Measurements and prediction of inhaled air quality with personalized ventilation

This paper examines the performance of five different air terminal devices for personalized ventilation in relation to the quality of air inhaled by a breathing thermal manikin in a climate chamber. The personalized air was supplied either isothermally or non-isothermally (6 C cooler than the room air) at flow rates ranging from less that 5 l/s up to 23 /s. The air quality assessment was based on temperature measurements of the inhaled air and on the portion of the personalized air inhaled. The percentage of dissatisfied with the air quality was predicted.

A study of thermal comfort in an office environment with floor return type underfloor ventilation system

Thermal comfort (PMV and PPD indices) of a floor return underfloor ventilation system was evaluated through experiments with different supply air temperatures and internal heat loads. Results are shown and analysed.

The effects of a personalized ventilation system on perceived air quality and SBS symptoms

Experiments with 30 human subjects were performed in an office equipped with personalized ventilation systems (individual control of flowrate and direction) for 6 workers and with different supply air temperatures to analyse perceived air quality and sick building symptoms.

Evaluation of thermal comfort in ceiling cooling system

Thermal comfort obtained with a ceiling cooling system was investigated through experiments with human subjects. Results give their perception of thermal comfort and its relationships with skin temperatures measured at several parts of the body.

Numerical calculation of mean radiant temperature and temperature assymmetry for complex room geometry

This paper proposes an algorithm based on the computation of view factors to evaluate the mean radiant temperature in a room with a complex geometry.

Measurement of the airflow and temperature fields around live subjects and the evaluation of human heat loss

A special garment was developed to measure heat transfer coefficients (convective and radiative) of the clothed human body. It was tested on male subjects operating seated office work in a environmental room. The measured convective and radiative heat transfer coefficients are in good agreement with the PMV model and a number of previous publications.

Evaluating the thermal quality of a room

The paper describes a measurement system developed by Dantec to evaluate room thermal comfort according to ISO 7730 standard (determination of PMV and PPD indices).

The impact of humidity on health and comfort in an office building

Monitoring of temperature and relative humidity was carried out in an air-conditioned office building during the heating season. In addition, occupants filled in health and comfort questionnaire. Without informing the occupants, humidity was reduced in an experimental area compared to the control area. As this reduction was not so great (2% relative humidity), the differences of occupants perception between areas are not significant. A slight reduction of building related symptoms was observed at higher humidity.

Field investigations on comfort in office buildings

A method based on both measurements and questionnaire has been developed to investigate comfort in office buildings. The measurements apparatus records temperature, humidity, noise, light, odours and occupant's perceived comfort. The questionnaire contains information about indoor climate and working environment. Results are given and analysed for 60 offices in France.

Effect of replacement of air systems on kitchen comfort

The impact on thermal comfort of the way of introducing replacement air (to replace air being exhausted by the hood) in a kitchen was analysed using mathematical models and laboratory experiments with a tyhermal mannequin. Results allow to rank systems for replacement air introduction from the most to the least tolerable : displacement ventilation, mixing ventilation with ceiling air diffusers, front-face discharge and backdrop plenum.

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