Kyungdong Navien Co., Ltd.

Hynix Semiconductor Inc.

Yonsei University

Young Mo Kim

Young S Choi

Hyun Chul Sohn

Sung Min Hwang

Hee Do Na

Young Sik Choi

Sung Geun 611-1303 Jukong Apt Kim

The present invention discloses a round plate heat exchanger having a heat exchange part in which a plurality of heat medium flow paths and a plurality of combustion gas flow paths are formed alternately adjacent to each other between a plurality of plates. The plurality of plates are formed by stacking a plurality of unit plates comprising a first plate and a second plate stacked each therein. The plurality of heat medium flow paths are formed to be spaced from each other between the first plate and the second plate, a plurality of heat medium connection flow paths are formed in some areas of the plurality of heat medium flow paths, and each of the plurality of combustion gas flow paths is formed between the second plate of one unit plate and the first plate of another unit plate stacked adjacent to the unit plate.

Round plate heat exchanger

The present invention relates to a heat exchanger comprising: a burner for combusting a mixture of air and fuel; and a heat exchange unit in which heat is exchanged between combustion gas caused by the combustion of the burner and a heating medium, wherein the heat exchange unit includes a plurality of unit plates stacked on each other, and a sensible-heat exchange unit and a latent-heat exchange unit coaxially disposed around the burner are integrally formed with the unit plates.

Heat exchanger

A curved plate heat exchanger includes a heat exchange unit in which heat medium flow paths and combustion gas flow paths are alternately formed to be adjacent to each other in spaces between a plurality of plates, wherein the plurality of plates are configured in such a manner whereby a plurality of unit plates, in which first and second plates are stacked, are formed; wherein the heat medium flow paths are formed between the first plate and the second plate of the unit plate; and wherein the combustion gas flow paths are formed at constant interval between the second plate of the unit plate located on one side of the adjacent unit plates and the first plate of the unit plate located on the other side.

Curved plate heat exchanger

A latent-heat exchanger comprising an upper heat exchange unit in which a plurality of circulating-heating-water heat exchange units having a circulating-heating-water flow channel formed therein and a lower heat exchange unit disposed on the lower side of the upper heat exchange unit, in which a plurality of direct-water heat exchange units having a direct-water flow channel formed therein is provided.

Latent-heat exchanger for hot-water heating and condensing gas boiler including same

Provided are a 3-dimensional non-volatile memory device and a method of fabricating the same. The 3-dimensional non-volatile memory device may include a substrate; semiconductor pillars, which are arranged at a certain interval in a first direction and a second direction different from the first direction; a string isolation film, which is arranged between the semiconductor pillars arranged in the first direction among the semiconductor pillars and extends in the first direction and a third direction vertical to the main surface of the substrate; first sub-electrodes repeatedly stacked on the substrate in the third direction; second sub-electrodes, which are electrically isolated from the first sub-electrodes by the string isolation film, and are repeatedly stacked on the substrate in the third direction; and information storage films including a first information storage film and a second information storage film.

3-dimensional non-volatile memory device and method of fabricating the same

A heat exchanger comprising a heat exchange unit in which heat is exchanged between combustion gas caused by a burner for combusting a mixture and first/second heating mediums, and heating medium flow channels through which the first/second heating mediums flow and a combustion gas flow channel through which the combustion gas flows are alternately formed adjacent to each other in spaces between a plurality of plates and a combustion gas discharge unit through which the combustion gas having passed through the heat exchange unit is discharged is provided.

Heat exchanger for condensing gas boiler

A heat exchanger comprising a mixture inflow unit into which a mixture of air and fuel is introduced, a burner for combusting the mixture introduced through the mixture inflow unit, a heat exchange unit that is disposed around the burner, and a combustion gas discharge unit for discharging the combustion gas having passed through the heat exchange unit is provided.

The present invention relates to a combustion apparatus capable of reducing the emission amount of nitrogen oxide and enabling stable combustion in the entire area of a set load. The combustion apparatus includes: a premixing chamber for premixing air and a gas; a blower for supplying a mixed-gas of the air and the gas to a burner; a combustion chamber for burning the mixed-gas by ignition of the burner; a heat exchanger for exchanging heat with water by using combustion heat in the combustion chamber; and an exhaust gas discharge part for discharging the exhaust gas passing through the heat exchanger, wherein the premixing chamber is formed in a Venturi shape having a throat part of which the cross-section area is tapered between an inlet and an outlet through which the air passes, the throat part of the premixing chamber being connected to a gas supply part for supplying a gas for combustion, and to an exhaust gas recirculation tube to which some of the exhaust gas having passed through the heat exchanger is introduced in proportion to differential pressure according to the flow rate of the mixed-gas passing through the throat part.

Combustion apparatus

The present invention relates to a combustion apparatus capable of reducing the combustion load of a burner and improving the combustion efficiency thereof. The combustion apparatus includes: a premixing chamber for premixing external air, introduced through an air supply inlet, with a combustion gas; a blower for supplying a mixed air premixed in the premixing chamber toward a burner; a combustion chamber for burning the mixed air by ignition of the burner; a heat exchanger for heat exchange with room heating water by using the combustion heat of the combustion chamber; an exhaust gas discharging part for discharging an exhaust gas having passed through the heat exchanger; and a duct through which the exhaust gas having passed through the exhaust gas discharging part is discharged outside, wherein the combustion apparatus includes an air intake preheater for heat exchange between the exhaust gas discharged to the duct through the exhaust gas discharging part and the air supplied to the premixing chamber through the air supply inlet, the air intake preheater including a channel-forming member in which a plurality of unit plates are stacked with a predetermined interval therebetween to form an exhaust gas channel and an air intake channel therein that are separated from each other, are adjacent to each other, and are alternately arranged.

Combustion apparatus having air intake preheater

The present invention relates to a method for braze-welding a fixing plate and a flow channel cap in a heat exchanger, and to a heat exchanger produced by same. The method includes: providing a fixing platehaving a plurality of resilient protrusionsfor snap-fitting; providing a flow channel cap, one endof which is L-shaped to be snap-fitted onto the resilient protrusionand the other end of which has a stepped portion; inserting the stepped portionof the flow channel capinto the resilient protrusionsuch that an endof the stepped portioncontacts an end of the resilient protrusion; pressing the L-shaped endof the flow channel capagainst the resilient protrusionof the fixing platesuch that the L-shaped endis snap-fitted onto the resilient protrusionand thus tightly contacts the fixing plate, and the resilient protrusionthus press-contacts the endof the stepped portionto enable an endof the stepped portionto tightly contact the fixing plate; and braze-welding the fixing plateand the flow channel cap. The above-described method eliminates a spot-welding process which might otherwise be performed prior to the process of braze-welding the fixing plate and the flow channel cap in conventional heat exchangers, to thereby reduce manufacturing costs and labor and to improve productivity.

Method for braze-welding a fixing plate and a flow channel cap in a heat exchanger, and heat exchanger produced by same

The device relates to a heat exchanger in which heat transfer between heating water passing through the inside of heat exchanging pipes and combustion gas is efficiently performed. The heat exchanger includes a plurality of heat exchanging pipes, through the inside of each of which heating water passes. The cross-section of each of the heat exchanging pipes has protrusions and recessions alternately arranged in the width direction of the heat exchanging pipe, so as to extend the flow path for the combustion gas passing between the heat exchanging pipes.

A method of forming a metal line of a semiconductor memory device is disclosed. An interlayer insulating layer, an etch-stop layer, a trench oxide layer, a hard mask layer and a photoresist layer are laminated over a semiconductor substrate in which a contact is formed. An exposure process is performed to form a photoresist pattern. The hard mask layer is partially etched by an etch process that employs the photoresist pattern. An etch process using the hard mask layer as an etch mask is performed to partially etch the trench oxide layer, the etch-stop layer and the interlayer insulating layer, thereby forming damascene trenches. Metal material is formed on the entire surface including the trenches. A chemical mechanical polishing process is then performed to expose the etch-stop layer, thereby forming a metal line.

Growing community of inventors

Gyeonggi-do, South Korea

Young Mo Kim