Characterization of potassium carbonate salt hydrate for thermochemical energy storage in buildings

Mohammadreza Gaeini (Corresponding author), S.A. Shaik, Camilo Rindt

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Abstract

Thermochemical heat storage in salt hydrates is a promising method to improve the solar fraction in the built environment. One of the most promising salt hydrates to be used as thermochemical material is potassium carbonate. In this study, the use of potassium carbonate in heat storage applications is investigated experimentally. The most important objective is to form a kinetic model for the de/re-hydration reaction of the material. In order to do so, it is crucial to understand the behavior of the salt when it reacts with water vapor. Reaction kinetics and mechanism are investigated for K2CO3, as one of the most promising materials. Characterization of the materials is carried out with combined Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods. By employing the experimental results, kinetics models are developed for the hydration and dehydration reactions of the material. The kinetics model can be further used to predict the performance of a heat storage system working with K2CO3. In addition, cyclability and reaction enthalpy are investigated.
Original languageEnglish
Pages (from-to)178-193
Number of pages16
JournalEnergy and Buildings
Volume196
DOIs
Publication statusPublished - 1 Aug 2019

Fingerprint

Potash
Hydrates
Energy storage
Heat storage
Salts
Hydration
Kinetics
Dehydration
Reaction kinetics
Water vapor
Thermogravimetric analysis
Differential scanning calorimetry
Enthalpy

Keywords

  • Thermochemical heat storage
  • Potassium carbonate
  • TGA-DSC
  • Kinetics
  • Energy storage density
  • Reaction model

Cite this

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title = "Characterization of potassium carbonate salt hydrate for thermochemical energy storage in buildings",
abstract = "Thermochemical heat storage in salt hydrates is a promising method to improve the solar fraction in the built environment. One of the most promising salt hydrates to be used as thermochemical material is potassium carbonate. In this study, the use of potassium carbonate in heat storage applications is investigated experimentally. The most important objective is to form a kinetic model for the de/re-hydration reaction of the material. In order to do so, it is crucial to understand the behavior of the salt when it reacts with water vapor. Reaction kinetics and mechanism are investigated for K2CO3, as one of the most promising materials. Characterization of the materials is carried out with combined Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods. By employing the experimental results, kinetics models are developed for the hydration and dehydration reactions of the material. The kinetics model can be further used to predict the performance of a heat storage system working with K2CO3. In addition, cyclability and reaction enthalpy are investigated.",
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Characterization of potassium carbonate salt hydrate for thermochemical energy storage in buildings. / Gaeini, Mohammadreza (Corresponding author); Shaik, S.A.; Rindt, Camilo.

In: Energy and Buildings, Vol. 196, 01.08.2019, p. 178-193.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Characterization of potassium carbonate salt hydrate for thermochemical energy storage in buildings

AU - Gaeini, Mohammadreza

AU - Shaik, S.A.

AU - Rindt, Camilo

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N2 - Thermochemical heat storage in salt hydrates is a promising method to improve the solar fraction in the built environment. One of the most promising salt hydrates to be used as thermochemical material is potassium carbonate. In this study, the use of potassium carbonate in heat storage applications is investigated experimentally. The most important objective is to form a kinetic model for the de/re-hydration reaction of the material. In order to do so, it is crucial to understand the behavior of the salt when it reacts with water vapor. Reaction kinetics and mechanism are investigated for K2CO3, as one of the most promising materials. Characterization of the materials is carried out with combined Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods. By employing the experimental results, kinetics models are developed for the hydration and dehydration reactions of the material. The kinetics model can be further used to predict the performance of a heat storage system working with K2CO3. In addition, cyclability and reaction enthalpy are investigated.

AB - Thermochemical heat storage in salt hydrates is a promising method to improve the solar fraction in the built environment. One of the most promising salt hydrates to be used as thermochemical material is potassium carbonate. In this study, the use of potassium carbonate in heat storage applications is investigated experimentally. The most important objective is to form a kinetic model for the de/re-hydration reaction of the material. In order to do so, it is crucial to understand the behavior of the salt when it reacts with water vapor. Reaction kinetics and mechanism are investigated for K2CO3, as one of the most promising materials. Characterization of the materials is carried out with combined Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods. By employing the experimental results, kinetics models are developed for the hydration and dehydration reactions of the material. The kinetics model can be further used to predict the performance of a heat storage system working with K2CO3. In addition, cyclability and reaction enthalpy are investigated.

KW - Thermochemical heat storage

KW - Potassium carbonate

KW - TGA-DSC

KW - Kinetics

KW - Energy storage density

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