도심부와 교외지역의 장 · 단파 복사와 상관도 분석 (Ⅰ)

최동호(Choi, Dong-Ho),이부용(Lee, Bu-Yong) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.4

The objective of this study was to compare and analyze for seasonal long·short-wave radiation characteristics between downtown area and suburban area in Daegu through field observations. This study was confirmed the regional and seasonal radiation environments and it can utilize as basic data for the analysis of the urban radiation environment and the effects of urbanization. The followings are main results from this study. 1)The downward shortwave radiation showed the similar value of the radiation generally in the downtown area and the suburban area of the city during the winter and summer season. but, long-wave radiation is always higher in downtown area. 2) In case of the long-wave radiation at two stations, we observed 230∼270W /㎡ in the winter season and 415∼470W /㎡ in summer season. As a result, we can see summer season is higher than winter about two times in long - wave radiation. 3)In case of short wave radiation, there is high correlation between two stations in winter season but very low correlation between two stations in summer season because of local atmosphere unstability and etc.

대구지역의 고도와 위치에 따른 하절기 장·단파복사 관측과 해석

최동호,이부용,오호엽 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.4

This study for the understanding of the radiation environment according to the altitude in urban area in the summer observes the long and short wave radiation environment at the 4 urban areas with different height and the 1 suburban area. The results of this study are as follows. (1) When the altitude was high, the more short wave radiation was observed. (2) As the altitude was high, the temperature of atmosphere got lower. And because of that the downward long wave radiation was also lower. This general trend was confirmed through the study. (3) Through the observation of long wave radiation, the upper atmosphere of suburban area had the at mosphere characteristic which the temperature was rising and decreasing faster. Therefore, the difference radiation characteristics between the urban and suburban area were confirmed. (4) The result of the ratio of short wave radiation to long wave radiation(short wave radiation/long wave radiation) according to the altitude and location, the value was increased when the distance was far from the artificiality structure or a heat source, and the urban effect became smaller. Thus, it is expected that the ratio will be an evaluation index for evaluating urbanization effect.

하계 그늘쉼터 유형별 장·단파복사 관측과 해석

백창현,최동호,이부용,이인규 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.6

In this study, we analyzed the relationship between five factors: long-wave radiation, short-wave radiation, cloudiness, SVF and summer shelters. In the previous study, we recognized the correlation between single building SVF and long-wave radiation. Furthermore, this study attempted to confirm the relationship at the summer shelter with high solar radiation blocking rate. The observations are as follows. ① Cooling in summer shelters was not the effect of temperature but the effect of radiation reduction due to short-wave radiation shielding. ② In the case of the canopy tent with low heat capacity, the long-wave radiation was observed to be 16.7% higher per hour than the comparison control point due to the increase in surface temperature. ③ The long-wave radiation increase rate was different according to SVF, but showed very similar pattern according to the material characteristics of the summer shelters. ④ Passive Cooling effect on the type of summer shelters are determined by the size of the total long and short-wave radiation at that point.

하절기 대구지역의 대기상태에 따른 장파복사 특징 분석

백창현(Baek Chang-Hyeon),최동호(Choi Dong-Ho),이부용(Lee Bu-Yong),이인규(Lee In-Gyu) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.5

The purpose of this study is to analyze the urban heat island ultimately by analyzing long-wave radiation which is the dominant factor of night minimum temperature formation. We observed during two months with four elements which is long and short wave radiation, temperature, relative humidity. And we analyzed the correlation between the four factors of long-wave radiation, temperature, cloud form, and cloud amount during the summer two months on the night time. Observations were carried out at two sites in Daegu and nearby. The results are as follows. ① Long-wave radiation change per 1°C in summer was larger than winter. ② Long-wave radiation amount is affected by temperature change when the amount of cloud is small. ③ Low cloud was analyzed to have more influence on long-wave radiation than high cloud.

대구 도심과 인근 교외지역의 하절기 복사 성분 특성 연구

최동호(Choi Dong-Ho),이부용(Lee Bu-Yong),오호엽(Oh Ho-Yeop) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.1

The objective of this study was to compare and analyze of radiation environment between downtown and suburban area by observation of short, diffuse and long-wave radiation during summer season. The followings are main results from this study. 1) The trends of long-wave radiation is increasing from May to August and the variation of daily range is decreased. It is confirmed that the temperature was closely relevant to long wave radiation. 2) During observation period, suburban area is higher than downtown the value of direct solar radiation. 3) There are much direct solar radiation in suburban area than downtown. But, it was measured much more horizontal solar radiation at the downtown area. From the this result, we can conclude that diffuse radiation play a important role at horizontal solar radiation.

하절기 도시의 지역별 장 · 단파복사 특성 분석과 해석

정임수(Jung Im-Soo),최동호(Choi Dong-Ho),이부용(Lee Bu-Yong) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.3

The objective of this study is to analyze the characteristic of radiation environment in the urban and rural through the field observation in the summer. The radiation balance was compared through the measurement of the shortwave radiation and long-wave radiation in the urban, sub-urban, and rural. The following conclusion could be obtained from this research. (1) In the results of observation including the rain-day, it was found that the short wave radiance in the urban is lower about 10% than the rural. (2) The upper part of atmosphere layers in the urban area absorb much short wave radiation energies compared with the rural relatively. It can increase the temperature of the upper part of atmosphere layers and the emittance of long wave radiation. (3) The ratio of the downward short wave radiation to the downward long wave radiation was 1.24 for the urban, 1.28 for sub-urban and 1.35 for rural. It can be estimated that the atmosphere condition of the rural is better than that of other areas. (4) The net radiation of the rural was lower that of the urban. It was found that the energy in and outflow of the rural is easier than that of the urban. (5) The temperature variation for the long-wave radiation change of the rural showed more sensitive than that of the urban. It was came from the radiation characteristics of the surrounding environment and can be used as the important index to evaluate the thermal environment characteristic of urban.

동절기 대구지역의 기상요소와 장파복사 특성 분석

백창현,최동호,이부용,이인규 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.6

Interpretation of relevance between long-wave radiation and meteorological elements is recognized as an essential element for understanding the underlying mechanism of urban thermal environment formation. In this study, we analyzed relation between three elements : long-wave radiation, temperature, and lower-middle class cloudiness. The correlation was analyzed through field observations. The results are as follows. ① Temperatures and long-wave radiation increased from January to March. This phenomenon has been confirmed in urban and suburban areas. ② Long-wave radiations showed a tendency to increase clearly with increasing cloudiness.

대구지역의 하절기 장·단파복사 관측

오호엽(Oh Ho-Yeop),최동호(Choi Dong-Ho),이부용(Lee Bu-Yong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3

This study observed downward long and short-wave radiant environment with selecting 4 areas which have different height in downtown and 1 suburban area to figure out the characteristic of radiant environment in each altitude. The purpose of this study is to collect the preliminary data for interpreting urban thermal environment in summer season by analyzing thermal characteristic of atmosphere in the upper of downtown. The results of this study are as follows. 1)The higher altitude has the lower temperature, and temperature difference was more huge in day time than night time. 2) The short wave radiation according to altitude was higher as altitude was high. 3) Generally, the higher altitude has the lower air temperature, and also the higher altitude has the lower downward long wave radiation by the atmospheric radiation. 4) The ratio short wave radiation of long wave radiation was lower as altitude was high. And the urbanization effect was higher as the ratio was low.

하절기 도시 유형별 복사특성 관측과 분석

최동호(Choi, Dong-Ho),이부용(Lee Bu-Yong),정형세(Jeong Hyeong-Se) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.2

The purpose of this study is to understand the characteristics of urban climate in several cities, from observing radiation according to wavelength band(UV, short and long wave radiation). Observation start from 5 May to 31 August 2013. The followings are the main results from this study. 1) In every observation area, greater amounts of short-wave radiation have been recorded in May compared to June. Even though the highest solar elevation occurs in June, May sees clearer days, which has attributed to the outcome. 2) The analysis concerning the correlation between ultraviolet radiation and shortwave radiation have revealed that regions closer to the Daegu area have stronger correspondence. 3) The time series of daily long-wave radiation shares a similar tendency with the time series of air temperature, and the maximum value was recorded at 14:00 and 15:00.

대구지역의 하절기 운량과 장·단파 복사 특성 분석

백창현(Baek Chang-Hyeon),최동호(Choi Dong-Ho),이부용(Lee Bu-Yong),이인규(Lee In-Gyu) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.4

In this study, long and short-wave radiations were observed in urban and suburban areas during the summer season, and frequency analysis was performed for each radiation intensity by a new analysis method. The following results were obtained. ① Long-wave radiation values were found to be larger in the afternoon than in the morning, in both urban and suburban areas, unlike short-wave radiation values. ② Short-wave radiation showed a right-skewed frequency distribution. In the high energy area greater than 900 W/㎡, the frequency was significantly higher in the suburbs than in the urban areas. ③ Long-wave radiation was in the range of 290∼479 W/m2, its frequency distribution resembled a normal distribution, and the frequency of 410, 420 W/m2 was the highest.