Thermal energy storage is a common strategy in energy production systems in which the period of production does not coincide with that of consumption. This happens with the production of hot water by means of solar thermal panels, for example; here, hot water is produced during sunlight hours when demand is lower. It is also the case in residential cogeneration, where heat and electrical power are simultaneously generated but not so demand. In both cases, storing the heat allows production to be decoupled from demand, thus making the integration of these technologies into buildings more flexible. Here, it is normal for periods of energy production not to coincide with those when it is consumed.
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