• Title/Summary/Keyword: Cooling analysis

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Comparative Analysis of Energy Performance of Hydrothermal, Geothermal Source and Hybrid Heat Pump System According to Internal Heat Load for Office, School and Smart Farm (건축물 용도별 내부 발열부하에 따른 수열원, 지열원 및 하이브리드 히트펌프 시스템의 에너지 성능 비교 분석)

  • Park, Sihun;Min, Joonki
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.18 no.3
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    • pp.19-30
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    • 2022
  • In this study, comparative analysis of energy performance in Taebaek city, a test area, by applying hydrothermal, geothermal source and hybrid heat pump system to office, school and smart farms with different internal heat loads. The conclusion is as follows. In the load characteristics by use of buildings, it was found that office had a large cooling load compared to heating load, school had a large heating load compared to cooling load, and smart farm had only cooling load year-round. Performance analysis of the heat pump system in office shows that the cooling COP of the hydrothermal source is 5.12% and the heating COP is 3.22% lower based on the geothermal source, the cooling COP of the hybrid is 0.41% higher, and the heating COP is the difference in performance appeared sparsely. The performance analysis of the heat pump system in school showed that the cooling COP of the hydrothermal source was 10.44% and the heating COP 3.22% lower based on the geothermal source, and the performance difference between the hybrid cooling and heating COP was insignificant. Heat pump system performance analysis in smart farm only occurred with cooling load. Based on geothermal sources, the cooling COP of the hydrothermal source was 46% and the cooling COP of the hybrid was 19.65%, respectively.

Analysis of Flow and Heat Transfer in Swirl Chamber for Cooling in Hot Section (고온부 냉각을 위한 스월챔버내의 유동 및 열전달 해석)

  • Lee Kang-Yeop;Kim Hyung-Mo;Han Yeoung-Min;Lee Soo-Yong
    • 한국전산유체공학회:학술대회논문집
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    • 2002.05a
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    • pp.71-78
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    • 2002
  • All modem, aerospace gas turbines must operate with hot stage gas temperature several hundreds of degrees hotter than the melting temperatures of the materials used in their construction. Complicated cooling schemes need to be employed in the combustor walls and In the high pressure turbine stages. Internal passages are cast or machined into the hot sections of aero-gas turbine engines and air from the compressor is used for cooling. In many cases, the cooling system is engineered to utilize jets of high velocity air, which impinge on the internal surfaces of the components. They are divided by Impinging cooling method and Vortex cooling method. Specially, Research of new cooling system(Vortex cooling method) that overcome inefficiency of film cooling and limitation of space. The focus of new cooling system that improve greatly cooling efficiency using quantity's cooling air which is less is set in surface heat transfer elevation. Therefore, In this study, the numerical analysis have been performed for characteristic of flow and thermal in the swirl chamber and compared with the flow field measurement by LDV. especially, for understanding of high heat transfer efficiency in vicinity of wall. we considered flow structure and mechanism of vortex and heat transfer characteristic in variation of Reynolds number.

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Off-Design Performance Analysis of a Counterflow-Type Cooling Tower (대향류형 냉각탑의 탈설계 성능해석)

  • 신지영;손영석;한동원
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.3
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    • pp.191-198
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    • 2002
  • Cooling tower design procedure was set up using conventional Merkel theory, The design data could be different depending on the characteristic curve that the engineer chose. It reveals that the consistent and reasonable criteria are required based on the exact information of the cooling tower Performance. In this study, an off-design performance analysis program for a counterflow-type cooling tower was developed and verified by comparing with experimental data. Also, the off-design performance with various operating conditions was analyzed.

Analysis oil the Thermal Characteristics of the Spindle with High Frequency Motor according to the Cooling Methods (고주파 모터 내장형 주축의 냉각에 따른 열특성 해석)

  • 김수태;최대봉;조환석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.969-974
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    • 2002
  • Thermal characteristics according to the cooling methods are studied for the three type spindles with high frequency motor. For the analysis, three dimensional mode]s are built considering heat transfer characteristics such as natural and force convection coefficients. Unsteady-state temperature distributions and thermal deformations according to the cooling conditions are analyzed by using the finite element method.

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Design of Cooling System of Over-molding Mold for Socket Component of Automobile Wiper (자동차 와이퍼 소켓 부품 제작용 오버몰딩 금형의 냉각 시스템 설계)

  • Lee, Dong-Gi;Park, Min-Woo;Ahn, Dong-Gyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1635-1640
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    • 2011
  • The objective of this study is to design of a cooling system of the over-molding mold for a socket component of an automobile wiper by performing numerical analyses. Hot spots in which the temperature distributions are higher than those of other region, were estimated by an initial over-molding analysis for the initial design of the mold. On the basis of the initial over-molding analysis, two types of cooling system designs with a linear cooling channel and a volumetric heat sink, were considered to improve the cooling characteristics of hot spots. To obtain an appropriate cooling system design, the effects of the diameter and the position of the linear cooling channels on the cooling characteristics and the product qualities were quantitatively examined. In addition, the effects of the design of the volumetric heat sink on the cooling characteristics and deformation distributions in the molded product were investigated. The results of the over-molding analysis of the two types of cooling systems showed that the multi-sliced over-molding mold with a volumetric heat sink can improve both the product quality and the cooling characteristics of the mold.

Development of simulation program for automotive engine cooling system (엔진 냉각 시스템의 이론적 시뮬레이션 프로그램 개발)

  • Lee, Seung-Hee;Sin, Chang-Hoon;Park, Won-Gyu;Yang, Jang-Sik;Kim, Eun-Pil;Seo, Jeong-Sik
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.341-346
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    • 2000
  • A numerical simulation has been carried out for the engine cooling system. It is the important element to analysis of heat transfer process in cooling system for an automotive engine. Thus, the purpose of this simulator is to present useful information at the early stages of the design of the cooling system by enabling the development engineer to predict performance trends. This program has useful window interface for analysis of the cooling system and it is convenient for user to control data with relational database. The system was simulated and compared with experimental data. As a result, the inlet, outlet temperature of the radiator by the simulator agrees well with it. It is concluded that this simulation program is available in developing the cooling system for a new car.

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Effects of performance analysis of a desiccant cooling system with a direct evaporative cooler in the regeneration process (재생 입구 직접증발냉각기 적용이 제습냉방시스템 성능에 미치는 영향)

  • Dash, Ulziiutas;Oh, Myung-Do
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.633-638
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    • 2009
  • In this study the performance analysis and cooling capacity of desiccant cooling system incorporating regenerative cooler and direct evaporative cooler in the regeneration air inlet were investigated on the condition of low regeneration temperature and time rotation 180s and area ratio of regeneration to dehumidification section 0.7. The cooling capacity and COP are evaluated at various effectiveness values of the direct evaporative cooler or the regenerative evaporative cooler. As either of effectiveness of the regenerative and direct evaporative coolers of desiccant cooling system increases, both the cooling capacity and COP increase, but effectiveness value of regenerative cooler gives the opposite effect on the system performance. It is found that effectiveness of regenerative cooler less than 0.7 shows the optimum cooling capacity.

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Heat Transfer Analysis above L$N_2$ Surface in HTS Transformer (HTS변압기에서 액체질소 표면 상부의 열전달 해석)

  • ;;Steven W. Van Sciver
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.02a
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    • pp.174-177
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    • 2003
  • Cooling load from the top plate to L$N_2$ surface, including wall conduction, gas conduction, radiation, and current leads, is investigated in a closed cooling system for HTS transformer. In general methods of load calculation, individual load is estimated separately, but they are actually coupled each other because of natural convection of nitrogen vapor. Using heat transfer analysis, we calculate cooling load with taking into account the effect of natural convection. Cooling load is under- estimated approximately 2 % when the natural convection is ignored. If the operating current is high, there will be a wide difference between actual cooling load and cooling load by individual calculation. Cooling load decreases with increasing number of radiation shield. With production, construction, and cooling load, three radiation shields are proper to 1 MVA HTS transformer.

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Validation of Gas Turbine Combustor Cooling Design by Conjugate Heat Transfer Analysis (CHT 해석을 통한 가스터빈 연소기 냉각 설계 검증)

  • Shim, Youngsam;Partk, Jungsoo;Kim, Hokeun;Chon, Muhwan;Ryu, Jewook
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.271-272
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    • 2015
  • Gas turbine combustors is critical part due to high temperature operating conditions and the optimization of cooling design is required to avoid combustor failure. In gas turbine combustor, effusion cooling, impingement cooling and thermal barrier coating (TBC) are commonly used to improve cooling characteristics. In conceptual design, these cooling schemes are designed by 1D heat transfer calculation. Therefore, these design should be validated ted by nemurical or experiment methods. In this study, Conjugate Heat Transfer (CHT) analysis is performed for validation of gas turbine combustor cooling design.

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Cooling Performance Analysis of Water-Cooled Large Area Magnetron Sputtering System (대면적 마그네트론 스퍼터링 증착장비의 수냉시스템 방열성능 해석)

  • Kim, Kyoung-Jin
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.2
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    • pp.111-116
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    • 2010
  • In a large area magnetron sputtering system, which is under the influence of high heat load from the plasma, it is necessary to use the effective water cooling in order to maintain the proper deposition performance and the economic use of target materials. A series of three-dimensional numerical simulations are carried out on the simplified model of the large area magnetron sputtering system with the cooling plate that includes the U-shaped water channel. The analysis is focused on the effects of water channel geometry, cooling water flowrate, thermal conductivity of target material, and the degree of target erosion on the cooling performance of cooling plate, which is represented by the temperature distribution of target material.