Exergy-Based Performance Assessment of an Ejector-Enhanced Auto-Cascade Refrigeration Cycle
Bildiriler > Tam Metin Bildiri · 2023
Yazarlar: İbrahim KARAÇAYLI, Lütfiye ALTAY, Arif Hepbaşlı
14th International Exergy, Energy and Environment Symposium (IEEES-14), Türkiye, İstanbul, Uluslararası, Sözlü Sunum, Tam Metin Bildiri, 2023-2023, ss 57-60
Özet
<p>This study assesses the exergetic performance of a modified ejector-enhanced auto-cascade refrigeration (MEACR) cycle under various operating conditions and compares it with a conventional automatic cascade refrigeration (ACR) cycle. A parametric investigation is also conducted on the system basis for different vapor qualities at the condenser outlet and varying mass fractions of the low-boiling-component. The primary objective is to enhance exergy efficiency while simultaneously minimizing the total exergy destruction. To achieve these goals, the study employs strategies, such as reducing the vapor quality of the refrigerant at the evaporator inlet, maintaining a lowered condensing temperature of 20°C irrespective of high outdoor temperatures, and incorporating an ejector into the system. As a result of these measures, the exergy efficiency increases by 20.02% when the vapor quality at the condenser outlet is increased from 0.42 to 0.58. Additionally, a 5.5% improvement in the exergy efficiency is observed with raising the mass fraction of R170 from 42% to 58%. Moreover, the study records a notable enhancement, with an exergy destruction rate improvement of up to 88.94% compared to the ACR cycle. Moreover, the study records a remarkable improvement with an increase in exergy destruction rate up to 88.94% compared to the ACR cycle. </p>