Investigating the Novel Ejector-Enhanced Auto-Cascade Refrigeration Cycle with R170/R600 Under Variable Evaporation and Condensation Temperatures

Kitapta bölümler > Araştırma Kitabı · 2026

Yazarlar: İbrahim KARAÇAYLI, Lütfiye ALTAY, Arif Hepbaşlı

Energy Management, Volume One. Green Energy and Technology, Araştırma Kitabı, Springer Nature, B, Uluslararası, 2026, ss 179-188, İsviçre, Cham

DOI: 10.1007/978-3-031-94536-6_16

Özet

<p><span style="background-color: rgb(255, 255, 255); color: rgb(34, 34, 34);">This&nbsp;chapter&nbsp;presents&nbsp;the&nbsp;operational&nbsp;principles&nbsp;of&nbsp;the&nbsp;novel&nbsp;ejector-enhanced&nbsp;auto-cascade&nbsp;refrigeration&nbsp;(NEACR)&nbsp;cycle,&nbsp;which&nbsp;is&nbsp;suggested&nbsp;as&nbsp;an&nbsp;alternative&nbsp;to&nbsp;conventional&nbsp;cascade&nbsp;refrigeration&nbsp;cycles.&nbsp;It&nbsp;is&nbsp;particularly&nbsp;designed&nbsp;for&nbsp;applications&nbsp;requiring&nbsp;low&nbsp;and&nbsp;ultra-low&nbsp;temperatures.&nbsp;The&nbsp;main&nbsp;purpose&nbsp;is&nbsp;to&nbsp;evaluate&nbsp;the&nbsp;NEACR&nbsp;cycle&nbsp;performance&nbsp;under&nbsp;various&nbsp;operating&nbsp;conditions,&nbsp;taking&nbsp;into&nbsp;account&nbsp;parameters&nbsp;such&nbsp;as&nbsp;volumetric&nbsp;cooling&nbsp;effect,&nbsp;total&nbsp;compression&nbsp;work&nbsp;rate,&nbsp;coefficient&nbsp;of&nbsp;performance&nbsp;(COP),&nbsp;total&nbsp;exergy&nbsp;destruction&nbsp;rate,&nbsp;exergy&nbsp;efficiency&nbsp;of&nbsp;the&nbsp;entire&nbsp;system,&nbsp;and&nbsp;sustainability&nbsp;index.&nbsp;Energy&nbsp;and&nbsp;exergy&nbsp;analyses&nbsp;are&nbsp;employed&nbsp;to&nbsp;assess&nbsp;the&nbsp;NEACR&nbsp;cycle&nbsp;using&nbsp;the&nbsp;R170/R600&nbsp;refrigerant&nbsp;mixture&nbsp;at&nbsp;different&nbsp;evaporation&nbsp;and&nbsp;condensation&nbsp;temperatures.&nbsp;The&nbsp;findings&nbsp;reveal&nbsp;that&nbsp;the&nbsp;COP&nbsp;reaches&nbsp;its&nbsp;peak&nbsp;value&nbsp;of&nbsp;0.70,&nbsp;and&nbsp;the&nbsp;exergy&nbsp;efficiency&nbsp;reaches&nbsp;26.5%&nbsp;when&nbsp;the&nbsp;condensing&nbsp;temperature&nbsp;is&nbsp;reduced&nbsp;to&nbsp;20&nbsp;°C,&nbsp;with&nbsp;a&nbsp;mass&nbsp;fraction&nbsp;of&nbsp;0.48/0.52&nbsp;for&nbsp;R170/R600&nbsp;refrigerant,&nbsp;achieving&nbsp;an&nbsp;evaporation&nbsp;temperature&nbsp;of&nbsp;−60&nbsp;°C.&nbsp;Lowering&nbsp;the&nbsp;condensing&nbsp;temperature&nbsp;from&nbsp;40&nbsp;°C&nbsp;to&nbsp;20&nbsp;°C&nbsp;leads&nbsp;to&nbsp;a&nbsp;significant&nbsp;improvement,&nbsp;with&nbsp;COP&nbsp;and&nbsp;exergy&nbsp;efficiency&nbsp;increasing&nbsp;by&nbsp;30.9%,&nbsp;and&nbsp;the&nbsp;sustainability&nbsp;index&nbsp;improving&nbsp;by&nbsp;42.0%.&nbsp;Additionally,&nbsp;there&nbsp;is&nbsp;a&nbsp;decrease&nbsp;in&nbsp;total&nbsp;compression&nbsp;work&nbsp;rate&nbsp;by&nbsp;23.6%&nbsp;and&nbsp;total&nbsp;exergy&nbsp;destruction&nbsp;rate&nbsp;by&nbsp;29.6%.</span></p>

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