CO₂ hydrate can be used as an alternate cooling substance in air-conditioning systems to minimize the use of traditional refrigerants, such as HFCs and HCFCs. A novel CO₂ hydrate-based refrigeration system with a function of cold energy storage was designed and investigated, using tetrahydrofuran (THF) as the thermodynamic promoter. Coefficient of performance (COP) of this system was calculated based on the simulation results. Effects of various operation parameters were also studied closely. The cold storage operation was then designed to investigate the energy storage ability of the current system. Results show that the system COP is 6.8, which is the major strength of this novel system. Because of the energy intensive process of CO₂ compression, the work imposed on elevating the gas pressure was considerable. A search for more appropriate additives or alternate guest substances should be conducted. In addition, compressor efficiency and pump efficiency are both critical for improving the energy efficiency. Enhanced refrigeration performance can also be realized at higher hydrate mass fraction. In addition, two different cold energy storage operation strategies were obtained. This research is of great significance to the in-depth development of hydrate-based refrigeration and cold energy storage system. The proposed system might contribute to minimizing the use of conventional coolants and realizing peak load shifting in the near future.

中文翻译：

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新型蓄冷CO ₂水合物制冷系统的概念设计与分析

CO ₂水合物可在空调系统中用作替代冷却物质，以最大程度地减少传统制冷剂（例如HFC和HCFC）的使用。以四氢呋喃（THF）为热力学促进剂，设计并研究了一种新型的基于CO ₂水合物的冷能制冷系统。根据仿真结果计算了该系统的性能系数（COP）。还仔细研究了各种操作参数的影响。然后设计冷库操作以研究当前系统的能量存储能力。结果表明，该系统的COP为6.8，这是该新颖系统的主要优势。由于CO ₂的能源密集型过程在压缩过程中，提高气压的工作相当可观。应寻找更合适的添加剂或替代客体物质。此外，压缩机效率和泵效率对于提高能源效率都是至关重要的。在较高的水合物质量分数下也可以实现增强的制冷性能。另外，获得了两种不同的冷能存储操作策略。该研究对深入开发基于水合物的制冷和冷能存储系统具有重要意义。拟议的系统可能有助于最大程度地减少传统冷却剂的使用，并在不久的将来实现峰值负荷转移。