Development of a ventilation system using window cavity

Jinuk Lee, Sanghoon Park, Taeyeon Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A household unit of an existing apartment in which residents lived was selected, and the indoor air quality in each space of the unit was measured for analysis. Analysis of the measurement data indicated that the concentration of carbon dioxide (CO2) constantly increased beyond 1000 ppm when a resident stayed indoors for an hour or more. Specifically, the concentration of CO2 increased when the resident was asleep to a level wherein negative impacts on health were observed. Moreover, the inflow of particulate matter (PM) was mainly caused by natural ventilation from the outside rather than the behavior of indoor residents, which generated an insignificant amount of PM. This study proposes a new ventilation system for solving the above-described problems. According to the system, when a window is closed, the window cavity created between a new frame and the existing frame is utilized as an air path for ventilation. The application of this system ensures a stable amount of ventilation through forced ventilation and prevents the inflow of external PM. Moreover, this system was designed to recover indoor heat through the window cavity and facilitate the pre-heating of outdoor air through heat collection based on solar radiation during the day.

Original languageEnglish
Article number8391
Pages (from-to)1-16
Number of pages16
JournalSustainability (Switzerland)
Volume12
Issue number20
DOIs
Publication statusPublished - 2020 Oct 2

Bibliographical note

Funding Information:
This study proposed a new ventilation system that was appropriate to the room of an apartment which the improvement of indoor air quality was analyzed based on the aforementioned experimental in which the improvement of indoor air quality was analyzed based on the aforementioned results. This system can be easily applied to existing houses without ventilation systems and utilizes a experimental results. This system can be easily applied to existing houses without ventilation systems window cavity, which is created between a new frame and an existing one, as an air path for ventilation. and utilizes a window cavity, which is created between a new frame and an existing one, as an air Specifically, insulation materials were used in the cavity of the window frame to prevent condensation. path for ventilation. Specifically, insulation materials were used in the cavity of the window frame to A filter net was also applied on the external sides of the lower parts to control the inflow of PM. prevent condensation. A filter net was also applied on the external sides of the lower parts to control The locations of insulation materials were examined based on the heat transfer simulation, and the the inflow of PM. The locations of insulation materials were examined based on the heat transfer balance between the actual flow rate and pre-heating temperature was optimized through a CFD simulation, and the balance between the actual flow rate and pre-heating temperature was optimized simulation analysis. When the ultimate design flow rate of 12.5 CMH was assumed, the indoor heat through a CFD simulation analysis. When the ultimate ◦ design flow rate of 12.5 CMH was assumed, transfer alone could result in a pre-heating effect of 8.9 C. the indoor heat transfer alone could result in a pre-heating effect of 8.9 °C. The application of the ventilation system designed in this study sufficiently enhances the indoor The application of the ventilation system designed in this study sufficiently enhances the indoor air quality in the small room targeted in this study. Moreover, it is also expected to decrease the air quality in the small room targeted in this study. Moreover, it is also expected to decrease the concentration of CO2, which rapidly increases during the sleep time of residents. concentration of CO2, which rapidly increases during the sleep time of residents. Field measurements are essential to substantially verify this developed system. Further studies Field measurements are essential to substantially verify this developed system. Further studies will be conducted to generate a practical mockup type of the developed system and apply it to the will be conducted to generate a practical mockup type of the developed system and apply it to the actual space for verification processes. In addition, the possibility of implementing this system as actual space for verification processes. In addition, the possibility of implementing this system as a a practical product will be examined through a comprehensive analysis based on the status of the practical product will be examined through a comprehensive analysis based on the status of the satisfactory amount of ventilation, verification of supply temperature, and the effects of PM prevention. satisfactory amount of ventilation, verification of supply temperature, and the effects of PM AuthorpreventContributions:ion. Conceptualization, S.P. and J.L.; methodology, J.L.; software, J.L.; validation, J.L.; formal analysis, J.L.; investigation, T.K.; resources, J.L.; data curation, J.L.; writing—original draft preparation, J.L.; Author Contributions: Conceptualization, S.P. and J.L.; methodology, J.L.; software, J.L.; validation, J.L.; formal acquisition, T.K. All authors have read and agreed to the published version of the manuscript. analysis, J.L.; investigation, T.K.; resources, J.L.; data curation, J.L.; writing—original draft preparation, J.L.; Fwunridtiinngg—: Trehvisiewwo arkndw eadsistiunpgp, oJ.rLte.;dvbisyuaalNizaattiioonn,a lJ.RL.e;sseuaprcehrvFiosiuonnd, aTt.iKon.; opfroKjeocrte aad(NmRinFi)stgraratinotnf,uTn.dKe.;dfbuyndthineg acquisition, T.K. All authors have read and agreed to the published version of the manuscript. Ministry of Education. Funding: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Conflicts of Interest: The authors declare that they have no known competing financial interests or personal Korean government (MSIT, MOE) and (No. 2019M3E7A1113095). ※ MSIT: Ministry of Science and ICT, MOE: Ministry of Education.

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT, MOE) and (No. 2019M3E7A1113095). ?MSIT: Ministry of Science and ICT, MOE: Ministry of Education.

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Management, Monitoring, Policy and Law

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