Kinetic of desorption in chemisorption heat pump technology for solar thermal energy storage

Ahmad Najjaran, Zhiwei Ma, Huashan Bao and Tony Roskilly

Energy, 2025, vol. 326, issue C

Abstract: In this research, the kinetics of the desorption process within chemisorption heat pump systems are studied, particularly for storing thermal energy. Chemisorption heat pumps, recognised for their heating and cooling capabilities, have recently been explored for their potential in energy storage. This technology stands out for its ability to function as seasonal energy storage by harnessing solar energy. A key aspect under investigation is the behaviour of the desorption process of adsorbent and the release of ammonia for storage. This study employs a mixture of strontium chloride (SrCl2) and expanded graphite as a composite material. It examined the reactor’s kinetics and the heat dissipation within a single core of the reactor, noting that approximately four minutes are required for the heat to fully dissipate in a single core. Its operation at temperatures ranging from 76 °C to 101 °C was studied, which desorbed 1.4 kg of ammonia within 35 to 110 min. Additionally, a solar heat source in a scenario to power the system was investigated, which reveals a surface energy density of 2.5 kWh/m2 and a levelised cost of energy of £0.375/kWh over a 30-year life-cycle. This cost is 2.5 times higher than that of conventional air–water heat pumps.

Keywords: Chemisorption; Experimental apparatus; Adsorbent; Strontium chloride; Kinetics; Conversion ratio (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:326:y:2025:i:c:s0360544225018390

DOI: 10.1016/j.energy.2025.136197

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