| 摘要 |
PROBLEM TO BE SOLVED: To cause a heat exchanger having a plurality of flat pipes and header collecting pipes to exert its maximum performance, when the heat exchanger functions as an evaporator.SOLUTION: A heat exchanger includes a flat pipes (31), a header collecting pipe (70), and a fin. An end of the flat pipe (31) is inserted in the header collecting pipe (70). When the heat exchanger functions as an evaporator, a refrigerant in a vapor-liquid two-phase state flows upward in a partial space (71a) inside the header collecting pipe (70). An area given by subtracting the area Aof projection of a part of the flat pipe (31) located in the partial space (71a) on a plane perpendicular to the axial direction of the header collecting pipe (70) from the area Aof a section of the partial space (71a) perpendicular to the axial direction of the header collecting pipe (70) is determined to be the effective sectional area A of the partial space (71a). This effective sectional area A is set based on the mass flow rate of the refrigerant flowing into the partial space (71a) inside the header collecting pipe (70). |
