Study of a long term solar thermal energy storage based on LiBr−H2O for house heating
type: Distribution
access URL: https://theses.hal.science/tel-00710249
format: HTML
issued: 2026-05-15T15:09:02.788142
modified: 2026-05-15T15:09:02.669962

test_moissonnage_selune
type: Agent

Study of a long term solar thermal energy storage based on LiBr−H2O for house heating
type: Dataset
contact point: Organization
  fn: CCSD
keyword: stockage-thermique-a-long-terme
keyword: prototype
keyword: absorption
keyword: bromure-de-lithium-eau
keyword: theses
keyword: spiengineering-sciences-physics
keyword: infoeu-reposemanticsdoctoralthesis
keyword: long-term-thermal-storage
keyword: lithium-bromide-water
keyword: chauffage-solaire
keyword: solat-thermal-storage
keyword: solar-heating
keyword: stockage-solaire-thermique
landing page: https://theses.hal.science/tel-00710249
description: Energy storage is a key component to improve the efficiency of energy systems, especially when the energy source is intermittent, such as solar energy. Heat storage systems based on sorption processes are relevant in case of long-term storage (seasonal or pluriannual storage) because of their acceptable heat losses. Even though considerable breakthroughs have been made in the past decades, there is no mature long-term sorption heat storage yet. The aim of this work is to demonstrate the feasibility of a long term solar thermal storage by absorption for building space heating. Solar heat is stored in summer using desorption process and released in winter via absorption. A multicriteria analysis on various possible absorption couples leads to the choice of LiBr−H2O as storage media for the concept feasibility demonstration. It has been shown that crystallisation in the solution storage tank can increase the storage density by three times and therefore, is relevant for the process competiveness. A dynamic model has been developed for the system design and simulations under various operating conditions were performed. A lot of parametric simulations are used to investigate the influence of certain parameters and controls aspects. This helps designing a demonstrative prototype that can store 8 kWh of heat and can produce a heating power of 1 kW. The prototype has been built and tested on a test bed in static and dynamic operating conditions that are compatible with domestic solar thermal plants. The charging process has been proved successful. Absorption during discharging phase is also verified. However, some problems related to the absorber design have not made possible to observe the heat release as expected. Various aspects such as stratification and circulation in the solution storage tank have also been addressed. The model comparison with experimental result is then performed and discussed.
identifier: NNT: 2012GRENA005
issued: 2026-05-15T15:09:02.698755
language: fr
modified: 2026-05-15T15:09:02.698761