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고득용(Deuk-Yong Koh),이관수(Kwan-Soo Lee) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.4
A superconducting magnetic energy storage (SMES) system has shorter response time and longer life time, and is more economical, and environment-friendly than other uninterruptible power supply (UPS). A conduction cooling system is well answer for the high temperature superconductor (HTS) SMES system. Because the conduction cooling system is simple, light and small structure. The purpose of this paper is to design and verify the effective conduction cooling system for the HTS SMES system. The analysis of heat loads in cryostat is performed. Thermal shield heat loads, temperatures of HTS coil surface and conduction Cu plate are estimated and measured.
부하추종형 고효율 지열히트펌프 시스템에 관한 연구 (1)
고득용(Koh, Deuk-Yong),김욱중(Kim, Ook-Joong),최상규(Choi, Sang-Kyu),장기창(Chang, Ki-Chang) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.4
Cycle simulation of Ground Source Heat Pump[GSHP] system was carried out to determine the design specification of basic components such as turbo compressor and heat exchangers. Part load operation characteristics of the designed GSHP system was estimated using the compressor and heat exchanger performance data. A 50RT class turbo compressor for GSHP system is now under development, in which R134a refrigerant is adopted as working fluid. The compressor with variable cascade diffusers is designed to work both in cooling and heating modes so that it can actively keep up with the climate change with high efficiency. The normal running speeds of the compressor are 59000rpm for heating mode and 70000rpm for tooling mode respectively. It has two identical impellers at both ends of the rotor so as to minimize aero-induced thrust force effectively. GSHP system was coupled with a vortical type heat exchanger, and heat gain and heat loss from ground were evaluated per a bore hole. For the optimal integration of the heat pump system, its header for circulating fluid was combined with the ground heat exchangers in parallel and series configuration.
고온초전도 전력케이블 저온용기의 최적단열설계에 관한 연구
고득용(Deuk-Yong Koh),이관수(Kwan-Soo Lee) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.4
The object of this study is to find the optimal insulation design conditions of a HTS power cable cryostat. The optimum condition of a cable cryostat is obtained by varying types of MLIs, cable core weights, spacer diameters, winding pitches and MLI layer numbers. As the weight of cable core is increased, conduction heat transfer from surroundings to cable cryostat is increased. But as the spacer pitch is increased from 120 ㎜ to 200 ㎜, the heat leak of cable cryostat remains almost constant. The optimal number of MLI layers is suggested. Double ply MLI is more effective than triple ply MLI and the insulation effect is best when the number of MLI layers is 36.
홍용주(Yong-Ju Hong),염한길(Han-Kil Yeom),박성제(Seong-Je Park),김효봉(Hyo-Bong Kim),고득용(Deuk-Yong Koh) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
SMES systems need cryogenic cooling systems. Conduction cooling system has more effective, compact structure than cryogen. In general, 2 stage GM cryocoolers are used for conduction cooling of HTS SMES system. 1st stages of cryocoolers are used for the cooling of current leads and radiation shields, and 2nd stages of cryocoolers for HTS coil. For the effective conduction cooling of the HTS SMES system, the temperature difference between the cryocooler and HTS coil should be minimized. In this paper, a cryogenic conduction cooling system for HTS SMES is analyzed to evaluate the performance of the cooling system. The analysis is carried out for the steady state with the heat generation of the HTS coil and effects of the thermal contact resistance. The results show the effects of the heat generation and thermal contact resistance on the temperature distribution.
홍용주(Yong-Ju Hong),염한길(Han-Kil Yeom),박성제(Seong-Je Park),김효봉(Hyo-Bong Kim),고득용(Deuk-Yong Koh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A SMES system stores the energy in the cryogenically cooled superconducting coils to reduce the losses. A SMES system has coils, refrigeration systems and a cryostat. Conduction cooling methods without liquid cryogen have a lower cooling cost, simple and reliable structure of the system. The HTS SMES coil has composite structure, which consists of several filaments of Bi, Ag and epoxy film. It has complex thermal characteristics due to the composition and geometry. To reduce cooling costs, the temperature difference of the coil and heat load to the cryocooler should be minimized. In this study, the detail thermal analysis on the cooling system of the HTS SMES system was performed. The thermal conduction analyses of HTS coil were performed to determine the anisotropic thermal conductivity of the composite. The results show the effective thermal conductivity of the composite and temperature difference of the HTS SMES system.
홍용주(Yong-Ju Hong),고준석(Junseok Ko),김효봉(Hyo-Bong Kim),박성제(Seong-Je Park),고득용(Deuk-Yong Koh),염한길(Han-Kil Yeom) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A pulse tube cryocooler, which has no moving parts in the coldfinger, has the ability to achieve long life, high reliability, less vibration. In recent years, the pulse tube cryocooler have cooling capacities and thermal efficiencies comparable with the Stirling cryocooler. These advantages promote the widespread use of the pulse tube cryocooler in many fields, especially in space-borne application that require a long life and a stable temperature. In this study, SAGE simulation software is used to model the Stirling type pulse tube cryocooler with the inertance tube. Simulation model contains a dual acting compressor, heat exchangers, an annular type regenerator, a pulse tube, an inertance tube and a reservoir. In this model, the temperature of the hot end is held at 300 K and that of the cold end is 80 K. The design model is aiming to provide the cooling capacity of over 1 W. SAGE nodel provides detail configurations of the coldfinger and phase controller.
홍용주(Yong-Ju Hong),박성제(Seong-Je Park),고득용(Deuk-Yong Koh),최영돈(Young-Don Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
As the component density of electronics increases due to smaller line width, so does the power dissipation. Microscale Joule-Thomson refrigerator has gained attention in the cooling of electronics due to the its capability of cooling of small spot. A typical microscale JT refrigerator consists of four main compontents; inlet and outlet ports, counter flow heat exchanger, capillary channel and evaporator. The counter flow heat exchanger and capillary channel have serpentine microchannels. Cooling power is generated by the isenthalpic expansion of a gas through the capillary channel, and the performance is kept by counter flow heat exchanger. In this study, Thermodynamic simulations, which are based on the simple Linde-Hampson system, was undertaken to use it to design a microscale JT refrigerator. The results shows the effect of inlet pressure on the cooling capacity. effectiveness, mass flow rate, evaporator temperature.