SYSTEM FOR STORING AND OUTPUTTING THERMAL ENERGY HAVING A HEAT ACCUMULATOR AND A COLD ACCUMULATOR AND METHOD FOR THE OPERATION THEREOF

摘要

The invention relates to a system for storing and outputting thermal energy and a method for operating said system. Said system has a heat accumulator (14) and a cold accumulator (16). According to the invention, the heat accumulator (14) and the cold accumulator (16) are discharged in two separate discharging circuits (40, 52), wherein the thermal energy is converted into electrical energy, for example by means of a generator (G). The residual heat from the process in the circuit (40) can be advantageously fed to the process in the circuit (52) by means of a first heat exchanger (51), whereby the total efficiency is advantageously improved. Furthermore, the heat from the heat accumulator (14) can be advantageously transferred into the first circuit (40) by means of a waste-heat steam generator (68). The heat accumulator (14) and the cold accumulator (16) can be charged, for example, with excess energy from the electric network by means of a motor (M). Excess energy reserves of alternative energy resources, for example, can thus be stored.