Energy and emission performance of enhanced vapor injection air source heat pump system using low global warming potential refrigerants in different climate regions

Frontiers in Energy Research Pub Date : 2023-11-15 DOI:10.3389/fenrg.2023.1297866

Libiao Zhang, Wuhui Jing, Qilong Wang, Jianing Zhang, Peifang Yang

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Abstract

In order to meet the space heating requirement of residential buildings in low-temperature areas, the performance of the enhanced vapor injection (EVI) air source heat pump (ASHP) system and single-stage compression heat pump system (BASE) using low global warming potential (GWP) working fluids in low-temperature environment are studied. The thermodynamic and emission characteristic models of air source heat pump are developed and optimized, and further compared with traditional heating solutions when used in five different typical cities throughout the world. The results indicate among the selected working fluids, R152a achieves the highest COP of 3.91 among all of the selected low GWP working fluids. When the ambient temperature is 0°C, the maximum COP of the EVI system is 2.51 when CO2 is adopted, and the corresponding optimal discharge pressure and intermediate pressure are 10.57 MPa and 3.83 MPa, respectively. By exploring the changes of HSPF in five typical cities, the HSPF of the EVI system using CO2 is the most significant, which is 17.13%–26.69% higher than the BASE system. The most significant reduction of LCCP in EVI system using CO2 is 15.34%–26.66% compared with BASE system. For SO2 and NOX, the EVI system using R152a has a better emission reduction effect, which is 3.73%–64.73% and 3.72%–66.04% lower than the other solutions, respectively. This study can provide a theoretical reference for the application of low GWP heat pumps with EVI technology.

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不同气候区使用低全球升温潜能值制冷剂的增强型喷气增焓空气源热泵系统的能效和排放性能

为了满足低温地区住宅建筑的空间供暖要求，研究了在低温环境下使用低全球升温潜能值（GWP）工作流体的增强型喷气增焓（EVI）空气源热泵（ASHP）系统和单级压缩热泵系统（BASE）的性能。建立并优化了空气源热泵的热力学和排放特性模型，并在全球五个不同的典型城市中与传统供热解决方案进行了进一步比较。结果表明，在所有选定的低全球升温潜能值工作流体中，R152a 的 COP 最高，达到 3.91。当环境温度为 0°C 时，采用 CO2 时，EVI 系统的最大 COP 为 2.51，相应的最佳排放压力和中间压力分别为 10.57 MPa 和 3.83 MPa。通过探究五个典型城市的 HSPF 变化，采用 CO2 的 EVI 系统的 HSPF 最大，比 BASE 系统高 17.13%-26.69%。与 BASE 系统相比，使用 CO2 的 EVI 系统的 LCCP 降低幅度最大，为 15.34%-26.66%。对于二氧化硫和氮氧化物，使用 R152a 的 EVI 系统具有更好的减排效果，分别比其他方案低 3.73%-64.73% 和 3.72%-66.04% 。该研究可为采用 EVI 技术的低 GWP 热泵的应用提供理论参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Frontiers in Energy Research

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