Analysis of Energy Storage Capabilities in Hydrated Sodium Acetate Using the Phase Transitions of the First Kind

Robert Szczepaniak , Grzegorz Woroniak , Radosław Rudzki

Abstract

Heat demand take a large part of energy use in the buildings. The amount of Solar energy is much higher in summer and exceeds heating demands. That is why thermal energy storage technologies are needed to cover the energy supply for winter cold months. Currently available thermal energy storage systems, using water for short-term storage, work well, but it is not enough. For longer storage periods, different technologies are needed. Phase Change Materials (PCM) in the latent heat storage has been taken into account as an energy storage in RES technologies. An example of such a material is sodium acetate CH3COOHNa, which in room temperature is a solid body, and after exceeding the phase transition temperature (TPF ≅ 55 ℃), it turns into a liquid. The substance, when in a liquid state, characterizes with its ability to change into a supercooling state, until it reaches the temperature nearing 0 ℃. It is possible to initiate the process of a phase transition while CH3COOHNa is in the state of undercooling (0 °C ≤ T ≤ 55 °C) by switching on an acoustic generator (20 kHz). The phase transition that has been initiated in this way can be observed through crystallizing the substance, which was used as a specimen; and it indicates a phase transition of the first kind, during which huge amounts of latent heat are released. Therefore, the occurring amorphous substance transition is an exothermic process
Author Robert Szczepaniak
Robert Szczepaniak,,
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, Grzegorz Woroniak (FCEE / HVAC)
Grzegorz Woroniak,,
- Heating, Ventilation, Air Conditioning Department (HVAC Department)
, Radosław Rudzki
Radosław Rudzki,,
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Pages1043-1055
Publication size in sheets0.6
Book Wróbel Marek, Jewiarz Marcin, Szlek Andrzej (eds.): Renewable Energy Sources: Engineering, Technology, Innovation , 2020, Springer, ISBN 978-3-030-13887-5, [978-3-030-13888-2], 1094 p., DOI:10.1007/978-3-030-13888-2
Keywords in EnglishPhase transitions Hydrate sodium acetate Latent heat Energy storage
Internal identifierROC 19-20
Languageen angielski
Score (nominal)20
Score sourcepublisherList
ScoreMinisterial score = 20.0, 22-01-2020, ChapterFromConference
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