4.2 Comparison of energy consumption by region according to SHGC and window area ratio
is a figure showing the energy consumption according to the ratio of SHGC and window area in the general double-layer window and air layer 12mm. When the window area ratio was 30%, as SHGC increased from 0.2 to 0.8, the cooling energy increased by 6.06% in Daegu and at least by 3.32% in Daejeon. Heating energy decreases to a maximum of 4.59% in Daegu and decreases to a minimum of 3.85% in Seoul. It can be seen that as SHGC increases, the total energy consumption increases in areas affected by cooling energy, and the total energy consumption decreases in areas affected by heating energy.

When SHGC is 0.2, the increase in the window area ratio by 30% to 20% in Seoul increases by 0.82% and 0.79%, and the heating energy increases by 1.96% and 1.72 ^%.

 

It can be seen that as the window area ratio increases, the total energy consumption increases regardless of the effect of cooling and heating energy, and it can be seen that the effect of SHGC is higher than that of window area ratio

4.3 Comparison of energy consumption by window area ratio
is a figure showing energy consumption by window area ratio in a general double-glazed window and an air layer of 12 mm.

As can be seen in the figure, when Seoul and SHGC increased the window area ratio from 0.2 to 30% to 10%, the cooling energy increased by 0.4% on average, and the heating energy increased by 0.88% on average. When SHGC was increased from 0.2 to 0.2 and other conditions were as above, the cooling energy increased by 0.67%, 1.05%, and 1.55% on average, and the heating energy averaged by 0.69%, 0.52%, the increase was 0.38%.

Comparison of energy consumption by window area ratio (normal double-layer window, air layer 12mm)

	Seoul	Busan
SHGC 0.2
SHGC 0.4
SHGC 0.6
SHGC 0.8

When Busan increased SHGC from 0.2 to window area ratio by 30% to 10%, cooling energy increased by 0.44% on average and heating energy increased by 0.54% on average. When SHGC was increased from 0.2 to 0.2 and other conditions were the same as above, cooling energy increased by 0.87%, 1.45%, and 2.16%, and heating energy

The average increase of paper was 0.30%, 0.15%, and 0.14%.

It can be seen that as the window area ratio increases, the total energy consumption increases, but the larger the SHGC, the higher the increase rate of cooling energy and the lower the increase rate of heating energy.
5. Conclusion

This study aims to select energy-saving windows for multi-unit apartments by region and to use them as basic data bases. Buildings based on the heat transfer rate and SHGC, window area ratio by window characteristics based on legal design criteria, and climate by region The heating and cooling energy loads were compared, and the conclusions obtained through this study are as follows.

1. Heating energy is affected more than cooling energy by glass performance. As glass performance increases, total energy consumption per unit area decreases.

2. The cooling energy is more affected by SHGC so that the glass performance increases than the heating energy.

3. As SHGC increases, the rate of increase in cooling energy and the rate of decrease in heating energy are different, so the total energy consumption increases in areas affected by cooling energy, and the total energy consumption decreases in areas affected by heating energy.

4. As the window area ratio increases, the total energy consumption increases regardless of the effect of heating and cooling energy. SHGC has a higher impact than the window area ratio.

5. As the window area ratio increases, the total energy consumption increases, but the larger the SHGC, the higher the increase rate of cooling energy and the lower the increase rate of heating energy.
In this study, we analyzed and suggested only the energy consumption according to different climates by glass performance, window area ratio, SHGC, and region. However, in future studies, I would like to conduct a comprehensive analysis of the economics of energy costs and construction costs.
References
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2. Jung Seung-min, Lee Jeong-jae, A study on the prediction of heating energy reduction rate according to window performance and window area ratio, 2016

3. Eun-ah Noh, Jae-han Lim, Seung-young Song, Energy performance evaluation according to the window area ratio of the apartment complex, Korea Institute of Building Eco-friendly Facilities, 2011

4. Seo Hye-soo, Kang Eun-yul, Byoung-sun Kim, Analysis of correlation between residents' preferences according to visibility and energy performance by solar heat gain coefficient (SHGC), Journal of the Korean Institute of Architecture, 2011

5. Jong-Ho Yoon, Byeong-Soo Kim, Evaluation of Thermal Performance of the Movable Insulation System Installed in the Balcony Window of Apartment House, Korean Society for Solar Energy Society 2008

6. Seungho Jun, Byeongchan Lim, Evaluation of Optimal Design Factors for Rural Housing Standard Models Considering Energy Savings and Economics, 2016

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