed.The result shows that the technology of thermal storage of phase change materials has good development prospect.
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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.
Phase-change material
Mass fraction
Thermal Stability
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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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