http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
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.
600kJ급 SMES용 전도냉각시스템의 냉각특성 (Ⅰ)
홍용주(Yong-Ju Hong),염한길(Han-Kil Yeom),고득용(Deuk-Yong Koh),김효봉(Hyo-Bong Kim),박성제(Seong-Je Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
SMES systems need cryogenic cooling systems. Conduction cooling system has more effective, compact structure than cryogen. For the effective conduction cooling of the HTS SMES system, the temperature difference between the cryocooler and HTS coil should be minimized. In this study, an experimental study of a conduction cooling system for 600kJ HTS SMES is performed to evaluate the performance of the designed cooling system. Two GM cryocoolers are connected to HTS coil by braided wires, a heat exchanger and cooling plates. In this study, the HTS coil is not attached to the cooling system. To simulate the heat generation of HTS coil, heat load by electric heater is applied to the cooling system. The result shows the cool-down characteristics and temperature variation of the cooling system in the steady state.