• 제목/요약/키워드: Korea temperature

검색결과 31,806건 처리시간 0.056초

산화 알루미늄 및 냉각거울 노점계의 온도 의존성에 관한 연구 (The Effect of Temperature on Aluminum Oxide and Chilled Mirror Dew-point Hygrometers)

  • 김종철;최병일;우상봉;김용규;이상욱
    • 센서학회지
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    • 제26권1호
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    • pp.50-55
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    • 2017
  • The measurement of absolute humidity of gases is essential in many industries. The effect of temperature on aluminum oxide and chilled mirror dew-point hygrometers is investigated. The temperature of laboratory, pipe line, and sensor is varied and the dew point is measured by two different aluminum oxide hygrometers. In all cases, the dew point of hygrometers is increased as the temperature is elevated. The reason behind this observation is due to desorption of water from the inside of pipe line and/or sensor surroundings at elevated temperature that result in the increase of the absolute humidity. Moreover, the sensor itself shows a certain degree of temperature dependency in sensing the humidity especially at low temperature. It is also studied that chilled mirror dew-point hygrometer may indicate a higher dew point than the reference at high temperature because the cooling capability of mirror is decreased at high temperature. Our study will provide evidences in the incorporation of the temperature effect as uncertainty factors in the standard calibration procedure for dew point hygrometers.

온도 측정과 분석을 통한 40 mm 장축공동실린더의 열적특성 고찰 (Thermal Property Analysis of 40 mm Long Hollow Cylinders Though Measurements and Analysis of Transient Temperatures)

  • 신내호;정동윤;오명호;유삼현;남석현
    • Tribology and Lubricants
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    • 제22권4호
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    • pp.190-195
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    • 2006
  • A simple and effective analysis method is presented for gaining a complete transient temperatures on the internal and external surfaces of a 40 mm gun tube subjected to a series of rapid firings. Two series of temperature data for both Hs and As were measured by using two rapid response k-type surface thermocouples near the firing origin and the muzzle. With other available temperature data, patterns of temperature variations of the gun tube as a function of time variable were driven through complete evaluations of the data. It is found that overall temperature gradients which increase exponentially toward saturation temperature, actually consist of a series of linear temperature gradients corresponding to the firing sequences. Under the similar firing sequences, patterns of temperature variations fur both the surface temperatures near the chamber and those near the muzzle were found to have linear temperature gradients with different values and the same response frequencies, i.e. they had peaks and lows in temperatures at the same time. The resultant complete temperature data can be used as the fundamental bases for analysis of thermoelastic properties of the materials such as thermal strain and stress, and f3r the prediction of cannon tube life-time through calculation of wear rate.

대한민국 주요도시의 최고온도 및 최저온도 발생시각 산출 (The Calculation of the Maximum and Minimum Temperature Times for Korea Major City.)

  • 노경환;이관호;유호천
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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    • pp.63-68
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    • 2008
  • Efforts tp overcome the current challenge of global warming and abnormal temperature are being taken around the world. According to a report, average temperature of Korea has increased by about $0.8^{\circ}C$ for a century. In particular, temperature has rapidly increased since year 2000. Climate changes have brought remarkable changes in our lives. For example, agricultural field will see changes in crops and production. Energy used to maintain and manage architectures will be changed as well. In order to actively cope with rapidly changing global climate which drives changes from the basic behavior of our lives to subtle changes, international cooperation and researches are performed around the word. For instance, as a part of these global efforts, research on typical meterological data for computer simulation program to evaluate architecture energy performance is in progress in Korea. In order to conduct research on typical meterological data in format of data per time, reference regarding monthly maximum/minimum temperature time is required. Unfortunately, however, reference regarding maximum/minimum temperature time hasn't been defined in Korea. Therefore, this study aims to provide fundamental data essential for various researches by calculating maximum/minimum temperature time of major cities across Korea. According to the study, maximum temperature occurs at 3 p.m and minimum temperature occurs at 5 a.m or 6 a.m. respectively, in overall areas.

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온도규격 설정을 위한 동아시아 온도 분석연구 (A Temperature Analysis Study of East Asia for Generation of Temperature Specification)

  • 김인수;강치우
    • 한국군사과학기술학회지
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    • 제5권3호
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    • pp.11-22
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    • 2002
  • In this paper, a statistical meaning that the 1% frequency value which is used as a basis for the temperature specification generation for weapon systems is similar to $3{\sigma}$ frequency value of a year is presented, and the theoretical reference for temperature specification generation is made. The new method which extracts the 1% frequency value from general weather data, not depending on long term temperature hour data, is established, and the temperature analysis result of East Asia is also presented by using this method. On the basis of these result, operational temperature for the weapon systems to be used in the area of East Asia is recommended.

창원지역의 지중온도 예측에 관한 연구 (The Study on the Prediction of Underground Temperature in Changwon District)

  • 조성우;임병찬
    • 설비공학논문집
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    • 제26권3호
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    • pp.97-102
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    • 2014
  • For an analysis of the horizontal-type geothermal heat exchanger system, an understanding of the ground temperature distributions is required in order to predict system performance. Because it is difficult to decide on the underground temperature due to the adjustment of its temperature cycle, numerous calculations are required in order to decide on the temperature cycle. In this paper, Buggs formula is utilized to decide a phase shift for outdoor temperature and ground surface temperature, which are obtained from Korea Meteorological Administration. Overall, the underground temperature distribution in the Changwon region is predicted as $10.5^{\circ}C{\sim}20.3^{\circ}C$ at a depth of 3 m.

초기양생온도에 따른 시멘트 모르터의 강도발현에 관한 기초적 연구 (A Fundamental Study on the Strength Development in Cement Mortar under Initial Curing Temperature)

  • 백민수;이영도;임남기;김성식;이종균;최문식;정상진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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    • pp.157-165
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    • 1997
  • In this experiment, there is a purpose to analysis the relationship of feature of compressive strength after fixing of remarkable element under the condition of initial curing temperature. According to this experiment, we get to the fallow result. In case of highest curing temperature, 3-day-strength become high but last revelation of strength become low among the condition of initial curing temperature, the highest curing temperature have an effect on revelation of strength by the application of cumulative temperature, we can get the shape of revelation of strength.

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적외선 화상처리 장치를 이용한 건조초기 목재 표면 온도 측정 (Measuring Temperature on Wood Surface at the Beginning of Drying Using IR Image Measuring System)

  • 이관영;강호양;이민경
    • 한국가구학회지
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    • 제17권3호
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    • pp.79-85
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    • 2006
  • Temperature of board surface was monitored during drying using an IR image measurement system. Boards were water-saturated and dried at the levels of four temperatures and three air velocities. At higher DB the surface temperature increased more steeply and level off period was significantly short. At the DB temperatures of 70, 80, $90^{\circ}C$ the period where the surface temperature was equivalent to WB temperature was constant regardless of air velocity while at $60^{\circ}C$ it decreased as air velocity increased. It was confirmed that a surface transfer coefficient increased with DB temperature. Variation of temperature profile on a wood surface increased with DB temperature and air velocity.

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고온에서의 비선형 변형도를 고려한 콘크리트 구조물에서의 열응력 분포 (Thermal stress of concrete structure at high temperature considering inelastic thermal strain change)

  • 강석원;홍성걸;신영수
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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    • pp.1145-1150
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    • 2000
  • Concrete behaves as ductile material at high temperature. The existing stress-strain relationship is not valid at high temperature condition. Thus, stress-strain curve of concrete at high temperature is re-established by modifying Saenz's suggestion in this study. A constitutive model of concrete subjected to elevated temperature is also suggested. The model consists of three components; free thermal stain, mechanical strain and thermal creep strain. As the temperature increase, the thermal creep becomes more critical to the failure of concrete. The thermal creep strain of concrete is derived from the modified power-law relation for the steady state creep. The proposed equation for thermal creep employs a Dorn's temperature compensated time theorem

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톱밥보드로 제조된 우드세라믹의 표면온도 변화 - 수지 함침율과 소성온도의 영향 - (Change in Surface Temperature of Woodceramics Manufactured by Sawdust Boards - Effect of the Rate of Resin Impregnation and Burning Temperature -)

  • 오승원;박금희;변희섭
    • 임산에너지
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    • 제22권1호
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    • pp.24-29
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    • 2003
  • 낙엽송 간벌재 톱밥보드로 우드세라믹을 제조한 후 수지함침율 및 소성온도에 따른 우드세라믹의 표면온도 변화를 조사하였다. 히터의 표면온도가 증가함에 따라 우드세라믹의 표면온도도 급속히 증가하였으며 수지함침율 70∼80%, 소성온도 800∼1000℃ 조건으로 제조된 우드세라믹의 표면 온도가 상대적으로 높았다. 히터의 표면온도보다 우드세라믹 표면온도의 하강속도가 느려 우드세라믹이 오랜 시간 열을 유지하고 있음을 알 수 있었다.

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반도체 공정용 저온 열처리로의 고효율 냉각시스템 설계에 관한 연구 (Study on Design of high Efficient Cooling System for Low Temperature Furnace in Semiconductor Processing)

  • 정두원;서민석;김광선
    • 반도체디스플레이기술학회지
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    • 제9권4호
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    • pp.71-76
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    • 2010
  • According to recent changes in industry for semiconductor devices, a low-temperature treatment has become a necessity. These changes relate to size refinement and the development of new materials. While variation in cooling efficiency does not affect the yield when using a high-temperature treatment, uniform cooling efficiency is necessary avoid "inconsistencies/bends" in low temperature treatments. However it is difficult to increase temperature stabilization in low temperature treatments. In this paper, using CFD (Computer Fluid Dynamics), we analyze and manipulate the design and input of the low-temperature system to attempt to control for temperature variations within the quartz tube, of which airflow appears to be a predominant factor. This simulation includes variable inputs such as airflow rate, head pressure, and design manipulations in the S.C.U. (Super Cooling Unit).