Study on the performance of an energy-efficient three-stage auto-cascade refrigeration system enhanced with a pressure regulator
Study on the performance of an energy-efficient three-stage auto-cascade refrigeration system enhanced with a pressure regulator
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压力调节器增强型节能三级自复叠制冷系统性能研究
DOI：
10.1016/j.energy.2022.124872
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发表时间：
2022-07
期刊：
影响因子：
9
通讯作者：
Baolin Liu
中科院分区：
文献类型：
--
作者：
Yanbin Qin;Nanxi Li;Hua Zhang;Baolin Liu
提出了一种带有中压调节器的改进的三级自串级制冷循环（MTARC）。能量和火用分析表明，MTARC具有较低的蒸发温度、较大的制冷量和较高的COP。在典型工况下，采用R1234yf/R41/R14（0.66/0.17/0.17）三元共沸混合物的MTARC蒸发器进口温度为- 90.90℃，COP为0.4509，火用效率为40.67%，比常规三级ARC分别降低4.63℃、32.93%和15.38%。进一步研究表明，随着中间压力的降低，MARC的热力学性能得到明显改善，但压缩机排气温度也随之升高。当中间压力从1.8 MPa降低到1 MPa时，MTARC的制冷量、COP和火用效率分别提高了30.34%、22.10%和13.79%，排气温度从116.66℃提高到135.25℃，提高了18.59℃，说明中间压力的选择需要综合考虑。提出的新方法对- 80°c超低温水平制冷机的优化设计和应用有价值。•提出了一种改进的带压力调节器的三级自级联制冷循环。•采用R1234yf/R41/R14三元共沸混合物替代。•改进循环的COP提高了32.93%。•火用效率的提高主要来自压缩机。
This paper proposed a modified three-stage auto-cascade refrigeration cycle (MTARC) associated with an intermediate pressure regulator. The energy and exergy analyses indicate that the MTARC can acquire lower evaporating temperature, greater cooling capacity and higher COP. Under a typical operating condition, the MTARC using the alternative ternary zeotropic mixture of R1234yf/R41/R14(0.66/0.17/0.17) has an evaporator inlet temperature of −90.90 °C, COP of 0.4509 and exergy efficiency of 40.67%, which are 4.63 °C lower, 32.93% and 15.38% higher than those of the conventional three-stage ARC, respectively. Further research shows that with the decreasing intermediate pressure, the thermodynamic performance of the MARC can be improved significantly, but the compressor exhaust temperature also increases. When the intermediate pressure decreases from 1.8 MPa to 1 MPa, the cooling capacity, COP and exergy efficiency of the MTARC increase by 30.34%, 22.10% and 13.79% respectively, while the exhaust temperature increases 18.59 °C from 116.66 °C to 135.25 °C, which indicates that the selection of intermediate pressure needs to be comprehensively considered. The proposed new approach is valuable for optimizing the design and application of the refrigerator at an ultra-low temperature level of −80 °C. • A modified three-stage auto-cascade refrigeration cycle with a pressure regulator is proposed. • The alternative ternary zeotropic mixture of R1234yf/R41/R14 is adopted. • The modified cycle has a 32.93% improvement in COP. • The improvement in the exergy efficiency is mainly contributed by the compressor.
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