Thermodynamic analysis of auto-cascade high-temperature heat pump cycle using low GWP refrigerant

被引：0

作者：

Yang, Yuqing ^{[1
]}

Li, Yinlong ^{[1
]}

Yan, Gang ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an

来源：

Huagong Xuebao/CIESC Journal | 2025年 / 76卷

关键词：

auto-cascade heat pump cycle; energy analysis; exergy analysis; zeotropic mixed refrigerant;

D O I：

10.11949/0438-1157.20241362

中图分类号：

学科分类号：

摘要：

Addressing the issue of low energy efficiency in high-temperature heat pumps under large temperature difference heating conditions, a novel auto-cascade high-temperature heat pump cycle is proposed. The cycle employs a cascade heating strategy to achieve high-temperature water heating. The zeotropic mixed refrigerant with low GWP is selected due to temperature glide characteristics. The HCs refrigerant is chosen for the low-boiling composition. A thermodynamic mathematical model is constructed to analyze the energy and exergy performance of the modified cycle. The result indicates that within the range of outlet water temperature variation, the heating COP and heating capacity increase by an average of 49.36% and 44.30%. The mass flow rate of the refrigerant is reduced by an average of 50.53%. The exergy efficiency is enhanced by 3.47 times. Therefore, the modified cycle demonstrates potential for improvement in both energy and exergy performance. © 2025 Materials China. All rights reserved.

引用

页码：43 / 53

页数：10

共 34 条

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