• Title/Summary/Keyword: 가스쿨링

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Development of Subminiature Type 3 Composite Pressure Vessel for Cooling Unit in Electric Appliances (전자제품 쿨링 유닛용 초소형 타입 복합재 압력용기 개발)

  • Cho, Sung-Min;Lee, Seung-kuk;Moon, Jong-sam;Lyu, Sung-ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.6
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    • pp.151-157
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    • 2018
  • In this study, we have developed a composite pressure vessel that is compact and can store refrigerant at high pressure to increase the refrigerant volume. The composite pressure vessel is made of aluminum-based duralumin, which has high rigidity and excellent elongation in the inner liner, considering the characteristics of products in the aerospace and defense industry, where the safety of the applied product is considered as a priority. High strength carbon fiber was applied to the outside. In order to evaluate the performance of the developed product, burst test and cycling test were carried out. In burst test, an excellent safety margin equivalent to 2.7 times the operating pressure was obtained. In cycling test, a stable failure mode in which 'pre-burst leak' occurs is proved and the soundness of the product is proved.

Experimental Study on the Secondary Flow Characteristics of a Supercritical Carbon Dioxide Flow in a Gas Cooling Process Within a Square Duct (정사각 덕트 초임계 상태 이산화탄소 가스 냉각과정 중 2차 유동 특성 측정 연구)

  • Han, Seong-Ho;Seo, Jung-Sik;Kim, Young-Chan;Kim, Min-Soo;Choi, Young-Don
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.2
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    • pp.158-165
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    • 2008
  • The carbon dioxide properties change sharply near the critical or pseudo-critical point in the heat transfer processes. The reduction in turbulent, convective heat transfer parameters observed in some supercritical data and in experiments with common gases can be due to property variation, acceleration, buoyancy or combinations of these phenomena, depending on the conditions of the applications. In this study, the measurement for the secondary flow driven by buoyancy was carried out on the supercritical carbon dioxide turbulent flows in the different boundary condition with the constant mass flow rate. The available measuring techniques were used to clarify the behaviour of any supercritical fluid. Laser Doppler Velocimeter (LDV) and a special device was used to measure the secondary velocity and turbulent characteristics of the supercritical flows.

Prediction of 123I production using the monte Carlo code MCNPX (몬테 칼로 전산코드 MCNPX를 이용한 I-123 생산량 예측)

  • Yoo, Jae jun;Kim, Gyehong;Kim, Byung il;Lee, Donghoon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2014.05a
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    • pp.816-818
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    • 2014
  • Gas target chamber has been developed for producing $^{123}I$ which is radiopharmaceuticals for diagnosis of thyroid cancer, and modeled how to occur nuclear reaction between chamber and $^{124}Xe$ with energy 30MeV inside the gas target chamber by using the MCNPX. The beam energy was lost as the beam spread when beam hit inside the gas target chamber. The cooling water was used not to change the gas target chamber as loss of energy transfer to the thermal energy. Spiral cooling line was designed for cooling the target chamber efficiently. By using the c30 cyclotron, $^{124}Xe(p,2n)$, $^{124}Xe(p,n)$, $^{124}Xe(p,pn)$ nuclear reactions were studied. In this study, we predict the production yield.

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An investigation on development of bus electrical cooling fan system (상용차용 전동 쿨링팬 개발에 관한 연구)

  • Kim, Joo-Han;Jung, In-Soung;Seo, Jung-Moo;Hur, Nahm-Keon;Jung, Jae Hyuk
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.144.1-144.1
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    • 2010
  • 현재의 세계 자동차 시장은 석유 자원의 고갈과 전자화로 높은 연비의 기술적 성숙을 요구하고 있으며, 이는 미래 자동차 기술의 전동화를 가속시키고 있음에 따라 종래 엔진부하로 사용되는 시스템 및 유압시스템의 전동화 기술추이가 지속적으로 증가하고 있다. 이중 엔진 부하 메커니즘의 하나인 엔진 쿨링 팬 분야는 소비용량이 크고, 고 연비증감 기술증진의 전동화에 따른 차량 성능개선의 효과가 높아 실용 전동화 용의성에 의해 새로운 최우선 차량 전동부하로 나타나고 있다. 특히, 대형 차량(버스, 트럭)의 엔진 Cooling Fan 시스템은 차량 연비저감의 주요원 중에 하나로 대두되고 있으며, 도시 소음의 주된 요인이 되고 있어 전동화 기술개발의 필요성이 매우 높다. 전동 Cooling Fan 시스템은 종래 엔진 구동형 시스템에 비하여 엔진부하를 감소시킬 수 있고, 차량 연비향상 및 유해배출 가스를 저감시킴으로 기술적, 환경적 개발효과가 매우 높다. 본 연구에서는 쿨링팬 고출력 BLDC모터 설계제작에 관한 내용과, 최적 팬 블레이드 설계제작, 마지막으로 개발 전동 쿨링팬 성능평가에 관한 내용이 포함되어 있다.

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Fabrication of Electrospun Composite Membranes with Silk Powder (실크 입자가 도입된 전기방사 복합막 제조)

  • Seo, Young Jin;Kang, Hoseong;Im, Kwang Seop;Choi, Kang-min;Park, Chi Hoon;Nam, Sang Yong;Jang, Hae Nam
    • Membrane Journal
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    • v.32 no.2
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    • pp.133-139
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    • 2022
  • As the issue of reducing greenhouse gases is emerging due to global warming and extreme weather, research on materials capable of radiative cooling without energy consumption is being actively conducted. Among them, silk is known as a natural self-cooling material, but in the conventional mixing process using chemically powdered silk, there is a problem that the radiative cooling effect disappears by the collapses of the intrinsic crystal structure of silk fibroin, so it is difficult to manufacture it in the form of a film or coating agent for radiative cooling. In this study, various types of membranes were manufactured using silk powder that went through a physical pulverization process that does not damage the intrinsic structure of silk fibroin, and the study was conducted to examine its applicability as a coating agent. Electrospun membranes and flat sheet membranes were prepared by using silk fibroin powder for this purpose, and it was observed that the viscosity of the solution had a significant effect on the membrane fabrication and its properties.

Study on Ventilation Efficiency of a Mechanically Ventilated Broiler House­(I)Summer Season (강제환기식 육계사내의 환기효율성 조사연구­(I)하절기)

  • 이인복;정문성;유병기;전종기;김경원;이승기
    • Journal of Animal Environmental Science
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    • v.9 no.2
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    • pp.103-112
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    • 2003
  • In this study, the distributions of internal climates such as air temperature, humidity, dust, ammonia gas, and air velocity were systematically measured at a mechanically ventilated broiler houses during summer season, with local weather data. The analysis was focused on the suitability, stability, and uniformity of internal climate, resulting in serious stress on chickens and decrease of productivity In the mechanically ventilated broiler house, the difference between measured and recommended air temperatures(suitability) was 10.4C in maximum during the summer time. The difference of air temperature in the house between day and night was $8.7^{\circ}C$ in maximum. And maximal hourly range of internal air temperature at 0.4m height from the floor was $3.7^{\circ}C$ suggesting it maintained thermal uniformity in the broiler house. The $NH_3$ and dust concentrations were pretty low because ventilation was fully performed. The air speed at chicken location was measured 2.2m/s and 1.7m/s, respectively without and with chicken existence.

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