The Experts below are selected from a list of 4449 Experts worldwide ranked by ideXlab platform

Mikhail Sorin - One of the best experts on this subject based on the ideXlab platform.

  • analysis of photovoltaic pv and photovoltaic thermal pv t systems using the Exergy Method
    Energy and Buildings, 2013
    Co-Authors: E. Saloux, Alberto Teyssedou, Mikhail Sorin
    Abstract:

    Abstract In this paper, analyses of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems, based on the Exergy Method are presented. To this aim, explicit electrical and thermal models are developed and used to characterize each system. Furthermore, energy and Exergy balances are combined in order to identify the different sources of Exergy losses involved in both thermal and electrical energy fluxes. Electrical current and voltage reduction factors are defined and used to express the Exergy as well as its destruction in PV/T system, while two thermodynamic diagrams are proposed to visualize these losses. The first one illustrates exergies expended, produced and destroyed during the conversion of solar radiation. The second one allows individual effects of both electrical potential and current losses to be explicitly revealed. The proposed Methodology is applied to study a PV/T system operating under different environmental conditions, i.e., solar intensity and ambient temperature, where irreversibility in addition to energy and Exergy efficiencies are calculated and analyzed.

  • Analysis of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems using the Exergy Method
    Energy and Buildings, 2013
    Co-Authors: E. Saloux, Alberto Teyssedou, Mikhail Sorin
    Abstract:

    Abstract In this paper, analyses of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems, based on the Exergy Method are presented. To this aim, explicit electrical and thermal models are developed and used to characterize each system. Furthermore, energy and Exergy balances are combined in order to identify the different sources of Exergy losses involved in both thermal and electrical energy fluxes. Electrical current and voltage reduction factors are defined and used to express the Exergy as well as its destruction in PV/T system, while two thermodynamic diagrams are proposed to visualize these losses. The first one illustrates exergies expended, produced and destroyed during the conversion of solar radiation. The second one allows individual effects of both electrical potential and current losses to be explicitly revealed. The proposed Methodology is applied to study a PV/T system operating under different environmental conditions, i.e., solar intensity and ambient temperature, where irreversibility in addition to energy and Exergy efficiencies are calculated and analyzed.

Bilal Zemher - One of the best experts on this subject based on the ideXlab platform.

  • effect of saturation temperature on the performance of a vapour compression refrigeration cycle working on different refrigerants using Exergy Method
    International Journal of Energy Research, 2006
    Co-Authors: Mehmet Kopac, Bilal Zemher
    Abstract:

    In this study, the behaviour of a vapour-compression refrigeration cycle, for different refrigerants such as NH3, R-12, R-22 and HFC-134a was investigated using the Exergy Method. The cooling load of the plant and the saturation-temperature of the cold chamber were held constant, whereas the saturation-temperatures of the evaporator and the condenser were varied from 303 to 313 K and 258 to 248 K, respectively. The irreversibility rates (or Exergy destruction rates) of sub-regions for the whole cycle, using energy and Exergy analysis, were determined for each refrigerant. The effects of changes in the saturation-temperature in the condenser and evaporator on the irreversibility rate of the cycle were obtained for each refrigerant. The relations between the total irreversibility rate of the plant and the irreversibility rate of the condenser and the evaporator were determined for different values of saturation temperatures of the condenser and the evaporator. The COP of the cycle and the rational efficiency were determined for each of the refrigerants and compared with each other. Among the refrigerants used, R-12 was found to be the most economical refrigerant as compared with the others. Copyright © 2005 John Wiley & Sons, Ltd.

Mahmoud Reza Pishvaie - One of the best experts on this subject based on the ideXlab platform.

  • Simulation and Exergy-Method analysis of an industrial refrigeration cycle used in NGL recovery units
    International Journal of Energy Research, 2006
    Co-Authors: Mehdi Mehrpooya, Azad Jarrahian, Mahmoud Reza Pishvaie
    Abstract:

    The behaviour of an industrial refrigeration cycle with refrigerant propane has been investigated by the Exergy Method. An natural gas liquid recovery unit with its refrigeration cycle has been simulated to prepare the Exergy analysis. Using a typical actual work input value; the exergetic efficiency of the refrigeration cycle is determined to be 26.51% indicating a great potential for improvements. The obtained simulation results reveal that the exergetic efficiencies of the air cooler(s) and chilling sections get the lowest rank among the other compartments of refrigeration cycle. Refrigeration calculations have been carried out through the analysis of T–S and P–H diagrams where coefficient of performance (COP) was obtained as 1.8. The novelty of this article include the suggestions for increasing efficiencies, along with the discussion about the reasons for deviation from ideal cycles and also the effect and sensitivity analysis of pressure drops on the coefficient of performance of the cycle. Copyright © 2006 John Wiley & Sons, Ltd.

E. Saloux - One of the best experts on this subject based on the ideXlab platform.

  • analysis of photovoltaic pv and photovoltaic thermal pv t systems using the Exergy Method
    Energy and Buildings, 2013
    Co-Authors: E. Saloux, Alberto Teyssedou, Mikhail Sorin
    Abstract:

    Abstract In this paper, analyses of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems, based on the Exergy Method are presented. To this aim, explicit electrical and thermal models are developed and used to characterize each system. Furthermore, energy and Exergy balances are combined in order to identify the different sources of Exergy losses involved in both thermal and electrical energy fluxes. Electrical current and voltage reduction factors are defined and used to express the Exergy as well as its destruction in PV/T system, while two thermodynamic diagrams are proposed to visualize these losses. The first one illustrates exergies expended, produced and destroyed during the conversion of solar radiation. The second one allows individual effects of both electrical potential and current losses to be explicitly revealed. The proposed Methodology is applied to study a PV/T system operating under different environmental conditions, i.e., solar intensity and ambient temperature, where irreversibility in addition to energy and Exergy efficiencies are calculated and analyzed.

  • Analysis of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems using the Exergy Method
    Energy and Buildings, 2013
    Co-Authors: E. Saloux, Alberto Teyssedou, Mikhail Sorin
    Abstract:

    Abstract In this paper, analyses of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems, based on the Exergy Method are presented. To this aim, explicit electrical and thermal models are developed and used to characterize each system. Furthermore, energy and Exergy balances are combined in order to identify the different sources of Exergy losses involved in both thermal and electrical energy fluxes. Electrical current and voltage reduction factors are defined and used to express the Exergy as well as its destruction in PV/T system, while two thermodynamic diagrams are proposed to visualize these losses. The first one illustrates exergies expended, produced and destroyed during the conversion of solar radiation. The second one allows individual effects of both electrical potential and current losses to be explicitly revealed. The proposed Methodology is applied to study a PV/T system operating under different environmental conditions, i.e., solar intensity and ambient temperature, where irreversibility in addition to energy and Exergy efficiencies are calculated and analyzed.

Mehmet Kopac - One of the best experts on this subject based on the ideXlab platform.

  • effect of saturation temperature on the performance of a vapour compression refrigeration cycle working on different refrigerants using Exergy Method
    International Journal of Energy Research, 2006
    Co-Authors: Mehmet Kopac, Bilal Zemher
    Abstract:

    In this study, the behaviour of a vapour-compression refrigeration cycle, for different refrigerants such as NH3, R-12, R-22 and HFC-134a was investigated using the Exergy Method. The cooling load of the plant and the saturation-temperature of the cold chamber were held constant, whereas the saturation-temperatures of the evaporator and the condenser were varied from 303 to 313 K and 258 to 248 K, respectively. The irreversibility rates (or Exergy destruction rates) of sub-regions for the whole cycle, using energy and Exergy analysis, were determined for each refrigerant. The effects of changes in the saturation-temperature in the condenser and evaporator on the irreversibility rate of the cycle were obtained for each refrigerant. The relations between the total irreversibility rate of the plant and the irreversibility rate of the condenser and the evaporator were determined for different values of saturation temperatures of the condenser and the evaporator. The COP of the cycle and the rational efficiency were determined for each of the refrigerants and compared with each other. Among the refrigerants used, R-12 was found to be the most economical refrigerant as compared with the others. Copyright © 2005 John Wiley & Sons, Ltd.