Abstract
Hydrogen and metal hydride reactions in a decarbonized heat pump system with low-grade waste heat recovery offer a promising path for sustainable energy storage and conversion. Based on actual metal hydride reactor designs, this study developed a 2D transient Computational Fluid Dynamics (CFD) model for such a heat pump system working with hydrogen and a metal hydride alloy pair of Zr0.9Ti0.1Cr0.6Fe1.4 and LaNi4.25Al0.75. The effects of operating temperatures on the coefficient of performance (COP) and specific heat power (SHP) of the system have been presented and analyzed. Subsequently, raising the medium-temperature heat sink (TM) from 358.15 K to 373.15 K, and low-temperature heat source (TL) from 308.15 K to 323.15 K, results in a decrease in the COP by 25.57%, and an increase in the COP by 38.2%, respectively. An optimum value of high-temperature heat source (TH) exists at 493.15 K for a maximum COP. In addition, the higher thermal conductivity increases the absorption and desorption capacity of hydrogen.
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