In Korea, almost all flats have the structure of concrete that is cast in forms and ties are used tofix forms. Tie holes are usually filled with cement mortar. Instead of filling the holes in the balcony, they might be used as trickle ventilators. If they do not satisfy completely the ventilation requirement, other ventilators will be needed. The objective of this study is to assess the ventilation performance of these natural ventilators.

Increasing ventilation rates do not always improve IAQ, but proper ventilation strategies are the keys to improve it. This paper discusses the impacts of ventilation on IAQ and some ventilation strategies to improve IAQ are proposed : the low-temperature air supply system, DCV (demand control ventilation) system, TSV (task supply ventilation) system.

Experiments were conducted in the mockup of a Boeing aircraft cabin section located in the BESS(Bioenvironmental Engineering Structure Systems) lab at the University of Illinois at Urbana-Champaign. The objectives of this experiment study included characterizing air distribution using VPTV (velometric particle tracking velocimetry) technique and determining local mean age of air in the ventilated airspaces and ventilation effectiveness using a tracer gas method to evaluate the performance of ventilation systems in removing airborne pollutants.

The paper explores whether replacing old windows, in a significant proportion of UK dwellings, could reduce air change rates below recommended levels unless additional controllable ventilation is installed at the same time as new windows.For that study, the authors have identified a sample of dwellings that were to have complete window replacement, then carried out fan pressurisation measurements before and after replacement in order to assess the impact on the UK building stock as a whole.

The present study determines the particle decay and deposition rates under natural, forced ventilation and no ventilation conditions. It is the first attempt to apply this deternmination to the ventilation conditions existing in Indian urban households.
The study confirms the previous deposition rate observations and most of the values are in the range of the previous reported values.

For that study, IAQ was measured and evaluated in seven representative hotels in Beijing. The evaluated places included the hall, restaurant and guest room.There were different pollutionlevels in different hotels due to differences in sources, location, human activities and ventilation, etc. Within the same hotel, different areas had different IAQ. This study is based on measurement data and associated with domestic and overseas related standards, but it needs further validation and improvement

A new zoning approach is developed in this paper. The main issue of the new approach is that zoning should be based on the distributions of flow field and the zoning results should indicate the uniformity of zones in space.In this work, air age is adopted as a basis for zoning in mechanically ventilated rooms. For the demonstration of the applicability of that new approach for predicting indoor temperature in a displacement ventilated room, a case study is performed. Comparisons of the results with those of a CFD model are presented.

This paper uses a CFD tool to study indoor air quality in a typical chemical laboratory. The research explores the performance of ceiling-supply mixing ventilation systems and side-wall-supply displacement ventilation with their effects on hood containment.The results of the two systems are presented.

The FANROOMLESS ventilation system for underground parking lot presents several unique characteristics. First, this system can reduce initial construction cost and uses the spaces moreeffectively by optimization of the ventilation facilities. Second, fan noise during operations can be reduced to under 65 dB(A). This study also presents the required exhaust rate (m3/hm2) to maintain acceptable CO level of25 ppm in accordance with the code. The data can help to calculate the required exhaust rate.

The purpose of the research at the first stage was to find out whether the new ventilation mode - stratum ventilation - is feasible. The system uses a large supply inlets located at the side of a room. A case study, a typical office in Hong Kong is used to illustrate that new mode.