The Experts below are selected from a list of 49617 Experts worldwide ranked by ideXlab platform
Huaming Yang - One of the best experts on this subject based on the ideXlab platform.
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expanded vermiculite paraffin composite as a solar thermal Energy Storage Material
Journal of the American Ceramic Society, 2013Co-Authors: Chuanchang Li, Huaming YangAbstract:A solar thermal Energy Storage Material was prepared from expanded vermiculite (EVM) and paraffin by vacuum impregnation. Samples were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), petrographic analysis, and thermal conductivity measurements. The results indicated that EVM existed as a phlogopite structure in the EVM/paraffin composite. The composite latent heat was 137.6 J/g at the freezing temperature of 52.5°C and 135.5 J/g at the melting temperature of 48.0°C, when the paraffin content was 67%. The phlogopite structure of EVM benefited paraffin heat transfer because the composite exhibited a thermal conductivity of 0.545 W·(m·K)−1 higher than that of paraffin. Morphology and structural changes of EVM during composite preparation were investigated. The composite exhibited excellent thermal stability and has potential application in solar thermal Energy Storage and solar heating.
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Expanded Vermiculite/Paraffin Composite as a Solar Thermal Energy Storage Material
Journal of the American Ceramic Society, 2013Co-Authors: Chuanchang Li, Huaming YangAbstract:A solar thermal Energy Storage Material was prepared from expanded vermiculite (EVM) and paraffin by vacuum impregnation. Samples were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), petrographic analysis, and thermal conductivity measurements. The results indicated that EVM existed as a phlogopite structure in the EVM/paraffin composite. The composite latent heat was 137.6 J/g at the freezing temperature of 52.5°C and 135.5 J/g at the melting temperature of 48.0°C, when the paraffin content was 67%. The phlogopite structure of EVM benefited paraffin heat transfer because the composite exhibited a thermal conductivity of 0.545 W·(m·K)−1 higher than that of paraffin. Morphology and structural changes of EVM during composite preparation were investigated. The composite exhibited excellent thermal stability and has potential application in solar thermal Energy Storage and solar heating.
Chuanchang Li - One of the best experts on this subject based on the ideXlab platform.
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expanded vermiculite paraffin composite as a solar thermal Energy Storage Material
Journal of the American Ceramic Society, 2013Co-Authors: Chuanchang Li, Huaming YangAbstract:A solar thermal Energy Storage Material was prepared from expanded vermiculite (EVM) and paraffin by vacuum impregnation. Samples were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), petrographic analysis, and thermal conductivity measurements. The results indicated that EVM existed as a phlogopite structure in the EVM/paraffin composite. The composite latent heat was 137.6 J/g at the freezing temperature of 52.5°C and 135.5 J/g at the melting temperature of 48.0°C, when the paraffin content was 67%. The phlogopite structure of EVM benefited paraffin heat transfer because the composite exhibited a thermal conductivity of 0.545 W·(m·K)−1 higher than that of paraffin. Morphology and structural changes of EVM during composite preparation were investigated. The composite exhibited excellent thermal stability and has potential application in solar thermal Energy Storage and solar heating.
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Expanded Vermiculite/Paraffin Composite as a Solar Thermal Energy Storage Material
Journal of the American Ceramic Society, 2013Co-Authors: Chuanchang Li, Huaming YangAbstract:A solar thermal Energy Storage Material was prepared from expanded vermiculite (EVM) and paraffin by vacuum impregnation. Samples were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), petrographic analysis, and thermal conductivity measurements. The results indicated that EVM existed as a phlogopite structure in the EVM/paraffin composite. The composite latent heat was 137.6 J/g at the freezing temperature of 52.5°C and 135.5 J/g at the melting temperature of 48.0°C, when the paraffin content was 67%. The phlogopite structure of EVM benefited paraffin heat transfer because the composite exhibited a thermal conductivity of 0.545 W·(m·K)−1 higher than that of paraffin. Morphology and structural changes of EVM during composite preparation were investigated. The composite exhibited excellent thermal stability and has potential application in solar thermal Energy Storage and solar heating.
Kamil Kaygusuz - One of the best experts on this subject based on the ideXlab platform.
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thermal Energy Storage system using a technical grade paraffin wax as latent heat Energy Storage Material
Energy Sources, 2005Co-Authors: Kamil Kaygusuz, Ahmet SariAbstract:The objective of this study was to experimentally establish thermal Energy Storage (TES) performance using a technical grade paraffin wax as a phase change Material (PCM) in a vertical concentric pipe-in-pipe latent heat Storage system. The melting and solidification temperature range of the paraffin was found as 38°C–43°C and 36°C–42°C, respectively. These values were well in agreement with the values measured by differential scanning calorimetry (DSC) analysis. The inlet temperature and mass flow rate of the heat transfer fluid (HTF) were selected as experimental parameters. The radial and axial temperature distributions were determined during the heat charging and discharging processes of the PCM. The temporal temperature data showed that the relevant experimental parameters were more effective on the melting time than on the solidification time due to increased natural convection during the melting process. Furthermore, heat fraction during the charging and discharging processes of the PCM were establ...
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thermal performance of palmitic acid as a phase change Energy Storage Material
Energy Conversion and Management, 2002Co-Authors: Ahmet Sari, Kamil KaygusuzAbstract:Abstract Experimental investigation of palmitic acid as a phase change Material (PCM) for Energy Storage has been conducted in this study. The performance and heat transfer characteristics of a simple tube-in-tube heat exchanger system were studied, and the obtained results were compared with other studies given in the literature. The present study included some parameters, such as transition times, temperature range and propagation of the solid–liquid interface, as well as the heat flow rate characteristics of the employed cylindrical tube Storage system. The experimental results show that the melting front moves in the radial direction inward, as well as in the axial direction from the top toward the bottom of the PCM tube. It was observed that the convection heat transfer in the liquid phase plays an important role in the melting process. The flow rate and inlet temperature of the heat transfer fluid to the PCM tube in the experimented range has an insignificant effect on the phase change processes. On the other hand, the melting and solidification times of the PCM can be reduced significantly by placing the tube containing the PCM in a horizontal position rather than a vertical one. The heat Storage capacity of the PCM tube is not as good as we expected in this study, and the average heat Storage efficiency (or heat exchanger effectiveness) is 53.3. It means that 46.7% of the heat actually is lost somewhere.
Gui Yin Fang - One of the best experts on this subject based on the ideXlab platform.
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Preparation and characteristics of microencapsulated stearic acid as composite thermal Energy Storage Material in buildings
Energy and Buildings, 2013Co-Authors: Zhi Chen, Lei Cao, Feng Shan, Gui Yin FangAbstract:Microencapsulated stearic acid (SA) with silicon dioxide (SiO2) shell as composite thermal Energy Storage Material was prepared using sol-gel methods. In the composite thermal Energy Storage Material, the stearic acid was used as the core Material that is the latent heat Storage phase change Material (PCM), and the silicon dioxide acted as the shell Material which prevented the leakage of the melted stearic acid. Fourier transformation infrared spectroscope (FT-IR) and scanning electronic microscope (SEM) were used to determine chemical structure and microstructure of microencapsulated stearic acid with silicon dioxide shell. The thermal properties and thermal stability were investigated by the differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA). The SEM results showed that the stearic acid was encapsulated in the shell of the silicon dioxide shell. The DSC results indicated that the microencapsulated stearic acid with the silicon dioxide shell as composite thermal Energy Storage Material solidifies at 52.6 C with a latent heat of 162.0 kJ/kg and melts at 53.5 C with a latent heat of 171.0 kJ/kg when the encapsulation ratio of the SA is 90.7%. The TGA results presented that the silicon dioxide shells can improve the thermal stability of the microencapsulated stearic acid as composite thermal Energy Storage Material.
Ahmet Sari - One of the best experts on this subject based on the ideXlab platform.
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preparation and thermal properties of capric acid palmitic acid eutectic mixture as a phase change Energy Storage Material
Materials Letters, 2008Co-Authors: Ahmet Sari, Ali KaraipekliAbstract:Abstract This study focuses on the preparation, thermal properties and thermal reliability of capric acid (CA)/palmitic acid (PA) mixture as phase change Material (PCM) for low temperature latent heat thermal Energy Storage (LHTES). The differential scanning calorimetry (DSC) results indicated that the CA/PA mixture with eutectic composition (76.5/23.5 wt.%) was suitable PCM for low temperature LHTES applications in terms of melting and freezing temperatures (Tm = 21.85 °C; Tf = 22.15 °C) and latent heats of melting and freezing (ΔHm = 171.22 J/g; ΔHf = 173.16 J/g). The thermal properties make it potential PCM for LHTES systems used in heating, ventilation, and air conditioning applications. Accelerated thermal cycling tests showed that the eutectic mixture as a PCM has good long-term thermal reliability. The probable reasons of the changes occurred in thermal properties of the PCM during accelerated thermal cycling were also investigated using Fourier Transform Infrared (FT-IR) spectroscopy method.
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thermal Energy Storage system using a technical grade paraffin wax as latent heat Energy Storage Material
Energy Sources, 2005Co-Authors: Kamil Kaygusuz, Ahmet SariAbstract:The objective of this study was to experimentally establish thermal Energy Storage (TES) performance using a technical grade paraffin wax as a phase change Material (PCM) in a vertical concentric pipe-in-pipe latent heat Storage system. The melting and solidification temperature range of the paraffin was found as 38°C–43°C and 36°C–42°C, respectively. These values were well in agreement with the values measured by differential scanning calorimetry (DSC) analysis. The inlet temperature and mass flow rate of the heat transfer fluid (HTF) were selected as experimental parameters. The radial and axial temperature distributions were determined during the heat charging and discharging processes of the PCM. The temporal temperature data showed that the relevant experimental parameters were more effective on the melting time than on the solidification time due to increased natural convection during the melting process. Furthermore, heat fraction during the charging and discharging processes of the PCM were establ...
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thermal performance of palmitic acid as a phase change Energy Storage Material
Energy Conversion and Management, 2002Co-Authors: Ahmet Sari, Kamil KaygusuzAbstract:Abstract Experimental investigation of palmitic acid as a phase change Material (PCM) for Energy Storage has been conducted in this study. The performance and heat transfer characteristics of a simple tube-in-tube heat exchanger system were studied, and the obtained results were compared with other studies given in the literature. The present study included some parameters, such as transition times, temperature range and propagation of the solid–liquid interface, as well as the heat flow rate characteristics of the employed cylindrical tube Storage system. The experimental results show that the melting front moves in the radial direction inward, as well as in the axial direction from the top toward the bottom of the PCM tube. It was observed that the convection heat transfer in the liquid phase plays an important role in the melting process. The flow rate and inlet temperature of the heat transfer fluid to the PCM tube in the experimented range has an insignificant effect on the phase change processes. On the other hand, the melting and solidification times of the PCM can be reduced significantly by placing the tube containing the PCM in a horizontal position rather than a vertical one. The heat Storage capacity of the PCM tube is not as good as we expected in this study, and the average heat Storage efficiency (or heat exchanger effectiveness) is 53.3. It means that 46.7% of the heat actually is lost somewhere.