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

摘要

The method involves heating working fluid i.e. ammonia, during a loading cycle of a heat accumulator (12), and cooling the fluid during a discharging cycle of the accumulator, where the fluid is expanded through one of first and second thermal fluid energy machines (22, 25). The fluid is vaporized over a heat exchanger (16) during the loading cycle and condensed over the heat exchanger or another heat exchanger (19) during the discharging cycle, where the heat exchangers produce temperature equalization with the environment. The first thermal fluid energy machine is designed as a hydrodynamic compressor, and the second thermal fluid energy machine is designed as a turbine. The loading cycle and the discharging cycle are configured as a Rankine process. An independent claim is also included for a system for storage and delivery of thermal energy in and from a heat accumulator.