Exergy-based sustainability assessment of a modified cascade refrigeration cycle including an ejector-enhanced auto-cascade refrigeration cycle

Makaleler > Tam Makale · 2026

Yazarlar: İbrahim KARAÇAYLI, Lütfiye ALTAY, Arif Hepbaşlı

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Scopus, 2026, cilt 151, ss 8061-8077

DOI: 10.1007/s10973-026-15543-y

Özet

<p>This&nbsp;study&nbsp;presents&nbsp;a&nbsp;sustainability-focused&nbsp;assessment&nbsp;of&nbsp;previously&nbsp;developed&nbsp;auto-cascade&nbsp;refrigeration&nbsp;(ACR)&nbsp;models&nbsp;using&nbsp;exergy-based&nbsp;parameters,&nbsp;highlighting&nbsp;their&nbsp;performance&nbsp;not&nbsp;only&nbsp;in&nbsp;terms&nbsp;of&nbsp;energy&nbsp;and&nbsp;exergy&nbsp;analyses&nbsp;but&nbsp;also&nbsp;through&nbsp;sustainability&nbsp;indicators&nbsp;reported&nbsp;in&nbsp;the&nbsp;literature.&nbsp;Unlike&nbsp;many&nbsp;studies&nbsp;that&nbsp;focus&nbsp;solely&nbsp;on&nbsp;thermodynamic&nbsp;perfor-mance,&nbsp;the&nbsp;present&nbsp;work&nbsp;also&nbsp;evaluates&nbsp;the&nbsp;environmental&nbsp;and&nbsp;sustainability&nbsp;impacts&nbsp;of&nbsp;four&nbsp;modified&nbsp;cascade&nbsp;refrigeration&nbsp;(MCR)&nbsp;configurations,&nbsp;including&nbsp;the&nbsp;ejector-enhanced&nbsp;MCR&nbsp;(MECR)&nbsp;cycle.&nbsp;A&nbsp;binary&nbsp;refrigerant&nbsp;mixture&nbsp;of&nbsp;R170/R290&nbsp;is&nbsp;used&nbsp;in&nbsp;the&nbsp;low-temperature&nbsp;cycle&nbsp;(LTC),&nbsp;and&nbsp;R1234yf&nbsp;in&nbsp;the&nbsp;high-temperature&nbsp;cycle&nbsp;(HTC).&nbsp;In&nbsp;the&nbsp;LTC,&nbsp;the&nbsp;use&nbsp;of&nbsp;low-GWP&nbsp;refrigerants&nbsp;with&nbsp;flammable&nbsp;characteristics&nbsp;poses&nbsp;a&nbsp;risk&nbsp;of&nbsp;elevated&nbsp;compressor&nbsp;discharge&nbsp;temperatures,&nbsp;particularly&nbsp;at&nbsp;low&nbsp;evaporation&nbsp;temperatures.&nbsp;To&nbsp;mitigate&nbsp;this&nbsp;risk,&nbsp;the&nbsp;refrigerant&nbsp;mixture&nbsp;is&nbsp;precooled&nbsp;via&nbsp;the&nbsp;cascade&nbsp;cycle&nbsp;before&nbsp;entering&nbsp;the&nbsp;separator,&nbsp;thereby&nbsp;reducing&nbsp;the&nbsp;compressor&nbsp;outlet&nbsp;temperature.&nbsp;As&nbsp;a&nbsp;result,&nbsp;the&nbsp;compressor&nbsp;discharge&nbsp;temperature&nbsp;is&nbsp;reduced&nbsp;by&nbsp;35.1%&nbsp;in&nbsp;the&nbsp;MCR-1&nbsp;and&nbsp;MCR-3&nbsp;configurations&nbsp;and&nbsp;by&nbsp;36.9%&nbsp;in&nbsp;the&nbsp;MECR&nbsp;configuration.&nbsp;Based&nbsp;on&nbsp;data&nbsp;reported&nbsp;in&nbsp;the&nbsp;literature,&nbsp;MCR-2&nbsp;configuration&nbsp;exhibits&nbsp;improvements&nbsp;in&nbsp;exergy&nbsp;efficiency&nbsp;ranging&nbsp;from&nbsp;9.3&nbsp;to&nbsp;55.5%,&nbsp;whereas&nbsp;the&nbsp;MECR&nbsp;cycle&nbsp;achieves&nbsp;increases&nbsp;between&nbsp;11.3&nbsp;and&nbsp;58.2%.&nbsp;Furthermore,&nbsp;the&nbsp;MECR&nbsp;cycle&nbsp;reduces&nbsp;the&nbsp;ecological&nbsp;and&nbsp;environmental&nbsp;effect&nbsp;factors&nbsp;by&nbsp;up&nbsp;to&nbsp;17.9%&nbsp;and&nbsp;23.8%,&nbsp;respectively,&nbsp;compared&nbsp;to&nbsp;the&nbsp;MCR-2&nbsp;configuration,&nbsp;while&nbsp;increasing&nbsp;the&nbsp;exergetic&nbsp;sustainability&nbsp;index&nbsp;by&nbsp;up&nbsp;to&nbsp;31.2%.&nbsp;These&nbsp;findings&nbsp;demonstrate&nbsp;that&nbsp;the&nbsp;previously&nbsp;developed&nbsp;models&nbsp;provide&nbsp;significant&nbsp;improvements&nbsp;not&nbsp;only&nbsp;in&nbsp;thermodynamic&nbsp;performance&nbsp;but&nbsp;also&nbsp;in&nbsp;sustainability&nbsp;metrics,&nbsp;extending&nbsp;their&nbsp;applicability&nbsp;beyond&nbsp;energy&nbsp;and&nbsp;exergy-based&nbsp;analyses.</p>

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