User perceptions of indoor air quality in a range of large-scale faciilties, with natural and mixed-mode ventilation - field studies in Australia, Germany, New Zealand and Singapore

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.

Indoor air quality and thermal comfort in the lecture room with four-way cassette air-conditioner and ventilation system

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.

Human perception of local air movement and the acceptable air velocity range for local air movement in the tropics

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.

The appropriate choice on control mode of task-ambient air conditioning

The individualized control air conditioning mode can meet different needs of occupants to a greater extent than the traditional total-space air conditioning mode.In this paper, the authors consider that the total supply air system with variable air volume (VAV) box is appropriate to provide acceptable comfort and good indoor air quality.

Performance evluation and comparison of two air terminal devices for personalized ventilation

Two prototypes of air terminal devices (ATD) for personalized ventilation have been developed for that study : the Circular Perforated Panel (CPP) and the Desktop-mounted Grille (DMG) . They have been tested and their performance with regard to inhaled air quality and cooling effect was compared.

The aircraft seat as indoor air quality and temperature control system

An aircraft seat has been designed and constructed with displacement ventilation in the headrest. Tracer gas experiments revealed contaminant removal efficiencies up to 96% in the breathing zone. Local supply of air near the breathing zone of the passengers minimizes the amount of air, enables some humidification and could give some protection against infectious diseases.
The results of measurements are presented in this paper.

Human response to an individually controlled environment

An individually controlled system (ICS) at room air temperatures of 20, 22 and 26°C has been tested by forty-eight subjects . Human response to a reference condition without the ICS at a room air temperature of 22°C was also collected. The results reveal

Carbon dioxide concentrations in classrooms and association with student performance : a preliminary study

Data linking poor IAQ in the classrooms to student performance is limited. This study explores the student performance on standardized aptitude tests that are administered to students on a yearly basis,in parallel with classroom carbon dioxide concentrations. Data on classroom conditions and carbon dioxide concentrations (were recorded in 5th grade classrooms in fifty four schools within a Midwestern school district in the USA. Preliminary results are presented in the paper.

The effects of class-room air temperature and outdoor air supply rate on the performance of school work by children

A field experiment was conducted in two classes of 10-year-old children. Average air temperatures were reduced from by 3 degrees and outdoor air supply rates were increased , each condition lasting a week. 8 different aspects of school tasks were performed during appropriate lessons . Besides the children indicated SBS symptom intensity. This experiment indicates that the improvement of classroom conditions can substantially improve the performance of schoolwork.

Impact of dynamic airflow on human thermal response

Airflow fluctuation is an important factor that affects indoor thermal environment and human thermal response. In this paper, the influence of three kinds of airflows : constant airflow, imitating natural airflow and sinusoidal airflow, on thermal comfort is studied.

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