Human Comfort and Productivity under Humidity Conditions with Different Indoor Air Quality Levels in Summer and Winter

Subjective experiments were conducted during the summer season and the winter season in order toclarify the multiplied effects of humidity and indoor chemical pollutants on subjective comfort and productivity. Lower concentration of formaldehyde was observed at low humidity than at high humidity. Subjects rated the acceptability of air lower at the beginning of the exposure in the environments polluted with formaldehyde. On the other hand, lower humidity caused subjects to rate air quality higher in clean air.

Effect of Adsorptive Building Material on Reducing HCHO Concentration in Room

This paper reports the effect of adsorptive building materials in reducing formaldehyde inindoor air. Although some studies have reported that adsorptive building materials are effective inreducing concentrations in chamber experiments, there are few studies which are carried out in actual room. In this paper we examine the reduction effect of changing the surface area of the adsorptive material in a room and the most effective arrangement of the material. We confirmed that the reduction effect is not always proportional to the adsorption surface area.

Chemical reactions among indoor pollutants : what we 've learned in the new millennium ?

This paper emphasizes on the role of hydroxyl radicals in indoor processes, on chemical reactions occurring on indoor surfaces, and the impact of products of indoor chemistry on building occupants. The products of indoor chemistry can impact comfort and health, but the importance of those effects and the frequency of their occurrence remains to be elucidated.

Investigation of indoor air quality in a residence using natural materials

Indoor air quality (IAQ) in a house using building materials with low chemical emission wasinvestigated for 8 months. Indoor air concentration, emission rate of aldehydes and VOCsfrom floor and wall, air change rate, temperature and relative humidity were measured toevaluate the IAQ of the house. Air change rate was measured by two methods. Indoor airconcentration and emission rate from building materials were measured at differentconstruction phases (before and after completion) and after being occupied. A questionnairewas used to examine the influence of lifestyle on IAQ.

Air quality in offices, impact of ventilation rate, ozone and limonene

The objective of this study has been to clarify to what extent ozone (O3) and O3 /limonene in interaction with surface materials has an impact on the indoor air quality in typical low-polluting offices at realistic outdoor air change rates. Three similar offices furnished with the same materials and ventilated with charcoal filtered outdoor air were used in the study. Eight environmental conditions with different realistic combinations of air change rate, O3 and limonene levels were studied.

The effect of painting at home with a modern paint

The effect on Indoor Air quality of painting at home has been debated. This paper presents a case study where a normal Scandinavian two-bedroom apartment has been refurnished with new paint on the walls and ceilings and the VOC emissions have been measured during eight weeks. Low-emitting wall and ceiling paint was selected for the study and a paint shop rolled two layers of new paint on the walls and ceilings in two rooms. Parallell the paints were applied to glass plates according to the Scandinavian trade standard and investigated with the FLEC method in the laboratory.

Monitoring of a low-velocity air jet using computed tomography

Computed tomography consists in measuring chemical concentrations profiles in a room from the attenuation of a large number of laser rays and converting measurements in a two dimensional concentration profile by a reconstruction algorithm. This study shows the effectiveness of one of these algorithms (Low Third Derivative).

The sick building syndrome in offices.