Investigations in six car parks were carried out. Measurements of carbon monoxide levels were made during the peak hours to compare the performance of the different types of ventilation systems : the performance is better with a combined supply and exhaust system than the exhaust only system though more energy is consumed.
In experimental chambers, the ventilation effectiveness and thermal comfort of a task ventilation system has been investigated. The method and results of the experiment are presented in this paper. The conclusion of that thermal comfort survey is that task ventilation systems maintain the occupants thermally comfortable while saving energy.
For that study, 60 person have been tested to compare their response to personalized ventilation and mixing ventilation. The benefits presented in human response were obtained with the personalized ventilation system. The results could be improved with a further development of ventilation effectiveness.
In this study, serial environmental measurements in 12 large buildings in Taiwan have been made to control the air exchange efficiency on the indoor microbial contamination. High levels of airborne microbes seem to be more easily observed in buildings equipped with fan coil unit system than with air handling unit system.
Adequate filtration of fresh air intake should be imperative to control effectively microbial contaminations of outdoor origin.
This paper sums up the results of a study on the internal partitioning with its effects on the room air quality along with the ventilation performance. Physical tests and numerical modeling for a CFD simulation were used to evaluate different test conditions that employed mixing ventilation from the ceiling.
The method of exposure prediction using the scales of accessibility of supplied air (ASA) and the scales of accessibility of contaminant source (ACS) is presented in this paper. The spreading performance of supplied air and indoor pollutants can be figured out by CFD simulation and then used for the prediction of contaminant dispersion. For the validation of the model, a traver gas measurement was conducted.
Different measurement procedures are available for the experimental assessment of air change rates inside ventilated enclosures. These mainly consist of tracer gas techniques and can usually be applied to steady-state or moderately transient conditions and when a continuous mixing of the indoor air is assured throughout the test. However, due to the relatively slow response of the gas analysers, none of these procedures can usually be applied to fast transient phenomena that last 15 minutes or less.
This paper introduces a simple method for a natural ventilation strategic design and the evaluation of ventilation effectiveness. A simplified integrated dynamic thermal and air flow model has been developed for natural ventilation building design at the early stage. This analytic method can perform parametric studies and an optimum opening design. The indices of overheating day and ventilation sufficiency have been proposed to evaluate the ventilation effectiveness. Computer program can perform dynamic simulation for the proposed design.
Airborne particulate matter has been implicated as a major contributor to the increased incidence of respiratory disorders among people working in livestock buildings. A clear understanding of particle spatial distribution can provide important information for improvement of ventilation system
design and control strategies. In this study, the dust mass spatial distributions in three different ventilation systems were measured using a multi-point sampler in a full-scale mechanically
ventilated laboratory room under controlled conditions.
A new derivation of productivity calculation model based on pollution loads and contaminantremoval effectiveness is applied and the effect of the improved ventilation efficiency onproductivity is estimated. The findings show that the proportion dissatisfied could be asuitable predictor of productivity loss due to indoor air quality in different kinds of officework. The proportion dissatisfied is possible to calculate from olf and decipol units. In a caseof one person per 10 m2 (0.1 olf/m2) and low-emitted material (0.1 olf/m2), the total sensorypollution load is 0.2 olf/m2.
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