Characterisation of pressure-concentration-temperature profiles for metal hydride hydrogen storage alloys with model development
Characterisation of pressure-concentration-temperature profiles for metal hydride hydrogen storage alloys with model development
复制标题
通过模型开发表征金属氢化物储氢合金的压力-浓度-温度曲线
作者：
Ge Y
金属氢化物（MH）合金已被应用于储氢和各种能量转换系统，如制冷、热泵和热Transformer。然而，为了促进和有效地研究特定的应用，必须首先用专门建造的测试设施来表征MH合金，以测量压力、MH氢浓度和温度的分布（PCT）。获得详细的PCT曲线或曲线可能是一项艰巨而昂贵的任务，因为每条等温氢吸收或解吸线需要数百个测量点。因此，希望开发一个准确的相关模型的PCT配置文件与有限的测量热物理性能数据的目的，每一个MH合金的特性。这相关的模型或表征过程已经开发，并在本文中详细描述。相关的PCT MH合金曲线可以覆盖α、α + β和β的所有适用的储氢相区域以及相变圆顶曲线和临界点，使得可以描绘和表征特定MH合金的PCT相图。作为应用实例，将关联模型应用于预测MH合金在特定MH温度下的贮氢容量和滞后。已经发现，这两个参数中的每一个都显示出随温度降低而变化的比较趋势。相应地，对于每个参数，与降低的温度的相关函数已经产生。MH合金表征过程是实现详细的动态MH能源系统建模、模拟和优化以及实验研究的重要一步。
Metal hydride (MH) alloys have been applied to hydrogen storage and various energy conversion systems such as refrigeration, heat pump and heat transformer. However, to facilitate and efficiently investigate efficiently a particular application, an MH alloy must firstly be characterised with a purposely built test facility to measure profiles of pressure, MH hydrogen concentration and temperature (PCT). Obtaining detailed PCT profiles or curves could be an arduous and expensive task as each isothermal hydrogen absorption or desorption line requires hundreds of measurement points. It is thus desirable to develop an accurate correlative model for the PCT profiles with limited measurements of thermophysical property data for the purpose of characterisation of each MH alloy. This correlative model or characterisation process has been developed and is described in detail in this article. The correlative PCT MH alloy profiles can cover all applicable hydrogen storage phase regions of α, α + β and β as well as the phase transition dome curve and critical point such that a PCT phase diagram for a particular MH alloy can be depicted and characterised. As an application example, the correlative model is applied to predict an MH alloy's hydrogen storage capacity and hysteresis at a specific MH temperature. It has been discovered that each of these two parameters shows comparative trends in variation with reduced temperature. Correspondingly, for each parameter, a correlative function with reduced temperature has been produced. The MH alloy characterisation process is an essential step towards a detailed dynamic MH energy system modelling, simulation and optimisation as well as experimental investigation.