Radon concentration in a crawl space remained at the same level during autumn ( 756 Bq m-3 ) and inwinter ( 767 Bq m-3 ) because both air exchange rate and negative pressure (measured across thefoundation wall) increased after a installation of a new ventilation system in the crawl space. Inaddition, relative humidity and water content remained constant in the crawl space air during the sameperiod of time. Radon entry rate was explained by the pressure difference across the crawl space wallwith percentages of 51 % (winter) and 76 % (autumn).
In the study, the factors affecting concentrations of radon vertically lines were surveyed in twolarge office buildings. Integrated concentrations of radon were determined with alpha track etchfilms (2 months) and continuous monitoring (2-6 days) was carried out with Pylon AB-5equipment. The effective air exchange rates were analysed by the tracer gas method with aninfrared analyser and rates of air flows from vents were measured with a thermoanemometer.Pressure differences were measured with a manometer and temperature differences withthermoelements.
The LARES Housing and Health survey conducted in representative samples of eightEuropean towns provides substantial data from 3,373 households about housingconditions and the health of 8,519 residents. We assessed the relation between residentialthermal comfort, weather-tightness, ventilation, mould or dampness and some commondiseases and symptoms. We observed that reporting bad health was significantlyassociated with temperature, weather-tightness and mould or dampness problems.Asthma was significantly linked with mould or dampness, temperature, and ventilationproblems.
An Earth-to-Air Heat Exchanger (ETAHE) uses the ground’s thermal storage capacity to dampen ambient air temperature oscillations by delivering the outdoor air to the indoors through a horizontally buried duct. Most ETAHE simulation models assume the airfl
The main objective of the ongoing research project described in this paper was to study the potential forreducing energy used for ventilating buildings by using low-polluting building materials, withoutcompromising the indoor air quality. To quantify this potential, the exposure-response relationships, i.e.the relationships between ventilation rate and perceived indoor air quality, were established for roomsfurnished with different categories of polluting materials and the simulations of energy used forventilation were carried out.
Ventilation strategies play an important role of enhancing thermal comfort, Indoor Air Quality (IAQ) andenergy conservation in any conditioned space. Introduced in late 90s, Impinging Jet Ventilation (IJV) isthe system that can utilize stratification, while supplying with high velocity. With this characteristic andthe simplicity of its terminal configuration, IJV has an advantage over well-known DisplacementVentilation (DV) system. In this study, IJV system was investigated for establishing the protocol used inComputational Fluid Dynamics (CFD) simulation.
Introduced in late 90’s, Impinging Jet Ventilation (IJV) is the system that can utilize stratification, while supplying with medium to high velocity. This characteristic makes IJV easy to be controlled and operated, while room Indoor Air Quality (IAQ) can
Outbreaks of Sick Building Syndrome (SBS) first gained attention in the 1970s in the USA, with thedevelopment of more energy-efficient buildings that depend on mechanical ventilation systems tocirculate fresh air, as well as to control air temperature and sometimes humidity.SBS at office building and so on is not such a severe problem, but, a similar syndrome has beenrecently reported with increasing frequency in airtight new houses in Japan, that is, Sick HouseSyndrome (SHS). We have conducted the survey concerning SHS in Fukushima city, northeast area ofJapan since 2003.
Application of night cooling to educational buildings looks very promising in mild climates. Night coolingstrategy performance in a school building to be realised in Italy during 2008 has been studied by meansof a commercial CFD code.Due to the symmetry of the building, first a 2D numerical model consisting of a vertical section throughthe three-storey building has been developed. The CFD model includes the solid zone describing theconcrete structure.
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