Refrigeration cycle device

A refrigeration cycle device comprising:

• a heat source unit that has a compressor and a heat-source-side heat exchanger;
• a first use unit that is separated from the heat source unit and that has a first use-side heat exchanger;
• a first connection flow path that connects the heat source unit to the first use unit and causes a first refrigerant to flow;
• and
• a second connection flow path that connects the heat source unit to the first use unit and causes a second refrigerant to flow, wherein
• a specific enthalpy of the second refrigerant is smaller than a specific enthalpy of the first refrigerant,
• the heat source unit, the first use unit, the first connection flow path, and the second connection flow path constitute a refrigerant circuit that includes the compressor, the heat-source-side heat exchanger, and the first use-side heat exchanger,
• the refrigerant circuit repeats a vapor compression refrigeration cycle,
• the refrigerant circuit uses a refrigerant that has a saturation pressure that is 4.5 MPa or higher when a saturation temperature reaches 65° C., or a refrigerant that has a critical temperature that is 65° C. or lower;
• and
• the first connection flow path comprises a metallic first connection pipe and a metallic second connection pipe, and causes a refrigerant to flow from one of the heat source unit and the first use unit to both of the first connection pipe and the second connection pipe, and causes refrigerants, that each flow in a corresponding one of the first connection pipe and the second connection pipe, to each flow from the corresponding one of the first connection pipe and the second connection pipe to the other of the heat source unit and the first use unit,
• the second connection flow path comprises a metallic pipe that causes a refrigerant, that has a specific enthalpy that is smaller than a specific enthalpy of the first connection flow path, to flow, and
• at least one of the first connection pipe and the second connection pipe has an outside diameter that is substantially the same as an outside diameter of the metallic pipe of the second connection flow path and has a covering color that differs from a covering color of the metallic pipe of the second connection flow path.

A refrigeration cycle device comprising:

• a heat source unit that has a compressor and a heat-source-side heat exchanger;
• a first use unit that is separated from the heat source unit and that has a first use-side heat exchanger;
• a second use unit that is separated from the heat source unit and that has a second use-side heat exchanger;
• a first connection flow path that connects the heat source unit to the first and the second use units and causes a first refrigerant to flow;
• and
• a second connection flow path that connects the heat source unit to the first and the second use units and causes a second refrigerant to flow, wherein
• a specific enthalpy of the second refrigerant is smaller than a specific enthalpy of the first refrigerant,
• the heat source unit, the first use unit, the second use unit, the first connection flow path, and the second connection flow path constitute a refrigerant circuit that includes the compressor, the heat-source-side heat exchanger, and the first and the second use-side heat exchangers,
• the refrigerant circuit repeats a vapor compression refrigeration cycle,
• the refrigerant circuit uses a refrigerant that has a saturation pressure that is 4.5 MPa or higher when a saturation temperature reaches 65° C., or a refrigerant that has a critical temperature that is 65° C. or lower,
• the first connection flow path comprises a metallic first connection pipe and a metallic second connection pipe, and causes a refrigerant to flow from one of the heat source unit and the first use unit to both of the first connection pipe and the second connection pipe, and causes refrigerants, that each flow in a corresponding one of the first connection pipe and the second connection pipe, to each flow from the corresponding one of the first connection pipe and the second connection pipe to the other of the heat source unit and the first use unit,
• the first connection flow path causes a refrigerant to flow from one of the heat source unit and the second use unit to both of the first connection pipe and the second connection pipe, and causes refrigerants, that each flow in a corresponding one of the first connection pipe and the second connection pipe, to each flow from the corresponding one of the first connection pipe and the second connection pipe to the other of the heat source unit and the second use unit,
• the first connection pipe and the second connection pipe are main pipe parts that are common to the first use unit and the second use unit,
• the first use unit has a first valve that opens and closes the first connection pipe and a second valve that opens and closes the second connection pipe,
• when the first use unit is stopped from a state in which the first use-side heat exchanger has been made to function as a heat dissipater, the first valve and the second valve are closed, and
• the first connection flow path is configured such that a single pipe is connected to a collecting pipe comprising two or more pipes including the first connection pipe and the second connection pipe, and a flow path cross-sectional area of the collecting pipe is greater than or equal to 90% of a flow path cross-sectional area of the single pipe.