Investigation on the influences of heat transfer enhancement measures in a thermally driven metal hydride heat pump

An optimization study on the finned tube heat exchanger used in hydride hydrogen storage system – analytical method and numerical simulation

“…The optimization results indicate that almost 80% improvement of the storage time can be achieved over the case where the tank is not optimized. Yang et al [22] numerically investigated the influences of heat transfer enhancement measures in a thermally driven metal hydride pump. Three reactors were taken in discussion, reactor packed with metal hydride powder, metal hydride powder/Al foam and metal hydride compact.…”

Multi-physical continuum models of thermochemical heat storage and transformation in porous media and powder beds—A review

“…An evaluation of three different absorber set-ups for use in a metal hydride heat pump was performed in Yang et al [202]. The absorbent used was LaNi 5 in three variants: As a powder, supported on aluminium foam and as a compact material with tin and copper as a binder.…”

“…Most of the reviewed works fall into this category. It was found, among others, that the performance is markedly affected by heat and mass transport resistances [92,112,121], by the heat transfer from the HX to the reactive material [136,155,202] and by the reaction bed geometry and HX design [85,111,123]. Operating conditions such as the regeneration temperature [84] or heat pump cycle time [121,147], also played an important role in this regard.…”

Assessment of errors on the kinetic data by entropy generation analysis

“…2b, with the same dimension as in [21] and filled with LaNi 5 , as this material is well studied and employed in the open literature. The process can be modeled by using conventional physical equations which describe a thermodynamically coupled reaction-transport processes [15], the main assumptions are as follows:…”

“…What could be the errors induced on the kinetics data (activation energy and frequency factor)? In response to these questions, two basic tools have been used in previous investigations [15,16]: the mass and energy balance. In this present work, another tool namely the second law of thermodynamics will be added to the two previous ones to account for thermal effects in the system.…”