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Water Transport in Aqueous Sodium Hydroxide Films for Liquid Sorption Heat Storage
Author(s) -
Fumey Benjamin,
Baldini Luca,
Borgschulte Andreas
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000187
Subject(s) - sorption , materials science , aqueous solution , heat exchanger , mass transfer , energy storage , thermal energy storage , chemical engineering , chemistry , thermodynamics , chromatography , power (physics) , organic chemistry , physics , adsorption , engineering
Compact interseasonal thermal storage is a key enabler for renewable heating. A promising approach is the liquid absorption process, extended with absorbent and absorbate storage. In sorption heat storage, the conventional parameters—temperature gain and power density, governing the sorption heat pump process—are extended by the parameter energy density. This opens up new challenges for heat and mass exchanger design, demanding a detailed understanding of the fundamental mass transport process under technically relevant constraints. Toward this objective, investigation in the water mass transport in a static aqueous sodium hydroxide thin film at application‐specific temperature and pressure using temporally and spatially resolved Raman spectroscopy is performed. Based on the measured concentration gradient in the film, it is determined that the mass transport in the film and not the liquid–gas interface is limiting.