Humidity dependence of transport properties of composite materials used for thermochemical heat storage and thermal transformer appliances

2018 ◽  
Vol 18 ◽  
pp. 160-170 ◽  
Author(s):  
Pierre D’Ans ◽  
Oleksandr Skrylnyk ◽  
Wolfgang Hohenauer ◽  
Emilie Courbon ◽  
Loïc Malet ◽  
...  
Keyword(s):  
Composite Materials ◽  
Transport Properties ◽  
Heat Storage ◽  
Thermochemical Heat Storage ◽  
Materials Used ◽  
Humidity Dependence ◽  
Thermal Transformer

scholarly journals Thermal properties of thermochemical heat storage materials

2020 ◽  
Vol 22 (8) ◽  
pp. 4617-4625 ◽  
Author(s):  
Julianne E. Bird ◽  
Terry D. Humphries ◽  
Mark Paskevicius ◽  
Lucas Poupin ◽  
Craig E. Buckley
Keyword(s):  
Thermal Properties ◽  
Energy Storage ◽  
Transport Properties ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Energy Storage Materials ◽  
Storage Materials ◽  
Thermochemical Heat Storage ◽  
Heat Storage Materials

The thermal transport properties of potential thermal energy storage materials have been measured using identical conditions enabling direct comparison.

scholarly journals The effect of 3D carbon nanoadditives on lithium hydroxide monohydrate based composite materials for highly efficient low temperature thermochemical heat storage

RSC Advances ◽  
2018 ◽  
Vol 8 (15) ◽  
pp. 8199-8208 ◽  
Author(s):  
Shijie Li ◽  
Hongyu Huang ◽  
Jun Li ◽  
Noriyuki Kobayashi ◽  
Yugo Osaka ◽  
...  
Keyword(s):  
Composite Materials ◽  
Low Temperature ◽  
Heat Storage ◽  
Lithium Hydroxide ◽  
Drift Spectroscopy ◽  
Highly Efficient ◽  
Lithium Hydroxide Monohydrate ◽  
Thermochemical Heat Storage ◽  
Hydroxide Monohydrate

3D carbon modified LiOH·H2O particles were well dispersed into nanoparticles (5–15 nm) and tested using in situ DRIFT spectroscopy.

scholarly journals Materials characterization of innovative composite materials for solar-driven thermochemical heat storage (THS) suitable for building application

2017 ◽  
Vol 14 (3) ◽  
pp. 313-325 ◽  
Author(s):  
Hasila Jarimi ◽  
Aydin Devrim ◽  
Yanan Zhang ◽  
Yate Ding ◽  
Omar Ramadan ◽  
...  
Keyword(s):  
Composite Materials ◽  
Silica Gel ◽  
Heat Storage ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
The Future ◽  
Thermochemical Heat Storage ◽  
Mixed Salts ◽  
Building Heat

Abstract Thermochemical Heat Storage (THS) systems have recently attracted a lot of attention in research and development. One of the main parameters that influence the performance of a THS system is the thermochemical materials. This paper aims to investigate thermochemical materials which are suitable for both short-term and long-term building heat storage application driven by solar energy for an open system. Innovative composite materials using MgCl2-MgSO4, CaCl2-LiCl and MgSO4- CaCl2 salts mixtures impregnated into vermiculite, and potassium formate (KCOOH) impregnated into silica gel will be presented in this study. Initial screening and characterization results of the composite THS materials based on the energy density using differential scanning calorimetry analysis, mass loss against temperature using thermo-gravimetric analysis, and moisture vapor adsorption isotherms testing are discussed. The characterization analysis suggest that the vermiculite with salts mixtures are promising candidates for thermochemical heat storage (THS) systems compared to composite materials with individual salts. Meanwhile the potential of KCOOH-silica gel as THS materials may be further investigated in the future. The performance of the materials may be further optimized in the future by changing the concentration ratio of the mixed salts.

scholarly journals Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

Entropy ◽  
2021 ◽  
Vol 23 (8) ◽  
pp. 953
Author(s):  
Tadagbe Roger Sylvanus Gbenou ◽  
Armand Fopah-Lele ◽  
Kejian Wang
Keyword(s):  
Mass Transfer ◽  
Simulation Study ◽  
Heat Storage ◽  
Storage Process ◽  
Efficient System ◽  
Mass Transfer Limitation ◽  
Thermochemical Heat Storage ◽  
Simulation Results ◽  
Materials Used ◽  
Storage Processes

Recent contributions to thermochemical heat storage (TCHS) technology have been reviewed and have revealed that there are four main branches whose mastery could significantly contribute to the field. These are the control of the processes to store or release heat, a perfect understanding and designing of the materials used for each storage process, the good sizing of the reactor, and the mastery of the whole system connected to design an efficient system. The above-mentioned fields constitute a very complex area of investigation, and most of the works focus on one of the branches to deepen their research. For this purpose, significant contributions have been and continue to be made. However, the technology is still not mature, and, up to now, no definitive, efficient, autonomous, practical, and commercial TCHS device is available. This paper highlights several issues that impede the maturity of the technology. These are the limited number of research works dedicated to the topic, the simulation results that are too illusory and impossible to implement in real prototypes, the incomplete analysis of the proposed works (simulation works without experimentation or experimentations without prior simulation study), and the endless problem of heat and mass transfer limitation. This paper provides insights and recommendations to better analyze and solve the problems that still challenge the technology.

scholarly journals Thermochemical Heat Storage in a Lab-Scale Indirectly Operated CaO/Ca(OH)2 Reactor—Numerical Modeling and Model Validation through Inverse Parameter Estimation

2021 ◽  
Vol 11 (2) ◽  
pp. 682
Author(s):  
Gabriele Seitz ◽  
Farid Mohammadi ◽  
Holger Class
Keyword(s):  
Numerical Model ◽  
Gas Flow ◽  
Reaction Rate ◽  
Heat Storage ◽  
Bulk Material ◽  
Fixed Bed ◽  
Experimental Results ◽  
Fixed Bed Reactor ◽  
Thermochemical Heat Storage ◽  
Speed Up

Calcium oxide/Calcium hydroxide can be utilized as a reaction system for thermochemical heat storage. It features a high storage capacity, is cheap, and does not involve major environmental concerns. Operationally, different fixed-bed reactor concepts can be distinguished; direct reactor are characterized by gas flow through the reactive bulk material, while in indirect reactors, the heat-carrying gas flow is separated from the bulk material. This study puts a focus on the indirectly operated fixed-bed reactor setup. The fluxes of the reaction fluid and the heat-carrying flow are decoupled in order to overcome limitations due to heat conduction in the reactive bulk material. The fixed bed represents a porous medium where Darcy-type flow conditions can be assumed. Here, a numerical model for such a reactor concept is presented, which has been implemented in the software DuMux. An attempt to calibrate and validate it with experimental results from the literature is discussed in detail. This allows for the identification of a deficient insulation of the experimental setup. Accordingly, heat-loss mechanisms are included in the model. However, it can be shown that heat losses alone are not sufficient to explain the experimental results. It is evident that another effect plays a role here. Using Bayesian inference, this effect is identified as the reaction rate decreasing with progressing conversion of reactive material. The calibrated model reveals that more heat is lost over the reactor surface than transported in the heat transfer channel, which causes a considerable speed-up of the discharge reaction. An observed deceleration of the reaction rate at progressed conversion is attributed to the presence of agglomerates of the bulk material in the fixed bed. This retardation is represented phenomenologically by mofifying the reaction kinetics. After the calibration, the model is validated with a second set of experimental results. To speed up the calculations for the calibration, the numerical model is replaced by a surrogate model based on Polynomial Chaos Expansion and Principal Component Analysis.

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