A comparative study on exergetic, exergoeconomic and exergoenvironmental assessments of two internal auto-cascade refrigeration cycles

作者：Boyaghchi Fateme Ahmadi^*; Asgari Sahar

来源：Applied Thermal Engineering, 2017, 122: 723-737.

DOI：10.1016/j.applthermaleng.2017.05.065

• Internal auto-cascade refrigeration
• Ejector
• Exergy
• Total product cost rate
• Environmental impact

This research makes a comparative study of an internal auto-cascade refrigeration system (IACRS), i.e. system 1, and a novel ejector enhanced IACRS, or system 2, employing a pressure-constant ejector at the entrance of the phase separator based on exergy, exergoeconomic and exergoenvironmental analyses. R600 is used as a convenient refrigerant in the proposed systems. Compressor mass flow rate (M-1) condenser inlet temperature (T-3), refrigeration evaporator inlet temperature (T-6) and freezer evaporator inlet temperature (T-11) are chosen as substantial design parameters to evaluate the performance of both proposed systems. The simulation and comparative study show that at all ranges of selected parameters, the average energy and exergy coefficient of performance, i.e. COPEn and COPE, respectively, obtained for system 2 have a drastic increment relative to system I. Moreover, outcomes identify system 2 as a more economic system due to its low total product cost rate (C-P,C-tot) at which nil with 20.95% decrement of C-P,C-tot has a significant positive effect. Further results show that the environmental impact is improved by applying system 2 so that the total product environmental impact rate associated with exergy (3p,tot) for m(1), T-3, T-6 and T-11 decreases within 21.52%, 10.59%, 8.96% and 8.35% respectively, as compared with system 1.

• 出版日期2017-7-25