ZEMCH 2019 International Conference Proceedings April.2020 | Página 178
3 1.113 1.227
(‐10.2%) 1.142
(‐2.6%) 1.129
(‐1.4%)
4 1.314 1.470
(‐11.9%) 1.355
(‐3.1%) 1.335
(‐1.6%)
5 1.006 1.152
(‐14.5%) 1.030
(‐2.4%) 0.991
(1.5%)
6 0.950 1.046
(‐10.1%) 0.986
(‐3.8%) 0.988
(‐4.0%)
7 1.187 1.320
(‐11.2%) 1.246
(‐5.0%) 1.233
(‐3.9%)
5. Conclusions
In Korea, if the thermal transmittance of a window needs to be calculated, the procedure in ISO
15099 shall be chosen based on the regulation; however, ISO 15099 can determine an incorrect U‐value
for a double window compared with the U‐value that would be determined in a laboratory. The Korean
government has been operating a simulation system for the thermal performance of windows in the
program to allow window companies to save time and money in determining window energy ratings.
For an appropriate calculation method for the thermal transmittance of double windows, the procedure
in ISO 10077 should be considered in the Korean regulations. In this study, it was found that the
calculation method for a double window requires the thermal resistance of the air cavity between the
external and internal windows based on the actual thermal characteristics, the procedure with ISO
10077 for the overall thermal transmittance of a double window, and the value of the linear thermal
transmittance calculated by ISO 10077‐2. An approach that better considers the effects of glazing will
be studied in future work.
Funding: This research was supported by a grant (19RERP‐C146906‐02) from the Residential Environment
Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government.
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ZEMCH 2019 International Conference l Seoul, Korea