Cooling energy reduction effect of parallel double-window system operation in residential buildings in South Korea

Seung Won Lee, Seung Bok Leigh, Taeyeon Kim, Chang Heon Cheong, Sooyoun Cho

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


This paper aims to derive the operational modes of a parallel double-window system that reduces cooling energy consumption and satisfies indoor comfort through natural ventilation. The parallel double-window system examined in this paper is a window system that could control indoor draft distribution and adjust the size of the opening depending on indoor and outdoor conditions. The system can be used in five ways (all close, out-open + in close, out-open+in open (tilt), out-open+in open (turn) and all open). This work verified the energy savings and indoor comfort of the existing mode experimentally, which were originally derived based on simple calculations at the time when the parallel double-window system was developed. A new operation mode, Alt 1, was derived, which addressed problems of the existing mode. In addition, in this work, the operation mode Alt 2 was derived, which simplified Alt 1 so that the actual occupant can use the system easily. By measuring these three operation modes and comparing the results with those of energy plus simulations, the work derived the amount of cooling energy savings and the level of indoor comfort through the use of an appropriate operation mode during inter-seasonal periods. Compared to when the natural ventilation operation mode was not used, cooling energy consumption was reduced by 60% when the operation mode was in use. The cooling temperature set point could have a significant impact on cooling energy consumption.

Original languageEnglish
Pages (from-to)636-658
Number of pages23
JournalIndoor and Built Environment
Issue number5
Publication statusPublished - 2019 Jun 1

Bibliographical note

Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was supported by a grant (11 High-tech Urban G03) from the High-tech Urban Development Program that is funded by Korea’s Ministry of Land, Infrastructure and Transport.

Publisher Copyright:
© The Author(s) 2017.

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Public Health, Environmental and Occupational Health


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