Performance analysis of multistep sorption energy storage using compound adsorbents

Abstract

Summary The multistep sorption‐reaction cycle utilizes heat from several processes, such as absorption, dilution, crystallization reaction, and thermochemical reaction. So, it is very attractive to use multistep sorption technology to improve the performance of temperature transmitter, air conditioning, and heat pump. Different working pairs of silica gel/LiCl, activated carbon/LiCl multiwalled carbon nanotubes/LiCl, and multiwalled carbon nanotubes/CaCl2 are tested and compared. The results show that the water uptake of these compound adsorbents varies with different salt mass fraction. The water uptake goes up dramatically at the crystallization and deliquescence point. Compared with the energy storage performance under the same working conditioning, the activated carbon/LiCl has the best performance, and the possible reason is that the activated carbon has the largest specific surface and the smallest average pore diameter.

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

“…The active technologies including mechanical vapor compressor, sorption heat pump/chiller, and Organic Rankine Cycle reuse the waste heat to achieve heating, cooling, or power generation purpose. The passive technologies consist of heat exchanger and Thermal Energy Storage technologies which directly recovery the waste heat at the same or at lower temperature level. During the last two decades, adsorption heat pump/transformer belonging to the active waste heat recovery technologies have attracted many researchers' attention as its advantages of environment‐friendly and low cost.…”

Verification of hydrothermal stability of adsorbent materials for thermal energy storage

“…Particularly, sorption TES, belonging to the wider class of thermochemical TES, attracted a lot of attention during recent years, especially for storage at low/medium temperatures (eg, lower than 150°C). Indeed, it is characterized by high TES density and virtual no degradation of the stored heat during the storage period, since the thermal energy is stored as sorption potential between a working fluid (eg, water, ammonia) and a storage media (eg, porous sorbent, salt, and liquid solution) …”

“…Indeed, it is characterized by high TES density and virtual no degradation of the stored heat during the storage period, since the thermal energy is stored as sorption potential between a working fluid (eg, water, ammonia) and a storage media (eg, porous sorbent, salt, and liquid solution). 12,13 The sorption TES technology is still facing several challenges at material, components, and system levels, 14 which are hindering its widespread applicability. Among them, one of the most known issues, at material level, is represented by the hydrothermal operating conditions to which the adsorbent material is subjected during its lifetime.…”

Sustainable and open sorption system for low‐temperature heat storage applications

“…19 In addition to the experimental studies, several numerical simulations were also carried out. 27,28 A new regeneration strategy was introduced to the open sorption system using the TRNSYS. 29 In this study, the zeolite and zeolite-based composite materials were used as TCMs.…”