Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Experimental Setup for Thermal Performance Study of Phase Change Material Admixed Cement Composites—A Review(Springer Science and Business Media Deutschland GmbH info@springer-sbm.com, 2021) Snehal, K.; Das, B.B.Phase change material (PCM) is a prospective material with a caliber to store thermal energy. The hasty development in the modern world and lavish life style amplified the energy demand. Building and infrastructure are the leading energy and material consumers over the globe. Conservation of building energy associated to heating and cooling is made possible by embedding PCM in construction materials (like concrete) which has a great potential to improve the thermal comfort of the residents. The concrete coupled with PCMs has a tendency to improve the thermophysical properties like heat capacity/thermal mass and thermal insulating property besides with an ability to save energy for the development of sustainable built environment. There are so many techniques and experimental setups used by the researchers to analyze the thermal performance of PCM-admixed cementitious systems. In line to this, an attempt has been made to review the different experimental setup used by various researchers to study the thermal facets (heat capacity, thermal cycle, thermal conductivity, etc.) of PCM-doped cementitious systems. © 2021, Springer Nature Singapore Pte Ltd.Item Multi-objective optimization of various type finned heat sink with phase change materials (PCM)(Institute of Physics, 2022) Muthamil Selvan, N.; Trilok, G.; Gnanasekaran, N.The paper focuses on optimizing hybrid PCM filled heat sinks with a multi-objective approach. In the current study, the fins are oriented both horizontally at the sidewalls and vertically at the bottom side in the enclosure. Two heat sinks with different types of fin shapes are introduced in the enclosure. A rectangular shape finned heat sink, and a tapered shape finned heat sink is incorporated in both sidewalls and bottom walls. The study's main goal is to optimize the PCM-based heat sink to prolong the charging cycle (melting) and shorten the discharging cycle (solidification). The PCM used in the study is n-eicosane, and the material for the heat sink is aluminum. A heat flux with constant supply of 2000 W/m2 is provided at the enclosure bottom, and the remaining walls are insulated. A 2-D numerical simulation is done using the commercial software ANSYS Fluent. The multi-objective optimization is carried out using the technique for order preference by similarity to ideal solution (TOPSIS) optimization technique. For a constant PCM volume for both the cases, fin spacing, fin positioning, and fin heights are varied. The output results determined the optimum configuration for the stretched melting period and minimized solidification period. © Published under licence by IOP Publishing Ltd.Item Impact of Phase Change Materials on the Durability Properties of Cementitious Composites—A Review(Springer Science and Business Media Deutschland GmbH, 2023) Vismaya, K.; Snehal, K.; Das, B.B.Phase change materials (PCMs) are the novel thermal storage materials which have an ability to engross and dispel heat during the process of phase transition from solid to liquid and vice versa. Utilization of PCMs in cementitious composites has gained a lot of attention from the research fraternity to minimize the energy loadings used for space conditioning and heating in building. Impact of PCM’s presence in cementitious composites on the durability parameters is the need for its better usage. This paper gives the state of review on the influence of inclusion of phase change materials in the cementitious system on its various durability aspects. Durability properties such as porosity, water absorption, shrinkage, chloride ingression, and chemical attacks are compiled in this article. It is stated that the integration of PCM in cement composites enhances the porosity of cementitious system. Major hindrance described by the researchers is the interruption of hydration activity of cementitious system by the addition of PCM. Literature also signified that the micro/nano encapsulates PCMs and the use of highly reactive Pozzolans such as silica fume or nano-silica in conjunction with PCMs has the ability to lock up the limitations of PCMs. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Performance Comparison of Different Geometries of Thermal Energy Storage Unit for Solar Cooker(Springer Science and Business Media Deutschland GmbH, 2023) Anilkumar, B.C.; Maniyeri, R.; Anish, S.Many researchers have been interested in solar energy as an unlimited energy resource over the last few decades due to its vast range of applications, including household cooking. The present work aims to design, optimize, fabricate, and test different geometries of thermal energy storage (TES) units for solar cooker (SC) using paraffin wax as the phase change material (PCM). The optimum amount of PCM necessary for different geometries (cylindrical, square, and hexagonal) of TES units surrounding the cooking vessel is computed using a computational approach. The TES units developed in this study have the provisions for filling the PCM on all sides, including the lid, enhancing the heat transfer to the cooking load. The performance comparison of different TES units is carried by conducting the indoor test. The experimental findings show that after 6 h, all geometries of TES units maintain the temperature of the cooking load at the melting point of PCM. However, cylindrical-shaped TES unit performs best in comparison with hexagonal and square. A cylindrical box solar cooker performance test is also carried out with an optimized cooking vessel surrounded by the PCM-filled TES unit and lid. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.