The Experts below are selected from a list of 217581 Experts worldwide ranked by ideXlab platform

Viktoria Martin - One of the best experts on this subject based on the ideXlab platform.

  • submerged finned heat exchanger latent heat Storage Design and its experimental verification
    Applied Energy, 2012
    Co-Authors: Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Thermal energy Storage (TES) has shown potential in improving the overall performance in energy systems, through shifting of thermal load demand, and through matching of uneven energy availability in time and in space. Latent heat TESs demonstrate advantages over sensible heat TESs for their high Storage density and small temperature swing; however, lack of accurate knowledge in novel material properties and lack in a holistic Design protocol often lead to difficulties in reaching technically viable Storage Design. With the aim of proposing a sound latent heat based TES Design-to-validation protocol, this paper covers material property characterization through Temperature-history (T-history) method, heat exchanger Design through heat transfer modeling, and model validation through experimental verification. A model for submerged cylindrically finned heat exchanger latent heat Storage unit with phase change material was built. The results show that performance of gelled salt-hydrate based TES can be assessed with a pure conduction based model. This material property characterization-to-model verification approach may serve as a standard in providing accurate Storage Design for performance evaluation.

  • submerged finned heat exchanger latent heat Storage Design and its experimental verification
    Applied Energy, 2012
    Co-Authors: Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Thermal energy Storage (TES) has shown potential in improving the overall performance in energy systems, through shifting of thermal load demand, and through matching of uneven energy availability ...

  • impact of convective heat transfer mechanism in latent heat Storage modeling
    InnoStock 2012 The 12th International Conference on Energy Storage 16-18 May 2012 Lleida Spain, 2012
    Co-Authors: Petter Johansson, Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Equating Earth’s existence to 24 hours, we, the Homo sapiens, came about in the last four seconds. Fossil fuel came to our knowledge with mass extraction dating from the Industrial Revolution two centuries ago, in other words 4 milliseconds out of Earth’s 24-hour equivalent lifetime. With the unruly use of fossil fuel based resources, global temperature increase due to anthropogenic emission is projected by the Intergovernmental Panel on Climate Change (IPCC) to increase between 2 °C and 6 °C by 2100. The expected results are unprecedented climatic phenomena, such as intense tropical cyclones, extreme heat waves, and heavy precipitation among others. Limiting climate change has become one of the most discerning issues in our highly energy dependent society.Ever-increasing energy demand goes in hand with improved living standard due to technologic and economic progress. Behavioral change is one of the ultimate solutions to reduce energy demand through adequate life style change; however such approach requires societal paradigm shift. In this thesis, we look into using energy Storage technology to peak shave and to load shift energy so as to attain increased renewable energy source utilization, improved system’s energy efficiency, and reduced Greenhouse Gas (GHG) emission without compromising living comfort.High energy density thermal energy Storage (TES) systems utilize phase change materials as Storage mediums where thermal energy is principally stored in the form of latent heat (LH). Advantages of such systems are compact components and small Storage temperature swing. However, challenges remain in implementing LHTES to the built environment, namely lack of understanding of system dynamics, uncertainty in component Design, and non-documented material property are to be addressed.The goal of this thesis is to address the issues on material property characterization, on component heat transfer study and on system integration. A methodology in measuring material’s thermo physical property through T-History setup is defined. Caveats of existing methodology are presented and improvements are proposed. The second part of this thesis consists of establishing valid numerical models of LHTES component for both shape stabilized and free flowing PCMs. Experimental verifications were performed and models were validated. Improvement to the thermal power performance was studied and was reached with multistage multi-PCM Storage Design. Techno-economic optimization and parametric study were carried out for transient TES integrated system study. Finally, an estimation of the Swedish peak energy demand reduction was performed through study of TES implementation to the existing energy systems. The peak energy shave attained through TES implementation determines the amount of fossil fuel based marginal energy that can be reduced for a greener environment.

Justin Ningwei Chiu - One of the best experts on this subject based on the ideXlab platform.

  • submerged finned heat exchanger latent heat Storage Design and its experimental verification
    Applied Energy, 2012
    Co-Authors: Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Thermal energy Storage (TES) has shown potential in improving the overall performance in energy systems, through shifting of thermal load demand, and through matching of uneven energy availability in time and in space. Latent heat TESs demonstrate advantages over sensible heat TESs for their high Storage density and small temperature swing; however, lack of accurate knowledge in novel material properties and lack in a holistic Design protocol often lead to difficulties in reaching technically viable Storage Design. With the aim of proposing a sound latent heat based TES Design-to-validation protocol, this paper covers material property characterization through Temperature-history (T-history) method, heat exchanger Design through heat transfer modeling, and model validation through experimental verification. A model for submerged cylindrically finned heat exchanger latent heat Storage unit with phase change material was built. The results show that performance of gelled salt-hydrate based TES can be assessed with a pure conduction based model. This material property characterization-to-model verification approach may serve as a standard in providing accurate Storage Design for performance evaluation.

  • submerged finned heat exchanger latent heat Storage Design and its experimental verification
    Applied Energy, 2012
    Co-Authors: Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Thermal energy Storage (TES) has shown potential in improving the overall performance in energy systems, through shifting of thermal load demand, and through matching of uneven energy availability ...

  • impact of convective heat transfer mechanism in latent heat Storage modeling
    InnoStock 2012 The 12th International Conference on Energy Storage 16-18 May 2012 Lleida Spain, 2012
    Co-Authors: Petter Johansson, Justin Ningwei Chiu, Viktoria Martin
    Abstract:

    Equating Earth’s existence to 24 hours, we, the Homo sapiens, came about in the last four seconds. Fossil fuel came to our knowledge with mass extraction dating from the Industrial Revolution two centuries ago, in other words 4 milliseconds out of Earth’s 24-hour equivalent lifetime. With the unruly use of fossil fuel based resources, global temperature increase due to anthropogenic emission is projected by the Intergovernmental Panel on Climate Change (IPCC) to increase between 2 °C and 6 °C by 2100. The expected results are unprecedented climatic phenomena, such as intense tropical cyclones, extreme heat waves, and heavy precipitation among others. Limiting climate change has become one of the most discerning issues in our highly energy dependent society.Ever-increasing energy demand goes in hand with improved living standard due to technologic and economic progress. Behavioral change is one of the ultimate solutions to reduce energy demand through adequate life style change; however such approach requires societal paradigm shift. In this thesis, we look into using energy Storage technology to peak shave and to load shift energy so as to attain increased renewable energy source utilization, improved system’s energy efficiency, and reduced Greenhouse Gas (GHG) emission without compromising living comfort.High energy density thermal energy Storage (TES) systems utilize phase change materials as Storage mediums where thermal energy is principally stored in the form of latent heat (LH). Advantages of such systems are compact components and small Storage temperature swing. However, challenges remain in implementing LHTES to the built environment, namely lack of understanding of system dynamics, uncertainty in component Design, and non-documented material property are to be addressed.The goal of this thesis is to address the issues on material property characterization, on component heat transfer study and on system integration. A methodology in measuring material’s thermo physical property through T-History setup is defined. Caveats of existing methodology are presented and improvements are proposed. The second part of this thesis consists of establishing valid numerical models of LHTES component for both shape stabilized and free flowing PCMs. Experimental verifications were performed and models were validated. Improvement to the thermal power performance was studied and was reached with multistage multi-PCM Storage Design. Techno-economic optimization and parametric study were carried out for transient TES integrated system study. Finally, an estimation of the Swedish peak energy demand reduction was performed through study of TES implementation to the existing energy systems. The peak energy shave attained through TES implementation determines the amount of fossil fuel based marginal energy that can be reduced for a greener environment.

H Price - One of the best experts on this subject based on the ideXlab platform.

  • parabolic trough solar power plant simulation model preprint
    2003
    Co-Authors: H Price
    Abstract:

    As interest for clean renewable electric power technologies grows, a number of parabolic trough power plants of various configurations are being considered for deployment around the globe. It is essential that plant Designs be optimized for each specific application. The optimum Design must consider the capital cost, operations and maintenance cost, annual generation, financial requirements, and time-of-use value of the power generated. Developers require the tools for evaluating tradeoffs between these various project elements. This paper provides an overview of a computer model that is being used by scientists and developers to evaluate the tradeoff between cost, performance, and economic parameters for parabolic trough solar power plant technologies. An example is included that shows how this model has been used for a thermal Storage Design optimization.

  • a parabolic trough solar power plant simulation model
    Solar Energy, 2003
    Co-Authors: H Price
    Abstract:

    As interest for clean renewable electric power technologies grows, a number of parabolic trough power plants of various configurations are being considered for deployment around the globe. It is essential that plant Designs be optimized for each specific application. The optimum Design must consider the capital cost, operations and maintenance cost, annual generation, financial requirements, and time-of-use value of the power generated. Developers require the tools for evaluating tradeoffs between these various project elements. This paper provides an overview of a computer model that is being used by scientists and developers to evaluate the tradeoff between cost, performance, and economic parameters for parabolic trough solar power plant technologies. An example is included which shows how this model has been used for a thermal Storage Design optimization.Copyright © 2003 by ASME

Xavier Py - One of the best experts on this subject based on the ideXlab platform.

  • application of material assessment methodology in latent heat thermal energy Storage for waste heat recovery
    Applied Energy, 2017
    Co-Authors: Haoxin Xu, Alessandro Romagnoli, Xavier Py
    Abstract:

    This study proposes a comprehensive and systematic methodology of Phase Change Materials assessment for Latent Heat Thermal Energy Storage Design, which comprises prescreening, ranking and performance objective examination based on Multi-Criteria Decision Making tools. Firstly, a large candidate pool is pre-screened with crucial boundary constraints. The materials are then ranked by employing the Analytical Hierarchy Process and Techniques for Order Preference by Similarity to Ideal Solutions. Three distinctive objective functions are suggested to explicitly evaluate the performance of Phase Change Materials. Pareto solutions and Utopia points are additional tools in the performance objective examination. A good agreement observed between assessment results and a building thermal comfort simulation results from literature validated the proposed methodology. For the first time, performance assessment of Phase Change Materials with the methodology is carried out in an initial Design phase of a Latent Heat Thermal Energy Storage system for Waste Heat Recovery application in a cogeneration plant. The performance of prescreened PCMs is evaluated and the results provides a clear ranking list and quantitative performance indicators which will provide a high level of confidence in selecting the best performing materials during the Design phase.

Wu Robert - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory-scale assessment of a capillary barrier using fibre optic distributed temperature sensing (FO-DTS)
    NRC Research Press (a division of Canadian Science Publishing), 2019
    Co-Authors: Wu Robert, Martin Vincent, Mckenzie Jeffrey, Broda Stefan, Bussière Bruno, Aubertin Michel, Kurylyk, Barret L.
    Abstract:

    Recent waste rock pile Designs have been proposed to incorporate a fine-grained layer to create a capillary barrier to prevent surface water from draining into the pile interior. This study analyses active fibre optic distributed temperature sensing (FO-DTS) as a tool to measure the effectiveness a capillary barrier system following an infiltration test. A laboratory waste rock column was built with anorthosite waste rock overlain by sand. Volumetric water content is calculated during heat cycles lasting 15 min powered at 15 W/m in the column. A new algorithm is employed to circumvent several requirements for soil specific calibration. The inferred moisture contents were verified by soil moisture probes located adjacent to the cable. The FO-DTS data indicate, at vertical resolutions up to 2 cm, that water is retained in the sand and does not drain into the anorthosite following the infiltration test. The coefficient of determination, R2, between the inferred and measured volumetric water content in the fine cover sand layer is 0.90, while the screened anorthosite maintained an R2 of 0.94 with constant moisture content throughout the test. This study will ultimately help guide future waste rock Storage Design initiatives incorporating fibre optic sensors, leading to improved environmental mine waste management.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

  • Laboratory Scale Assessment of a Capillary Barrier using Fibre Optic Distributed Temperature Sensing (FO-DTS)
    McGill University, 2019
    Co-Authors: Wu Robert, Martin Vincent, Mckenzie Jeffrey, Broda Stefan, Bussière Bruno, Aubertin Michel, Kuryluk, Barret L.
    Abstract:

    Recent waste rock pile Designs have been proposed to incorporate a fine-grained layer to create a capillary barrier to prevent surface water from draining into the pile interior. This study analyse active fibre optic distributed temperature sensing (FO-DTS) as a tool to measure the effectiveness a capillary barrier system following an infiltration test. A laboratory waste rock column was built with anorthosite waste rock overlain by sand. Volumetric water content is calculated during heat cycles lasting 15 min powered at 15 W/m in the column. A new algorithm is employed to circumvent several requirements for soil specific calibration. The inferred moisture contents were verified by soil moisture probes located adjacent to the cable. The FO-DTS data indicate, at vertical resolutions up to 2 cm, that water is retained in the sand and does not drain into the anorthosite following the infiltration test. The R2 between the inferred and measured volumetric water content in the fine cover sand layer is 0.90, while the screened anorthosite maintained an R2 of 0.94 with constant moisture content throughout the test. This study will ultimately help guide future waste rock Storage Design initiatives incorporating fibre optic sensors, leading to improved environmental mine waste management