Kimhae, South Korea
Kimhae, South Korea

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Jeong J.Y.,LHE Co. | Jeong J.Y.,Inje University | Lee J.,Inje University | Yeom S.,Inje University | And 6 more authors.
International Journal of Precision Engineering and Manufacturing | Year: 2012

High-pressure facilities such as pressure vessels and storage equipment are widely used in all areas of manufacturing. Although many safety regulations have been enacted, mechanical defects and system operator errors sometimes cause industrial disasters. Since industrial disasters at high-pressure facilities cause greater loss of life and property, the installation of pressure-relief devices is mandatory. A rupture disc (also known as a bursting disc) is a type of non-reclosing pressure-relief device, equipped with a leak-tight seal. It is designed to prevent disasters and damage to equipment by immediate, complete rupture when the internal pressure of the plumbing reaches a predetermined level. Various types of rupture discs are cross-scored, and are activated by the reversal of a dome shape and pressure load. They are designed with an X-shaped groove on their surfaces to facilitate bursting without fragmentation. In this research, the processing characteristics of the grooving process, one of the major processes in the production of a cross-scored rupture disc, are investigated via experiments and finite element analysis (FEA) to obtain a design basis for cross-scored rupture discs required by high-pressure facilities with varying kinds of performance. The mechanical properties and chemical composition of the stainless steel used to produce cross-scored rupture discs are determined with a tensile testing machine and an electron microscope. The characteristics of the grooving process are then measured and compared with FEA results. © KSPE and Springer 2012.


Son J.,Korea University | Lee E.,Korea University | Kang H.,Korea University | Kim Y.,Korea University | And 3 more authors.
Transactions of the Korean Society of Mechanical Engineers, B | Year: 2012

Plate heat exchangers have been widely used in many industrial applications because of their compactness and high efficiency. Even though plate heat exchangers have been investigated extensively, studies on the effects of geometric parameters other than the chevron angle are very limited in the open literature. In this study, the effects of the chevron angle, corrugation length, corrugation depth, and the number of plates on the heat transfer and pressure drop characteristics of plate heat exchangers were investigated experimentally. Based on the experimental results, empirical correlations were proposed. More than 95% of the predictions made based on the correlations had relative deviations of less than ±10% when compared with the measured data. © 2012 The Korean Society of Mechanical Engineers.


Lee E.,Korea University | Kang H.,Korea University | Kim Y.,Korea University | Lim H.,LHE Co. | And 2 more authors.
2010 14th International Heat Transfer Conference, IHTC 14 | Year: 2010

A nitrogen double expander cycle has been widely used for liquefaction of natural gas in LNG-FPSO (Floating Production, Storage, and Offloading). An aluminum plate-fin heat exchanger (ALPHE) is usually adopted in the liquefaction cycle. In general, the ALPHE has a very large heat transfer surface area per unit volume. This surface area consists of primary and secondary (finned) surfaces. Even taking into account fin efficiency of the secondary surface, the effective surface area per unit volume can be typically five times greater than that of a shell-and-tube heat exchanger. Various types of fin are available in ALPHE and the fin type should be selected properly to optimize the performance. For example, serrated, wavy and perforated fin are particularly suitable for gas streams. The selection and design of the layer arrangement and effective length of each stream are very important design parameters for ALPHE. In this paper, to optimize the design of ALPHE, the effects of the design parameters on the performance of ALPHE were studied using a simulation method. The properties of nitrogen and natural gas were calculated from proper equations of state. Because the performance of ALPHE is mainly influenced by the fin type, fin frequency, fin height, fin thickness, and layer arrangement, the effects of the geometric design parameters on the performance of ALPHE were studied, and the optimum design conditions were suggested in this paper. © 2010 by ASME.


Lee E.,Korea University | Kang H.,Korea University | Heo J.,Korea University | Kim Y.,Korea University | And 2 more authors.
Transactions of the Korean Society of Mechanical Engineers, B | Year: 2011

Aluminum plate-fin heat exchangers (ALPHEs) are widely used in petroleum and gas-treated processes. The performance of the ALPHE is strongly dependent on the distribution characteristics of the header and the distributors of each fluid. In this paper, we define the aspect ratio in the side-entry type distributor and analyze the distribution characteristics using CFD-based numerical methods. The phenomena of velocity deviation and distribution with the aspect ratio and the inlet Reynolds number were analyzed by applying relative and absolute maldistribution parameters, and an optimum aspect ratio with the inlet Reynolds number was presented. © 2011 The Korean Society of Mechanical Engineers.


Kim M.,Korea Institute of Energy Research | Baik Y.-J.,Korea Institute of Energy Research | Park S.-R.,Korea Institute of Energy Research | Ra H.-S.,Korea Institute of Energy Research | Lim H.,LHE Co.
Experimental Thermal and Fluid Science | Year: 2010

Experimental study on cross-flow air-cooled plate heat exchangers (PHEs) was performed. The two prototype PHEs were manufactured in a stack of single-wave plates and double-wave plates in parallel. Cooling air flows through the PHEs in a crosswise direction against internal cooling water. The heat exchanger aims to substitute open-loop cooling towers with closed-loop water circulation, which guarantees cleanliness and compactness. In this study, the prototype PHEs were tested in a laboratory scale experiments. From the tests, double-wave PHE shows approximately 50% enhanced heat transfer performance compared to single-wave PHE. However, double-wave PHE costs 30% additional pressure drop. For commercialization, a wide channel design for air flow would be essential for reliable performance. © 2010 Elsevier Inc.


Trademark
LHE Inc. | Date: 2016-01-24

Motion detectors.


Trademark
LHE Inc. | Date: 2012-07-16

Mirrors.

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