The Experts below are selected from a list of 2262 Experts worldwide ranked by ideXlab platform

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

  • Use of solar assisted Geothermal Heat Pump and small wind turbine systems for Heating agricultural and residential buildings
    Energy, 2020
    Co-Authors: Onder Ozgener
    Abstract:

    The main objective of the present study is twofold: (i) to analyze thermal loads of the Geothermally and passively Heated solar greenhouses; and (ii) to investigate wind energy utilization in greenhouse Heating which is modeled as a hybrid solar assisted Geothermal Heat Pump and a small wind turbine system which is separately installed in the Solar Energy Institute of Ege University, Izmir, Turkey. The study shows 3.13% of the total yearly electricity energy consumption of the modeled system (3568kWh) or 12.53% of the total yearly electricity energy consumptions of secondary water Pumping, brine Pumping, and fan coil (892kWh) can be met by using small wind turbine system (SWTS) theoretically. According to this result, modeled passive solar pre Heating technique and combined with Geothermal Heat Pump system (GHPS) and SWTS can be economically preferable to the conventional space Heating/cooling systems used in agricultural and residential building Heating applications if these buildings are installed in a region, which has a good wind resource.

  • Modeling of driveway as a solar collector for improving efficiency of solar assisted Geothermal Heat Pump system: A case study
    Renewable and Sustainable Energy Reviews, 2015
    Co-Authors: Onder Ozgener, Leyla Ozgener
    Abstract:

    It is well known that rooftop solar thermal panels increase both power rates of circulation Pumps and initial investment cost of solar assisted ground source (Geothermal) systems. To avoid both of them it means that the unnecessary energy consumption rates of circulation Pump(s) and their initial capital cost, rather than installing rooftop solar thermal panels, driveways can be used as solar collectors for improving efficiency of Geothermal Heat Pump systems (GSHP) and declining initial capital cost of SAGSHPs. Mainly this idea was first put in the middle by Jefferson W. Tester. In this paper, we will examine modeling of driveway as solar thermal panel to enhance efficiency of solar assisted Geothermal Heat Pump system (SAGSHP) depends on its different operating types; yet we will give only a case that is investigated theoretically for solar assisted Geothermal Heat Pump systems.

  • Use of solar assisted Geothermal Heat Pump and small wind turbine systems for Heating agricultural and residential buildings
    Energy, 2010
    Co-Authors: Onder Ozgener
    Abstract:

    The main objective of the present study is twofold: (i) to analyze thermal loads of the Geothermally and passively Heated solar greenhouses; and (ii) to investigate wind energy utilization in greenhouse Heating which is modeled as a hybrid solar assisted Geothermal Heat Pump and a small wind turbine system which is separately installed in the Solar Energy Institute of Ege University, Izmir, Turkey. The study shows 3.13% of the total yearly electricity energy consumption of the modeled system (3568 kWh) or 12.53% of the total yearly electricity energy consumptions of secondary water Pumping, brine Pumping, and fan coil (892 kWh) can be met by using small wind turbine system (SWTS) theoretically. According to this result, modeled passive solar pre Heating technique and combined with Geothermal Heat Pump system (GHPS) and SWTS can be economically preferable to the conventional space Heating/cooling systems used in agricultural and residential building Heating applications if these buildings are installed in a region, which has a good wind resource. (C) 2009 Elsevier Ltd. All rights reserved.

  • a parametric study on the exergoeconomic assessment of a vertical ground coupled Geothermal Heat Pump system
    Building and Environment, 2007
    Co-Authors: Onder Ozgener, Arif Hepbasli, Leyla Ozgener
    Abstract:

    Abstract An exergoeconomic model of a vertical ground-source Heat Pump residential Heating system presented in this study uses exergy and cost energy mass (EXCEM) methods. The data obtained from a ground-source Heat Pump (GSHP) residential Heating system installed at the Solar Energy Institute, Ege University, Turkey, are utilized for calculations at different reference temperature values in the range 0–25 °C. The performance of the Geothermal Heat Pump residential Heating system is evaluated to indicate how exergoecomic parameter values change with system. We also undertake a parametric study to investigate how varying reference temperatures will affect the exergoeconomic analysis of the GSHP system. A correlation between the ratio of thermodynamic loss rate to capital cost and reference state temperature is developed.

  • An economical analysis on a solar greenhouse integrated solar assisted Geothermal Heat Pump system
    Journal of Energy Resources Technology, Transactions of the ASME, 2006
    Co-Authors: Onder Ozgener, Arif Hepbasli
    Abstract:

    The main objective in doing the present study is twofold, namely (i) to review briefly the utilization of Geothermally Heated greenhouses and Geothermal Heat Pumps in Turkey, since the system studied utilizes both renewable energy resources and (ii) to present the Analytical Hierarchy Process (AHP) as a potential decision making method for use in a greenhouse integrated solar assisted Geothermal Heat Pump system (GISAGHPS), which was installed in the Solar Energy Institute of Ege University, Izmir, Turkey. This investigation may also be regarded as the one of the limited studies on the application of the AHP method to GISAGHPs, as no studies on the GISAGHPS have appeared in the literature. In this context, an economic analysis is performed based on the life cycle costing technique first. The results are then evaluated by applying the AHP method to a study, which is a comparative study on the GISAGHPS and split system. The results indicated that the GISAGHPS is economically preferable to the conventional split Heating/cooling system under Turkey's conditions. Copyright © 2006 by ASME.

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

  • Modeling of driveway as a solar collector for improving efficiency of solar assisted Geothermal Heat Pump system: A case study
    Renewable and Sustainable Energy Reviews, 2015
    Co-Authors: Onder Ozgener, Leyla Ozgener
    Abstract:

    It is well known that rooftop solar thermal panels increase both power rates of circulation Pumps and initial investment cost of solar assisted ground source (Geothermal) systems. To avoid both of them it means that the unnecessary energy consumption rates of circulation Pump(s) and their initial capital cost, rather than installing rooftop solar thermal panels, driveways can be used as solar collectors for improving efficiency of Geothermal Heat Pump systems (GSHP) and declining initial capital cost of SAGSHPs. Mainly this idea was first put in the middle by Jefferson W. Tester. In this paper, we will examine modeling of driveway as solar thermal panel to enhance efficiency of solar assisted Geothermal Heat Pump system (SAGSHP) depends on its different operating types; yet we will give only a case that is investigated theoretically for solar assisted Geothermal Heat Pump systems.

  • a parametric study on the exergoeconomic assessment of a vertical ground coupled Geothermal Heat Pump system
    Building and Environment, 2007
    Co-Authors: Onder Ozgener, Arif Hepbasli, Leyla Ozgener
    Abstract:

    Abstract An exergoeconomic model of a vertical ground-source Heat Pump residential Heating system presented in this study uses exergy and cost energy mass (EXCEM) methods. The data obtained from a ground-source Heat Pump (GSHP) residential Heating system installed at the Solar Energy Institute, Ege University, Turkey, are utilized for calculations at different reference temperature values in the range 0–25 °C. The performance of the Geothermal Heat Pump residential Heating system is evaluated to indicate how exergoecomic parameter values change with system. We also undertake a parametric study to investigate how varying reference temperatures will affect the exergoeconomic analysis of the GSHP system. A correlation between the ratio of thermodynamic loss rate to capital cost and reference state temperature is developed.

Marc A. Rosen - One of the best experts on this subject based on the ideXlab platform.

  • Geothermal Heat Pump systems: Status review and comparison with other Heating options
    Applied Energy, 2013
    Co-Authors: Stuart J. Self, B.v. Reddy, Marc A. Rosen
    Abstract:

    Heating is a major requirement in many regions, and growing energy demands and pollutant emissions have allowed unconventional Heating technologies to be considered, including Geothermal. Geothermal Heat Pumps are reviewed, including Heat Pump technology, earth connections, current world status and recent developments. Geothermal Heat Pump technology and conventional Heating systems are compared in terms of costs, CO2 emissions and other parameters. Geothermal Heat Pump use is economically advantageous when the price of electricity is low. Alternatively Geothermal Heat Pump units have the lowest emissions depending when electricity is produced from a low emitting source. © 2012 Elsevier Ltd.

  • Geothermal Heat Pump systems status review and comparison with other Heating options
    Applied Energy, 2013
    Co-Authors: Stuart J. Self, B.v. Reddy, Marc A. Rosen
    Abstract:

    Heating is a major requirement in many regions, and growing energy demands and pollutant emissions have allowed unconventional Heating technologies to be considered, including Geothermal. Geothermal Heat Pumps are reviewed, including Heat Pump technology, earth connections, current world status and recent developments. Geothermal Heat Pump technology and conventional Heating systems are compared in terms of costs, CO2 emissions and other parameters. Geothermal Heat Pump use is economically advantageous when the price of electricity is low. Alternatively Geothermal Heat Pump units have the lowest emissions depending when electricity is produced from a low emitting source.

  • thermodynamic analysis of a hybrid Geothermal Heat Pump system
    Geothermics, 2011
    Co-Authors: Luthfi I. Lubis, Mehmet Kanoglu, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Abstract A thermodynamic analysis of a hybrid Geothermal Heat Pump system is carried out. Mass, energy, and exergy balances are applied to the system, which has a cooling tower as a Heat rejection unit, and system performance is evaluated in terms of coefficient of performance and exergy efficiency. The Heating coefficient of performance for the overall system is found to be 5.34, while the corresponding exergy efficiency is 63.4%. The effect of ambient temperature on the exergy destruction and exergy efficiency is investigated for the system components. The results indicate that the performance of hybrid Geothermal Heat Pump systems is superior to air-source Heat Pumps.

  • Thermodynamic analysis of a hybrid Geothermal Heat Pump system
    Geothermics, 2011
    Co-Authors: Luthfi I. Lubis, Mehmet Kanoglu, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A thermodynamic analysis of a hybrid Geothermal Heat Pump system is carried out. Mass, energy, and exergy balances are applied to the system, which has a cooling tower as a Heat rejection unit, and system performance is evaluated in terms of coefficient of performance and exergy efficiency. The Heating coefficient of performance for the overall system is found to be 5.34, while the corresponding exergy efficiency is 63.4%. The effect of ambient temperature on the exergy destruction and exergy efficiency is investigated for the system components. The results indicate that the performance of hybrid Geothermal Heat Pump systems is superior to air-source Heat Pumps. © 2011 Elsevier Ltd.

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

  • a parametric study on the exergoeconomic assessment of a vertical ground coupled Geothermal Heat Pump system
    Building and Environment, 2007
    Co-Authors: Onder Ozgener, Arif Hepbasli, Leyla Ozgener
    Abstract:

    Abstract An exergoeconomic model of a vertical ground-source Heat Pump residential Heating system presented in this study uses exergy and cost energy mass (EXCEM) methods. The data obtained from a ground-source Heat Pump (GSHP) residential Heating system installed at the Solar Energy Institute, Ege University, Turkey, are utilized for calculations at different reference temperature values in the range 0–25 °C. The performance of the Geothermal Heat Pump residential Heating system is evaluated to indicate how exergoecomic parameter values change with system. We also undertake a parametric study to investigate how varying reference temperatures will affect the exergoeconomic analysis of the GSHP system. A correlation between the ratio of thermodynamic loss rate to capital cost and reference state temperature is developed.

  • An economical analysis on a solar greenhouse integrated solar assisted Geothermal Heat Pump system
    Journal of Energy Resources Technology, Transactions of the ASME, 2006
    Co-Authors: Onder Ozgener, Arif Hepbasli
    Abstract:

    The main objective in doing the present study is twofold, namely (i) to review briefly the utilization of Geothermally Heated greenhouses and Geothermal Heat Pumps in Turkey, since the system studied utilizes both renewable energy resources and (ii) to present the Analytical Hierarchy Process (AHP) as a potential decision making method for use in a greenhouse integrated solar assisted Geothermal Heat Pump system (GISAGHPS), which was installed in the Solar Energy Institute of Ege University, Izmir, Turkey. This investigation may also be regarded as the one of the limited studies on the application of the AHP method to GISAGHPs, as no studies on the GISAGHPS have appeared in the literature. In this context, an economic analysis is performed based on the life cycle costing technique first. The results are then evaluated by applying the AHP method to a study, which is a comparative study on the GISAGHPS and split system. The results indicated that the GISAGHPS is economically preferable to the conventional split Heating/cooling system under Turkey's conditions. Copyright © 2006 by ASME.

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

  • experimental evaluation of a non azeotropic working fluid for Geothermal Heat Pump system
    Energy Conversion and Management, 2004
    Co-Authors: Li Zhao
    Abstract:

    Abstract Geothermal energy resources are found in many countries. A reasonable and efficient utilization of these resources has been a worldwide concern. The application of Geothermal Heat Pump systems (GHPS) can help increase the efficiency of using Geothermal energy and reduce the thermal pollution to the earth surface. However, this is only possible with a proper working fluid. In this paper, a non-azeotropic working fluid (R290/R600a/R123) is presented for a GHPS where Geothermal water at 40–45 °C and Heating network water at 70–80 °C serve as the low and high temperature Heat sources. Experimental results show that the coefficient of performance (COP) of a GHPS using the working fluid is above 3.5 with the condensation temperature above 80 °C and the condensation pressure below 18 bar, while the temperature of the Geothermal water is reduced from 40–46 °C to 31–36 °C.

  • simulation of a Geothermal Heat Pump with non azeotropic mixture
    Applied Thermal Engineering, 2003
    Co-Authors: P C Zhao, Guoliang Ding, C L Zhang, Li Zhao
    Abstract:

    The paper sets up a simulation of a Geothermal Heat Pump with a non-azeotropic mixture. The model is modified and verified with experimental data. The results of the simulation show that the systematic model can predict the performance within ±12% of the experimental data. As a result, some improvements can be provided on the basis of the simulation platform.

  • theoretical and basic experimental analysis on load adjustment of Geothermal Heat Pump systems
    Energy Conversion and Management, 2003
    Co-Authors: Linchuan Zhao, Q. Zhang, Li Zhao, Guoliang Ding
    Abstract:

    In order to match the output capacity of a Geothermal Heat Pump system (GHPS) with the actual load requirement, research has been conducted in searching for suitable adjusting methods for the GHPS and on the subsequent effects on the working parameters of the GHPS. Firstly, several methods are compared, and it is found that the method of adjusting the compressor's rotation speed using a transducer is better than the others. Secondly, this method is experimented on a small scale GHPS at frequencies ranging from 30 to 55 Hz. The analysis of the experimental data reveals the relationships between the compressor frequency and other important parameters, such as coefficient of performance, Heat capacity, cool capacity and compressor power input. The conclusions in the paper can serve as some guidance to the load adjustment of GHPS.

  • Influence of two systematic parameters on the Geothermal Heat Pump system operation
    Renewable Energy, 2002
    Co-Authors: Li Zhao, Tingbin Zhang, Q. Zhang, G.l. Ding
    Abstract:

    In order to match the output capacity of a Geothermal Heat Pump system (GHPS) with the actual load requirement, research has been carried out in finding the influence of two systematic parameters, the water flow rate inside the condenser and the compressor input frequency on the GHPS operation. Experiments are done on a small-scale GHPS at the water flow rate ranging from 0.054 kg/s to 0.174 kg/s and the frequency from 30 Hz to 55 Hz. The analysis of the experimental data reveals the relationships among the compressor frequency, the water flow rate and other important parameters such as coefficient of performance (COP), Heat capacity and compressor power input. The conclusions in the paper can serve as some guidance to the load adjustment of GHPS.