大温差热泵中制冷剂与运行参数的匹配特性

Energies Pub Date : 2024-07-15 DOI:10.3390/en17143477
Hemin Hu, Tao Wang, Fan Zhang, Bing Zhang, Jian Qi
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引用次数: 0

摘要

确定使用特定制冷剂的热泵的最佳运行参数至关重要,因为它为制冷剂的选择提供了宝贵的指导。蒸发器和冷凝器中冷热流体之间的温度不匹配会导致温度变化较大的热泵热性能下降。为了解决这两个关键问题,我们选择了临界温度水平不同的几种纯制冷剂,用于温度变化较大的热泵配置中。然后使用 Ebsilon 代码研究了在固定温度提升条件下,随着工作温度的变化,相应的热性能。结果表明,当温度和压力与临界参数的偏差系数分别在 0.62~0.71 和 0.36~0.5 范围内时,通常能达到最大性能系数(COP)。与纯 R1336mzz (z)(COP = 2.87)和 R152a(COP = 3.01)相比,R1336mzz (z)能显著提高热性能,因此我们的研究推荐在当前运行条件下使用 R152a/R1336mzz (z)(COP = 3.54)二元混合制冷剂。通过研究 R152a/R1336mzz(z) 成分比例对热泵热性能的影响,我们发现 R1336mzz(z) 成分与 R152a 成分的最佳比例为 0.5/0.5。这项研究为在实际工程设计中为热泵选择最合适的制冷剂提供了宝贵的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Matching Characteristics of Refrigerant and Operating Parameters in Large Temperature Variation Heat Pump
Characterizing the optimal operating parameters for a heat pump with a specific refrigerant is paramount, as it provides valuable guidance for refrigerant selection. The temperature mismatch between cold and hot fluids in the evaporator and condenser can lead to degraded thermal performance in heat pumps with large temperature variations. To address these two key issues, we selected several pure refrigerants with varying critical temperature levels for use in a large temperature variation heat pump configuration. The corresponding thermal performance was then investigated using the Ebsilon code under fixed temperature lift conditions as the operating temperature varied. It indicates that the maximum coefficient of performance (COP) is typically achieved when the deviation factors of temperature and pressure from their critical parameters fall within the ranges of 0.62~0.71 and 0.36~0.5, respectively. Our research recommends the binary refrigerant mixture of R152a/R1336mzz(z) (COP = 3.54) for the current operating conditions, as it significantly improves thermal performance compared to pure R1336mzz (z) (COP = 2.87) and R152a (COP = 3.01). Through research on the impact of the compositional ratio of R152a/R1336mzz(z) on the thermal performance of the heat pump, we found that that the optimal ratio of R1336mzz(z) component to R152a component is 0.5/0.5. This study offers valuable guidance for selecting the most suitable refrigerants for heat pumps in practical engineering design scenarios.
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