Method and system for storing and extracting low-temperature heat energy

摘要

Heat energy is stored chemically in and extracted from an energy accumulator containing a substance which contains less liquid in the charged, high-energy condition of the accumulator than it does in the discharged low-energy condition of the accumulator, which is associated with vapor condensing and generating means which is maintained at a low temperature as compared with the accumulator in which a liquid container is comprised. Vapor is driven off from the accumulator substance and transferred to the vapor condensing and generating means when energy is stored in the accumulator, and is returned to the accumulator when heat energy is extracted therefrom. The system comprising the accumulator and said vapor condensing and generating means is maintained substantially free from other gases than said vapor.