Thermal characteristics of conduction cooled 600 kJ HTS SMES system

Kim, Seokho; Sim, Kideok; Kim, Hae-Jong; Bae, Joon-Han; Lee, Eon-Young; Seong, K.C.; Jeong, Sangkwon

doi:10.1016/j.cryogenics.2008.10.005

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…인 절대 침상 안정, 보조기 착용 외에 침, 뜸, 한약, 약침, 부항 등을 함께 시행한다 [4][5][6][7][8][9] . 한의학적 치료를 시행할 시 연령과 골다공증, 외상 등에 대해 고려하 는데, 외상으로 발생한 경우에는 瘀血로, 골다공증 등의 신체의 약화로 인한 골절은 腎虛로 변증하여 치료한다 10) .…”

Section: 한의학적 치료 방법은 일반적인 보존적 치료 방법unclassified

Statistical Analysis on Hospitalized Patients with Thoracolumbar Compression Fracture at Single Korean Medicine Hospital: Retrospective Review

Jang

Kim

et al. 2023

J Korean Med

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Objectives: This study was designed to statistically analyze patients hospitalized for thoracolumbar compression fractures at Daejeon University Daejeon Korean Medicine Hospital from January 1, 2017 to December 31, 2021.Methods: A total of 62 patients were analyzed through electronic medical records in this study. The extracted data was analyzed using IBM SPSS ver.27.0.Results: 1. Traffic accident patients were more likely to reduce pain by more than half compared to falls and other patients. Patients without spinal disease were more likely to reduce pain by more than half compared to those without. The shorter the absolute bed rest and the longer the hospital stay, the higher the probability of pain reduction by more than half. 2. The duration of pain half-reduction was longer in patients with diabetes than in patients without diabetes. 3. The longer the hospitalization period and the shorter the absolute bed rest period, the less pain was reported upon discharge. Males complained of less pain at discharge than females, and patients without spinal disease complained less than those without. Patients who did not receive absolute bed rest complained of less pain upon discharge than those who did not.Conclusions: This study included patients hospitalized for thoracolumbar compression fractures and showed that etiology, absolute bed rest period, hospitalization period, gender, spinal disease, diabetes statistically affected the degree of pain reduction.

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Section: 한의학적 치료 방법은 일반적인 보존적 치료 방법unclassified

Statistical Analysis on Hospitalized Patients with Thoracolumbar Compression Fracture at Single Korean Medicine Hospital: Retrospective Review

Jang

Kim

et al. 2023

J Korean Med

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“…For some reason the factory requests that the recovery time Dt must be less than 0.5 h. So before the technical and economical factor d is calculated using formula (1), recovery time Dt should be checked based on the thermal analysis. If Dt is more than 0.5 h, we set d to 0 according to formula (2). And if Dt is less than 0.5 h, factor d is calculated on the basis of formula (1).…”

Section: Technical and Economical Factor D Of Cryocooler Mmentioning

confidence: 99%

“…Recent developments and advances on cryogenic technology have made conduction-cooled method widely applied to HTS SMES cryogenic cooling system. [1][2][3][4][5][6]. The conduction-cooled method is an appropriate cooling method for countries and regions where is difficult to obtain helium.…”

Section: Introductionmentioning

confidence: 99%

An evaluation method for small-scale conduction cooled SMES cryogenic cooling system based on thermal analysis

Tang

Dai

et al. 2015

Cryogenics

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“…In this section, the heat transfer and mechanics analysis using a FEM tool was performed and the results were presented. When the conduction cooling system design is performed, the heat invasion components including conductive and radiative parts should be considered above all [9][10][11][12].…”

Section: Design Of a MI Hts Magnet Under The Conduction Cooling Systemmentioning

confidence: 99%

Performance Test of a Metal Insulated HTS Magnet with Conduction Cooling

Choi¹,

Hwang

Lee

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. In the fabrication and operation of an HTS magnet, ensuring thermal stability against uneven quench is the most important factor. A sample HTS magnet was designed and fabricated with the metal insulation (MI) method and its fundamental characteristic analysis was conducted under the liquid nitrogen cooling system. On the basis of the electromagnetic analysis results, the thermal and mechanical structural design and detailed experimental analysis of the MI HTS magnet under the conduction cooling condition were performed in this paper. The conduction cooling condition was achieved using the 1st stage GM cryo-cooler. The characteristic resistances and the charging and discharging times of the magnet were measured according to the operating temperature of 32 K of the HTS magnet. The long-term current flowing test was conducted by monitoring the coil temperatures. In addition, the thermal stability of the HTS magnet was analyzed when the over current flowed into the magnet. The test results will be applied to the large size HTS MI magnet. IntroductionIn the fabrication and operation of an HTS magnet, ensuring thermal stability against uneven quench is the most important factor. The no insulation (NI) winding method allows the HTS magnet to maintain the best thermal stability by distributing the quench energy evenly [1][2][3][4]. The NI HTS magnet has the characteristic resistance connected to the inductance of the magnet in parallel. The charging and discharging time are dependent on the characteristic resistance. In the case of, however, the characteristic resistance of the NI HTS magnet is too small, the charging and discharging time takes too long to generate the desired magnetic field.In 2013, our research team had developed and tested a NI HTS magnet for a 10kW-class prototype DC induction heater. In the previous research, the characteristic resistance was measured to be 98 μΩ, and it required 2,300 s to charge the current of the magnet of 230 mH with the maximum magnetic flux density [5][6][7]. Thus, we employed the winding method of metal insulation (MI) using stainless steel to reduce the long charging and discharging time. A sample HTS magnet was designed and fabricated with the MI method and its fundamental characteristic analysis was conducted under the liquid nitrogen cooling system. The characteristic resistance was measured to be 2.9 mΩ and the charging and time constant of the discharging mode was calculated to be 2.5 s. For the higher than critical current flowed to the sample magnet, detailed investigations through voltage and temperature characteristic analysis were conducted [8].On the basis of the electromagnetic analysis results, the thermal and mechanical structural design of the MI HTS magnet under the conduction cooling condition were performed and the detailed experimental analysis results were presented in this paper. The minimum cooling temperature of the 1

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Thermal characteristics of conduction cooled 600 kJ HTS SMES system

Cited by 12 publications

References 3 publications

Statistical Analysis on Hospitalized Patients with Thoracolumbar Compression Fracture at Single Korean Medicine Hospital: Retrospective Review

Statistical Analysis on Hospitalized Patients with Thoracolumbar Compression Fracture at Single Korean Medicine Hospital: Retrospective Review

An evaluation method for small-scale conduction cooled SMES cryogenic cooling system based on thermal analysis

Performance Test of a Metal Insulated HTS Magnet with Conduction Cooling

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