The Experts below are selected from a list of 23907 Experts worldwide ranked by ideXlab platform

Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.

  • development of a solar farm powered quadric system with thermal energy Storage Option
    Energy Conversion and Management, 2020
    Co-Authors: Khaled H M Alhamed, Ibrahim Dincer
    Abstract:

    Abstract Due to the increase in energy and fresh water demands and the expected hydrogen economy, it is important to find solutions that can meet these various energy demands. In this study, an investigation of a PV/T powered integrated system for a quadric generation of electricity, hydrogen, fresh water and space heating with a novel thermal energy Storage unit is considered. This study introduces for the first time the upgrading of thermal energy using a high-temperature heat pump for thermal energy Storage by using a combination of excess electric power and waste heat from a PV/T solar farm. After establishing and validating a thermodynamic model to analyze this integrated system, the results show that the energy and exergy coefficients of performance of this heat pump are 1.18 and 0.336, respectively at the base case. Also, the temperature lift is 132.6 K up from 333 K at the PV/T solar farm. The overall energy and exergy efficiencies of the integrated system are found to be 11.6% and 6.49%, respectively. In addition, parametric studies are conducted to investigate how the system performance is affected by changing the operating conditions and state properties, and their results show that, in general, improving the isentropic efficiencies of compressors of the heat pump, enhances the overall performance energetically and exergetically. In regards to the hydrogen production rate, increasing this rate reduces the overall energy and exergy efficiencies of the integrated system respectively from 12.9% and 6.83% at a mass flow rate of 0.01 kg s−1 down to 8.17% and 5.71% at a mass flow rate of 0.035 kg s−1, respectively.

  • Techno-economic analysis of a stand-alone hybrid renewable energy system with hydrogen production and Storage Options
    International Journal of Hydrogen Energy, 2015
    Co-Authors: Yildiz Kalinci, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    In the present study, a hybrid renewable energy system using hydrogen energy as energy Storage Option is conceptually modeled for the Bozcaada Island in Turkey. The system is investigated from the techno-economic point of view. The Hybrid Optimization Model for Electric Renewable (HOMER) tool is used to define the optimum size of the equipment based on the geographical and meteorological data of the island. The HOMER uses the net present cost (NPC) method while ranking the system suitability. Also, the cost of energy (COE) is calculated with the total annual cost (ACT). The study considers two scenarios, which are only wind turbine and wind turbine/PV hybrid systems. Using the wind turbine/PV array system, instead of wind turbine only, decreases the NPC from $14,624,343 to $11,960,698. Also, it decreases the hydrogen tank capacity to 400 kg and hence affects other equipment size and NPC. So, the COE varies between $1.016/kWh and $0.83/kWh. According to this, the optimum system components are defined as PV array-300 kW, wind turbine (E33x2), fuel cell-100 kW, converter-150 kW, electrolyzer-200 kW and hydrogen tank-400 kg to supply a 1875 kWh/d primary load. Furthermore, the effects of some parameters and the equipment on NPC are examined. Increasing potential of the renewable energy sources, such as annual average wind speed or solar radiation, decreases both COE and NPC. While the annual average solar radiation increases to 5 kWh/m2/d, the NPC and COE decrease to $11,673,704 and $0.81/kWh. Likewise, an increase in the annual average wind speed will decrease the costs to $11,452,712 and $0.795/kWh, respectively. Also, increasing the real interest i, to 5% increases the COE to $1.043/kWh, as expected.

Abdul Hai Alami - One of the best experts on this subject based on the ideXlab platform.

  • experimental and numerical investigations of a compressed air energy Storage caes system as a wind energy Storage Option
    2018
    Co-Authors: Abdul Hai Alami, Camilia Aokal, Monadhel Jabar Alchadirchy
    Abstract:

    This paper presents an experimental evaluation of compact compressed air energy Storage (CAES) system. The advantages of such a system are low cost, easy coupling with renewable resources (mainly wind energy), and high efficiency. While the system considered here is compact in size, the results obtained on the performance parameters, such as efficiency of energy conversion and expected electrical output, can be generalized for upscaling purposes. The main challenge with larger systems is the heat generated due to compression, which is not a major issue for the current system. Larger systems, however, enable operating at higher pressures, which means larger stored potential energy which in the case of 1 bar differential gave up to 13% higher kinetic energy.

  • experimental assessment of compressed air energy Storage caes system and buoyancy work energy Storage bwes as cellular wind energy Storage Options
    Journal of energy storage, 2015
    Co-Authors: Abdul Hai Alami
    Abstract:

    Abstract This paper presents the experimental evaluation of two compact energy Storage devices directed towards wind energy Storage applications. The first is a compressed air energy Storage (CAES) system with its low infrastructural cost, easy coupling with existing wind resources and high round-trip efficiency. The second system utilizes the harvesting of the work of buoyancy forces resulting from submerging styrofoam buoys in a liquid at times of abundant energy supply and harnessing energy back by allowing them to ascend when demand arises. While the systems considered here are compact in size, the results obtained on performance parameters such as efficiency of energy conversion and electrical output are sought to be generalized as a Storage Option for real offshore wind farms. The main challenges in designing larger systems are the heat generated due to air compression and the considerable friction drag affecting the buoys. Larger systems, however, have higher potential energy enabling them to operate at higher pressures and depths for the compressed air and the buoyancy systems, respectively. The proposed modular systems, composed of many cells of air cylinders or buoys are expected to decrease heat and friction losses intrinsic to large-scale systems while at the same time reducing infrastructure costs and transmission losses and enhance overall energy efficiency.

Norma Paniego - One of the best experts on this subject based on the ideXlab platform.

  • ATGC transcriptomics: a web-based application to integrate, explore and analyze de novo transcriptomic data
    BMC Bioinformatics, 2017
    Co-Authors: Sergio Gonzalez, Bernardo Clavijo, Máximo Rivarola, Patricio Moreno, Paula Fernandez, Joaquín Dopazo, Norma Paniego
    Abstract:

    Background In the last years, applications based on massively parallelized RNA sequencing (RNA-seq) have become valuable approaches for studying non-model species, e.g., without a fully sequenced genome. RNA-seq is a useful tool for detecting novel transcripts and genetic variations and for evaluating differential gene expression by digital measurements. The large and complex datasets resulting from functional genomic experiments represent a challenge in data processing, management, and analysis. This problem is especially significant for small research groups working with non-model species. Results We developed a web-based application, called ATGC transcriptomics, with a flexible and adaptable interface that allows users to work with new generation sequencing (NGS) transcriptomic analysis results using an ontology-driven database. This new application simplifies data exploration, visualization, and integration for a better comprehension of the results. Conclusions ATGC transcriptomics provides access to non-expert computer users and small research groups to a scalable Storage Option and simple data integration, including database administration and management. The software is freely available under the terms of GNU public license at http://atgcinta.sourceforge.net .

  • ATGC transcriptomics: a web-based application to integrate, explore and analyze de novo transcriptomic data.
    BMC Bioinformatics, 2017
    Co-Authors: Sergio Gonzalez, Bernardo Clavijo, Máximo Rivarola, Patricio Moreno, Paula Fernandez, Joaquín Dopazo, Norma Paniego
    Abstract:

    In the last years, applications based on massively parallelized RNA sequencing (RNA-seq) have become valuable approaches for studying non-model species, e.g., without a fully sequenced genome. RNA-seq is a useful tool for detecting novel transcripts and genetic variations and for evaluating differential gene expression by digital measurements. The large and complex datasets resulting from functional genomic experiments represent a challenge in data processing, management, and analysis. This problem is especially significant for small research groups working with non-model species. We developed a web-based application, called ATGC transcriptomics, with a flexible and adaptable interface that allows users to work with new generation sequencing (NGS) transcriptomic analysis results using an ontology-driven database. This new application simplifies data exploration, visualization, and integration for a better comprehension of the results. ATGC transcriptomics provides access to non-expert computer users and small research groups to a scalable Storage Option and simple data integration, including database administration and management. The software is freely available under the terms of GNU public license at http://atgcinta.sourceforge.net .

Th. Wetzel - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of thermal energy Storage Options in a sodium-based CSP plant
    Applied Thermal Engineering, 2016
    Co-Authors: Klarissa Niedermeier, J. Flesch, Luca Marocco, Th. Wetzel
    Abstract:

    Abstract Sodium has proven to be an efficient heat transport fluid in a central receiver system in the IEA-SSPS facility in Almeria in the 1980s with a 5 MWh th direct two tank Storage system. In recent years the interest in liquid metals, particularly sodium, as heat transfer fluids for concentrating solar power has reawakened. However, an assessment of thermal energy Storage Options in a liquid metal-based concentrating solar power system has not been performed yet. In this paper sensible, latent and thermochemical systems, described in the literature and potentially suitable for a solar power plant using sodium, are investigated. As sensible systems, direct sodium two tank and one tank thermocline Storage systems with filler are considered, as well as indirect molten salt systems. Latent systems include configurations with finned tubes, packed beds of phase change material capsules and active screw type systems. In addition, metal hydride dehydrogenation, ammonia dissociation and hydroxide dehydration are considered as thermochemical Storage systems. The presented Storage systems are discussed and compared on the basis of the following criteria: Storage medium cost, Storage density, cycling behaviour, maturity level and suitability for sodium as heat transfer fluid. As a result, the direct sodium thermocline one tank Storage with filler material represents a promising direct Storage Option. It could be further enhanced by a cascaded arrangement of phase change capsules. Moreover, the thermochemical Storage systems based on ammonia dissociation or hydroxide dehydration are identified as best indirect Storage Options.

Onder Guler - One of the best experts on this subject based on the ideXlab platform.

  • techno economic analysis of off grid pv wind fuel cell hybrid system combinations with a comparison of regularly and seasonally occupied households
    Sustainable Cities and Society, 2018
    Co-Authors: Can A Duman, Onder Guler
    Abstract:

    Abstract In Turkey, it is common to move to seasonal vacation homes/second homes during summer months. Electrical energy demand of these homes, which are usually located in the coastal regions where solar radiation is high, can be met by renewable energy sources. In this study, meeting electrical energy demand of off-grid vacation homes via photovoltaic/wind/fuel cell hybrid energy systems is investigated from a techno-economical perspective. 24 different simulations were performed in the HOMER software under geographic and climatic conditions of Cesme, Izmir that has relatively high solar and wind energy potential for Turkey conditions and is a place where seasonal vacation homes are located. Two occupancy scenarios (seasonal and regular) of the households were investigated under two Storage Options (hydrogen and battery) and each Storage Option consisted of six hybrid system configurations (three 100% renewable + three minimum 95% renewable). As a result, the levelized cost of electricity (COE) of off-grid renewable energy systems are found to be above the cost of grid electricity, however, a lot less when compared to previous years. The techno-economic analysis showed that, battery Storage, which is a more mature technology, is still economically superior to hydrogen Storage.