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Two distinct causal paths from indoor air problems to sickness absenteism

In a building with two parts, one with bad indoor air quality, workers have been moved around from one to another and absenteeism rate and causes have been monitored.

Practical application of energy conservation with ASHRAE Standard 62

Practical application on two buildings (a movie theater and an office building) of the Indoor Air Quality Procedure described in ASHRAE Standard 62 is demonstrated. It shows in particular how air filtration can achieve acceptable indoor air quality and energy savings (by reducing outdoor air flowrate requirements).

Worker performance and ventilation : analyses of individual data for call-center workers

The study investigates the relationship between ventilation rates and work performance on two specific tasks (talk and wrap-up) in a call-center. CO2 concentrations ranged from 13 to 611 ppm and the study used a multi-variable regression to modelize the association between the predictors and the responses. Influence of ventilation rates and temperature on task performance are commented.

An intervention study of outdoor air supply rates and sick leave among office workers

The study has monitored two office buildings during 3 years changing position of dampers in order to control the air change in the buildings on periods of 3 months. CO2 levels, absenteism rate and rhinovirus in air samples are commented.

Experimental and numerical studies on air diffusion in a single office

The study has compared experimental data and numerical simulation of air velocity for a room with jet diffusers to assess comfort conditions in the occupied zone. Comparison was mainly done in planes perpendicular and along the jet axis.Results allow to expand the use of the numerical approach during design to achieve high levels of environmental comfort.

Effects of HVAC ventilation efficiency on the concentrations of formaldehyde and total volatile organic compounds in office buildings

Field measurements were carried out on six office buildings in Taïwan to evaluate ventilation efficiencies on the concentration of formaldehyde and TVOC, as well as the impact of ventilation rates on reducing these concentrations.

Optimal design of all-air systems

This paper gives formulas for optimal design of all-air systems regarding costs, allowing to calculate the optimum outdoor air rates in office buildings.

Global energy savings in office buildings by the use of daylighting.

Outlines a study carried out in order to assess the impact of lighting energy savings on global energy consumption for office buildings. It is the result of combining both daylighting and thermal aspects in an integrated approach, and the present article concentrates on the simulation results. A modelling exercise was carried out for several facade configurations, for the four main orientations and three combinations of internal wall reflection coefficients. To perform the simulations, a daylighting simulation tool (ADELINE) was coupled with a dynamic thermal simulation software (TRNSYS).

Indoor air quality requirements for healthy office buildings: recommendations based on an epidemiologic study.

The article presents IAQ requirements for healthy office buildings in Nordic climates, based on the results of an epidemiological study of a multistorey office building in Helsinki, Finland. Summarizes the results of the study and gives recommendations and their limitations.

The effect of air humidification on different symptoms in office workers - an epidemiologic study.

Describes a study of air humidification in the Pasila Office Center, which is a modern eight-floor office buildings of 2150 workers in Helsinki, Finland. A comparison was done between the occurrence of symptoms and complaints among the workers in the humidified part of the building and the symptoms and complaints of workers in similar nonhumidified rooms during February, March and April. Significantly less dryness of skin, throat and nose and nasal obstruction as well as sensation of air dryness was reported by the workers in the humidified part.