Sick syndrome episodes were reported by the employees of Athens Air Traffic Control Tower (ATCT). In this study recent indoor air quality measurements made in ATCT are presented and discussed. The data indicated that VOCs concentrations were above outdoor levels in certain places of the building, some actions were taken to improve the indoor environment and afterwards a second set of measurements were made, inside and outsite the ATCT building : the results indicated an improvement of the indoor air quality.
To satisfy the optimal environment in agricultural buildings, much effort is made to controlventilation rate and indoor temperature. However, distribution of fresh air is equally important for animal performance and welfare. So far, no sensor is available to measure and to control airflow pattern continuously in a ventilated building. Therefore, an airflow pattern sensor was developed to measure the trajectory of a nonisothermal air jet in a building with a single or multiple air inlet(s).
Nowadays, the need to keep indoor air quality under control is widely known due to the fact that people spend most of their time indoors. In order to show a useful working-tool this paper aims to present a guide to evaluate indoor air quality. This work was structured in the following stages: visual inspection, check list, data analysis, experimental measurements of the physical and chemical pollutants and an analysis of the improvement of indoor environmental quality.
The development of a new device for the injection of tracer gas is discussed with the objective of practical application in the field of HVAC airflow measurements. The uniform tracer gas dispersion for very short distances, when measuring airflow by the constant emission method is of great interest. This new injection device has a compact tubular shape, with magnetic fixation to be easy to apply to duct walls. After a preliminary study with an initial prototype already tested, further detailed experiments had been carried out, culminating in a second prototype.
Experiments have been carried out to measure unsteady velocity fields near the coughing subject (mannequin) and also understand unsteady transport process resulting from this type of transient flow. Representative human cough waveforms were reproduced using a flow simulator and the measurements were made using Time Resolved Particle Image Velocimetry (TRPIV). Initial high velocity as well as rapid velocity decay with time and distance were observed, and velocity time history and vorticity variations were characterized.
In this paper a new test room for thermofluidynamic measurements is presented. The tests have been realised in the Officine Volta (Italy) workrooms as result of a collaboration between researchers of the Department of Fisica Tecnica University of Rome La Sapienza and researchers of the Officine Volta society. The laboratory was thought exploiting the knowledge in the field of thermofluidynamic achieved by the department of Fisica Tecnica in the last few years.
We present a method capable of measuring the velocity field in a 7.00m x 3.50m plane of a large-scale Rayleigh-Bénard (RB) experiment using an adapted Particle Image Velocimetry (PIV) technique. The structure of the flow in RB convection is well known for
Arthur Rosenfeld cited a study showing that the huge link between IAQ and productivity in anoffice building and the serious initiative to improve indoor air quality will have a tremendous return. This study attempts to analyze the working spaces with different variances. The chamber measurements in the laboratory constructed in Shu-Te University will be taken, and the numerical simulation using CFD techniques will also be applied. The results from both should be compared. The different inlet layout of HVAC system, especially the UFAD system, and the boundary conditions will be discussed.
This paper reports experimental measurements on the diffusion of confluent jets thatform a wall jet. The experiments were carried out at a fixed air flow rate and fixed temperaturedifference between the supply and room air in the cooling mode. Based on these experiments, theresults presented show the behaviour of the wall confluent jet in the form of velocity profiles, thespreading ratio of jet on the wall, etc. The empirical equations derived are compared with othertypes of air jets, such as the free confluent jet, free plane wall jet, and free plane jet.
The air exchange rate is a determinant factor for the indor air quality in a given spaces. If it is lower than the required it may cause the so caled sick building syndrome. The ultimate result depends, obviously, also on the nature and strength of the sources emisions. In this work the natural