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Comparative Study of Sub-Critical and Supercritical ORC Applications for Exhaust Waste Heat Recovery

Buket Boz; Alvaro Diez


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        <foaf:name>Buket Boz</foaf:name>
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        <foaf:name>Alvaro Diez</foaf:name>
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    <dct:title>Comparative Study of Sub-Critical and Supercritical ORC Applications for Exhaust Waste Heat Recovery</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2018</dct:issued>
    <dcat:keyword>Internal combustion engine</dcat:keyword>
    <dcat:keyword>organic rankine cycle</dcat:keyword>
    <dcat:keyword>waste heat recovery</dcat:keyword>
    <dcat:keyword>working fluids.</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-01-01</dct:issued>
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    <dct:description>Waste heat recovery by means of Organic Rankine&lt;br&gt; Cycle is a promising technology for the recovery of engine&lt;br&gt; exhaust heat. However, it is complex to find out the optimum&lt;br&gt; cycle conditions with appropriate working fluids to match exhaust&lt;br&gt; gas waste heat due to its high temperature. Hence, this paper&lt;br&gt; focuses on comparing sub-critical and supercritical ORC conditions&lt;br&gt; with eight working fluids on a combined diesel engine-ORC&lt;br&gt; system. The model employs two ORC designs, Regenerative-ORC&lt;br&gt; and Pre-Heating-Regenerative-ORC respectively. The thermodynamic&lt;br&gt; calculations rely on the first and second law of thermodynamics,&lt;br&gt; thermal efficiency and exergy destruction factors are the fundamental&lt;br&gt; parameters evaluated. Additionally, in this study, environmental&lt;br&gt; and safety, GWP (Global Warming Potential) and ODP (Ozone&lt;br&gt; Depletion Potential), characteristic of the refrigerants are taken&lt;br&gt; into consideration as evaluation criteria to define the optimal ORC&lt;br&gt; configuration and conditions. Consequently, the studys outcomes&lt;br&gt; reveal that supercritical ORCs with alkane and siloxane are more&lt;br&gt; suitable for high temperature exhaust waste heat recovery in contrast&lt;br&gt; to sub-critical conditions.</dct:description>
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