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Galactitol as phase change material for latent heat storage of solar cookers : Investigating thermal behavior in bulk cycling

Titelangaben

John, Geoffrey ; König-Haagen, Andreas ; King’ondu, Cecil K. ; Brüggemann, Dieter ; NKhonjera, Lameck:
Galactitol as phase change material for latent heat storage of solar cookers : Investigating thermal behavior in bulk cycling.
In: Solar Energy. Bd. 119 (2015) . - S. 415-421.
ISSN 0038-092X
DOI: https://doi.org/10.1016/j.solener.2015.07.003

Angaben zu Projekten

Projektfinanzierung: Deutscher Akademischer Austauschdienst

Abstract

Galactitol, in terms of its phase change enthalpy and temperature, is a promising phase change material (PCM) for medium temperature (150–200 °C) latent heat storage of solar cookers. This study aimed at determining the effect of upper cycle temperature on thermal behavior of galactitol in bulk thermal cycling. Three bulk samples were repetitively melted and frozen with each sample having fixed upper cycle temperature different from the others. Temperature histories of the samples were recorded whereas phase change enthalpies and specific heat capacities were obtained by differential scanning calorimetry. Thermal diffusivities of fresh galactitol within a range of 20–240 °C were determined by a flash diffusivity instrument. The results show that the upper cycle temperature has a great influence on the attainable number of melting and freezing cycles, the degree of subcooling, the rate of change of degree of subcooling as well as the phase change enthalpy and temperature. The upper cycle temperatures above but close to the melting temperature are favorable. The lowest upper cycle temperature was around 200 °C and yielded about 90 thermal cycles feasible for solar cooking at temperatures greater than 150 °C. Therefore, galactitol as a PCM in thermal energy storage of solar cookers that are thermally cycled at least once a day, can afford a lifespan of less than 100 days, which is far lower than lifespans of the other parts of the cooker system. Galactitol was thus found to be unstable and with a too short lifespan for practical application as PCM for medium temperature thermal energy storage purposes.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Galactitol; Subcooling; Latent heat storage; Solar cookers
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Technische Thermodynamik und Transportprozesse
Profilfelder > Emerging Fields > Energieforschung und Energietechnologie
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Profilfelder
Profilfelder > Emerging Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 01 Mär 2019 08:08
Letzte Änderung: 11 Mai 2020 06:37
URI: https://eref.uni-bayreuth.de/id/eprint/45898