AIVC - Air Infiltration and Ventilation Centre

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Effect of temperature on perceived work environment, symptoms and selfestimated productivity in office work

The aim of the study was to investigate the effects of elevated summer indoor temperatures onperceived comfort, symptoms and subjectively assessed productivity in an office building.The measurements during spring 2002 showed that indoor environment was at the normalFinnish office building level. The mean room temperature during the 2-week measurementperiod was 22C. An indoor air questionnaire (MM-40-FIN) including additional questionsabout work efficiency was presented to the employees during the measurements. Theperceived indoor environment was at the normal Finnish office level.

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).

Effects of indoor air quality on office workers’ work performance - a preliminary analysis

We conducted an epidemiological study to examine the associations between indoor climate and office workers’ health and working efficiency. We investigated four office buildings in Massachusetts, USA, beginning May 1997 over 1 year. Ninety-eight participa

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.

Effect of ventilation on mould growth in a Japanese bathroom

This paper investigates the effect of ventilation on mould growth in a typical Japanese bathroom byuse of the fungal index which indicates the growth rate of a mould, Alternaria alternata S-78. Thebathroom was set in an artificial climate where the temperature and relative humidity (RH) werekept constant. The temperature, RH and fungal index in the bathroom were measured under severalventilation methods after taking a bath.

The impact of a personalized ventilation system on indoor air quality at different levels of room air temperature

The performance of a Personalized Ventilation (PV) system with regard to air qualityperceived by people was studied at three room temperature levels: 23, 26 and 29C. Thirtyhuman subjects participated in the experiment. The system supplied both isothermal (23, 26,29C) and non-isothermal (23C) outdoor air from an outlet attached to a moveable arm. Thesubjects were delegated with control of both airflow velocity and its direction. Physicalmeasurements performed with a breathing thermal manikin were used to explain the resultsfrom the human subject experiments.

Thermal response of Korean college students in a thermal environment chamber

The thermal comfort response of Korean college students was investigated in a thermalenvironment chamber both in summer and winter seasons. Eight thermal conditions consistingof four air temperatures (24, 26, 28, 30C) and three relative humidities (40, 60, 80%) wereselected in summer. Eight thermal conditions consisting of five air temperatures (18, 20, 22,24, 26C) and two relative humidities (40, 60%) were chosen in winter. In each test, sevenfemales or seven males were questioned in the chamber for 3 h, where thermal and comfortsensations were surveyed every 15 min.

Prediction of indoor sol-air temperature in an atrium space with a vertical distribution

This study suggests a computer model capable of predicting thermal environment of an atriumand calculating indoor sol-air temperature, which can evaluate the influence of heat loads thatthe atrium space puts on the adjoining rooms. The computer model is based on zonal modelcombined with the solar radiation model using the Monte Carlo method and ray-tracingtechnique. The accuracy of computer model was validated through scale model test and fieldmeasurement. The average relative error of solar radiation model for predicting solar radiationintensity in atrium space was 11.8%.

Thermal preference of task environment and its influence on productivity

Thermal manikin test and subjective experiments with a desktop based task conditioningsystem were carried out in a climate chamber of Kanto-Gakuin University, Japan. Theexperiments were conducted under three different combinations of ambient air temperatureand relative humidity. It was found that skin temperatures at the upper half of the manikinsbody exposed to the supply air were decreased. Setting of task condition was fixed at first, andthen the subjects were allowed to control the environment freely after a certain period in thesubjective experiments.

Impact of non-isothermal task conditioning system on thermal comfort

Subjective tests with a desktop-based task conditioning system were conducted. Previous tothe subjective tests, detailed measurements of air velocities influenced by the system wereperformed. For subjective experiments, three ambient air temperature and relative humiditycombinations, (1) 27C/40%RH, (2) 30C/40%RH and (3) 30C/70%RH, were applied. Eachof 16 college age subjects was exposed to the three different experimental room airconditions.