• 전기전자학회논문지
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• 제22권3호
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• pp.645-650
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• 2018

본 논문에서는 옥내 외에 설치 운영되는 수배전반의 결로 현상을 방지하는 IT 기반 자동 온습도 제어기를 설계하고 제작하였다. 이슬 결로점 온도가 실내공간의 습도와 온도로부터 산출되고, 이슬 결로점 온도와 결로 부위의 온도를 비교하여 수배전반의 결로 현상을 방지할 수 있는 시설이 순차적으로 제어 동작되도록 구현하였다. 아울러 원격지의 수배전반의 결로 기반 제어기 동작 상태를 모니터링 할 수 있는 원격 모니터링 장치를 LoRa 무선통신 방식을 사용하여 구현하였다. 제어기와 원격 모니터링 장치를 설치 운영하여 전송되는 데이터의 정확성과 결로 기반 제어기 동작상태의 안정성을 확인하였다. 본 제어 장치는 수배전반 이외에 결로가 발생되는 장비에 설치되어 결로를 방지할 수 있는 장치로 용이하게 활용될 수 있다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.808-812
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• 2008

최근 건축물들이 100층 이상이 되는 Super Tall 추세로 증가되어가면서 자연스럽게 건축의장 부분에서도 변화의 바람이 불고 있다. 기존 건축물들을 구성하던 중량벽체를 대신하여 비내력벽 개념의 커튼월 시스템 사용으로 변화되어가고 있다. 그러나 커튼월 시스템은 건축물의 외부환경인 공기와 빛, 열 등의 요소들로 인해 부하가 많이 발생하며 특히 커튼월 외피부분에 발생되는 결로 문제가 심각해지고 있는 실정이다. 특히 국내 건설시장의 여건 상 건축물들의 밀집화로 인한 통풍량 및 일조량 부족으로 결로발생은 더욱 심각해지고 있다. 하지만 아직까지 결로발생을 검토하는 표준화된 절차가 정립하지 않은 실정으로 건설사업관리자를 위한 결로발생 검토프로세스 마련이 시급하다 할 것이다. 본 연구는 커튼월 시스템의 대표적 타입인 Unitized 시스템과 Stick 시스템 선정하여 동일한 온도에서 상대습도의 변화에 따른 결로 발생범위 및 온도분포를 비교 분석하여 커튼월 결로성능을 평가하고 향후 결로발생 검토프로세스 마련을 위한 기초자료를 제공코자 한다.

• 한국수소및신에너지학회논문집
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• 제22권6호
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• pp.835-841
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• 2011

The humidification is essential for performance enhancement of the electrolysis of PEMFC because proton conductivity depends on hydration of the proton exchange membrane. In this study, the humidification experiment did about On/Off control the humidification and dew condensation for PEMFC by using of the membrane humidifiers. As the results, it was possible to approximation control of the humidity by using of the solenoid valve On/Off control on the membrane humidifier. Also the problem on the dew condensation was resolved by approximation humidity control through solenoid valve On/Off control and the removal of the dew condensation in the flow channel was verified through visualization experiment.

• 설비공학논문집
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• 제15권8호
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• pp.683-689
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• 2003

The thermal comfort of an indoor swimming pool is different from that of general indoor space because of the characteristics of large space and the wear conditions of swimmers. Dew condensation by humid air not only makes mold on the floor, wall and roof but also decreases the durability of buildings by penetrating into their structures. In this study, the characteristics of the flow field, the temperature field and the humidity distribution in an indoor swimming pool have been examined by the numerical method to estimate the level of thermal comfort and the generation rate of dew condensation. The results showed that the dew condensation regions were spread widely at the eastern parts of the swimming pool due to the insufficient air flow rate with low velocity and temperature. To prevent the generation of dew condensation in a region, a sufficient warm air flow rate should be supplied to make an air mixing. The values of PMV at horizontal plane of 1.5 m height have the range of -1.0∼1.2, which means the suitable level for swimmers.

• Architectural research
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• 제10권1호
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• pp.33-39
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• 2008

Condensation has mainly occurred in corridor type apartment door which is exposed to the outside air and is made of steel, which has high thermal conductivity. As a result, the total costs of repair have increased with the number of disputes with residents. In this study, therefore, we investigate materials and construction methods used in apartment door, perform a computer simulation to find out possible improvements, and then suggest the dew point to prevent the occurrence of condensation throughout simulation. The results indicate that the temperature that condensation does not occur is $15.4^{\circ}C$, and the optimum method of achieving this dew point is shown to be a door frame system including a large vertical slot to decrease the area of thermal conduction between the outer and inner portions of the door frame. Mock-up tests show that the surface temperature of the door frame was higher than the dew point, and the system can withstand severe cold conditions of $-20^{\circ}C$. In application test, the surface temperature of door frame with vertical slots is $5.9^{\circ}C$in average, which is higher than the existing door frame. Furthermore, in the temperature distribution of the surrounding door measured with infrared ray camera, the existing door shows the high temperature distribution indicating lack of insulation, but the improved door shows the low temperature distribution indicating higher insulation.

• 한국도로학회논문집
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• 제15권5호
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• pp.187-193
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• 2013

PURPOSES : This research is to analyze the influence in terms of misreading rate and legibility time for drivers when condensation occurs on the road signs. METHODS : In this research, the dew occurred road signs provided to drivers to measure legibility time and misreading rate to compare with normal road sign. In order to identify the difference of legibility time between normal road sign and dew occurred road sign, the T-test and ANOVA test were used. And the vision system was used to recognize the region of dew occurrence on the road sign, then the brightness of dew occurrence region on the road sign was changed to check the misreading rate of drivers according to the change rate of brightness. RESULTS : The legibility times were measured 2.65s for normal road sign and 4.08s for dew occurrence road sign and misreading rates were measured 2.8% for normal road sign, 21.7% for dew occurrence road sign.

• 자원환경지질
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• 제42권1호
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• pp.73-84
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• 2009

화순 운주사 석조불감(보물 제797호)은 고려시대 양식을 갖추고 있는 석조문화재로서 우리나라에서 유래를 찾아볼 수 없는 거대한 석조불감이다. 남쪽과 북쪽의 감실 내부에는 각각의 불상이 등을 맞대고 있는 쌍배 좌상의 독특한 양식을 보이고 있어 역사적, 미술사적 및 학술적으로 높은 평가를 받고 있다. 그러나 이 석조불감은 특별한 보호시설 없이 옥외에 노출되어 장기간 풍화를 받아 다양한 훼손양상이 복합적으로 나타나고 있다. 따라서 상대적인 훼손 및 환경적 요인을 분석하기 위해 석조불감 내부와 외부의 온도분포와 상대습도를 일년간 모니터링 하였다. 이 결과, 석조불감의 기온 및 상대습도 연중변화는 일정한 변동률의 폭으로 증감을 반복하며 기온은 계절에 따라 상승과 감소의 경향을 뚜렷이 보이는 반면, 상대습도는 사계절 모두 높은 습도를 유지하는 것으로 나타났다. 석조불감의 내부는 높은 상대습도로 인해 표면 결로현상이 나타나고 있으며 이는 봄, 여름 및 겨울철에 관찰된다 특히 여름철은 봄과 겨울철의 합보다도 2배정도 높게 나타나며, 기온이 높고 상대습도가 거의 100%에서 일정하게 유지되므로 결로현상이 오랫동안 암석 표면에 지속되어 구성광물을 용해시키고 표면을 변질시켜 화학적 풍화를 촉진시킬 것으로 판단된다. 따라서 이 석조불감의 보존을 위해 결로현상에 영향을 미치는 상대습도의 저감방안이 필요한 것으로 나타났다.

• 설비공학논문집
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• 제25권10호
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• pp.529-533
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• 2013

Heat-recovery ventilators are being adopted in most newly built apartment houses for energy reduction and indoor environment improvement. In winter, however, the dew condensation resulting from the difference between the indoor and outdoor temperatures may reduce the ventilator's performance and threaten the health of indoor residents. This study analyzes the occurrence of dew condensation according to the ventilator's operational conditions and the changes of temperature and products. The experimental results show that condensations is formed at $26^{\circ}C$ and 60%R.H, which is an unfavorable climatic condition, and when the damper is not closed tightly. Therefore it is important to ensure damper performance to prevent back flow.

• 센서학회지
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• 제21권1호
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• pp.21-27
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• 2012

In this study, we designed an embedded system for automatic condensation control(ESCC) of the car. This system heats the car glasses as and when it is needed that makes driving safer and convenient. The system was built on an ATmega128L central processing unit(CPU), using high-performance electrically erasable programmable read-only memory(EEPROM) complex programmable logic device(CPLD) ATF1504AS, using which an ESCC algorithm has been proposed. The source code was written in C language. The algorithm of work was written using the dew-point table. This system not only clears the condensation on the glass but also averts condensation. The designed ESCC system begins working once the input information comes close to the dew-point table information. This device enables a wider field of view, thereby increasing safety.

• 한국환경과학회지
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• 제31권1호
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• pp.43-50
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• 2022

In this paper, lysimeter was installed to analyze the moisture fluctuations on the surface of a forest. The weight of the soil was measured, and the moisture fluctuations were calculated through the difference in weight over time. The amount of dew condensation on the surface of the ground was about 2-7 mm. January experienced the most dew condensation (7.2 mm). It was found that about 43 mm of dew condensation was generated over one year. To analyze the characteristics of evapotranspiration in the forest, the evapotranspiration on the surface was measured by the lysimeter method and the evapotranspiration on the upper part of the canopy was measured by the eddy covariance method. These results were compared and analyzed. Until mid-October, the evapotranspiration of the forest was active, and the amount of evapotranspiration on the top of the canopy was higher than the amount on the surface. Thereafter, the amount of evapotranspiration on the top of the canopy decreased due to the lowering of temperature and net-radiation. The amount of evapotranspiration on the surface and above the canopy showed the same tendency.