Ratiotherm Smart Energy Systems aims to use environmental energy in combination with various energy sources.
Regarding the efficiency of sensible thermal storage, there are strong issues on the performances of thermal storage. This consists in safeguarding the smallest thermal stratification zone within the tank. To do so, it is necessary to have a strong variation in temperature between the two ends of storage to obtain thermal storage of quality. In particular between the top and the bottom of the thermal device of storage considered in driving position.
To preserve the quality of storage and thus this heat gradient, it is necessary to distribute (namely inject and/or tap) coolant without introducing convective movements. Indeed, these are the responsible for the thermal de-stratification. If the temperatures of injection are not constant, it is also necessary to inject the fluid at a temperature given within a layer of adequate temperature. This procedure aims to avoid a mixture of the fluid stored in the tank of the device of storage.
Simple methods, like the fixed injection one, proved to be interesting when the inlet temperatures are constant and that the flow is low. However, it generates a stratification of poor quality.
There exists also the principle of injection known as of the “cane of stratification” which allows energy distribution by natural convection. More precisely, the fluid goes up inside a tube thermo-syphon (stratification canes) with bored holes for the injection of fluid in the tank. By the difference in density, the fluid circulates in the cane of stratification until reaching the height of the of the same layer temperature.
The Ratiotherm company, in particular under the reference Oskar (®) proposes such stratification systems. Thus, various drains come to be grafted with the cane of stratification in the form of spiral and openings.