Earth buffer storage

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Thermal storage tanks are called underground storage tanks and are buried in the ground to save space .

As with a conventional above-ground buffer , a heating system is understood to be a heat accumulator that is filled with liquid ( water , glycol , etc.). It is used to compensate for differences between the generated and consumed heat output. In this way, the system components for heat generation can be operated largely independently of consumption. This results in better operating behavior and better efficiency for many heat generators .

Underground storage tanks do not take up valuable space in the residential, commercial or industrial area and thus solve an important problem, since the space for heating technology is usually limited or should be used for other purposes. Long-term storage (seasonal storage) of heat , e.g. B. in solar thermal (solid fuel boiler) is no longer a problem. The storage tank becomes an important interface between the heat generators .

With conventional heat buffers, it is the continuous loss of heat that results from the temperature difference between the contents of the storage tank and the environment. This can be reduced by good thermal insulation and avoidance of thermal bridges . The rule of thumb for central heating systems is that a maximum of 60–70 liters of buffer storage volume should be provided for each installed kilowatt (kW) heating output.

The underground storage tank is provided with very efficient insulation that is also waterproof at the same time. The storage tank can be installed under the floor slab (factory, commercial or living space), next to the building or in driveways (with a dome cover that can be driven over if required).

There are pressureless underground storage tanks that need an external fresh water supply and are usually made of plastic or fiberglass. Also known are underground storage facilities with concrete rings. In 2007 a pressure-resistant variant was developed.