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Experimental study on drying time and energy consumption of a vented dryer
안승표,김성환,박용갑,하만영 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
A vented dryer is a system in which outside air flows in, and moisture from wet clothes is evaporated using a heat source and discharged directly outside. This study experimentally investigates the thermal characteristics and drying mechanisms of such a dryer along with the main factors that affect the drying performance. The heat and mass transfer coefficients in the drum increased at the beginning of the drying process and gradually decreased due to the reduction of moisture in the clothes. The air entering the electric heater was preheated by heat that leaked from the drum and other parts in the dryer. This phenomenon recovers approximately 5-8 % of the heat. Although the drying time increases when decreasing energy consumption, there is a heating algorithm that can achieve energy-star performance while minimizing the increase in drying time by appropriately setting the heater input at the beginning and end of drying.
원양수,안승표 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.14 No.1
대구시 신천 및 달서천 하수처리장에서 발생되는 하수슬러지 탈수케익의 고형화 특성에 관한 연구를 위해 고화제로 보통 포틀랜드시멘트와 특수(초조강) 시멘트를 사용하였다. 대구시 하수슬러지의 고형화 특성에 대한 영향을 분석하기 위해 배합비, 양생조건, 양생기간을 변화시켰을때의 감용율, 감량율, 압축강도, pH, 재침수율 및 중금속 용출시험의 결과를 통한 적정 처리방법을 검토하였으며 주요 실험결과는 다음과 같다. 기건양생 조건일 경우, 시멘트의 배합비는 높을수록 감용율, 감량율 및 재침수율은 낮게 나타났으나, 반대로 압축강도는 크게 증가하였다. 중금속 (Cu, Pb, Cr, Cd) 용출시험 결과 기준치보다는 낮은 용출농도를 나타내었다. This study was carried out to estimate the solidification characteristics of sewage sludge emitted from Dalseochun and Shinchun Sewage treatment Plant. The solidification binders used were two types, portland cement and special(super high early strength) cement. The solidification tests were conducted to observe reducing weight, reducing volumn, compressive strength, pH of the extract solution, water immersion ratio and concentration of heavy metals leached from cured sewage sludge by varing cement/sludge ratio, curing condition and curing time. In case of dry curing condition, reducing weight, reducing volumn and water immersion ratio decreased, but compressive strength increased significantly as the cement/sludge ratio increased. The concentration of heavy metals (Cu, Pb, Cr, Cd) leached from cured sewage sludge was less than that of standard regulation.
안영철,조재민,이재근,이현욱,안승표,윤덕현,하삼철,강태욱 대한설비공학회 2003 설비공학 논문집 Vol.15 No.6
The air-side particulate fouling in the heat exchangers of HVAC applications degrades the performance of cooling capacity, pressure drop across a heat exchanger, and indoor air quality. Indoor and outdoor air contaminants foul heat exchangers. The purpose of this study is to investigate the cooling performance and pressure drop on the air-side particulate fouling of heat exchangers for air conditioners. Air conditioners being used in the field such as inn, restaurant, and office are collected in chronological used order. Test results show 15% decrease of the cooling capacity and 44% increase of the pressure drop for the 7 years air conditioners used in the seaside inn.