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Kimhae, South Korea

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

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. Source

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

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. Source

LHE Inc. | Date: 2012-07-16


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

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. Source

LHE Inc. | Date: 2016-01-24

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