Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate

Mark Dannemand; Weiqiang Kong; Jianhua Fan; Jakob Berg Johansen; Simon Furbo

doi:10.1016/j.egypro.2015.02.113

Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate

Mark Dannemand, Weiqiang Kong, Jianhua Fan, Jakob Berg Johansen, Simon Furbo

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Abstract

Laboratory test of a long term heat storage module utilizing the principle of stable supercooling of 199.5 kg of sodium acetate water mixture has been carried out. Avoiding phase separation of the incongruently melting salt hydrate by using the extra water principle increased the heat storage capacity. An external expansion vessel minimized the pressure built up in the module while heating and reduced the risk of instable supercooling. The module was stable supercooled at indoor ambient temperature for up to two months after which it was discharged. The energy discharged after activating the supercooled sodium acetate water mixture was 194 kJ/kg of sodium acetate water mixture in the first test cycles dropping to 179 kJ/kg in the later test cycles. Instability of the supercooling occurred when the charging periods were short and in the last test cycles where the tube connecting the module to the expansion vessel had been blocked by the salt hydrate.

Original language	English
Journal	Energy Procedia
Volume	70
Pages (from-to)	172-181
ISSN	1876-6102
DOIs	https://doi.org/10.1016/j.egypro.2015.02.113
Publication status	Published - 2015
Event	3rd International Conference on Solar Heating and Cooling for Buildings and Industry - China National Convention Center, Beijing, China Duration: 13 Oct 2014 → 15 Oct 2014 Conference number: 3 http://www.shc2014.org/cms/home.html

Conference

Conference	3rd International Conference on Solar Heating and Cooling for Buildings and Industry
Number	3
Location	China National Convention Center
Country/Territory	China
City	Beijing
Period	13/10/2014 → 15/10/2014
Internet address	http://www.shc2014.org/cms/home.html

Bibliographical note

Keywords

Seasonal heat storage
Sodium acetete trihydrate
Supercooling
Prototype testing
Thermal energy storage

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10.1016/j.egypro.2015.02.113

SHC2014 paper dannemand final v2Final published version, 514 KB
Laboratory test of a prototypeFinal published version, 805 KB

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@inproceedings{69864c82d0ab48c987d77d9c6e66ea65,

title = "Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate",

abstract = "Laboratory test of a long term heat storage module utilizing the principle of stable supercooling of 199.5 kg of sodium acetate water mixture has been carried out. Avoiding phase separation of the incongruently melting salt hydrate by using the extra water principle increased the heat storage capacity. An external expansion vessel minimized the pressure built up in the module while heating and reduced the risk of instable supercooling. The module was stable supercooled at indoor ambient temperature for up to two months after which it was discharged. The energy discharged after activating the supercooled sodium acetate water mixture was 194 kJ/kg of sodium acetate water mixture in the first test cycles dropping to 179 kJ/kg in the later test cycles. Instability of the supercooling occurred when the charging periods were short and in the last test cycles where the tube connecting the module to the expansion vessel had been blocked by the salt hydrate.",

keywords = "Seasonal heat storage, Sodium acetete trihydrate, Supercooling, Prototype testing, Thermal energy storage",

author = "Mark Dannemand and Weiqiang Kong and Jianhua Fan and Johansen, {Jakob Berg} and Simon Furbo",

note = "{\textcopyright} 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license; 3rd International Conference on Solar Heating and Cooling for Buildings and Industry, SHC 2014 ; Conference date: 13-10-2014 Through 15-10-2014",

year = "2015",

doi = "10.1016/j.egypro.2015.02.113",

language = "English",

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TY - GEN

T1 - Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate

AU - Dannemand, Mark

AU - Kong, Weiqiang

AU - Fan, Jianhua

AU - Johansen, Jakob Berg

AU - Furbo, Simon

N1 - Conference code: 3

PY - 2015

Y1 - 2015

N2 - Laboratory test of a long term heat storage module utilizing the principle of stable supercooling of 199.5 kg of sodium acetate water mixture has been carried out. Avoiding phase separation of the incongruently melting salt hydrate by using the extra water principle increased the heat storage capacity. An external expansion vessel minimized the pressure built up in the module while heating and reduced the risk of instable supercooling. The module was stable supercooled at indoor ambient temperature for up to two months after which it was discharged. The energy discharged after activating the supercooled sodium acetate water mixture was 194 kJ/kg of sodium acetate water mixture in the first test cycles dropping to 179 kJ/kg in the later test cycles. Instability of the supercooling occurred when the charging periods were short and in the last test cycles where the tube connecting the module to the expansion vessel had been blocked by the salt hydrate.

AB - Laboratory test of a long term heat storage module utilizing the principle of stable supercooling of 199.5 kg of sodium acetate water mixture has been carried out. Avoiding phase separation of the incongruently melting salt hydrate by using the extra water principle increased the heat storage capacity. An external expansion vessel minimized the pressure built up in the module while heating and reduced the risk of instable supercooling. The module was stable supercooled at indoor ambient temperature for up to two months after which it was discharged. The energy discharged after activating the supercooled sodium acetate water mixture was 194 kJ/kg of sodium acetate water mixture in the first test cycles dropping to 179 kJ/kg in the later test cycles. Instability of the supercooling occurred when the charging periods were short and in the last test cycles where the tube connecting the module to the expansion vessel had been blocked by the salt hydrate.

KW - Seasonal heat storage

KW - Sodium acetete trihydrate

KW - Supercooling

KW - Prototype testing

KW - Thermal energy storage

U2 - 10.1016/j.egypro.2015.02.113

DO - 10.1016/j.egypro.2015.02.113

M3 - Conference article

SN - 1876-6102

VL - 70

SP - 172

EP - 181

JO - Energy Procedia

JF - Energy Procedia

T2 - 3rd International Conference on Solar Heating and Cooling for Buildings and Industry

Y2 - 13 October 2014 through 15 October 2014

ER -

Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate

Abstract

Conference

Bibliographical note

Keywords

Access to Document

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Cite this