Abstract
In this paper, a simulations model of a seasonal thermal energy storage (TES) reactor integrated into a house heating system is presented. The water vapour chemisorbing reactor contains a composite material composed of silica gel and hydrated magnesium carbonate (nesquehonite, MgCO3·3H2O) that can be produced by a carbon capture and storage by mineralisation process. The performance of the TES to supply winter heat instead of electrical resistance heat is analysed. Dividing the reactor into a few units (connected in series) for better heat output and storage capacity as developed by the authors is compared to one unit or parallel unit solutions. The heating system components are an exhaust air heat pump, solar collectors and a heat recovery ventilation unit (HRV). The TES is used as heat source during colder periods, which implies improved efficiency and coefficient of performance (COP). Around 70% of electrical resistance heat, assisting an exhaust air heat pump during cold periods, can be substituted with heat from the TES according to the simulation model. Connecting three units in series will increase the usable storage capacity possibilities with by a 49% higher heat output.
Highlights
All technically and economically viable types of renewable energy and carbon capture and storage (CCS) technologies are necessary measures to reach the goals of the 2015 Paris climate agreement on reduced CO2 emissions
3simulations until later and drier periods of theand winter heating system performed for a one-year
To examine the applicability of the seasonal heat storage by chemisorption, simulations of the heating system were performed for a one-year period
Summary
All technically and economically viable types of renewable energy and carbon capture and storage (CCS) technologies are necessary measures to reach the goals of the 2015 Paris climate agreement on reduced CO2 emissions. The availability of renewable energy sources often fluctuates and solar heat largely exceeds the heating demand during summer, while the major demand for heat is during winter. Solving this problem requires seasonal energy storage, for example for heat in the form of thermal energy storage (TES), within affordable volume boundaries. In more densely built areas, the storage volume can be an issue and using chemical sorption reaction based seasonal storage would require smaller volumes, with larger energy density compared to sensible heat storage. Simulations of a novel type of TES heating concept are presented using laboratory data from our earlier studies. The material used in the seasonal thermal energy storage (STES)
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