| 摘要 |
PURPOSE:To exhibit heat absorbing capacity sufficiently by a method wherein the opening area of a communicating hole nearest to the connecting port of a refrigerant discharging pipe for the upper tank of a tube element is made smaller than the same of the communicating port nearest to the connecting port of the refrigerant introducing pipe for a lower tank. CONSTITUTION:The tube element 2, provided with the tanks 7, 8 communicating mutually through communicating holes at upper and lower ends thereof and a path 9 communicating the tanks mutually, and a corrugated fins 3 are laminated alternately to a plurality of stages and the connecting port 10 of the refrigerant introducing pipe is arranged at the lower end on the outermost side element 2 so that the axial line of the port 10 is orthogonal to the laminating direction of the element 2 and the fin 3, while the connecting port 11 of the refrigerant discharging pipe is arranged at the upper tank on the uppermost side element 2 on the other side so that the axial line of the port 11 is parallel to the same of the connecting port 10 of the tank 7 of the element 2. Further, the opening area of said communicating hole nearest to the connecting port 10 of the tank 7 is designed so as to be smaller than the same of said communicating hole nearest to the connecting port 10 of the tank 8.
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