AIVC - Air Infiltration and Ventilation Centre

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ventilation rate

Effects of temperature and outdoor air supply rate on the performance of call center operators in the tropics

That study was performed in a call center. During nine consecutive weeks, temperature and outdoor air supply rate were combined and introduced to the occupants in a blind intervention approach.Those 2 variables had significant interaction effects on the workers' talk time.

Interior air quality, energy and productivity

Fresh air has a very important role in indoor air quality.This study aims at quantifying the costs and the gains of an increase of the ventilation rate, in an office building. Results show that a big increase of the ventilation rate leads to an increase of the installation costs, but to no change of the energy costs. The additional costs may be paid back quickly due to the productivity improvement.

Economizer system cost effectiveness: accounting for the influence of ventilation rate on sick leave

This study estimated the health, energy and economic benefits of an economizer ventilationcontrol system that increases outside air supply during mild weather to save energy. A modelof the influence of ventilation rate on airborne transmission of respiratory illnesses was usedto extend the limited data relating ventilation rate with illness and sick leave. An energysimulation model calculated ventilation rates and energy use versus time for an office buildingin Washington, D.C., with fixed minimum outdoor air supply rates, with and without aneconomizer.

Comparison of productivity and absenteeism effects of indoor environmental quality in offices

This paper is an overview of literature that investigates the effects of general environmentalquality, indoor air pollution, ventilation rates, thermal comfort, temperature control andnumber of persons per workspace on productivity and sickness absenteeism in offices. Thereview includes both self-reported effects and objective measurements of productivity andabsenteeism and both laboratory studies and field investigations. It turns out that a goodgeneral environmental quality increases productivity by 10-15% and decreases sicknessabsenteeism by 2.5 percentpoint.

Temperature and ventilation effects on the work performance of office workers (study of a call centre in the tropics)

This paper presents findings from a recent call centre study conducted in an air-conditionedoffice in the Tropics. The effects of temperature and outdoor air supply rate, each kept at twoset points within currently acceptable limits, were explored in a 2 2 balanced experimentaldesign over a 9-week period. The results indicate that both a slightly cooler thermalenvironment and improved indoor air quality improve performance by reducing average callduration. Temperature and outdoor air supply rate were synergistically related to one anotherin affecting operator performance (P < 0.062).

Call-centre operator performance with new and used filters at two outdoor air supply rates

A 2 × 2 replicated field intervention experiment was conducted in a call-centre providing a national public telephone directory service: outdoor air supply rate was adjusted to be 8 or 80% of the total airflow of 430 l/s (3.5 h-1); and the supply air filt

A principal component analysis of perception and SBS symptoms of office workers in the tropics at two temperatures and two ventilation rates

Correlation analysis of subjective responses of tropically acclimatized office workers in a fieldstudy conducted over nine continuous weeks using a 2 2 balanced design with temperatureand fresh air ventilation rates as control variables revealed that several related SBS symptomsare highly correlated. Thermal comfort and acceptability of air quality exhibit a strongcorrelation, whereas perceived indoor environmental variables have poor correlations amongthemselves. Principal component analysis further improved measures to variability bycombining coherent variables into six factors.

Field survey of indoor chemical pollution and health hazards in sick houses

In order to determine the a etiological factor of Sick House Syndrome (SHS), indoor airquality of 35 houses in Miyagi prefecture of Japan, where occupants are suspected ofsuffering from SHS, had been investigated during the summers in 2000-2002. Theinvestigation included the measurement of indoor chemical substance concentration and aquestionnaire regarding residential environment and subjective symptoms.As a result, the formaldehyde concentrations in 71% of all houses exceeded the guideline ofJapan.

Study of ventilation performance and indoor air quality in eight sick houses

In this study, the houses where residents were suspected of having sick house syndromelocated in Miyagi prefecture of Japan, had been investigated during the summer of 2001. Theinvestigation included the measurements of the aldehydes and volatile organic compounds(VOCs) concentration, air tightness level, airflow volume at inlets/outlets and ventilation rate.This paper shows the results of indoor air quality and ventilation rate in eight houses. Allthese houses, which are air tight except one house, use mechanical ventilation system.

Passive parallel VOCs and ventilation rate sampler

Ventilation is the most effective procedure to reduce indoor air pollutant. Volatile organiccompounds (VOCs), which cause health related symptoms, are often detected in the indoorenvironment. The way of ventilation should be decided depending on the level of VOCs. Thelevel of VOCs and ventilation rate are usually measured individually. This study will proposea simple method to measure both the ventilation rate, by perfluorocarbon tracer gas technique(PFT), and VOCs concentration immediately by using a single sampler.