Abstract
In order to retain good indoor air quality through the year in detached houses with passive ventilation systems, the authors investigated a mechanical control air-supply method. Firstly, indoor environments in houses with passive ventilation systems with thermal dampers, were examined using a simulation program (Fresh). Secondly, a passive ventilation system with a thermal damper, an under-floorheating system with a heat pump and were installed in an airtight house at Maebashi in Japan and measurements on its ventilation characteristics and indoor air quality were made. The simulation results showed that if the thermal damper is well tuned, this mechanically controlled air-supply opening keeps ventilation rates adequate through the year especially in airtight houses. The measurement results showed that the ventilation rates were kept above the required level through the year and the TVOC concentration decreases from 3000 to 200 μg/m3 in 5 months after the construction.
Highlights
Passive ventilation systems (PVS) have been used in detached houses in Hokkaido, the coldest area of Japan, since 1990s
The most beneficial point of PVS is that it keeps ventilation rates adequate without operation by dwellers, so it is a fail-safe system in retaining good indoor air quality in houses
The lack of ventilation is a problem in most areas of Japan, so a hybrid ventilation system (HVS) was developed using an airflow sensor and a mechanical fan in 1999 and it is widely used in Japan
Summary
Passive ventilation systems (PVS) have been used in detached houses in Hokkaido, the coldest area of Japan, since 1990s. The most beneficial point of PVS is that it keeps ventilation rates adequate without operation by dwellers, so it is a fail-safe system in retaining good indoor air quality in houses. Ventilation with PVS is not enough in warm seasons. The lack of ventilation is a problem in most areas of Japan, so a hybrid ventilation system (HVS) was developed using an airflow sensor and a mechanical fan in 1999 and it is widely used in Japan. PVS is beginning to be used in warm area of Japan as a ventilation system for winter. In order to keep ventilation rates adequate in both winter and mild seasons, a passive ventilation system using mechanical thermal dampers TD controlled by supply air temperature was designed
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