• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.28 no.3A
• /
• pp.391-399
• /
• 2008

Because of relatively high temperature, over $240^{\circ}C$, of asphalt for steel deck bridge during pavement procedure, the temperature of deck could rise over $100^{\circ}C$ and undesirable excessive displacement and thermal stress could occur. In this study, in order to estimate the thermal effect of pavement process and to find the optimal pavement process, a new thermal analysis technique with Equivalent Heat Source (EHS) is proposed and its applicability to the practical pavement of steel bridge is studied. EHS is developed to simulate the high temperature pavement materials and its thermal effect such as conduction and convection which cannot be explain easily in general structural analysis program for bridge design. To verify the applicability of new analysis technique with EHS, thermal analyses of steel deck bridge with uplift and curved bridge with various pavement procedures are presented.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.33 no.8
• /
• pp.56-62
• /
• 2004

종래 건축공조시스템의 에너지절감에 관한 연구는 대체로 사무시설이나 상업시설에 관한 것이었고, 산업 시설을 대상으로 진행된 케이스는 극히 적었다고 할 수 있다. 그러나 이번에 귀중한 실측자료를 입수할 수 있는 기회를 가지게 되었고, 이에 본고에서는 산업 시설의 열원 시스템에 도입된 고효율화 기술의 에너지 절감 성능에 대해 실측과 시뮬레이션을 통한 결과를 소개하고자 한다. (중략)

• 주택과사람들
• /
• s.189
• /
• pp.100-107
• /
• 2006

600여 만 평에 걸쳐진 대관령 능선을 따라 아름다운 설원이 펼쳐지는 평창. 이곳을 찾는 사람들은 누구나 영화와 드라마의 잔상을 떠올리며 겨울 동화의 주인공이 되어 돌아간다. 이처럼 설원의 도시, 고원 휴양지로 알려진 평창이 2014년 동계 올림픽을 준비하며 야심찬 계획을 세우고 있다. 과연 평창에는 어떤 움직임이 일어나고 있는지 사뭇 궁금해진다. 강원도 평창, 그 현장 속으로···.

• KOREAN POULTRY JOURNAL
• /
• v.38 no.8 s.442
• /
• pp.103-106
• /
• 2006

여름철만 되면 혹서로 인한 생산성 감소와 심지어 폐사가 속출하는 경우가 빈번히 발생하면서 사양가들은 혹서기 사양관리에 관심이 집중되는 시기이다. 특히 닭은 열에 민감한 동물로 여름철 열차단이 무엇보다 중요한 시점이다. 이에 본고는 7월 11일 서울 성수동에 위치한 전문 단열업체인 세원물산을 방문하여 여름철 단열의 중요성을 알아보았다.

• Journal of Energy Engineering
• /
• v.17 no.3
• /
• pp.167-174
• /
• 2008

Line source model is commonly used in analyzing the data obtained from thermal response test to estimate the effective soil formation thermal conductivity. In the application of line source model some part of initial data must be ignored in order to achieve more accurate result. The period of time for this initial data is called initial ignoring time(IIT) in this paper. However there has been no definite rule in determining this initial ignoring time. Therefore line source model requires experienced analyzer to select the useful data, which is somewhat subjective. One method often suggested is the calculation of IIT with non dimensional time $\tau=5$. However, this is a very theoretical result derived from a system of perfect line source model, which is somewhat different from the real system. A new method to determine IIT is presented in this study. This method requires error estimation first and IIT can be decided from the results of error estimation. This method is applied in the analysis of field test data and shows better result than the one obtained from the method using non dimensional time mentioned above as shown in Table 2.

• Journal of Korea Society of Industrial Information Systems
• /
• v.23 no.3
• /
• pp.25-34
• /
• 2018

This paper presents a heating source of carbon nanofibers for the efficiency and the drying performance of laundry dryer, and focuses on the applicability-evaluation of its source. To design the proposed heating module, experiments were conducted in terms of surface temperature and surface temperature distribution characteristics of carbon nanofiber lamps. The surface temperature of the lamps increased linearly with increment of a current to flow a lamp and revealing the increasing pattern as the length of the ramps is shorter. The proposed heating source was evaluated based on drying efficiency, moisture evaporation rate at laundry, and internal temperature of a drum during drying process. The drying efficiency satisfied a 45% which is specified in KS C 9319. The moisture evaporation rate and the internal temperature of the drum were respectively 98.88% and $61.1^{\circ}C$, which are similar to that of S's company dryer. From the evaluation and actual drying test results, the proposed carbon nanofiber lamp heating module is considered to be applicable as a heat source for laundry dryer in terms of drying efficiency and drying performance. it is possible to obtain a heat source at a high temperature, an excellent calorific value, an improvement in drying performance, and an effect of sterilizing laundry due to the emission of far-infrared rays. In addition to the applicability, the difference of the drying efficiency between the dryers was analyzed in detail based on the power consumption of the heat sources.

• Journal of the Microelectronics and Packaging Society
• /
• v.12 no.3 s.36
• /
• pp.243-251
• /
• 2005

The distribution of temperature of flip chipped device with peripheral solder bump array was measured with variables, such as the locations and geometries of heater, the size of device, the size of passivation opening. The highest temperature was measured with the larger device, $3.0(mm)\times3.0(mm)$, which has the smallest heater at the center of device and the circular passivation opening. For 2 (watts) power input, the device shows the highest temperature of about $110(^{\circ}C)$. In contrast, the smaller device, $1.5(mm)\times1.8(mm)$, shows that of $90(^{\circ}C)$. In addition to the size effect, the increase of passivation opening size decreased the maximum temperature by about $10(^{\circ}C)$. From the measurement, the temperature of device could be controlled with the size and geometry of heater, the size of device and the size and geometry of passivation opening.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.8 no.2
• /
• pp.255-262
• /
• 1998

This study investigated the crystallization behaviour of sealing amorphous material heat-treated by conventional and microwave heating source. From X-ray diffraction and SEM analyses, it was shown that microwave heat-treated sample had well-grown $PbTiO_3$crystals and the high degree of crystallinity inspite of its heat-treated condition of shorten time and lower temperature as compared with a conventionally heat-treated sample. It was assumed that microwaves inhibit the nucleation of $PbTiO_3$crystal in nucleation stage, but promote the growth of $PbTiO_3$crystal above the critical size of crystal due to enhanced diffusion effect within the sample.

• Journal of the Korean Institute of Gas
• /
• v.4 no.4 s.12
• /
• pp.13-19
• /
• 2000

Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was performed as follows The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.23 no.3
• /
• pp.96-102
• /
• 2019

The study of thermal effect on the structure is carried out in the case of Guss asphalt which is paved at the temperature of $240^{\circ}C$ or higher in the bridge pavement of the steel deck bridges. However, studies on the heat source data applicable to numerical analysis are insufficient, the temperature load is used as a joint load. In this study, the heat source equations that can be directly loaded on the plate elements, although limited, are presented using the measured temperature data in the Guss asphalt pavement and its validity is confirmed by a brief numerical analysis.