EXERGY BASED SUSTAINABILITY ASSESSMENT OF AN ORC INTEGRATED WASTE HEAT RECOVERY SYSTEM FOR MARINE VESSELS
Öz
This paper introduces the basics of exergy based sustainability assessment and the framework that should be shaped within in the first stage. The sustainability assessment framework leads to sustainability indicators that are used to assist policy makers and decision-making processes. The literature review shows that the energy systems are suited to sustainability assessment with exergy based assessment tools and indicators from an environmental point of view. In this study, an exergy based sustainability assessment is carried out by using the exergy analyses results of an ORC (organic Rankine cycle) integrated waste heat recovery system on a 1,221 TEU container ship. The exergy analysis results are used to derive comparable and quantified exergetic sustainability indicators that indicate the sustainability level and further improvement potentials with the utilization of the proposed waste heat recovery system design. The assessment results show that the minimum waste exergy ratio is obtained from R1234ze(Z) at 3 MPa with the value of 0.106. R1234ze(Z) and R245fa working fluids show good environmental performance for the proposed system design. The maximum exergetic sustainability index values are obtained from R1234ze(Z) and at 3 MPa at the value of 8.435.
Anahtar Kelimeler
Sustainability, exergy, organic Rankine cycle, waste heat recovery system, marine engineering
Kaynakça
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