Publication: Simultaneous Optimization of Working Fluid and Process for Organic Rankine Cycles (ORCs) using PC-SAFT
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Simultaneous Optimization of Working Fluid and Process for Organic Rankine Cycles (ORCs) using PC-SAFT

- Article in a journal -
 

Area
Process Engineering

Author(s)
M. Lampe , M. Stavrou , H. M. Bücker , J. Gross , A. Bardow

Published in
Industrial & Engineering Chemistry Research

Year
2014

Abstract
Organic Rankine Cycles (ORCs) generate power from low-temperature heat. To make best use of the diverse low-temperature heat sources, the cycle is tailored to each application. The objective is to maximize process performance by optimizing both, process parameters and the working fluid. Today, process optimization and working fluid selection are addressed separately in a two-step approach: working fluids are selected using heuristic knowledge; subsequently, the process is optimized. Such an approach can lead to suboptimal solutions, since the optimal fluid might be excluded by the heuristics. We therefore present a framework for the holistic design of ORCs enabling the simultaneous optimization of process and working fluid based on process performance. The simultaneous optimization is achieved by exploiting the rich molecular picture underlying the PC-SAFT equation of state in a continuous-molecular targeting approach (CoMT-CAMD). To allow for the prediction of caloric properties, a quantitative structure-property relationship (QSPR) for the ideal gas heat capacity is proposed that relies on pure component parameters of PC-SAFT. The framework is used for the optimization of a geothermal ORC in a case study. A sound holistic design of process and working fluid is achieved.

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BibTeX
@ARTICLE{
         Lampe2014SOo,
       author = "M. Lampe and M. Stavrou and H. M. B{\"u}cker and J. Gross and A. Bardow",
       title = "Simultaneous Optimization of Working Fluid and Process for {O}rganic {R}ankine
         {C}ycles ({ORC}s) using {PC-SAFT}",
       journal = "Industrial \& Engineering Chemistry Research",
       pages = "8821--8830",
       doi = "10.1021/ie5006542",
       abstract = "Organic Rankine Cycles (ORCs) generate power from low-temperature heat. To make
         best use of the diverse low-temperature heat sources, the cycle is tailored to each application. The
         objective is to maximize process performance by optimizing both, process parameters and the working
         fluid. Today, process optimization and working fluid selection are addressed separately in a
         two-step approach: working fluids are selected using heuristic knowledge; subsequently, the process
         is optimized. Such an approach can lead to suboptimal solutions, since the optimal fluid might be
         excluded by the heuristics. We therefore present a framework for the holistic design of ORCs
         enabling the simultaneous optimization of process and working fluid based on process performance.
         The simultaneous optimization is achieved by exploiting the rich molecular picture underlying the
         PC-SAFT equation of state in a continuous-molecular targeting approach (CoMT-CAMD). To allow for the
         prediction of caloric properties, a quantitative structure-property relationship (QSPR) for the
         ideal gas heat capacity is proposed that relies on pure component parameters of PC-SAFT. The
         framework is used for the optimization of a geothermal ORC in a case study. A sound holistic design
         of process and working fluid is achieved.",
       year = "2014",
       volume = "53",
       number = "21",
       ad_area = "Process Engineering",
       ad_tools = "ADIFOR"
}


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