As the technology in building materialsadvances, the room air pollution caused bychemical compounds, and also by preservativesand insecticides for termite control, has becomea serious problem. With Regard to the airconvection in the house to contribute to themovement of the contaminants, there is stackeffect, wind presssure, and mechnicalventilation as the driving forces for airmovement, that is also much affected by the airtightness and ventilation path of the house.

Domain decomposition technique is a methodfor CFD simulation, which can handle internalairflow of cross-ventilation of dwellingsseparately from extemal domain. Boundaryconditions for internal airflow simulation werepicked from calculated result of extemaldomain. Cross-ventilation flow rate waspredicted by applying Local dynamic similaritymodel for large openings. Simulated resultswere compared with experimental results andgood correspondence was observed with respectto cross-ventilation flow rate.

The concentration in the convection flows ofresuspended particles from the floor area wasexperimentally investigated under laboratoryconditions with different ventilation strategies.It was concluded that the number of smallparticles transported into the breathing zone waslarge with a forced resuspension; however thereseemed to be little risk of resuspension ofparticles from the floor due to the air supplyunder normal conditions. The geometry of thesimulators and the layout of the room had a biginfluence on the exposure.

It is often pointed out that when evaluating the energy-saving performance of equipment, it isimportant to take into consideration how theequipment under consideration is actually used.In evaluating heat transfer by contact duringfloor heating, it is important not only toevaluate spatial temperature distribution andoperative temperature but also to take intoconsideration heat transfer by contact with thefloor in view of the actual state of the floorheating system users.

The use of floor heating has been know sincemore than 3000 years from the Chinese Kang,the Korean Ondol, the Romans hypocaust to daysmodern water based systems embedded in thefloor construction. The application of suchsystems also for cooling is however less known.To evaluate the usefulness of radiant floorcooling it is important to take into accountcomfort, cooling capacity, control and design.One limiting factor is the floor surfacetemperature. In spaces with seated or people thefloor temperature should not be lower than 20 Cfor comfort reasons.

This paper deals with pressurization usingHVAC systems on each floor as acountermeasure against stack effect generated inthe winter in high-rise office buildings that donot use revolving doors at the entrance. Awhole-building pressurization system isinstalled in a 23-story building located in Tokyoin order to prevent various problems caused bythe stack effect, e.g.

The Mechanical supply only (MSO) ventilationsystem has many advantages, such as good airdistribution, easy pre-heating of cold fresh airsupply and prevention of chemical aerosolsintake through wall cavity. However, thissystem has not been used for dwellings becauseof the risk of the condensation in the wall.

The influence of air humidification in aircraft, on perception of cabin air quality among airline crew was investigated in that study. In-flight investigations were performed on eight intercontinental flights with a Boeing 767 : four of them were performed with the air humidification device turned on when going and turned off in the opposite direction. The other four flight had the inverse humidification sequence. The results of measurements are presented along with the analysis of the questionnaires submitted to the crew.

For that study, a subsample of 396 Chinese rural households were monitored. The results of the measurements showed that for nearly all household stoves or fuel groupings, PM4 levels were much higher than the national PM10 standard for indoor air. It relies on unprocessed solid fuels that emit substantial pollution into the household environment.
Improved stoves exist but are still not at levels that meet standards, and very often other unimproved stoves are present in the kitchen.

For that paper, the flow field and the emission field of VOCs from the surface of building materials in a FLEC (Field and Laboratory Emission Cell) cavity are investigated by 3D CFD analysis. Emission phenomena controlled by internal diffusion, or by external diffusion, or by mixed diffusion are studied. The results and conclusions are presented.