The Experts below are selected from a list of 5502 Experts worldwide ranked by ideXlab platform

Gholamreza Karimi - One of the best experts on this subject based on the ideXlab platform.

  • Thermal properties measurement and heat storage analysis of paraffinnanoparticles composites phase change material: Comparison and optimization
    Applied Thermal Engineering, 2015
    Co-Authors: Aziz Babapoor, Gholamreza Karimi
    Abstract:

    Thermo-physical properties of phase change materials (PCMs) are important in latent heat Thermal energy storage applications. At high heat flux levels, the Poor Thermal Conductivity of PCMs limits their Thermal control performance. This problem can be solved by employing composite materials with a better heat conducting matrix. In this study, various nanoparticles such as SiO2, Al2O3, Fe2O3, ZnO and their combinations were used as Thermal Conductivity promoter to produce modified paraffin samples by direct-synthesis method. Thermal properties such as phase change temperatures, latent heat of melting and solidification and heat capacities of composites were measured by differential scanning calorimetric technique. Morphological properties identifying the components that make up the sample and dispersion of nanoparticles in paraffin mixture were characterized using scanning electron microscopy. Measurements show that Thermal Conductivity and diffusivity of the composites are substantially enhanced by increasing the nanoparticles mass fractions at the tested temperature. The best result was obtained for samples containing Al2O3 nanoparticles. The lowest decrease in latent heat was also observed for PCM with Al2O3 nanoparticles. As a conclusion, Al2O3 nanoparticles showed significant potential for enhancing the Thermal storage characteristics of the paraffin mixture.

Noel Leon - One of the best experts on this subject based on the ideXlab platform.

  • high temperature latent heat Thermal energy storage phase change materials design considerations and performance enhancement techniques
    Renewable & Sustainable Energy Reviews, 2013
    Co-Authors: Bruno Cardenas, Noel Leon
    Abstract:

    Abstract A very common problem in solar power generation plants and various other industrial processes is the existing gap between the period of Thermal energy availability and its period of usage. This situation creates the need for an effective method by which excess heat can be stored for later use. Latent heat Thermal energy storage is one of the most efficient ways of storing Thermal energy through which the disparity between energy production or availability and consumption can be corrected, thus avoiding wastage and increasing the process efficiency. This paper reviews a series of phase change materials, mainly inorganic salt compositions and metallic alloys, which could potentially be used as storage media in a high temperature (above 300 °C) latent heat storage system, seeking to serve the reader as a comprehensive thermophysical properties database to facilitate the material selection task for high temperature applications. Widespread utilization of latent heat storage systems has been held back by the Poor Thermal Conductivity and some other inherent drawbacks of the use of PCMs; this paper reviews several heat transfer and performance enhancement techniques proposed in the literature and discusses a number of design considerations that must be taken into account aiming to provide a broad overview for the design of high temperature latent heat based Thermal energy storage systems.

Valan Arasu Amirtham - One of the best experts on this subject based on the ideXlab platform.

  • a review on Thermal Conductivity enhancement of paraffinwax as latent heat energy storage material
    Renewable & Sustainable Energy Reviews, 2016
    Co-Authors: Prabhu Bose, Valan Arasu Amirtham
    Abstract:

    Abstract Increasing energy demand calls for the implementation of proper Thermal energy storage which is one of the most important components of solar energy conversion systems. Phase change material based latent heat energy storage systems have emerged as a promising option to effectively store Thermal energy. Generally, paraffin wax is used as the most common phase change material for low to medium temperature storage applications because it has a large latent heat and low cost besides being stable, nontoxic and non-corrosive. The performance of paraffin wax based latent heat energy storage systems (LHESS) is limited by its Poor Thermal Conductivity. In this paper, the previous experimental and theoretical research studies on LHESS using paraffin wax as phase change material with different performance enhancement techniques are reviewed. Further, research works related to dispersing different kind of nanoparticles in paraffin wax for the enhancement of its Thermal Conductivity are comprehensively reviewed with respect to synthesis, characterization and thermophysical properties of the nanoenhanced phase change material.

Yang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation and analysis of a vertical heat pipe latent Thermal energy storage system with fins copper foam combination
    Applied Thermal Engineering, 2020
    Co-Authors: Chunwei Zhang, Yubin Fan, Xuejun Zhang, Yang Zhao
    Abstract:

    Abstract As one of the most promising Thermal storage techniques, latent Thermal energy storage (LTES) using phase change materials (PCMs) is gaining importance. However, as is well known, most PCMs still suffer from the Poor Thermal Conductivity for both the solid and liquid phases. To overcome this drawback, a combination of fins and copper foam based on the heat pipe (HP) heat exchanger is proposed and applied. The Thermal performances, including the liquid fraction, the exergy transfer rate, the evolution of solid-liquid interfaces, and temperature distributions are evaluated by a two-dimensional numerical model considering natural convection. The results indicate that the combination shows a greater enhancement performance than using either copper foam alone or fins alone, and the best enhancement can be achieved with a specific fin volume ratio (γfin = 0.5) when the total volume fraction is fixed. Besides, the exergy analysis further suggests that increasing the total volume fraction accelerates the phase change rate by improving the effective Thermal Conductivity, but meanwhile, the impact of natural convection is gradually reduced. This study illustrates an effective method for enhancing the heat transfer of LTES by combining different techniques.

S.d. Pohekar - One of the best experts on this subject based on the ideXlab platform.

  • performance enhancement in latent heat Thermal storage system a review
    Renewable & Sustainable Energy Reviews, 2009
    Co-Authors: S. Jegadheeswaran, S.d. Pohekar
    Abstract:

    Phase change material (PCM) based latent heat Thermal storage (LHTS) systems offer a challenging option to be employed as an effective energy storage and retrieval device. The performance of LHTS systems is limited by the Poor Thermal Conductivity of PCMs employed. Successful large-scale utilization of LHTS systems thus depends on the extent to which the performance can be improved. A great deal of work both experimental and theoretical on different performance enhancement techniques has been reported in the literature. This paper reviews the implementation of those techniques in different configurations of LHTS systems. The influence of enhancement techniques on the Thermal response of the PCM in terms of phase change rate and amount of latent heat stored/retrieved has been addressed as a main aspect. Issues related to mathematical modeling of LHTS systems employing enhancement techniques are also discussed.