This study deals with the indoor air quality in five mechanically ventilated and four naturally ventilated open-plan office buildings in Copenhagen along with their occupants satisfaction. A simplified assessment procedure has been used for that study..
The results indicate that occupants in naturally ventilated offices have a lower prevalence of symptoms and are more satisfied than those in mechanically ventilated offices
In this study, personal displacement ventilation (PDV), including two cases with all seats taken and two middle seats taken, is compared with overall displacement ventilation (ODV) of all seats taken under the condition that supply temperature is 24C and air change rate is 60 l/s per workstation. The results indicate that PDV can be used in the room with big change of occupants number to satisfy the need of thermal comfort and air quality. When not all seats are taken, designers should increase supply air requirement or reduce its temperature for thermal comfort.
The aim of that study was to clarify the differences in airflow characteristics outside and at three points in a cross-ventilated room under six opening conditions: window-open; insect-screen; lace-curtain; fabric-curtain; combined condition with insect-screen and lace-curtain; and combined condition with insect-screen, lace-curtain and fabric-curtain. The air velocity was measured by four ultrasonic anemometers, during the summer of 2004. The results obtained are presented.
For that study, an investigation of indoor air microbes of two Hong Kong Old Folks Home, one with naturally ventilation and another with mechanically ventilation device, was carried out. Samples of airborne fungi and bacteria were taken from five indoor sites characterized by different human activities along with an outdoor sample for comparisonBoth bacterial counts and fungal counts in air in the naturally ventilated Home were higher than that in the mechanically ventilated Home.
The paper deals with a nation wide field study in dwellings in order to assess household exposure to indoor air pollutants and related risk factors. It has been launched by the Observatory on Indoor Air Quality (OIAQ) . About 700 dwellings were randomly selected for investigation on the main indoor air pollutants.
An information system for indoor air quality field studies, designed for surveyors, laboratories, and project coordinators, has been developed by the CSTB in order to manage the 10 millions records of the whole campaign.
Ventilation airflow rate of the occupied houses in the northern region of Japan is the subject of that study. The investigation consisted in the measurement of the ventilation rate using three different methods : the constant concentration method, airflow measurement at inlet/outlet and PFT method.
This paper presents the results of the constant concentration method, obtained with a B&K 1302 multi gas monitor and two B&K 1303 multipoint samplers and dosers., An example for the improvement of the ventilation by increasing the ventilation rate is also presented.
Ventilation airflow rate of the occupied houses in the northern region of Japan is the subject of that study. The investigation consisted in the measurement of the ventilation rate using three different methods : the constant concentration method, airflow measurement at inlet/outlet and PFT method.
The results are presented
The results of field studies in which the occupants of eight academic and office buildings, located in New Zealand, Australia, Germany, and Singapore are presented in this paper. The occupants were surveyed about their perceptions of the quality of the air in their premises, using the Probe-type questionnaire.
This paper outlines the occupantsperceptions of a range of air quality issues, as well as their overall comfort, health, and productivity. The results are presented.
An experimental and a numerical studies were performed to compare thermal comfort(TC) and indoor air quality(IAQ) in the lecture room for cooling loads when the operating conditions are changed. PMV value and CO2 concentration of the lecture room were measured and compared with the numerical results. They had a good agreement with each other. Then the authros used their numerical model to analyze TC and IAQ for a couple of operating conditions. The results are presented.
This article deals with the perception of locally applied airflow from personalized ventilation air terminal devices by tropically acclimatized people. During the experiments, 24 subjects (male and female) were exposed to local airflow from the front and towards the face at six air velocities (from 0.3 up to 0.9 m/s), their perception of air movement is similar to that of other humans. Those velocity ranges are relevant for design of personalized ventilation in practice.