Keywords: luminous environment, illuminance, luminance, living room, modern houses, traditional houses, Hanji, traditional Korean paper.

Windows in modern houses permit large amounts of daylight into the rooms as well as providing good views. However, shading devices such as curtains and blinds should be used in order to reduce the discomfort glare caused by direct daylight. Traditional Korean papers 'Sunji' (thin Hanji 100% made of mulberry bark, the main material for making Hanji) and 'Unyongji' are used as window wallpapers. Hanji makes a uniform luminous environment by diffusing the daylight [1]. In addition, Hanji has a good ventilation performance as a result of the spaces of the fibre and can control indoor humidity levels properly because Hanji has a great ability to absorb and release moisture [2].

The purpose of this study is to analyse physical values of the indoor luminous environment created using Hanji by comparing the illuminance and the luminance of clear glass windows in a modern house and the windows in traditional house on which traditional Korea papers (Sunji and Unyongji) are pasted.

The measurement of the luminous environment in a modern house and a traditional house was carried out in the mock-up model on the rooftop of the technology building in Kyung Hee University. The illuminance on a horizontal plane was measured with a HOBO U12. The luminance of window and window surrounding in the living room was measured with a Nikon Coolpix 8400 and the luminance was analyzed with the Photolux2.1 software. Daylight factors and uniformity ratios were used as indicators for the evaluation.

As a result of analysing the average indoor daylight factor, it was shown that the window pasted with Unyongji reduced the daylight penetration and the luminance was the lowest in the window pasted with Unyongji in comparison with the others. It was reasoned that the characteristics of Unyongji which does not allow light to pass well and hence made luminance in the window and .the area surrounding the window smaller. Accordingly when Unyongji is used as a glazing system in a window, the amount of daylight will be reduced, but it will increase the uniformity ratio of daylight making the indoor atmosphere friendly. As Unyongji alleviate rapid changes in the luminous environment caused by the change of direct daylight, it can be widely applied in modern houses.

1

G. Kim, J.T. Kim, "A Design and Performance Evaluation of Differentiated Daylight-Glazing Systems", Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 19(2), 13-22, 2005. (in Korean)

2

G. Kim, "Daylighting Controls of Korean Traditional Houses built in Chosun Dynasty especially on examples located in northern Gyeongbuk province", Journal of the Korea institute of ecological architecture and environment, 4(3), 79-86, 2004. (in Korean)

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