CPC F01K 3/12 (2013.01) [F01K 3/006 (2013.01)] | 14 Claims |
1. An absorption-desorption-based Carnot battery system for electrical energy storage, comprising:
a solution repository including at least one solution tank for thermochemical energy storage, the solution being reversibly capable storing and releasing refrigerant;
a refrigerant repository including at least one refrigerant tank for thermochemical energy storage;
an expander for heat-to-power energy conversion;
a compressor for power-to-heat energy conversion;
an external vapor-compression heat pump loop positioned between the solution tank and the refrigerant tank and including heating and cooling loops and the compressor for receiving surplus electricity from a renewable energy source to generate heat and raise a temperature of the solution during a charging cycle and generating refrigerant vapor in the solution tank;
a vapor communication pathway between the solution tank and the refrigerant tank for receiving refrigerant vapor from solution or refrigerant tank and passing to the other tank,
an internal heat loop between the refrigerant tank and the solution tank, the internal heat loop including reducing the temperature difference between the solution and refrigerant tanks in the pre-discharging process, recovering the absorption heat in the discharging process, and recapturing the condensation heat in the charging process;
a controller to maintain the internal heat exchange pathway open and open the external heating and cooling loop during a pre-charging cycle to cool the refrigerant tank and the solution tank to reduce a temperature differential between the refrigerant tank and the solution tank.
|