The SGL Group has developed a heat storage system in response to industrial companies’ growing demands for optimal heat and energy utilisation. A module can store up to 3 MWh of heat energy, which equates to roughly the same amount of energy consumed by a private two-person household per year and achieves a charge and discharge power of 1 MW. The SGL system can store process heat at a temperature level of 100 to 350 °C and reuse it at a later time. The heat recovery rate is usually over 90 %. The system is primarily suited for discontinuous processes; the more charges and discharges a day, the more efficient the system. The rapid charge and discharge times enable up to 12 cycles a day. Carbon also makes the difference here and generates considerably higher energy yields and thus cost savings for the user, e.g. in the process industry and in solar-thermal and cogeneration power plants.
The storage of the heat energy is achieved by using so-called phase-change materials (PCM). These are salts capable of absorbing and releasing large amounts of heat at melting point without changing in terms of temperature. The battery contains a special carbon structure, which ensures that the heat transfer occurs 100 times faster than with
a pure PCM material.
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