| 摘要 |
PROBLEM TO BE SOLVED: To provide the vapor condenser in a vacuum drying device capable of achieving the enhancement of a heat transfer capacity, the reduction of the transmission temperature difference loss of a cooling medium and the vacuum vapor of a condensing surface and an increase in the coefficient of the nucleate boiling heat transmission of a cooling evaporation round pipe and the coefficient of boundary film heat transmission of a circulating heating medium at the same time to develop a good heat transfer capacity and a highly efficient vapor condensing capacity. SOLUTION: The cooling medium evaporation round pipe of the vapor condenser of a vacuum dryer is altered to an inner surface grooved round pipe from a smooth pipe to be subjected to deformation processing to be formed into a flat oval pipe. One or both of a pair of flat surfaces are brought to the close contact state with the inner wall surface of the passage of a heating medium liquid to be mounted into the passage, the close contact area of the cooling medium evaporation oval pipe with the inner wall surface of the heating medium liquid passage in a vapor condensing plate is increased, rods for forming turbulent flows at an equal interval are attached along the cooling medium evaporation oval pipe mounted in the liquid passage to disturb the laminar flow on the outer surface of the cooling medium evaporation oval pipe to accelerate the convection boundary film heat transfer of the heating medium liquid. COPYRIGHT: (C)2008,JPO&INPIT
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