Abstract
Due to the geographic location and the influence of the polar maritime and polar continental air masses we observe a large variety and variability of external air parameters in Poland. Both during the whole year and also in shorter, even several-day periods. The parameters of outside air indicate that combination of mechanical and natural ventilation in detached buildings can be cost-effective and allows keeping the thermal comfort and good indoor air quality.
Highlights
Due to the geographic location and the influence of the polar maritime and polar continental air masses we observe a large variety and variability of external air parameters in Poland
The highest outside air relative humidity in Poland is observed in winter – in January it ranges from 80 to 85%, and the lowest in summer – in June, about 55 - 60% [3]
It generally means that this ventilation would be cost-effective as long as the supply air temperature after heat recovery exchanger is higher than the outside air temperature, which would be delivered to the building in the case of natural ventilation
Summary
The function of the ventilation in detached buildings is to ensure indoor air quality by removing the contaminants which appeared during regular exploitation of the building (e.g. laundry, cooking, metabolic contaminants) and replace it with fresh air. Along with the change of regulations related to the quality of buildings, their thermal insulation improvement and energy demand reduction the currently used mechanical systems are becoming popular This type of ventilation in detached buildings reduces energy consumption, needed in the natural system for heating fresh air which is entering directly from the outside. Vandaele [5] defined hybrid ventilation as a system that provides a comfortable internal environment using both, natural and mechanical systems at different times of the day and/or season of the year. Another solution can be mixed–mode ventilation (MMV) described by the University of California. If we realized different ventilation strategies in different parts of building we can called this strategy zoned system
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