Abstract
Korean law requires at least three levels of control for apartment ventilation systems, including 0.5 air change per hour (ACH). When this law was enacted, it was believed that a 0.5 ACH air flow rate would be sufficient for apartments following building completion. However, ventilation systems cause different air qualities in each space within a unit, depending on infiltration rate and number of occupants. In addition, the current ventilation rate standard is based on an apartment unit’s total area, assuming that all room doors are open. In this study, changes in CO2 concentration were experimentally analyzed based on the number of occupants and various ventilation frequencies with closed doors to analyze air quality differences among rooms in a typical 85 m2 apartment unit in Korea. When the 0.5 ACH ventilation was performed, maintaining 1000 ppm or less was difficult if four people stayed for more than two hours in the living room or two people stayed for more than one hour in the bedroom with closed doors. Our results indicate that it is challenging to maintain a CO2 concentration of 1000 ppm when doors are closed as standards are calculated based on a unit’s total area. Therefore, ventilation systems should be required to provide different air volumes for each room.
Highlights
IntroductionAccording to the facility standard rules for buildings in Korea [1], housing ventilation systems must be able to provide a ventilation rate of at least 0.5 air change per hour (ACH)
According to the facility standard rules for buildings in Korea [1], housing ventilation systems must be able to provide a ventilation rate of at least 0.5 air change per hour (ACH).This corresponds to an air volume of approximately 100 m3 /h for the national housing scale with an area of 85 m2 and ceiling height of 2.3 m, as defined in the Housing Law [2]
Because the volume is based on all rooms in an apartment unit, it assumes that all room doors are open
Summary
According to the facility standard rules for buildings in Korea [1], housing ventilation systems must be able to provide a ventilation rate of at least 0.5 air change per hour (ACH). This corresponds to an air volume of approximately 100 m3 /h for the national housing scale with an area of 85 m2 and ceiling height of 2.3 m, as defined in the Housing Law [2]. According to the climate change monitoring information provided by the Korean Meteorological Administration, the external CO2 concentration has been increasing since 1984 [7]
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