Nucleation of sodium acetate trihydrate in thermal heat storage cycles

Guion, J.; Teisseire, M.

doi:10.1016/0038-092x(91)90021-n

Cited by 22 publications

(10 citation statements)

References 19 publications

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“…In fact, the supercooling of a PCM in a latent heat storage has usually been seen as an undesirable effect that needs be avoided by using various nucleation agents. This is because it prevents the heat of fusion from being released as desired during the discharge process when the melting point of the PCM is reached [15]. However, when a PCM is in a supercooled state in temperature equilibrium with the ambient, the melting enthalpy of the PCM is stored, but no continuous heat loss occurs, which makes long-term heat storage possible.…”

Section: Phase Change Materials Heat Storagementioning

confidence: 99%

Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures

et al. 2016

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Section: Phase Change Materials Heat Storagementioning

confidence: 99%

Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures

et al. 2016

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“…On the other hand, the cooling down of liquid material to temperatures substantially below its melting temperature is considered to hinder the conventional use of PCMs for thermal energy storage [25], [26]. Ways of reducing the supercooling of SAT have therefore been investigated [27], [28].…”

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confidence: 99%

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

et al. 2018

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Document Version Peer reviewed versionLink back to DTU Orbit Citation (APA): Englmair, G., Moser, C., Furbo, S., Dannemand, M., & Fan, J. (2018). Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system. Applied Energy, 221, 522-534. https://doi. Highlights Combined short-and long-term heat-storage prototype for domestic solar heating  Interplay of solar collectors, four 200 kg PCM units and a 735 L water tank  Functionality of a segmented heat storage utilizing stable supercooling of SAT  Solidification of supercooled SAT was started by a seed crystal injection device  Supply temperatures and thermal power during PCM charge and discharge were evaluated Abstract A solar heating system with 22.4 m² of solar collectors, a heat storage prototype consisting of four 200 kg phase-change material (PCM) storage units, and a 735 L water tank was designed to improve solar heat supply in single-family houses. The PCM storage utilized stable supercooling of sodium acetate trihydrate composites to conserve the latent heat of fusion for long-term heat storage. A control strategy directed heat from a solar collector array to either the PCM storage or a water buffer storage. Several PCM units had to be charged in parallel when the solar collector output peaked at 16 kW. A single unit was charged with 27.4 kWh of heat within four hours on a sunny day, and the PCM temperature increased from 20 ºC to 80 ºC. The sensible heat from a single PCM unit was transferred to the water tankstarting with about 32 kW of thermal power after it had fully melted at 80 ºC. A mechanical seed crystal injection device was used to initialize the crystallisation of the sodium acetate trihydrate after it had supercooled to room temperature. The unit discharge during solidification peaked at 8 kW. Reliable supercooling was achieved in three of the four units. About 80% of latent heat of fusion was transferred from PCM units after solidification of supercooled sodium acetate trihydrate to the water tank within 5 hours. Functionality tests with practical operation conditions on the novel, modular heat-storage configuration showed its applicability for domestic hot water supply and space heating. Keywords: Solar heating system; heat storage prototype; phase change material; sodium acetate trihydrate; stable supercooling. P pump PCM phase-change material SA sodium acetate SAT sodium acetate trihydrate SH space heating V 2-way valve

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“…In most latent heat storage applications, this phenomenon is unwanted [6], [21]. Measures have even been developed to deliver nucleation centres in order to reduce the supercooling of SAT [22], [23]. Nevertheless, for long-term heat storage, the utilization of supercooled salt hydrates has been studied since the late 1920s [24].…”

Section: Supercooling Stabilitymentioning

confidence: 99%

Crystallization by local cooling of supercooled sodium acetate trihydrate composites for long-term heat storage

Englmair

Jiang

Dannemand

et al. 2018

Energy and Buildings

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Nucleation of sodium acetate trihydrate in thermal heat storage cycles

Cited by 22 publications

References 19 publications

Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures

Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

Crystallization by local cooling of supercooled sodium acetate trihydrate composites for long-term heat storage

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