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Leyla Ozgener - One of the best experts on this subject based on the ideXlab platform.

  • Coefficient of performance (COP) analysis of geothermal district Heating Systems (GDHSs): Salihli GDHS case study
    Renewable & Sustainable Energy Reviews, 2012
    Co-Authors: Leyla Ozgener
    Abstract:

    The purpose of this survey is about to analyze the Heating coefficient of performance (COP) of geothermal district Heating Systems. Actual system data are taken from the Salihli GDHS, Turkey. The collected data are quantified and illustrated in tables, particularly for a reference temperature for comparison purposes. In this study, firstly energy and COP analysis of the GDHSs is introduced and then Salihli GDHS coefficient of performance results is given as a case study. Moreover, this paper offers an interesting empirical study of certain geothermal Systems.

  • monitoring of energy exergy efficiencies and exergoeconomic parameters of geothermal district Heating Systems gdhss
    Applied Energy, 2009
    Co-Authors: Leyla Ozgener, Onder Ozgener
    Abstract:

    In this work, the monitoring energy and exergy efficiency results of the last Heating seasons of operation of the geothermal district Heating Systems (GDHSs) and their technical availability analysis and monitoring exergoeconomic parameters are presented. The case studies cover the actual system data taken from the Systems in Afyon and Salihli GDHSs, Turkey. General energy, exergy, technical availability, and exergoeconomic analysis of the GDHSs are introduced. Furthermore, the average technical availability, real availability, capacity factor and energy and exergy efficiencies value of GDHSs have been analyzed.

  • thermomechanical exergy and thermoeconomic analysis of geothermal district Heating Systems
    Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 2008
    Co-Authors: Leyla Ozgener, Onder Ozgener
    Abstract:

    AbstractThe current paper presents the thermomechanical exergy and thermoeconomic analysis of geothermal district Heating Systems (GDHSs) in Turkey. The case studies cover the actual system data taken from the Systems in Afyon, Gonen, and Salihli GDHSs, Turkey. General energy and exergy analysis of the GDHSs are introduced. Then the analysis applied to these GDHSs using actual thermodynamic data for their performance evaluations in terms of energy and exergy efficiencies are presented. Besides, thermoeconomic evaluations of GDHSs are given in tables.

  • A key review on performance improvement aspects of geothermal district Heating Systems and applications
    Renewable & Sustainable Energy Reviews, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    This paper deals with a comprehensive analysis and discussion of geothermal district Heating Systems and applications. In this regard, case studies are presented to study the thermodynamic aspects in terms of energy and exergy and performance improvement opportunities of three geothermal district Heating Systems, namely (i) Balcova geothermal district Heating system (BGDHS), (ii) Salihli geothermal district Heating system (SGDHS), and (iii) Gonen geothermal district Heating system (GGDHS) installed in Turkey. Energy and exergy modeling of geothermal district Heating Systems for system analysis and performance evaluation are given, while their performances are evaluated using energy and exergy analysis method. Energy and exergy specifications are presented in tables. In the analysis, the actual system operational data are utilized. In comparison of the local three district Heating Systems with each other, it is found that the SGDHS has highest energy efficiency, while the GGDHS has highest exergy efficiency.

  • Exergoeconomic analysis of geothermal district Heating Systems: A case study
    Applied Thermal Engineering, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    An exergoeconomic study of geothermal district Heating Systems through mass, energy, exergy and cost accounting analyses is reported and a case study is presented for the Salihli geothermal district Heating system (SGDHS) in Turkey to illustrate the present method. The relations between capital costs and thermodynamic losses for the system components are also investigated. Thermodynamic loss rate-to-capital cost ratios are used to show that, for the devices and the overall system, a systematic correlation appears to exist between capital cost and exergy loss (total or internal), but not between capital cost and energy loss or external exergy loss. Furthermore, a parametric study is conducted to determine how the ratio of thermodynamic loss rate to capital cost changes with reference temperature and to develop a correlation that can be used for practical analyses. The correlations may imply that devices in successful district Heating Systems such as the SGDHS are configured so as to achieve an overall optimal design, by appropriately balancing the thermodynamic (exergy-based) and economic (cost) characteristics of the overall Systems and their devices.

Sven Werner - One of the best experts on this subject based on the ideXlab platform.

  • risk assessment of industrial excess heat recovery in district Heating Systems
    Energy, 2018
    Co-Authors: Kristina Lygnerud, Sven Werner
    Abstract:

    The recovery of industrial excess heat for use in district Heating Systems can be characterised by great political interest, high potential, low utilisation and often high profitability. These char ...

  • Large heat pumps in Swedish district Heating Systems
    Renewable & Sustainable Energy Reviews, 2017
    Co-Authors: Helge Averfalk, Urban Persson, Paul Ingvarsson, Mei Gong, Sven Werner
    Abstract:

    Power-to-heat solutions like heat pumps and electric boilers are foreseen to be possible future tools to stabilise international power markets with high proportions of variable power supply. Temporary low cost electricity can be used for heat generation at times with high availability of wind and solar power through substitution of ordinary heat supply, hence contributing to increased energy system sustainability. Power-to-heat installations in district Heating Systems are competitive due to low specific investment and installation costs for large electric boilers, heat pumps, and heat storages. Several large-scale heat pumps were installed in Swedish district Heating Systems during the 1980s, since a national electricity surplus from new nuclear power existed for some years. The aim of this paper is to summarise the accumulated operation experiences from these large Swedish heat pumps to support and facilitate planning of future power-to-heat solutions with heat pumps in district Heating Systems. Gained experiences consider; installed capacities, capacity utilisation, heat sources used, refrigerant replacements, refrigerant leakages, and wear of mechanical components. The major conclusion is that many of the large thirty-year-old heat pumps are still in operation, but with reduced capacity utilisation due to internal competition from waste and biomass cogeneration plants in the district Heating Systems.

  • risk of industrial heat recovery in district Heating Systems
    Energy Procedia, 2017
    Co-Authors: Kristina Lygnerud, Sven Werner
    Abstract:

    Abstract Industrial heat recovery can be used in district Heating Systems. It is a possibility to make use of heat that is otherwise lost. Increased usage of industrial heat recovery reduces the need for fuel combustion lowering green-house gas (GHG) emissions, such as CO2. Industrial companies can, however, move or close down industrial activities. This is apprehended as a risk and lowers the interest of district Heating companies to invest in industrial heat recovery. In Swedish district Heating Systems, industrial heat recoveries have been undertaken since 1974. Today, the heat recovery is active in about seventy Systems. This leads to the question of how risky it is, for district Heating companies, to engage in industrial heat recovery. Over forty years of operation statistics have been collected and analyzed in order to estimate the risk of industrial heat recovery to district Heating companies. Key results show that the risk is not linked to different industrial branches. Recommendations include suggestions to management on how to consider risk and consequence when assessing potential industrial heat recovery investments.

  • transformation roadmap from high to low temperature district Heating Systems annex xi final report
    2017
    Co-Authors: Helge Averfalk, Sven Werner, Clemens Felsmann, Karin Ruhling, Robin Wiltshire, Svend Svendsen
    Abstract:

    Transformation Roadmap from High to Low Temperature District Heating Systems : Annex XI final report

  • The introduction and expansion of biomass use in Swedish district Heating Systems
    Biomass & Bioenergy, 2016
    Co-Authors: Karin Ericsson, Sven Werner
    Abstract:

    District Heating satisfies about 60% of the heat demand in Swedish buildings. Today, more than two thirds of the heat supply to the district Heating Systems is based on biomass and waste, and biomass alone accounts for about half of the heat supply. The purpose of this paper is to present the Swedish experiences of introducing and expanding the use of biomass in the district Heating Systems and to identify the main drivers behind this development. Our five research questions and the corresponding conclusions consider the driving forces from energy policy tools and local initiatives, the biomass prices, the established infrastructures in forestry and district Heating, the technology paths for biomass conversion, and finally the future challenge of competing uses of biomass.

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

  • investigation of some renewable energy and exergy parameters for two geothermal district Heating Systems
    International Journal of Exergy, 2011
    Co-Authors: C Coskun, Zuhal Oktay, Ibrahim Dincer
    Abstract:

    In this study, three new exergy parameters, namely total exergy destruction ratio, component exergy destruction ratio and dimensionless exergy destruction are introduced in addition to energetic renewability ratio, exergetic renewability ratio, energetic reinjection ratio and exergetic reinjection ratio, and compared for Edremit and Bigadic Geothermal District Heating Systems (GDHSs) based on their actual data. The respective daily graphs of these parameters are presented. Also, regression analyses using the actual data are performed to obtain some correlations for practical use. In brief, these parameters help us to identify the degree of renewability and other aspects and provide some insights.

  • A key review on performance improvement aspects of geothermal district Heating Systems and applications
    Renewable & Sustainable Energy Reviews, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    This paper deals with a comprehensive analysis and discussion of geothermal district Heating Systems and applications. In this regard, case studies are presented to study the thermodynamic aspects in terms of energy and exergy and performance improvement opportunities of three geothermal district Heating Systems, namely (i) Balcova geothermal district Heating system (BGDHS), (ii) Salihli geothermal district Heating system (SGDHS), and (iii) Gonen geothermal district Heating system (GGDHS) installed in Turkey. Energy and exergy modeling of geothermal district Heating Systems for system analysis and performance evaluation are given, while their performances are evaluated using energy and exergy analysis method. Energy and exergy specifications are presented in tables. In the analysis, the actual system operational data are utilized. In comparison of the local three district Heating Systems with each other, it is found that the SGDHS has highest energy efficiency, while the GGDHS has highest exergy efficiency.

  • Exergoeconomic analysis of geothermal district Heating Systems: A case study
    Applied Thermal Engineering, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    An exergoeconomic study of geothermal district Heating Systems through mass, energy, exergy and cost accounting analyses is reported and a case study is presented for the Salihli geothermal district Heating system (SGDHS) in Turkey to illustrate the present method. The relations between capital costs and thermodynamic losses for the system components are also investigated. Thermodynamic loss rate-to-capital cost ratios are used to show that, for the devices and the overall system, a systematic correlation appears to exist between capital cost and exergy loss (total or internal), but not between capital cost and energy loss or external exergy loss. Furthermore, a parametric study is conducted to determine how the ratio of thermodynamic loss rate to capital cost changes with reference temperature and to develop a correlation that can be used for practical analyses. The correlations may imply that devices in successful district Heating Systems such as the SGDHS are configured so as to achieve an overall optimal design, by appropriately balancing the thermodynamic (exergy-based) and economic (cost) characteristics of the overall Systems and their devices.

  • Exergy analysis of two geothermal district Heating Systems for building applications
    Energy Conversion and Management, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    Abstract This study evaluates the exergetic performance of two local Turkish geothermal district Heating Systems through exergy analysis. The exergy destructions in these geothermal district Heating Systems are quantified and illustrated using exergy flow diagrams for a reference temperature of 1 °C using the 2003 and 2004 actual seasonal Heating data. The results indicate that the exergy destructions in these Systems particularly occur due to losses in pump, heat exchangers, pipelines, and the reinjection of thermal water. Exergy efficiencies of the two Systems are investigated for the system performance analysis and improvement and are determined to be 42.89% and 59.58%, respectively.

  • performance investigation of two geothermal district Heating Systems for building applications energy analysis
    Energy and Buildings, 2006
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    The energetic performance of Balcova geothermal district Heating system (BGDHS) and Salihli geothermal district Heating system (SGDHS) installed in Turkey is investigated for building applications in this study. The essential components (e.g., pumps, heat exchangers) of these geothermal district Heating Systems are also included in the modeling. The present model is employed for system analysis and energetic performance evaluation of the geothermal district Heating Systems. Energy flow diagrams are drawn to exhibit the input and output energies and losses to the surroundings by using the 2003 and 2004 Heating season actual data. In addition, energy efficiencies are studied for comparison purposes, and are found to be 39.36% for BGDHS and 59.31% for SGDHS, respectively.

Petr Ovchinnikov - One of the best experts on this subject based on the ideXlab platform.

  • utilization potential of low temperature hydronic space Heating Systems in russia
    Journal of building engineering, 2017
    Co-Authors: Petr Ovchinnikov, Anatolijs Borodiņecs, Renārs Millers
    Abstract:

    Abstract Due to drastically tightened building regulations in Europe in recent years, there has been gradual transfer to low-exergy Heating Systems in housing stock. Practices that take place in northern countries with similar to Russia weather conditions such as Denmark, Sweden and Finland showed apparent potential in applying such Systems in Russia. The latest changes and tendencies in building legislation system here although try to introduce low-exergy Systems in local market still confront it indirectly. The current study aims at evaluating practical application of low temperature hydronic space Heating Systems in residential buildings in Russia with a view to current recommendations on thermal performance of a building. Study object was placed in different locations of the country with corresponding to these locations envelope properties. Mathematical model was calculated using the energy simulation tool IDA Indoor Climate and Energy (ICE) 4.7. Parameters of comfort and energy performance were evaluated for every studied configuration. Results show partial applicability of low-temperature hydronic space Heating Systems with correspondence to current regulations on building's U-values. Possible measures of improvement were proposed in order to achieve good thermal comfort in every studied configuration.

  • utilization potential of low temperature hydronic space Heating Systems a comparative review
    Building and Environment, 2017
    Co-Authors: Petr Ovchinnikov, Anatolijs Borodiņecs, Ksenia Strelets
    Abstract:

    Abstract Recently, there has been a rising concern for hydronic space Heating Systems of various configurations for low temperature water Heating applications due to constantly tightening energy codes and regulations. Current tendencies in Russian legislation system aim to transfer local building sector for low-exergy Systems. The current work aims at reviewing the recent researches conducted on the low-temperature hydronic space Heating Systems and heat emitters with a view of evaluating their practical application in Russian building sector. The review is based on the comparison of various key performance data for systematic representation of studied concepts. It was stated that having a wide range of different approaches and performance criteria increases the difficulty of examining a specific system and comparing it with the others. Studies and practicies, analyzed in similar to Russia weather conditions, indicate distinct prospects of utilization of low-temperature hydronic Heating Systems. An optimum hydronic space-Heating configuration can be identified for the specific case but it is strongly dependent on initial boundary conditions.

Arif Hepbasli - One of the best experts on this subject based on the ideXlab platform.

  • A key review on performance improvement aspects of geothermal district Heating Systems and applications
    Renewable & Sustainable Energy Reviews, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    This paper deals with a comprehensive analysis and discussion of geothermal district Heating Systems and applications. In this regard, case studies are presented to study the thermodynamic aspects in terms of energy and exergy and performance improvement opportunities of three geothermal district Heating Systems, namely (i) Balcova geothermal district Heating system (BGDHS), (ii) Salihli geothermal district Heating system (SGDHS), and (iii) Gonen geothermal district Heating system (GGDHS) installed in Turkey. Energy and exergy modeling of geothermal district Heating Systems for system analysis and performance evaluation are given, while their performances are evaluated using energy and exergy analysis method. Energy and exergy specifications are presented in tables. In the analysis, the actual system operational data are utilized. In comparison of the local three district Heating Systems with each other, it is found that the SGDHS has highest energy efficiency, while the GGDHS has highest exergy efficiency.

  • Exergoeconomic analysis of geothermal district Heating Systems: A case study
    Applied Thermal Engineering, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    An exergoeconomic study of geothermal district Heating Systems through mass, energy, exergy and cost accounting analyses is reported and a case study is presented for the Salihli geothermal district Heating system (SGDHS) in Turkey to illustrate the present method. The relations between capital costs and thermodynamic losses for the system components are also investigated. Thermodynamic loss rate-to-capital cost ratios are used to show that, for the devices and the overall system, a systematic correlation appears to exist between capital cost and exergy loss (total or internal), but not between capital cost and energy loss or external exergy loss. Furthermore, a parametric study is conducted to determine how the ratio of thermodynamic loss rate to capital cost changes with reference temperature and to develop a correlation that can be used for practical analyses. The correlations may imply that devices in successful district Heating Systems such as the SGDHS are configured so as to achieve an overall optimal design, by appropriately balancing the thermodynamic (exergy-based) and economic (cost) characteristics of the overall Systems and their devices.

  • Exergy analysis of two geothermal district Heating Systems for building applications
    Energy Conversion and Management, 2007
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    Abstract This study evaluates the exergetic performance of two local Turkish geothermal district Heating Systems through exergy analysis. The exergy destructions in these geothermal district Heating Systems are quantified and illustrated using exergy flow diagrams for a reference temperature of 1 °C using the 2003 and 2004 actual seasonal Heating data. The results indicate that the exergy destructions in these Systems particularly occur due to losses in pump, heat exchangers, pipelines, and the reinjection of thermal water. Exergy efficiencies of the two Systems are investigated for the system performance analysis and improvement and are determined to be 42.89% and 59.58%, respectively.

  • performance investigation of two geothermal district Heating Systems for building applications energy analysis
    Energy and Buildings, 2006
    Co-Authors: Leyla Ozgener, Arif Hepbasli, Ibrahim Dincer
    Abstract:

    The energetic performance of Balcova geothermal district Heating system (BGDHS) and Salihli geothermal district Heating system (SGDHS) installed in Turkey is investigated for building applications in this study. The essential components (e.g., pumps, heat exchangers) of these geothermal district Heating Systems are also included in the modeling. The present model is employed for system analysis and energetic performance evaluation of the geothermal district Heating Systems. Energy flow diagrams are drawn to exhibit the input and output energies and losses to the surroundings by using the 2003 and 2004 Heating season actual data. In addition, energy efficiencies are studied for comparison purposes, and are found to be 39.36% for BGDHS and 59.31% for SGDHS, respectively.