Journal article Open Access

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

Buket Boz; Alvaro Diez

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    <subfield code="a">Internal combustion engine</subfield>
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    <subfield code="a">organic rankine cycle</subfield>
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    <subfield code="a">waste heat recovery</subfield>
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    <subfield code="a">Comparative Study of Sub-Critical and Supercritical ORC Applications for Exhaust Waste Heat Recovery</subfield>
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    <subfield code="a">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.</subfield>
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