Simulation Study of a Novel Solar Thermal Seasonal Heat Storage System based on Stable Supercooled PCM for Space Heating and Domestic Hot Water Supply of Single Family Houses

Christoph Moser, Gerald Englmair, Hermann Schranzhofer, Andreas Heinz

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


A TRNSYS model of a novel PCM heat storage, utilizing stable supercooling of Sodium Acetate Trihydrate (SAT), is presented. To achieve high solar fractions in heat supply of single family houses, the necessary integration of big water volumes is challenging. To evaluate its functionality, a system model of a solar thermal combisystem for space heating and domestic hot water supply for dynamic system simulation was built. The key component is a PCM volume for
long term heat storage. While conventional heat storage concepts with SAT release the latent heat a few degrees below the melting temperature, with the concept of stable supercooling latent heat can be stored for long periods of time at ambient temperature. This allows the design of a partly lossfree
storage. Solar fractions were evaluated for simulation runs with two building variations. Annual specific space heating demands of 15 and 30 kWh.m-2.a-1) and a domestic hot water demand of a typical single family house were considered. A sensitivity analysis on solar fractions of domestic
heat supply was performed by variation of the collector field and the PCM volume. While the increase of the PCM volume from 4.5 m3 to 9 m3 shows moderate effects in all simulation runs, an
increase of the collector area has substantial effects on the share of solar heat on the total energy demand of the building.
Translated title of the contributionSimulationsstudie eines neuartigen solarthermischen saisonalen Wärmespeicher Systems auf Basis von stabilem unterkühltem PCM für Raumheizung und Warmwasserversorgung von Einfamilienhäusern
Original languageEnglish
Title of host publicationProceedings EnviBUILD 2017
Number of pages8
Publication statusPublished - 25 Jan 2019
EventenviBuild 2017 - Technische Universitä Wien, Wien, Austria
Duration: 7 Sept 20178 Sept 2017


ConferenceenviBuild 2017
Abbreviated titleenviBuild 2017
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