Energy and Exergy Performance of a Novel Auto-Cascade Rankine Cycle using binary zeotropic working fluid mixtures

Bildiriler > Tam Metin Bildiri · 2026

Yazarlar: İbrahim KARAÇAYLI

3rd International Symposium on Energy Management and Sustainability (ISEMAS-2026), Türkiye, İstanbul, Uluslararası, Sözlü Sunum, Tam Metin Bildiri, 2026-2026, ss 1-4

Özet

<p>This&nbsp;study&nbsp;presents&nbsp;a&nbsp;thermodynamic&nbsp;assessment&nbsp;of&nbsp;a&nbsp;novel&nbsp;auto-cascade&nbsp;Rankine&nbsp;(NACR)&nbsp;cycle&nbsp;incorporating&nbsp;a&nbsp;regenerator,&nbsp;high-&nbsp;and&nbsp;low-temperature&nbsp;recuperators&nbsp;for&nbsp;low-grade&nbsp;heat&nbsp;recovery.&nbsp;The&nbsp;effects&nbsp;of&nbsp;the&nbsp;mixture&nbsp;composition&nbsp;and&nbsp;separator&nbsp;vapor&nbsp;quality&nbsp;are&nbsp;investigated&nbsp;for&nbsp;four&nbsp;binary&nbsp;zeotropic&nbsp;mixtures&nbsp;under&nbsp;the&nbsp;same&nbsp;operating&nbsp;conditions.&nbsp;The&nbsp;total&nbsp;heat&nbsp;input&nbsp;rate,&nbsp;net&nbsp;power&nbsp;output,&nbsp;thermal&nbsp;efficiency,&nbsp;total&nbsp;exergy&nbsp;destruction&nbsp;rate,&nbsp;and&nbsp;exergy&nbsp;efficiency&nbsp;are&nbsp;evaluated&nbsp;over&nbsp;the&nbsp;investigated&nbsp;ranges&nbsp;of&nbsp;mixture&nbsp;composition&nbsp;and&nbsp;separator&nbsp;vapor&nbsp;quality.&nbsp;The&nbsp;results&nbsp;show&nbsp;that&nbsp;both&nbsp;parameters&nbsp;have&nbsp;a&nbsp;significant&nbsp;effect&nbsp;on&nbsp;the&nbsp;thermodynamic&nbsp;performance&nbsp;of&nbsp;the&nbsp;NACR&nbsp;cycle,&nbsp;and&nbsp;the&nbsp;operating&nbsp;conditions&nbsp;corresponding&nbsp;to&nbsp;the&nbsp;maximum&nbsp;net&nbsp;power,&nbsp;maximum&nbsp;thermal&nbsp;efficiency,&nbsp;minimum&nbsp;exergy&nbsp;destruction,&nbsp;and&nbsp;maximum&nbsp;exergy&nbsp;efficiency&nbsp;are&nbsp;generally&nbsp;different.&nbsp;The&nbsp;maximum&nbsp;net&nbsp;power&nbsp;output&nbsp;reaches&nbsp;76.4&nbsp;kW&nbsp;for&nbsp;isobutane/isopentane,&nbsp;while&nbsp;the&nbsp;highest&nbsp;thermal&nbsp;efficiency&nbsp;is&nbsp;18.19%&nbsp;for&nbsp;R152a/n-hexane.&nbsp;The&nbsp;minimum&nbsp;total&nbsp;exergy&nbsp;destruction&nbsp;is&nbsp;16.6&nbsp;kW&nbsp;for&nbsp;R227ea/n-hexane,&nbsp;whereas&nbsp;the&nbsp;highest&nbsp;exergy&nbsp;efficiency&nbsp;is&nbsp;67.65%&nbsp;for&nbsp;isobutane/isopentane.</p>

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