Dynamic hydrogen sorption and its influence on metal hydride heat pump operation

Experimental and theoretical studies on static and dynamic pressure–concentration isotherms of MmNi 5−x Al x ( x = 0, 0.3, 0.5 and 0.8) hydrides

“…But the data obtained closely represents the practical condition. Additionally, for the simulation of any thermodynamic device van't Hoff plots obtained from dynamic PCI gives more realistic results [4].…”

“…The Lacher model has been extended to the consideration of the multi-plateau isotherms by Kierstead [21]. Lototsky and co-workers [22] extended it further to reproduce the behaviour of real system, by including a statistical thermodynamic approach and validated it for different hydrogen storage materials (ZrFe 2 , LaNi 4 2 ). An empirical PCI equilibrium correlation was also proposed for PCI simulation, which consists of adjusting the PCI with 9th order polynomial expression [27].…”

“…But the data obtained closely represents the practical condition. Additionally, for the simulation of any thermodynamic device van't Hoff plots obtained from dynamic PCI gives more realistic results [4].Metal hydride-based thermodynamic devices for different applications require different operating parameters like temperature range, charging pressure, pressure ratio, etc. [5].…”

Thermodynamic and heat‐hydrogen transfer analyses of novel multistage hydrogen‐alloy sorption heat pump

“…The influence of dynamic hydrogen sorption on the performance of heating application heat pump using a pair of LaNi 4.7 Al 0.3 ‐MmNi 4.5 Al 0.5 is reported by Tuscher et al A model for COP calculation of MHHP is reported by Nishizaki et al using LaNi 4.7 Al 0.3 ‐LaNi 5 pair. A research group in IIT Guwahati conducted thermodynamic analyses to determine the thermodynamic performance of single‐ and double‐stage MHHPs for cooling and heating applications using the pairs of different LaNi 5 and MmNi 5 MHs, ie, MmNi 4.6 Al 0.4 ‐MmNi 4.6 Fe 0.4 , LaNi 4.1 Al 0.52 Mn 0.38 ‐LmNi 4.91 Sn 0.15 ‐Ti 0.99 Zr 0.01 V 0.43 Fe 0.09 Cr 0.05 Mn 1.5 , La 0.35 Ce 0.45 Ca 0.2 Ni 4.95 Al 0.05 ‐LaNi 5 ‐LaNi 4.35 Al 0.65 , and LaNi 5 ‐LaNi 4.35 Al 0.65 .…”

“…The influence of dynamic hydrogen sorption on the performance of heating application heat pump using a pair of LaNi 4.7 Al 0.3 -MmNi 4.5 Al 0.5 is reported by Tuscher et al 11 25,26 presented a detailed procedure for screening of hydride pair, thermodynamic analysis, and heat and mass transfer analysis of multistage heating and cooling systems. It is also reported that the implementation of multistaging provides broad operating temperature range as well as better performance output.…”