Heat of Fusion Storage with High Solar Fraction for Solar Low Energy Buildings

Jørgen Munthe Schultz, Simon Furbo

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This paper presents the theoretical investigation on a concept for a seasonal thermal storage based on the phase change material sodium acetate trihydrate with active use of supercooling as a measure to achieve a partly heat loss free thermal storage. The effect of supercooling allows a melted part of the storage to cool down below the melting point without solidification preserving the heat of fusion energy. If the supercooled storage reaches the surrounding temperature no heat loss will take place until the supercooled salt is activated. The investigation shows that this concept makes it possible to achieve 100% coverage of space heating and domestic hot water in a low energy house in a Danish climate with a solar heating system with 36 m² flat plate solar collector and approximately 10 m³ storage with sodium acetate. A traditional water storage solution aiming at 100% coverage will require a storage volume several times larger.
Original languageEnglish
Title of host publicationEurosun 2006 : Conference proceedings
PublisherThe Solar Energy Society
Publication date2006
ISBN (Print)09-04-96373-1
Publication statusPublished - 2006
EventEuroSun 2006 - Glasgow, United Kingdom
Duration: 27 Jun 200630 Jun 2006
Conference number: 6


ConferenceEuroSun 2006
CountryUnited Kingdom
OtherPart of International Renewable Energy Conference and Trade Exhibition
Internet address

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Schultz, J. M., & Furbo, S. (2006). Heat of Fusion Storage with High Solar Fraction for Solar Low Energy Buildings. In Eurosun 2006: Conference proceedings The Solar Energy Society.