Performance analysis of a metal hydride refrigeration system
Performance analysis of a metal hydride refrigeration system
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金属氢化物制冷系统性能分析
DOI：
10.1016/j.applthermaleng.2023.121264
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发表时间：
2023
影响因子：
6.4
通讯作者：
Ge Y
中科院分区：
文献类型：
--
作者：
Ge Y
金属氢化物制冷系统的各种应用，如冷藏和空间空调，赋予了它们相对于传统制冷系统的重要优势。这些优势包括作为一种低品位的热驱动、更环保和可再生的工作液，具有更高的紧凑性和更少的运动部件。然而，金属氢化物制冷系统总是在不稳定的条件下运行，这是因为涉及到循环氢化和脱水过程。为了分析和优化金属氢化物制冷系统的设计和性能，本文建立了一个综合的暂态系统模型，该模型包含了基本的操作控制和适用的回热、冷却以及其间转换的过程条件。此外，还建立了用于该系统的金属氢化物合金的压力、浓度和温度(PCT)曲线表征过程的关联模型，并作了简要介绍。它集成在系统模型中，确保了对金属氢化物等温解吸过程的最大容量的准确预测。通过与文献中金属氢化物制冷系统中温冷却过程的实验结果的比较，验证了所建立的暂态系统模型的有效性。针对专门设计的低温金属氢化物制冷系统，在不同的运行工况和控制方式下进行了模型仿真。在数量上，当高级热源温度从90℃上升到120℃时，低级热源温度从−20℃上升到10℃，中级散热器温度从30℃下降到15℃，回热或冷却过程的时间从10分钟减少到4分钟，冷却COP分别增加了112.0%、136.6%、19.3%和31.8%。因此，在对系统仿真结果进行详细性能分析的基础上，提出了系统运行状态和控制的优化策略。
The varying applications of metal hydride refrigeration systems, such as cold storage and space air conditioning, grant them important advantages over conventional ones. These advantages include being a low-grade heat driven, more environmentally friendly and renewable working fluid with greater compactness and fewer moving parts. However, a metal hydride refrigeration system always operates under unsteady conditions due to the cyclic hydriding and dehydriding processes involved. To analyse and optimise the metal hydride refrigeration system’s design and performance, in this paper, a comprehensive transient system model has been developed with a new and revised intrinsic kinetic correlation inclusive of the essential operating controls and applicable process conditions of regeneration, cooling and transitions in between. In addition, the correlative model on the characterisation process of pressure, concentration and temperature (PCT) profiles for the metal hydride alloys employed in the system has been developed and is introduced briefly in this paper. It is integrated in the system model and ensures the accurate prediction of maximum capacities for the metal hydride isothermal desorption and absorption processes. The developed transient system model has been validated through comparison with experimental results from literature on the medium-temperature cooling process of a metal hydride refrigeration system. The model simulation is conducted for a specially designed low-temperature metal hydride refrigeration system at different operating conditions and controls. In quantity, when the high-grade heat source temperature increases from 90 °C to 120 °C, the low-grade heat source temperature increases from −20 °C to 10 °C, the medium-grade heat sink temperature decreases from 30 °C to 15 °C, and the time period for regeneration or cooling process decreases from 10 min to 4 min, the cooling COP increases by 112.0%, 136.6%, 19.3% and 31.8% respectively. The optimisation strategies for the system operating conditions and controls are therefore recommended based on the detailed performance analyses of the system simulation results.
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