Fr. ladies with haloes

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Possible Answers: STES.

Random information on the term “STES”:

Seasonal thermal energy storage (or STES) is the common umbrella term for several technologies for storing heat or cold for periods of up to several months. The thermal energy can be collected whenever it is available and be used whenever needed, such as in the opposing season. For example, heat from solar collectors or waste heat from air conditioning equipment can be gathered in hot months for space heating use when needed, including during winter months. Waste heat from industrial process can similarly be stored and be used much later.[1] Or the natural cold of winter air can be stored for summertime air conditioning.[2][3] STES stores can serve district heating systems, as well as single buildings or complexes. Among seasonal storages used for heating, the design peak annual temperatures generally are in the range of 27 to 80 °C (80.6 to 176.0 °F), and the temperature difference occurring in the storage over the course of a year can be several tens of degrees. Some systems use a heat pump to help charge and discharge the storage during part or all of the cycle. For cooling applications, often only circulation pumps are used. A less common term for STES technologies is interseasonal thermal energy storage[4]
Taken from Wikipedia