Experience and outlook on the thermo chemical storage system based on aqueous sodium hydroxide
- Conference Paper
Application limitations for solar heating are overcome by greatly improving heat storage. Adequate heat storage is achieved by reducing the time dependent thermal losses, reducing storage volume and allowing storage geometries to easily adjust. To this purpose much work has been done at Empa on a laboratory scale proof of concept of a closed sorption heat storage. This work has provided valuable insight into the potential as well as the challenges and limitations of this technology for the application as heat storage. The closed sorption heat storage concept is based on a continuous, but not full cycle, liquid state absorption heat pump. Heat is not directly stored, instead the potential to regain heat at a desired temperature from a low temperature thermal input is stored. The markable benefit in this is undoubtedly the time independent energy losses. Losses are encountered in the conversion processes during charging as well as discharging but not during storage time. For this reason there is great potential in the application of the closed sorption heat storage as a long term solar heat storage. Due to the losses during the conversion process the closed sorption heat storage is less suitable for short term heat storage. Therefore for a 100 % solar heated home a hybrid system is proposed. This hybrid system contains a hot water storage for short to intermediate term storage and a closed sorption heat storage for seasonal storage. In the scope of the EU funded project COMTES a prototype system based on the working pair aqueous sodium hydroxide is under construction. The system is dimensioned to cover space heating as well as domestic hot water in a single family house in Zurich, built to passive energy standards. The two major challenges in the system design are: keeping the system volume favourable and keeping the parasitic electric energy consumption at a minimum. Show more
Book titleCISBAT 2013: Proceedings Vol. II. - Cleantech for Smart Cities & Buildings from Nano to Urban Scale
Pages / Article No.
PublisherEPFL, Solar Energy and Building Physics Laboratory
SubjectLongterm thermal storage; Thermo-chemical material; Sodium hydroxide; Absorption heat pump; Closed sorption heat storage
Organisational unit03806 - Carmeliet, Jan / Carmeliet, Jan
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Is part of: https://doi.org/10.5075/epfl-infoscience-190601
NotesPoster presented on 4 September 2013.
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