Effect of internal partitioning on indoor air quality of rooms with mixing ventilation - basic study -

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.

Prediction of transient contaminant dispersion and ventilation performance using the concept of accessibility

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.

Measurement of the air change rate and ventilation characteristics during short term transient phenomena

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.

Strategic Design Method for Natural Ventilation in Buildings

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.

Effect of ventilation system on particle spatial distribution in ventilated rooms

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.

The effect of perceived indoor air quality on productivity

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.

New air terminal devices with high efficiency for personalized ventilation application

Two air terminal devices (ATD) for personalized ventilation (PV) were developed: RoundMovable Panel (RMP) and Headset-Incorporated Supply (Headset). The performance of theATDs was tested at three combinations of room air temperature and supply personalized airtemperature: 23/23C, 23/20C and 26/20C, respectively, and at different flow rates ofpersonalized air, ranging from 5 to 15 l/s for RMP and from 0.18 to 0.5 l/s for Headset. Abreathing thermal manikin was used to evaluate the inhaled air quality achieved with thedeveloped ATDs as well as the performance in regard to thermal comfort.

Improvements of ADPI and ventilation effectiveness of a classroom by a dedicated outdoor air system

School indoor air quality has become of concern recently in Korea. In this paper, it is intendedto investigate the ventilation performance and thermal comfort characteristics of a classroom,when an outdoor air system is installed in addition to a ceiling-mounted heat pump system.Experiments were conducted in a full-scale model classroom to collect experimental data tovalidate numerical schemes. Three-dimensional temperature distributions were measured withthermocouples distributed throughout the space, and ventilation effectiveness was measuredusing a tracer gas technique.

The influence on ventilation efficiency in typical dwelling with floor-based displacement ventilation

The characteristics of the climate in Taiwan are high temperature and humidity. In order to solvethese basic problems in dwellings, a meteorological station was established in Fulong(northeastern part of Taiwan) to document the detailed microclimatic information of indoor andambient environments during 4 years. According to the hydrodynamics and thermal mechanics,the new ventilation strategy was developed with the thermal mass cooling-down systemconstructed as the porous floor in a full-scale climate chamber.

A study on effective ventilation strategy to remove pollutant in an isolation room of a hospital

This paper investigates the pollutant distribution patterns in a ‘negative pressure’ isolation room by means of objective measurement and CFD modelling. The isolation room has two air supply diffusers and two extract grilles mounted in the ceiling. Numero