Advanced storage concepts for solar and low energy buildings, IEA-SHC Task 32
The focus on the Danish part of the IEA project SHC Task 32 Advanced Storage Concepts for Solar and Low Energy Buildings was on Subtask C: Storage Concepts Based on Phase Change Materials and on Subtask D: Storage Concepts Based on Advanced Water Tanks and Special Devices.
The project is the last two years of the Danish participation in the IEA Task 32 project 'Advanced storage concepts for solar and low energy buildings'. The Danish participation will be focused on Subtask C: Storage concepts based on phase change materials and Subtask D: Storage concepts based on advanced water tanks and special devices. In subtask C a laboratory test heat of fusion storage utilizing a stable super cooling of the heat storage material will be tested in the Department's heat storage test facility. Based on the investigations and on cost estimates the potential for heat of fusion storages for solar heating systems with a solar fraction of 100% for low energy buildings will be evaluated. In subtask D experiments are carried out with the aim to elucidate the durability of a new developed fabric inlet stratifier. Further, laboratory tests are carried out with a heat storage unit including an auxiliary energy supply system. The heat storage is equipped with a fabric inlet stratifier. Based on the investigations the potential for the fabric inlet stratifier is elucidated
In Subtask C a number of small scale experiments with heat and storages based on the salt hydrate sodium acetate trihydrate have been carreid out. The salt hydrate supercools in a stable way allowing long term heat storage with no heat loss. A small test heat of fusion storage was tested in a laboratory test facility. It is estimated that the practical problems related to the operation of heat of fusion storages making use of stable super cooling can be overcomed. Theoretical calculations showed that a solar heating system with a 6000 l heat of fusion storage utilizing stable super cooling can cover the heat demand of a low energy house completely, while a similar solar heating system with a traditional water storage is not able fully to cover the heat demand of the house. In Subtask D the advatages of water stores with new developed fabric inlet stratifiers have been investigated by means of experiments and calculations. The investigations showed that the thermal performance of solar heating systems with heat storages with advanced inlet stratifiers can be up to 15% higher than the thermal performance of solar heating systems with traditionally designed water stores
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Contact
Brovej bygn. 118
DK-2800 Kgs. Lyngby, Denmark
byg.dtu.dk
Furbo, Simon , 45251857, sf@byg.dtu.dk
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