Yun Geun Young

Korean consumers are demanding an increase in building quantities as well as diversity in the constructionmarket of buildings. This is as a result of the population growth and the rapid economic development since 1980. Although many buildings have been built to meet these demands, the insufficient maintenance related technologies andold indoor materials have reduced both the capacity of building performance as well as the economy. Nowadays,building renovations have proved to be a better alternat

Lighting energy consumption accounts for a large portion of electricity use in building and the exact amount of energy use is dependent on how occupants use lighting. This study aims to reveal visual environmental conditions, occupancy patterns, and their implications for the occupant use of lighting. The field measurement of four offices in Yongin was carried out from 1 June to 31 August 2010. External and indoor illuminances, and the use of lighting and entrance doors were monitored at ten min

Governments are increasing energy efficiency in buildings through various policies to reduce building energy consumption. In 2002, the European Union adopted a building energy performance guideline to set minimum efficiency standards for residential and commercial buildings. Starting in 2020, all EU member states should ensure that all buildings are Near-Zero Energy Buildings (NZEB). In Korea, the government issued a zero-energy certification system. Since 2020, public buildings are required to

This study aims to analyze the field survey of thermal comfort in office building with national thermal environment standard. Internal and external temperatures were measured at ten minute intervals and compared in accordance with the national standard for thermal environment. Sixty two workers filled in the questionnaire survey forms five times a day for 40 days. Field monitoring of offices in Seoul, Korea were conducted from 20 July to 28 August. Result for the comfort temperature was set a 26

High economic growth causes increase of the building energy consumption. The energy consumption for HVAC system accounts for 40∼50% of the whole building consumption. The trend for building is large-scale and high-rise. Because of the trend, the energy consumption is becoming bigger than before. Nowadays, HVAC system design are recognized as the solution for a energy-saving. This paper is focused on the energy performance evaluation of central air- conditioning system(water-based) and system air

The daylited space can improve visual comfort and occupant's well-being. However discomfort glare from the daylight is a common problem in indoor environments and in general, the window is the main glare sources. Some formulas have been proposed for predicting glare from the daylight, however, they do not consider the effect on glare of the view through a window and some studies proved that they are inadequate in real daylight situation. This research aims to identify the relationship between vi

LED lightinghasreceivedmuchattentioninrecentyearsduetoitshighenergyefficiencyandenvironmental friendliness.AsthecoloroflightcanbeobtainedbyadjustingthelightintensityofLEDs,thequalityofvisual environmentcanbeimproved.TheaimsofthisstudyaretodevelopawavelengthadjustableLED lightingsystem andtoexamineitslightingperformances.TheLED lightingsystem andexperimentalcellforassessmentofthe lightingperformancewereconstructed.ThisLED lightingsystem isabletomaterializethevariousspectralpower distributionandco

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The building energy model(BEM) has been widely adopted in buildings for evaluating building performance. There are many building energy simulation software. However, there are significant differences between the simulation prediction and the reality. Appliance power density, lighting power density, and cooling setpoint temperature are major causes of virtual model errors. To increase building energy efficiency and accuracy, probabilistic calibration regarding to occupant factors in building ener

The use of natural light has the potential for improving both the energy efficiency and indoor environmental quality in buildings. A light-pipe system can introduce daylight to spaces that would otherwise not be able to benefit from the advantages of daylight penetration. For the light-pipe system to be widely used in Korea, it is important to quantify its daylighting performance with due consideration regarding the effects imposed by the local climate conditions. This paper presents the evaluat

Lighting energy accounts for approximately 20% of the electrical energy used worldwide. Thus, High efficiency Light emitting diode(LED)lighting is getting more popular as the next generation lighting replaced to traditional lighting fixtures. Also, LED lighting not only has a long lifetime but also can realize a variety visual environments through the wavelengh control. The lighting energy varies depending on the Spectral Power Distribution(SPD) even though the Illuminance level is same. Therefo

Building energy benchmarking is a crucial step in building energy monitoring. Current benchmarking practices often face limitations rooted in the adopted methodologies. For instance, existing benchmark tools are based on the ordinary least squares regression method, which is highly sensitive to outliers and non-linearity in the dataset; this is likely to produce inaccurate benchmark scores. We propose a quantile regression benchmarking model reinforced with a gradient boosting decision tree algo

In recent years, crime has been steadily increasing, causing not only economic damage but also aggravating the social atmosphere. The CPTED(Crime Prevention Through Environmental Design) guideline, which is an environmental crime prevention design technique, reduces the possibility of crime by implementing a proper defensive design plan through appropriate lighting design in the city and reduces the fear of crime. Among the various principles of CPTED, the proper use of street lamps and CCTV is

전 세계적으로 사용되는 전기에너지의 약 20%가 조명에 사용되고 있다. 따라서 고효율조명의 사용이 권장되면서 기존의 조명기구를 대체할 차세대 조명기구로, LED조명이 각광받고 있다. LED조명은 수명이 길다는 장점뿐만 아니라, 파장별 강조도절을 통해 다양한 시환경을 구현할 수 있다. 또한 같은 조도라 할지라도, 파장분포에 따라서 조명에 쓰이는 에너지가 다르다. 따라서 본 연구에서는 동일한 조도조건에서 파장분포가 다를 때, 실내에너지 소비의 차이를 나타내고자한다. 그 결과, 파란색 강조 파장아래에서 보다 빨간색 강조 파장아래에서 연간 조명에너지 소비량이 약 10% 더 적게 나타났다.