Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Phase Change Materials (PCMs)"”.
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Investigation of advanced experimental and computational techniques for behavioural characterisation of phase change materials (pcms)
The existing Phase Change Material (PCM) thermal investigation methods have significant drawbacks and limitations in terms of the correct determination of phase change temperature and enthalpy values. It results in the inaccuracy and sometimes absence of experimental data which are required for the …
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A Variation of Positioning Phase Change Materials (PCMs) Within Building Enclosures and Their Utilization Toward Thermal Performance
… an increasing concern for building occupants. Phase Change Materials (PCMs), which are capable of storing and releasing significant amounts of energy by melting and solidifying at a given temperature, are perceived as a promising opportunity for improving the thermal performance of buildings. …
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Thermal Characterization of Graphitic Carbon Foams for Use in Thermal Storage Applications
… store energy using the latent heat capacity of phase change materials (PCMs). Due to the low thermal conductivity of most PCMs, TCEs are necessary to evenly distribute heat throughout the PCM. Graphitic foams have been used as TCEs due to their high thermal conductivity, high specific surface …
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Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
… circuits (PICs) and the integration of phase change materials (PCMs) enables promising designs which are compact, non-volatile, and efficient. However, conventional PCMs such as Ge₂Sb₂Te₅ (GST) introduce significant optical absorption loss, leading to elevated insertion losses in …
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Shape-Stabilization of PCM/HDPE Composites with 3D-Printing Applications for Battery Thermal Management
<p>Phase-change materials (PCMs) are a useful alternative to more traditional methods of thermal management of Li-ion batteries in electric or hybrid-electric vehicles. PCMs are materials which absorb large amounts of latent heat and undergo solid-to-liquid phase change at near-constant …
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ENHANCEMENT OF PHASE CHANGE MATERIAL (PCM) THERMAL ENERGY STORAGE IN TRIPLEX-TUBE SYSTEMS
… thermal energy storage components utilizing phase change materials (PCMs). These materials have the potential to store large amounts of energy in relatively small volumes and within nearly an isothermal storage process. The primary drawback of today’s PCMs is that their low thermal …
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Evaluation of Various Energy Storage Options for the Internal Thermal Loads of a Non-Airbreathing Hypersonic Vehicle
… capability, an exhaustive search of available phase change materials (PCMs) is conducted. PCMs have been used in hypersonic vehicles in the past as a means of energy storage. Additionally, the use of energy-consuming endothermic reactions is considered. An innovative PCM-endothermic reaction …
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Experimental and theoretical investigation of novel phase change materials for thermal applications
… of R134a clathrates with additives, as phase change materials (PCMs). PCMs’ charging characteristics are analysed and evaluated for cooling applications. The formation of refrigerant clathrates is investigated due to their potential use in active as well as in passive cooling …
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Thermal performance of a room with wall latent heat storage
… the feasibility and benefits of utilization of phase change materials (PCMs) in building envelope components for thermal storage were investigated. The phase change material (PCM) gypsum board used in this study was made by soaking conventional gypsum board in a PCM with phase change range of …
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New technologies for energy savings in the refurbishment of existing buildings.
… the thermal comfort. The most used heat storage materials for building application are the Phase Change Materials (PCMs) which store solar energy during the day and release it during the night. The aim of this work is to test the usefulness of PCMs for improving summer thermal comfort in …
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Modeling and implementation of solder-activated joints for single actuator, centimeter-scale robotic mechanisms
This thesis explains when, and why, solder-based phase change materials (PCMs) are best-suited as a means to modify a robotic mechanism's kinematic and elastomechanic behavior. The preceding refers to mechanisms that possess joints which may be thermally locked and unlocked via a material phase …
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Heat Transfer Enhancement of Phase Change Materials for Thermal Energy Storage Systems
… recent studies, the energy storage capability of phase change materials (PCMs) in thermal energy storage systems, such as in the case of solar water heaters has attracted many attentions; however, PCMs may not be fully effective due to their poor heat transfer characteristics, namely thermal …
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Latent and sensible heat storage in concrete blocks
… a practical approach to store energy in building materials by incorporating Phase Change Materials (PCMs) into their structures. The intend of this present work is to address this achievement. Concrete blocks (both regular and autoclaved), the widely used construction material, were selected as …
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Molecular Origins of Phase Stability in Phase-Change Nano-Emulsions for Thermal Energy Storage by NMR Spectroscopy
<p>Phase change materials (PCMs) are latent heat storage materials that can store or release thermal energy during phase transitions. Organic PCM nano-emulsions are formed by emulsifying oil in water in the presence of surfactants, enhancing thermal conductivity and pumpability. However, PCMs …
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Predicting the thermal performance of bio-based cold chain packaging system
… (ISCs) requires an in-depth understanding of how materials, design, and environmental factors influence heat transfer. This research combines experimental and computational approaches to improve the thermal efficiency and environmental sustainability of passive cold chain packaging systems. The …
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Development, Characterization, & Implementation of Phase-Change Material Cold Plates for Hybrid-Electric Vehicle Battery Systems
… cooling for ESS thermal management is the use of phase-change materials (PCMs). PCMs regulate the temperature of the ESS by leveraging the latent heat of fusion to absorb large amounts of energy at constant temperature while changing phase from solid to liquid. While PCMs have large heat …
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Investigation of nanoparticles enriched phase change materials for improved thermal performance of energy storage applications
… of the integration of nanoparticles into phase change materials (PCMs) to improve thermal energy storage (TES) performance across various applications. By leveraging nanoparticles, the thermal conductivity and heat transfer characteristics of PCMs are improved, enabling faster charging and …
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Microencapsulated phase change materials for thermal energy storage: development, evaluation, and application
Phase change materials (PCMs) have received increasing interest lately for potential use in heat transfer and thermal energy storage (TES) applications due to their high energy storage density. The major obstacle limiting more widespread application of PCMs is containment of the liquid phase to …
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Experimental Evaluation of Innovative Thermal Energy Storage Options for a Hypersonic Non-Airbreathing Vehicle's Internal Loads
… have been passive systems based on solid-liquid phase change materials (PCMs), which store thermal energy as they melt. Since space is at a premium, a heat sink must store a lot of energy per unit volume, while keeping components below their maximum temperature. In this project, three heat sink …
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Latent Heat Thermal Energy Storage with Embedded Heat Pipes for Concentrating Solar Power Applications
… is explored. The low thermal conductivity of phase change materials (PCMs) used in LHTES presents a design challenge due to slow heat transfer rates during heating and cooling of the material. Heat pipes act to decrease the thermal resistance in the PCM, increasing the overall heat transfer …
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