Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study

Ally, Moonis R.; Sharma, Vishaldeep; Abdelaziz, Omar

doi:10.1016/j.ijrefrig.2017.02.011

Title: Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study

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Abstract

The choice of driving a heat pump with an electrically$$-$$or a thermally-driven engine is a vexing question complicated by the carbon footprint and environmental impact of using electricity versus natural gas (or waste heat) as the main driver for the respective engines. The amount of useful work generated by these two distinct engines is the focal point of this paper, which addresses a key question: which engine presents a better choice for a given heat pumping application within the constraints of energy and environmental stewardship? Extensive use of energy, exergy, and availability analysis is necessary to quantify the useful work and to examine the issue holistically for both types of engines. The methodology explains why the output of work from these two distinct engines to satisfy a given load is vastly different, a direct consequence of their inherent Irreversibility. Thermodynamic consistency is guaranteed by satisfaction of the First and Second Laws applied to closed systems and their subsystems. The general conclusion is that thermally-driven engines are not industrious converters of heat to mechanical work.

Authors:

^[1]; Sharma, Vishaldeep ^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Sciences Division

Publication Date:: Tue Feb 21 00:00:00 EST 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1349607

Alternate Identifier(s):: OSTI ID: 1414303

Grant/Contract Number:: AC05-00OR22725; FWP/IAN CEBT002

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of Refrigeration

Additional Journal Information:: Journal Volume: 76; Journal Issue: C; Journal ID: ISSN 0140-7007

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; heat pumps; availability; sorption; absorption; thermodynamics; Ground-source; Sustainability

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                    Ally, Moonis R., Sharma, Vishaldeep, and Abdelaziz, Omar. Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study.  United States: N. p., 2017. 
Web.  doi:10.1016/j.ijrefrig.2017.02.011.

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                    Ally, Moonis R., Sharma, Vishaldeep, & Abdelaziz, Omar. Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study.  United States.  https://doi.org/10.1016/j.ijrefrig.2017.02.011

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                    Ally, Moonis R., Sharma, Vishaldeep, and Abdelaziz, Omar. Tue .  
"Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study".  United States.  https://doi.org/10.1016/j.ijrefrig.2017.02.011.  https://www.osti.gov/servlets/purl/1349607.

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@article{osti_1349607,

  title        = {Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study},

  author       = {Ally, Moonis R. and Sharma, Vishaldeep and Abdelaziz, Omar},

  abstractNote = {The choice of driving a heat pump with an electrically$-$or a thermally-driven engine is a vexing question complicated by the carbon footprint and environmental impact of using electricity versus natural gas (or waste heat) as the main driver for the respective engines. The amount of useful work generated by these two distinct engines is the focal point of this paper, which addresses a key question: which engine presents a better choice for a given heat pumping application within the constraints of energy and environmental stewardship? Extensive use of energy, exergy, and availability analysis is necessary to quantify the useful work and to examine the issue holistically for both types of engines. The methodology explains why the output of work from these two distinct engines to satisfy a given load is vastly different, a direct consequence of their inherent Irreversibility. Thermodynamic consistency is guaranteed by satisfaction of the First and Second Laws applied to closed systems and their subsystems. The general conclusion is that thermally-driven engines are not industrious converters of heat to mechanical work.},

  doi          = {10.1016/j.ijrefrig.2017.02.011},

  journal      = {International Journal of Refrigeration},

  number       = C,

  volume       = 76,

  place        = {United States},

  year         = {Tue Feb 21 00:00:00 EST 2017},

  month        = {Tue Feb 21 00:00:00 EST 2017}

}

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