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Energy Performance Evaluation of Apartment Houses According to Window Energy Consumption Efficiency Rating System in Korea

2018; Society of Air-conditioning and Refrigerating Engineers of Korea; Volume: 30; Issue: 4 Linguagem: Inglês

10.6110/kjacr.2018.30.4.159

2465-7611

Hee Won Lim, Dong Yun Kim, Soo Man Lee, Jung Hyuk An, Jong-Ho Yoon, U–Cheul Shin,

Diverse Academic Research Analysis

The Korean fenestration energy consumption efficiency rating system only considers thermal performance of the heat transfer coefficient (U-value) and airtightness excluding optical characteristics of the solar heat gain coefficient (SHGC). This study analyzed annual heating and cooling energy requirements on the middle floor of apartment by optical and thermal performance of windows to evaluate the suitability of the rating system. One hundred and twenty-eight windows were analyzed using THERM and WINDOW 7.4, and energy simulation for a reference model of an apartment house facing south was performed using TRNSYS 17. The results showed that window performance was the main factor in the heating and cooling load. The heating load of the reference model was 539 kWh to 2,022 kW, and the cooling load was 376 kWh to 1,443 kWh. The coefficient of determination (R2) of the heating and cooling loads driven from the SHGC were 0.7437 and 0.9869, which are more compatible than those from the U-value, 0.0558 and 0.4781. Therefore, it is not reasonable to evaluate the energy performance of windows using only the U-value, and the Korean fenestration energy consumption efficiency rating system requires a new evaluation standard, including SHGC.