Abstract
This study surveyed the impact of a negative pressure in a room in a highly airtight residential apartment with Class 3 ventilation (natural air intake and mechanical exhaust). The results of the study are as follows. 1) A room may reach an excessive level of negative pressure depending on how the ventilation system is used. 2) Noise from the drain pipe of a room air conditioner caused by negative pressure in the room is dependent on how the drain pipe is installed. 3) An experiment was conducted to investigate the mechanism of a seal break in a toilet trap. However, the seal did not break. Thus, seal breaks may be caused by multiple factors.
Highlights
In the EU countries in order to spread the Nearly zeroenergy buildings of new construction or major refurbishment prior to 2020, the building is mentioned about the need to high airtight and perform a ventilation correctly [1]
The problems caused by building airtightness include the problem of indoor and outdoor pressure difference in high-rise buildings [4], and health problems caused by Indoor Air Quality (IAQ) such as moisture, carbon dioxide, mold, condensation, etc
This study investigates various problems caused by negative pressure in a room due to increased airtightness and its mechanical ventilation system [6]
Summary
In the EU countries in order to spread the Nearly zeroenergy buildings of new construction or major refurbishment prior to 2020, the building is mentioned about the need to high airtight and perform a ventilation correctly [1]. The problems caused by the installation of mechanical ventilation system in airtight buildings are hardly discussed. Increased airtightness reduces the volume of draft and improves thermal comfort. When the effective leakage area of an outdoor air inlet (denoted as ELA10 at 9.8Pa) is insufficient, the room pressure becomes significantly negative, causing difficulties in opening and closing the front door and windows, leading to noise in the drain pipe of room air conditioners, negatively impacting drainage traps, and compromising the drainage capacity of sanitary equipment. This study investigates various problems caused by negative pressure in a room due to increased airtightness and its mechanical ventilation system [6]. Airtightness of the apartment, pressure difference between inside and outside the room, effective leakage area of the outdoor air inlet, and volume of air that passes through the ventilation system were measured. Fluctuation in the water level in a toilet trap and ideal pressure difference between inside and outside the room were considered
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