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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  "created": "2018-07-19T17:29:30.715842+00:00", 
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    "description": "Waste heat recovery by means of Organic Rankine<br>\nCycle is a promising technology for the recovery of engine<br>\nexhaust heat. However, it is complex to find out the optimum<br>\ncycle conditions with appropriate working fluids to match exhaust<br>\ngas waste heat due to its high temperature. Hence, this paper<br>\nfocuses on comparing sub-critical and supercritical ORC conditions<br>\nwith eight working fluids on a combined diesel engine-ORC<br>\nsystem. The model employs two ORC designs, Regenerative-ORC<br>\nand Pre-Heating-Regenerative-ORC respectively. The thermodynamic<br>\ncalculations rely on the first and second law of thermodynamics,<br>\nthermal efficiency and exergy destruction factors are the fundamental<br>\nparameters evaluated. Additionally, in this study, environmental<br>\nand safety, GWP (Global Warming Potential) and ODP (Ozone<br>\nDepletion Potential), characteristic of the refrigerants are taken<br>\ninto consideration as evaluation criteria to define the optimal ORC<br>\nconfiguration and conditions. Consequently, the studys outcomes<br>\nreveal that supercritical ORCs with alkane and siloxane are more<br>\nsuitable for high temperature exhaust waste heat recovery in contrast<br>\nto sub-critical conditions.", 
    "language": "eng", 
    "title": "Comparative Study of Sub-Critical and Supercritical ORC Applications for Exhaust Waste Heat Recovery", 
    "license": {
      "id": "CC-BY-4.0"
    "journal": {
      "volume": "11.0", 
      "issue": "2", 
      "title": "International Journal of Electrical, Electronic and Communication Sciences"
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    "keywords": [
      "Internal combustion engine", 
      "organic rankine cycle", 
      "waste heat recovery", 
      "working fluids."
    "publication_date": "2018-01-01", 
    "creators": [
        "name": "Buket Boz"
        "name": "Alvaro Diez"
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