Advanced storage concepts for solar thermal systems in low energy buildings
The aim of the project was in an international cooperation to develop new/advanced heat storage types suitable as long term heat storages for solar heating systems. The project is the Danish part of the IEA Task 32 project 'Advanced storage concepts for solar thermal systems in low energy buildings'.
The aim of the project is - in an international cooperation - to develop new/advanced heat storage types suitable as longterm heat storages for solar heating systems. The project is the Danish part of the IEA project 'Advanced storage concepts for solar thermal systems in low energy buildings' in the period 2003-2005. The Danish project includes: 1) A state of the art will be worked out for heat storage principles used for long-term heat storage. Advanced water tanks, PCM (Phase Change Materials) heat storages and heat storages based on chemical reactions will be included. 2) Investigations will be carried out on heat of fusion storages with small heat losses based on a mixture of NaCH3COO·3H20 and xanthane rubber. 3) An advanced heat storage unit with a built-in auxiliary energy supply system will be developed. An advanced control system resulting in a good interplay between the solar collectors and the auxiliary energy supply system, stratification inlet pipes and pipes and valves resulting in a good thermal stratification in the heat storage, both during charge and discharge, will be used. The results will be presented in journals and at a meeting. The developed advanced heat storage unit can be marketed
The aim of the project was in an international cooperation to develop new/advanced heat storage types suitable as long term heat storages for solar heating systems. The project is the Danish part of the IEA Task 32 project 'Advanced storage concepts for solar thermal systems in low energy buildings'. The Danish project period was 2003-2005, while the period for the IEA Task 32 project is 2003-2007. The Danish project bas been focused on: 1) Contibution to a state of the art report for heat storage principles used for long term heat storage. 2) Theoretical and experimental investigations of heat of fusion storages utilizing a stable super cooling. It has been elucidated that solar heating systems with such heat stores fully can cover the heat demand in low energy buildings. 3) Theoretical and experimental investigations of advanced water stores. Different typs of stores have been included in the investigations. The thermal advantages by different ways to atablish and maintain thermal stratification in the heat storages have been elucidated. Differently designed inlet stratifiers havebeen investigated by means of exprimental investigations. Among other things, the suitability of a promising new developed multi layer fabric inlet stratifer has been elucidated
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