Heat pump and phase-change energy storage device

A system comprising

• a first heat pump comprising an evaporator and a condenser, and comprising means for conveying a refrigerant fluid between two heat exchangers, said refrigerant fluid circulating through a first closed circuit;
• a first heat exchanger and a second heat exchanger, the first heat exchanger being used as cold source by the heat pump, and at least one of said first and second heat second exchangers comprising:
• i. a portion of the first circuit to convey the refrigerant fluid through said first or second heat exchanger;
• ii. a portion of a second circuit in which a secondary fluid circulates, to convey said secondary fluid through said first or second heat exchanger;
• iii. a phase-change material distributed in the heat exchanger and collecting a portion of an amount of thermal energy transported by the refrigerant fluid in the portion of the first circuit or by the secondary fluid in the portion of the second circuit;
• a second heat pump comprising an evaporator and a condenser and comprising a third circuit for conveying a third refrigerant fluid between the evaporator and the condenser of said second heat pump, said evaporator allowing a calorific exchange between the third refrigerant fluid and a primary calorie source and said condenser being positioned in the first heat exchanger to allow a calorie exchange between, on the one hand, the third refrigerant fluid and the phase-change material, and, on the other hand, the third refrigerant fluid and the secondary refrigerant fluid.