METHOD FOR CHARGING AND DISCHARGING A HEAT ACCUMULATOR AND SYSTEM FOR STORING AND RELEASING THERMAL ENERGY SUITABLE FOR SAID METHOD

摘要

The invention relates to a method for charging and discharging a heat accumulator (11) in a charge cycle (13) and in a discharge cycle (14). According to the invention, the discharging takes place by means of a steam turbine (23) which has a high-pressure part (HP) and a low-pressure part (LP). In order to provide heat to both turbine parts, according to the invention the heat accumulator (11) is divided into a part-accumulator (20) for the high-pressure part (HP) and a part-accumulator (21) for the low-pressure part (LP) (this division need not be structural). Furthermore, the invention relates to a system in which the heat accumulator (11) is divided into two part-accumulators (20, 21). By operating a turbine with the high-pressure part (HP) and low-pressure part (LP), the advantageous result is achieved that the efficiency and yield of heat from the heat accumulator (11) can be advantageously increased. The system can, for example, be used to temporarily store surplus capacities of a wind plant (16).