Seasonal variation of radon concentration - measurements in some european countries

The radon concentrations in indoor air and in soil air vary both on short term (daily, weekly) and onlong term (seasonal). The radon level and its changes depend on a few parameters, which may bedifferent from one building to another and from one type of soil to another. It is important to know theseasonal variation of the indoor radon levels if the level is to be compared with the national upperlimits in Europe for indoor radon concentrations.

Annual variation of air distribution in a cold climate

The airflows through a one family prototype building have been simulated. Supply openings in living room and bedrooms have a size of 200 and 400 cm2 respectively. The ventilation system is a passive stack ventilation system, with ventilation chimneys from kitchen, WC and bathroom. The following parameters have been studied: the supply opening areas and heights, the overflow opening areas between bedrooms and hall and between WC/bathroom and hall, the height of the ventilation chimneys and the opening and closing of living room and bedroom doors.

Hygrothermal behaviour of a humidity controlled air inlet

This paper deals with the real behavior of a humidity controlled air inlet, regarding to relative humidity and temperature. It has been often heard, that relative humidity is not the best indicator for detecting a need of ventilation in main rooms (living room and bedrooms) because it is season dependant (the absolute humidity outside varies in a wide range from winter to summer, which should lead the air inlet to be closed in winter and open in summer).

Seasonal cycle of VOCs in apartments

This paper intends to resolve the spatial and temporal variation of VOC concentrations in apartments. Numerous indoor and outdoor measurements taken in the period between 1994 and 2001 have been analyzed.A method is presented, it can be used to normalize the results from VOC measurements taken at any time of the year. A table with adjustments factors is given.

Designing fuzzy controller in naturally ventilated buildings for summer conditions.

Describes the process of designing a supervisory control to provide thermal comfort and adequate air distribution inside a single-sided naturally ventilated test room. The controller is based on fuzzy logic reasoning. Inputs are the outside wind velocity, direction, outside and inside temperatures. Output is the opening position. The strategy is then validated using experimental data from a naturally ventilated test room. Presents the initial results of the study, which show that the controller is capable of providing better thermal comfort inside the room.

Indoor radon problem and ventilation strategies.

All buildings, depending on their design and particularly on how they are vented, are polluted to some extent with radon. Radon and its daughters may be trapped within buildings and accumulate there, thus threatening the health of their dwellers. Radon is an inert radioactive gas whose emanation into the building can mostly come from the underlying soil and from the building materials. The unhealthy buildings risk starts to act with tendency of saving energy and the related limitation of room ventilation to minimum.

Seasonal energy storage.