A heat exchange unit for a refrigeration apparatus using CO 2 as refrigerant and including a thermal storage unit and a utilization-side heat exchanger, comprising: at least one compressor, a heat-source-side heat exchanger an expansion device, a heat exchange unit gas port configured to communicate to the utilization-side heat exchanger disposed outside the heat exchange unit, a first heat exchange unit fluid port configured to communicate to the utilization-side heat exchanger, a second heat exchange unit fluid port communicating to the heat-source-side heat exchanger, a third heat exchange unit fluid port communicating to the expansion device, and a heat exchange unit gas communication pipe communicating between the heat exchange unit gas port and the at least one compressor, wherein an outlet of the at least one compressor is connected to an inlet of the heat-source-side heat exchanger by a refrigerant pipe, an outlet of the heat-source-side heat exchanger is connected to the second heat exchange unit fluid port by a first heat exchange unit fluid communication pipe, the third heat exchange unit fluid port is connected to an inlet of the expansion device by a second heat exchange unit fluid communication pipe and an outlet of the expansion device is connected to the first heat exchange unit fluid port by the Z second heat exchange unit fluid communication pipe, and the second heat exchange unit fluid port and the third heat exchange unit fluid port configured to communicate to the thermal storage unit including a thermal storage including or accumulating a thermal storage material, characterised in that the heat exchange unit further comprises a receiver, which is located on the second heat exchange unit fluid communication pipe, particularly between the first heat exchange unit fluid port and the expansion device, wherein the receiver is configured to separate liquid refrigerant and gas refrigerant. at least one compressor, a heat-source-side heat exchanger an expansion device, a heat exchange unit gas port configured to communicate to the utilization-side heat exchanger disposed outside the heat exchange unit, a first heat exchange unit fluid port configured to communicate to the utilization-side heat exchanger, a second heat exchange unit fluid port communicating to the heat-source-side heat exchanger, a third heat exchange unit fluid port communicating to the expansion device, and a heat exchange unit gas communication pipe communicating between the heat exchange unit gas port and the at least one compressor, wherein an outlet of the at least one compressor is connected to an inlet of the heat-source-side heat exchanger by a refrigerant pipe, an outlet of the heat-source-side heat exchanger is connected to the second heat exchange unit fluid port by a first heat exchange unit fluid communication pipe, the third heat exchange unit fluid port is connected to an inlet of the expansion device by a second heat exchange unit fluid communication pipe and an outlet of the expansion device is connected to the first heat exchange unit fluid port by the Z second heat exchange unit fluid communication pipe, and the second heat exchange unit fluid port and the third heat exchange unit fluid port configured to communicate to the thermal storage unit including a thermal storage including or accumulating a thermal storage material, characterised in that the heat exchange unit further comprises a receiver, which is located on the second heat exchange unit fluid communication pipe, particularly between the first heat exchange unit fluid port and the expansion device, wherein the receiver is configured to separate liquid refrigerant and gas refrigerant.