Because the energy required for people has a strong time and spatiality, in order to reasonably use energy and improve the utilization rate of energy, a device needs to be used. Get up, use it at the peak, or use it to be used to the place where energy is scarce. This method is energy storage.
The basic task of the energy storage system is to overcome the time or locality between energy supply and demand. There are two cases of this difference. One is caused by sudden changes in energy demand, that is, there is a peak load problem. The use of energy storage methods can adjust or buffer when the load change rate is increased. Because the investment cost of an energy storage system is relatively lower than the construction of a peak load factory, although the energy storage device will have storage loss, because the energy stored energy is from excess energy or new energy from the factory, it can still reduce fuel costs. Essence The other is caused by reasons such as first energy and energy conversion devices, the task of energy storage system (device) is to balance the energy output, that is, not only the peak of energy output, but also to fill the output volume. Low valley (that is, reclamation).
For example, in the solar heat utilization system, the energy storage device needs to be set. The working principle of solar heat use, the heat flow leaves the heat collector after leaving the heat collector, and then the thermal machine is provided by the thermal converter. In the case of no sunlight, the cold flow was directly passed through the energy storage device, the storage heat was extracted and passed to the thermal machine.
Therefore, the energy storage system can store excess thermal energy, kinetic energy, electrical energy, position energy, chemical energy, etc., and change the output capacity, output location, output time, etc. of the energy.