• Title/Summary/Keyword: Heat Insulation

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A Study of Optimum Insulation Conditions of a HTS Power Cable Cryostat (고온초전도 전력케이블 저온용기의 최적단열설계에 관한 연구)

  • Koh, Deuk-Yong;Lee, Kwan-Soo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.4
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    • pp.333-338
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    • 2007
  • 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 mm to 200 mm, 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.

Improvement of the Thermal Characteristics of Synchronous Linear Motors Through Insulation (단열에 의한 동기식 리니어모터의 열특성 향상)

  • Eun, In-Ung
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.123-130
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    • 2002
  • Linear motors can drive a linear motion without intermediate gears, screws or crank shafts. Linear motors can successfully replace ball lead screw in machine tools because they have a high velocity, acceleration and good positioning accuracy. On the other hand, linear motors emit large amounts of heat and have low efficiency. In this paper, heat sources of a synchronous linear motor with high velocity and force measured and analyzed. To improve the thermal characteristics of the linear motor, an insulation layer with low thermal conductivity is inserted between cooler and machine table. Some effects of the insulation layer are presented.

The Control of Temperature of Green Roof System with the Roof Slab Insulation Method (옥상슬래브 단열조건에 따른 옥상녹화의 열환경 조정효과)

  • Yeo, In-Ae;Cho, Hong-Je;Yoon, Seong-Hwan
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.869-872
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    • 2008
  • On this study, the Control of Temperature is specified on the view of indoor comfort and building energy consumption. It is estimated by Dynamic heat load simulation which has the factors of insulation method and the soil thickness of the green roof system. The fact that the model which has no insulation has the greatest effect of dropping high temperature and the cooling load decrease is confirmed.

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Insulation Performance Evaluation of the Curtain Wall Anchoring Unit by 3D Heat Transfer Simulation and Life Cycle Cost Analysis (3차원 전열해석 및 생애비용 분석을 통한 커튼월 앵커링 유닛의 단열성능 향상 방안 평가)

  • Kang, Seung-Hee;Song, Seung-Yeong
    • Journal of the Korean Solar Energy Society
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    • v.23 no.4
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    • pp.63-70
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    • 2003
  • It is very important to improve the insulation performance of curtain wall anchoring unit since it is composed of materials with high thermal conductivity, such as aluminium, steel and so on. This study aims to evaluate the heating energy performance and economical efficiency of various alternatives which are different in position and material of insulation. As results, alternative of inserting the urethane washer & pad and coating the anchoring unit with urethane foam can improve the heating energy performance and L.C.C(Life Cycle Cost) by 6.33% and 0.95%, respectively, as compared with the existing case.

Performance Standards and Evaluation of Elastomeric Flexible Cellular Insulation (고무 발포 배관 보온 단열재의 성능 기준 및 평가)

  • Jeon, Hyun-Seok;Choi, Hyoun-Jung;Choi, Gyoung-Seok;Kang, Jae-Sik;Lee, Seung-Eon;Jeong, Gwang-Seop
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.614-617
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    • 2009
  • Elastomeric Flexible Cellular Insulation is widely used in construction fields to prevent condensation and frozen pipes, reduce energy, and improve insulation. However, when Elastomeric Flexible Cellular Insulation has been installed in buildings in Korea, there was no standardization, which resulted in heat loss Therefore, insulation design standards need to be developed and from these standards, pipe insulation should be improved to increase its efficiency. This study estimates temperature and surface-emissivity according to the thickness of insulation to evaluate thermal performance.

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Insulation Property of Cement-based Non-combustible Inorganic Insulation Using MgO and Redispersible Polymer Powder (산화마그네슘 및 재유화형 분말수지를 사용한 시멘트계 불연단열재의 단열특성)

  • Son, Bae-Geun;Song, Hun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.120-121
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    • 2021
  • The organic insulation material has excellent thermal insulation property, but it is difficult to expect fire stability, and semi inorganic insulation only delays combustible hour but it is difficult to expect fire stability. In this study, thermal insulation property of cement-based non-combustible inorganic insulation using cement and non combustible materials and redispersible polymer powder was studied. As a result of the experiment, the thermal insulation property decreased as the use of redispersible polymer powder increased, but the heat insulation property improved when using the appropriate amount.

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Field Application of Insulation Curing Method for the Concrete applying Double Layer Bubble Sheets Subjected to Cold Weather (이중버블시트를 이용한 단열보온 양생공법의 한중콘크리트 현장적용)

  • Hong, Seak-Min;Son, Ho-Jung;Oh, Chi-Hyun;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.83-85
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    • 2011
  • This study investigated the results of insulation heat curing method using double layer bubble sheet in concrete in cold weather environment. First of all, when double bubble sheets are applied, it was shown that concrete was protected from early freezing by remaining between 7℃ and 3℃ even in case outside temperature drops -7℃ below zero until the 3d day from piling. The insulation heat preservation curing method using the double bubble sheet applied in this field prevented early freezing owing to stable curing temperature management, deterring concrete strength development delay at low temperature, and obtained the needed strength. Also, it was proven that the method is highly effective and economic for cold weather concrete quality maintenance through curing cost reduction like construction period shortening and labor cost reduction, etc by reducing the process of temporary equipment installation and disassembling.

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Field Application of Insulation Curing Method with Double Bubble Sheets Subject to Cold Weather (이중버블시트를 이용한 단열양생공법의 한중콘크리트 현장적용)

  • Hong, Seak-Min;Lee, Il-Sun;Baek, Dae-Hyun;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.05b
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    • pp.25-28
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    • 2009
  • This study investigated the results of insulation heat curing method using double layer bubble sheet in slab concrete in cold weather environment. First of all, when double bubble sheets are applied, it was shown that slab concrete was protected from early freezing by remaining between 5 and $l0^{\circ}C$ even in case outside temperature drops $-11^{\circ}C$ below zero until the 4nd day from piling. The insulation heat preservation curing method using the double bubble sheet applied in this field prevented early freezing owing to stable curing temperature management, deterring concrete strength development delay at low temperature, and obtained the needed strength. Also, it was proven that the method is highly effective and economic for cold weather concrete quality maintenance through curing cost reduction like construction period shortening and labor cost reduction, etc by reducing the process of temporary equipment installation and disassembling.

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Thermal Analysis of a Cold Box for a Hydrogen Liquefaction Pilot Plant with 0.5 TPD Capacity (0.5 TPD 급 수소액화 파일럿 플랜트의 콜드박스 열해석)

  • KIM, HYOBONG;HONG, YONG-JU;YEOM, HANKIL;PARK, JIHO;KO, JUNSEOK;PARK, SEONG-JE;IN, SEHWAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.6
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    • pp.571-577
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    • 2020
  • Thermal analysis was performed for a cold box of a hydrogen liquefaction pilot plant with 0.5 ton/day capacity. The pilot plant has adopted a hydrogen liquefaction process using two-stage helium Brayton cycle with precooling of liquid nitrogen. The cold box for hydrogen liquefaction has generally vacuum insulation but inevitable heat invasion by conduction and radiation exists. The heat loads were calculated for cold box internals according to multilayer insulation emissivity. Total heat load of 181.7 W is estimated for emissivity of 0.03 considered in field condition.

An Experimental Study on the Property Transformation for High-Heated Inorganic Insulation (고온수열된 무기질단열재의 물성변화에 관한 실험적 연구)

  • 김봉주;김태용;오창희
    • Fire Science and Engineering
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    • v.5 no.1
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    • pp.29-36
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    • 1991
  • The purpose of this study is to understand the variations of the properties of matters according to the heated temperature of inorganic insulation. As a result, form the variation of heat conductivity and maintaining from of insulation, the range of reusable heated temperature of inorganic insulation is as follows. Glass wool : $400^{\circ}C$, Rock wool : $600^{\circ}C$, Perlite : $800^{\circ}C$.

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