건물 에너지 절약을 위한 저류 옥상 녹화의 온도 저감 효과

윤석환,김은섭,박정강,김상혁,김나연,황혜미,제상우,강한민,함은경,이동근 한국환경복원기술학회 2023 한국환경복원기술학회지 Vol.26 No.4

Despite countries' efforts to reduce carbon emissions, carbon emissions have increased in recent decades along with energy use, of which building energy uses account for a large proportion. Energy savings are essential as a strategy to reduce carbon emissions in existing buildings. The field experiment on the roof of a building located in Seoul was designed to measure the temperature reduction effect of green roof with rainwater storage tank to reduce cooling energy consumption in summer. The results showed that the mean mean surface temperature under the green roof was 14.77 degrees lower than that of the non-green roof from 13:00 P.M. to 15:00 P.M., which would have a great effect on reducing cooling energy. From 01:00 A.M. to 03:00 A.M., the effect was 3.36 degrees, showing that tropical nights could be improved. The temperature reduction effect due to the rainwater storage system increased by 1.45 degrees during the day and decreased by 0.63 degrees at night. The storage system can be strategically utilized to reduce carbon emissions during the week when cooling energy increases significantly.

가로수와 바닥 포장 표면 알베도의 도시 열 환경 개선 효과

김나연,김은섭,윤석환,박정강,김상혁,남상준,제화준,이동근 한국환경복원기술학회 2023 한국환경복원기술학회지 Vol.26 No.1

Due to climate change and urbanization, abnormally high temperatures and heat waves are expected to increase in urban and deteriorate thermal comfort. Planting of street trees and changing the albedo of urban surfaces are the strategies for mitigating the thermal environment of urban, and both of these strategies affect the exposure and blocking of radiative fluxes to pedestrians. After measuring the shortwave and longwave radiation according to the ground surface with different albedo and the presence of street trees using the CNR4 net radiometer, this study analyzed the relationship between this two strategies in terms of thermal environment mitigation by calculating the MRT(Mean Radiant Temperature) of each environment. As a result of comparing the difference between the downward shortwave radiation measured under the right tree and at the control, the shortwave radiation blocking effect of the tree increased as the downward shortwave radiation increased. During daytime hours (from 11 am to 3 pm), the MRT difference caused by the albedo difference(The albedo of the surfaces are 0.479 and 0.131, respectively.) on surfaces with no tree is approximately 3.58℃. When tree is present, the MRT difference caused by the albedo difference is approximately 0.49℃. In addition, in the case of the light-colored ground surface with high albedo, the surface temperature was low and the range of temperature change was lower than the surrounding surface with low albedo. This result shows that the urban thermal environment can be midigate through the planting of street trees, and that the ground surface with high albedo can be considered for short pedestrians. These results can be utilized in planning street and open space in urban by choosing surfaces with high albedo along with the shading effect of vegetation, considering the use by various users.

관수조절에 의한 벽면녹화의 냉각효과 분석 연구 - 아이비, 수호초를 식재한 모듈형 벽면녹화를 중심으로-

김은섭 ( Kim Eun-sub ),윤석환 ( Yun Seok-hwan ),박정강 ( Piao Zheng-gang ),전윤호 ( Jeon Yoon-ho ),강혜원 ( Kang Hye-won ),김상혁 ( Kim Sang-hyuck ),김지연 ( Kim Ji-yeon ),이용구 ( Lee Young-gu ),이동근 ( Lee Dong-kun ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.6

Green facade has a significant impact on building’s energy performance by controlling the absorption of solar radiation and improving outdoor thermal comfort through shading and evapotranspiration. In particular, since high-density building does not enough green space, green facade, and rooftop greening using artificial ground plants are highly utilized. However, the level of cooling effect according to plant traits and irrigation control is different. Therefore, in this study, the cooling effect analyzed for a total of 4 cases by controlling the irrigation condition based on hedera and spurge. Although hedera under sufficient water had the highest cooling effect(-2℃~-4℃), had the lowest cooling effect under non-irrigation(+1.1℃~+4.4℃). In addition, hedera under sufficient water had cooling effect than hedera under non-irrigation(-1℃~-8.1℃) and in the case of spurge, it had cooling effect(-0.3℃~-7.8℃) more than non-irrigation. As a result of measuring the amount of transpiration according to the light intensity (PAR) and carbon dioxide concentration conditions, transpiration of hedera was higher than the spurge (respectively 0.63204mmolm^-2s^-1, 0.674367mmolm^-2s^-1). The difference in the cooling effect of the green facade under irrigation condition was significant. But the potential cooling effect of green facade according to plants species was different. Therefore, in order to maximize and continuously provide the cooling effect of green facade in urban areas, it is necessary to consider the characteristics of plants and the control of water supply through the irrigation system.

빗물 저류 시스템을 활용한 옥상 녹화의 온도 저감 효과

윤석환 ( Yun Seok-hwan ),김은섭 ( Kim Eun-sub ),박정강 ( Piao Zheng-gang ),전윤호 ( J Eon Yoon-ho ),강혜원 ( Kang Hye-won ),김상혁 ( Kim Sang-hyuck ),김지연 ( Kim J I-yeon ),강한민 ( Kang Han-min ),함은경 ( Ham Eun-kyung ),이동근 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.6

Thermal environment of city is getting worse due to severe urban heat island caused by climate change and urbanization. Green roof improves the urban thermal environment and save the cooling energy in buildings. This study presented a green roof combined with a storage system that stores rainwater and supplies water through a wick and evaluated the temperature reduction effect as surface temperature and amount of evapotranspiration. For about a week, the surface temperature using a infrared thermal imager and the evapotranspiration by recording change of module weight were measured at intervals of 30 minutes from sunrise to sunset. The results show that the mean surface temperature of the green roof was 15.4 degrees lower than that of the non-green roof from 12:00 P.M. to 14:00 P.M. There was no significant difference between mean surface temperature of green roof with and without storage system immediately after rain, but more than a week after rain, there was a difference with average of 2.49 degrees and maximum of 4.72 degrees. The difference in daily amount of evapotranspiration was measured to be 1.66 times on average. As drought stress increased over time, the difference in daily amount of evapotranspiration and surface temperature between with/without storage system increased simultaneously. The results of the study show a more excellent cooling effect of green roof combined with the rainwater storage system.

인체 조골세포 MG-63 세포증식에 미치는 생약초 추출물의 효과

이숙영 ( Sook Young Lee ),장은숙 ( Eun Sook Jang ),진승찬 ( Seung Chan Jin ),박정강 ( Zheng Gang Piao ),박상혁 ( Sang Hyeok Park ),김수관 ( Su Gwan Kim ) 조선대학교 치의학연구원 2011 Oral Biology Research (Oral Biol Res) Vol.35 No.1

In the present study we investigated the proliferative effect of human osteoblast MG-63 cell treated with 8 spp. medicinal plant extracts to screen the active compounds. Plant extracts were prepared by ethanol extraction method from Carthamus tinctorius seeds, Rhynchosia volubilis seeds, Camellia japonica leaves, Acanthopanax senticosus root and wood, Eucommia ulmoides bark, Chaenomeles sinensis flesh, Sambucus sieboldiana stem, Achyranthes japonica whole plant. A osteoblast proliferation test was conducted by MTT assay on 24 wellplate. Among 8 extracts, R. volubilis seeds and C. japonica leaves showed relatively strong stimulatory activity on osteoblast proliferation at the concentration of 12.5-200 /mL. Also Chaenomeles sinensis flesh, Sambucus sieboldiana stem, Achyranthes japonica whole plant showed cell viability of above 80% at the concentration of 25 /mL. These results suggested that 3 extracts may have beneficial effects on alveolar bone health through the proliferation of osteoblast cells.