Abstract: The invention is directed to a thermochemical system such as a thermochemical heat battery that can efficiently operate at relative low temperatures. Accordingly, a system for thermochemical storage is provided which system comprises a thermochemical reactor and a water condenser for dehumidifying a gas stream comprising a condensing surface provided with a hygroscopic material.

Abstract: A closed-cycle thermal energy storage system includes a thermochemical reactor [400] containing a solid thermochemical material, a heat exchanger [402], a fan [406] for creating forced convection of an air/water mixture circulating around the closed cycle, an evaporator/condenser [408], and a pressure control system that includes a pressure sensor [422], a controller [424], and a pump [404]. The pressure control system actively controls the pressure of the air/water mixture to produce a desired temperature difference across the thermochemical reactor [400]. The adjustable pressure control system controls the pressure of the air/water mixture to a first pressure (e.g., between 10 mbar and 1 bar) during a hydration phase and a second pressure (e.g., between 1 bar and 10 bar) during a dehydration phase.

Abstract: A closed-cycle thermal energy storage system includes a thermochemical reactor [400] containing a solid thermochemical material, a heat exchanger [402], a fan [406] for creating forced convection of an air/water mixture circulating around the closed cycle, an evaporator/condenser [408], and a pressure control system that includes a pressure sensor [422], a controller [424], and a pump [404]. The pressure control system actively controls the pressure of the air/water mixture to produce a desired temperature difference across the thermochemical reactor [400]. The adjustable pressure control system controls the pressure of the air/water mixture to a first pressure (e.g., between 10 mbar and 1 bar) during a hydration phase and a second pressure (e.g., between 1 bar and 10 bar) during a dehydration phase.