Abstract:
PURPOSE: An evaporator for a loop heat pipe system is provided to increase contact conductance by improving a contacting state by connecting a sintered wick and a heating plate simultaneously with sintering. CONSTITUTION: The evaporator for a loop heat pipe system includes: a heating plate(10) of a metal material transmitted heat from a heating source; a sintered wick(20) transmitted the heat by being connected to one side of the heating plate; and a groove(30) formed on the contact surface of the heating plate and the sintered wick, and functioning as a path that a gas phase-changed in the sintered wick can flow out through a gas transfer tube(220). The groove is formed on one side of the heating plate in the shape of a groove with the bottom side and both sides. The sintered wick is touched to at least one of both sides of the groove by a part thereof inserted in the groove.
Abstract:
A method for manufacturing a sintered metal wick for a loop heat pipe is provided to improve gas permeability and capillary pumping force, in particular cooling an electronic heating component with greater than 130W of thermal load. A method for manufacturing a sintered metal wick for a loop heat pipe comprises the following steps. A predetermined amount of aspheric metal particles are placed in an electrical sintering furnace so that the aspheric metal particles can be charged with electricity. The electrical sintering furnace is applied with an electric current(40) and heated up to a temperature of 500°C~800°C. The temperature of 500°C~800°C is sustained for 5~10 minutes to sinter the aspheric metal particles.
Abstract:
PURPOSE: An enantioelective method for preparing 2-(1-hydroxy)-buta-2,3-dienolate derivatives is provided selectively prepare enantiomers. CONSTITUTION: An enantioelective method for preparing optically active methyl 2-(1-hydroxy)-buta-2,3-dienolate derivatives comprises: a step of reacting a compound of chemical formula 1 with tribromoborane of chemical formula 2(BBr_3) to prepare a compound of chemical formula 3; a step of reacting the compound of chemical formula 3 with compounds of chemical formulas 4 and 5(i-Pr_2NCH_2CH_3); and a step of adding a compound of chemical formula 6(R-CHO) to prepare a compound of chemical formula 7.
Abstract:
PURPOSE: A manufacturing method of an evaporator for a looped heat pipe system is provided to easily obtain an electro-thermal pin with a complex structure, and to improve contacting state of the electro-thermal pin and a wick. CONSTITUTION: A manufacturing method of an evaporator for a looped heat pipe system comprises the following steps: forming plural porous wicks(S1); forming plural electro-thermal pins including wick combination units to be combined with the wicks(S2); forming a unit combination by locating one wick from the plural wicks on the wick combination unit on the electro-thermal pin(S3); interlinking contacting surfaces of the wick and the electro-thermal pin by applying heat or pressure to the unit combination(S4); forming a unit combination structure by arranging the unit combinations in the horizontal direction to put the unit combinations in one surface(S5); interlinking the unit combinations by applying the heat or the pressure to the unit combination structure(S6); and combining the contacting surface of the unit combination structure and the electro-thermal pin by applying the heat or the pressure(S7).
Abstract:
PURPOSE: An evaporator manufacturing method for a looped heat pipe system is provided to perform final sintering step in a state of inserting the preliminary molding body into a projection unit of a base of a evaporator in order to increase a contact conductance value. CONSTITUTION: A base in which multiple of projection unit is included is formed(S1). A preliminary molding body is formed by applying hear or pressure to at least one molding material(S2). The preliminary molding body is inserted to the interval of the projection units of the base(S3). The preliminary molding body is formed into multi-pore sintered wick by heating the preliminary molding body and projection units of the base to a sintering temperature(S4).
Abstract:
PURPOSE: A method for simultaneously measuring properties of a porous material is provided to calculate the valid pore radius from a surface tension of the maximum capillary and transmissive liquid. CONSTITUTION: A method for simultaneously measuring properties of a porous material comprises the following steps of: mounting a test piece inside a measuring chamber so that only the predetermined transmissive cross-section of the test piece can be exposed to the inner flow of the measuring chamber; and filling the transmissive liquid in a transmissive liquid reservoir.