In-depth investigation of thermochemical performance in a heat battery: Cyclic analysis of K2CO3, MgCl2 and Na2S

L. C. Sögütoglu; P.A.J. Donkers; H.R. Fischer; H.P. Huinink; O.C.G. Adan

doi:10.1016/j.apenergy.2018.01.083

In-depth investigation of thermochemical performance in a heat battery: Cyclic analysis of K₂CO₃, MgCl₂ and Na₂S

L. C. Sögütoglu
, P.A.J. Donkers
, H.R. Fischer
, H.P. Huinink
, O.C.G. Adan

Research output: Contribution to journal › Article › Academic › peer-review

125 Citations (Scopus)

1706 Downloads (Pure)

Abstract

Thermochemical materials K₂CO₃, MgCl₂ and Na₂S have been investigated in depth on energy density, power output and chemical stability in view of domestic heat storage application, presenting a critical assessment of potential chemical side reactions in an open and closed reactor concept. These materials were selected based on a recent review on all possible salt hydrates, within the frame of a thermochemical heat battery and considering recent advances in heat storage application. Judged by gravimetric and calorimetric experiments in operating conditions and worst-case-scenario conditions, K₂CO₃ is recommended for both an open and closed system heat battery. The compound is chemically robust with a material level energy density of 1.28 GJ/m³ in an open system and 0.95 GJ/m³ in a closed system, yielding a power output of 283–675 kW/m³. Na₂S and MgCl₂ on the other hand are chemically not robust in heat storage application, although having a higher energy density, output power and temperature in one cycle.

Original language	English
Pages (from-to)	159-173
Number of pages	15
Journal	Applied Energy
Volume	215
DOIs	https://doi.org/10.1016/j.apenergy.2018.01.083
Publication status	Published - 1 Apr 2018

Funding

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 680450 . This work reflects only the author’s view. The European Commission is not responsible for any use that may be made of this information. We thank Dr. A. Anastasopol for supplying recrystallised Na 2 S·5 H 2 O and J. Houben for his help in building the pressure temperature set-up.

Keywords

Chemical stability
Energy density
Enthalpy of hydration
Phase diagram
Salt hydrates
Side reactions
Thermo chemical heat storage

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10.1016/j.apenergy.2018.01.083

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Cite this

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title = "In-depth investigation of thermochemical performance in a heat battery: Cyclic analysis of K2CO3, MgCl2 and Na2S",

abstract = "Thermochemical materials K2CO3, MgCl2 and Na2S have been investigated in depth on energy density, power output and chemical stability in view of domestic heat storage application, presenting a critical assessment of potential chemical side reactions in an open and closed reactor concept. These materials were selected based on a recent review on all possible salt hydrates, within the frame of a thermochemical heat battery and considering recent advances in heat storage application. Judged by gravimetric and calorimetric experiments in operating conditions and worst-case-scenario conditions, K2CO3 is recommended for both an open and closed system heat battery. The compound is chemically robust with a material level energy density of 1.28 GJ/m3 in an open system and 0.95 GJ/m3 in a closed system, yielding a power output of 283–675 kW/m3. Na2S and MgCl2 on the other hand are chemically not robust in heat storage application, although having a higher energy density, output power and temperature in one cycle.",

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AU - Huinink, H.P.

AU - Adan, O.C.G.

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AB - Thermochemical materials K2CO3, MgCl2 and Na2S have been investigated in depth on energy density, power output and chemical stability in view of domestic heat storage application, presenting a critical assessment of potential chemical side reactions in an open and closed reactor concept. These materials were selected based on a recent review on all possible salt hydrates, within the frame of a thermochemical heat battery and considering recent advances in heat storage application. Judged by gravimetric and calorimetric experiments in operating conditions and worst-case-scenario conditions, K2CO3 is recommended for both an open and closed system heat battery. The compound is chemically robust with a material level energy density of 1.28 GJ/m3 in an open system and 0.95 GJ/m3 in a closed system, yielding a power output of 283–675 kW/m3. Na2S and MgCl2 on the other hand are chemically not robust in heat storage application, although having a higher energy density, output power and temperature in one cycle.

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