The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform

Viorel Badescu - One of the best experts on this subject based on the ideXlab platform.

  • Maximum Reversible Work extraction from a blackbody radiation reservoir a way to closing the old controversy
    EPL, 2015
    Co-Authors: Viorel Badescu
    Abstract:

    The old controversy concerning the correctness of Petela-Landsberg-Press and Carnot formulas for the efficiency of Reversible Work extraction from a blackbody radiation reservoir is solved. Both formulas are correct. They are particular cases of a more general formula involving the geometric factor of the radiation reservoir. The Maximum Work rate density obtained from a reservoir associated with Carnot efficiency may be higher, or lower, than that obtained from a radiation reservoir of similar temperature associated with lower Reversible conversion efficiency, depending on the ambient temperature.

Harumi Yokokawa - One of the best experts on this subject based on the ideXlab platform.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    It is important to understand the Maximum possible thermal efficiency a device is capable of obtaining and then what of this it actually achieves. In this paper it is shown that the thermal efficiency is a product of the voltage efficiency and the Maximum possible thermal efficiency. One can mathematically demonstrate that for any elemental direct anodic oxidation reaction for a simple hybrid system, any fuel cell, and any operating temperature, any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This is useful in defining an intrinsic fuel cell exergetic efficiency. An equation for thermal efficiency as a product of exergetic efficiency and Maximum possible thermal efficiency is developed and presented for loosely integrated fuel cell turbine hybrids. From these simple studies alone one would conclude that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells Using MALT2
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    There are at least four basic fuel cell thermodynamic features: Maximum intrinsic thermal efficiency (electrical efficiency), Reversible potential, and two new ones-intrinsic cooling requirement and intrinsic exergetic efficiency. A basic electrochemical thermodynamic analysis of fuel cells using MALT reveals that it is probably for thermodynamic reasons that cooling strategies other than excess oxidant, such as water cooling, have generally been adopted for lower temperature fuel cells such as polymer electrolyte fuel cell (PEFC) and phosphoric acid fuel cell (PAFC). One can mathematically demonstrate that for a simple hybrid system, any fuel cell, any operating temperature, and any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This study gives information of new opportunity fuels having increasing importance is all future energy scenarios. The results of this analysis show that ammonia and direct methanol give greater Maximum intrinsic thermal efficiency than hydrogen oxidation. From these simple studies alone, one would conclude that the great payoff in terms of theoretical efficiency potential for research is direct carbon fuel cell (DCFT), PEFC, and direct oxidation of methane, intermediate temperature solid oxide fuel cell (SOFC), and simple fuel cell turbine hybrids.

Mark C. Williams - One of the best experts on this subject based on the ideXlab platform.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    It is important to understand the Maximum possible thermal efficiency a device is capable of obtaining and then what of this it actually achieves. In this paper it is shown that the thermal efficiency is a product of the voltage efficiency and the Maximum possible thermal efficiency. One can mathematically demonstrate that for any elemental direct anodic oxidation reaction for a simple hybrid system, any fuel cell, and any operating temperature, any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This is useful in defining an intrinsic fuel cell exergetic efficiency. An equation for thermal efficiency as a product of exergetic efficiency and Maximum possible thermal efficiency is developed and presented for loosely integrated fuel cell turbine hybrids. From these simple studies alone one would conclude that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells Using MALT2
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    There are at least four basic fuel cell thermodynamic features: Maximum intrinsic thermal efficiency (electrical efficiency), Reversible potential, and two new ones-intrinsic cooling requirement and intrinsic exergetic efficiency. A basic electrochemical thermodynamic analysis of fuel cells using MALT reveals that it is probably for thermodynamic reasons that cooling strategies other than excess oxidant, such as water cooling, have generally been adopted for lower temperature fuel cells such as polymer electrolyte fuel cell (PEFC) and phosphoric acid fuel cell (PAFC). One can mathematically demonstrate that for a simple hybrid system, any fuel cell, any operating temperature, and any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This study gives information of new opportunity fuels having increasing importance is all future energy scenarios. The results of this analysis show that ammonia and direct methanol give greater Maximum intrinsic thermal efficiency than hydrogen oxidation. From these simple studies alone, one would conclude that the great payoff in terms of theoretical efficiency potential for research is direct carbon fuel cell (DCFT), PEFC, and direct oxidation of methane, intermediate temperature solid oxide fuel cell (SOFC), and simple fuel cell turbine hybrids.

Teruhisa Horita - One of the best experts on this subject based on the ideXlab platform.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    It is important to understand the Maximum possible thermal efficiency a device is capable of obtaining and then what of this it actually achieves. In this paper it is shown that the thermal efficiency is a product of the voltage efficiency and the Maximum possible thermal efficiency. One can mathematically demonstrate that for any elemental direct anodic oxidation reaction for a simple hybrid system, any fuel cell, and any operating temperature, any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This is useful in defining an intrinsic fuel cell exergetic efficiency. An equation for thermal efficiency as a product of exergetic efficiency and Maximum possible thermal efficiency is developed and presented for loosely integrated fuel cell turbine hybrids. From these simple studies alone one would conclude that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells Using MALT2
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    There are at least four basic fuel cell thermodynamic features: Maximum intrinsic thermal efficiency (electrical efficiency), Reversible potential, and two new ones-intrinsic cooling requirement and intrinsic exergetic efficiency. A basic electrochemical thermodynamic analysis of fuel cells using MALT reveals that it is probably for thermodynamic reasons that cooling strategies other than excess oxidant, such as water cooling, have generally been adopted for lower temperature fuel cells such as polymer electrolyte fuel cell (PEFC) and phosphoric acid fuel cell (PAFC). One can mathematically demonstrate that for a simple hybrid system, any fuel cell, any operating temperature, and any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This study gives information of new opportunity fuels having increasing importance is all future energy scenarios. The results of this analysis show that ammonia and direct methanol give greater Maximum intrinsic thermal efficiency than hydrogen oxidation. From these simple studies alone, one would conclude that the great payoff in terms of theoretical efficiency potential for research is direct carbon fuel cell (DCFT), PEFC, and direct oxidation of methane, intermediate temperature solid oxide fuel cell (SOFC), and simple fuel cell turbine hybrids.

K. Yamagi - One of the best experts on this subject based on the ideXlab platform.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    It is important to understand the Maximum possible thermal efficiency a device is capable of obtaining and then what of this it actually achieves. In this paper it is shown that the thermal efficiency is a product of the voltage efficiency and the Maximum possible thermal efficiency. One can mathematically demonstrate that for any elemental direct anodic oxidation reaction for a simple hybrid system, any fuel cell, and any operating temperature, any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This is useful in defining an intrinsic fuel cell exergetic efficiency. An equation for thermal efficiency as a product of exergetic efficiency and Maximum possible thermal efficiency is developed and presented for loosely integrated fuel cell turbine hybrids. From these simple studies alone one would conclude that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids.

  • Basic Electrochemical Thermodynamic Studies of Fuel Cells Using MALT2
    Journal of Fuel Cell Science and Technology, 2009
    Co-Authors: Mark C. Williams, Teruhisa Horita, K. Yamagi, Natsuko Sakai, Harumi Yokokawa
    Abstract:

    There are at least four basic fuel cell thermodynamic features: Maximum intrinsic thermal efficiency (electrical efficiency), Reversible potential, and two new ones-intrinsic cooling requirement and intrinsic exergetic efficiency. A basic electrochemical thermodynamic analysis of fuel cells using MALT reveals that it is probably for thermodynamic reasons that cooling strategies other than excess oxidant, such as water cooling, have generally been adopted for lower temperature fuel cells such as polymer electrolyte fuel cell (PEFC) and phosphoric acid fuel cell (PAFC). One can mathematically demonstrate that for a simple hybrid system, any fuel cell, any operating temperature, and any pressure, the Maximum Reversible Work is equal to the free energy of reaction at the standard state. This study gives information of new opportunity fuels having increasing importance is all future energy scenarios. The results of this analysis show that ammonia and direct methanol give greater Maximum intrinsic thermal efficiency than hydrogen oxidation. From these simple studies alone, one would conclude that the great payoff in terms of theoretical efficiency potential for research is direct carbon fuel cell (DCFT), PEFC, and direct oxidation of methane, intermediate temperature solid oxide fuel cell (SOFC), and simple fuel cell turbine hybrids.