English

The design of ventilation performance of air-conditioning systems in residential buildings is not quite established. In this paper findings from a recent study of the ventilation performance and IAQ in a master bedroom in Singapore are presented. The need to design for ventilation provision in split system air-conditioning units is suggested by the findings.

In a VAV system, it is possible to minimize the energy use with an optimal supply air temperature. The theory for such a device is presented. The analyses show that controlling the supply air temperature in an optimal way results in a decrease of HVAC energy use compared with a constant supply air temperature.

A PMV (predicted mean vote) index is often adopted to assess the thermal comfort conditions of thermal moderate environments, but to prevent problems when monitoring or controlling HVAC equipment a fuzzy adaptive controller has been introduced. That paper gives a description of the method along with the presentation of simulation results .

The main aim of that study is to assess the status of natural ventilation in a typical four-room HDB (Housing and Development Board) flat in Singapore using scaled model in the wind tunnel and also to develop an effective passive or active stack system to enhance natural ventilation in the flat.

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.

Designing an HVAC system has different aims, the first one is to satisfy the user with a long-term functioning system in the most energy efficient way and the second is to increase the supply air flow. So the main objective of this paper is to give the fundamentals for a system design that takes into account the 3 factors. The benefit of a pressure controlled variable air volume (VAV) system is presented .

A supply air window enables the pre-heating in winter of ventilation air before it enters the room.The window device must entrain into the room the air flow that would otherwise escape, it allows the absorption of the solar radiant energy and a low emissivity coating within the glazing assembly must be correctly located. To achieve a better performance of the window, tests were carried out. A simulation model was built and comparison of the results were made.

This study aims at demonstrating that semi-quantitative dampness/mold exposure indices can predict existence of excessive building-respiratory symptoms and diseases. Those findings justify action to correct water leaks and repair water damage in ordre to prevent them.

For that study, 24 healthy non-sensitive persons were tested to analyse the respiratory effects caused by exposures to office dust. The results of the study suggest that most of the tradiitional risk factors can be rejected as single responsible risk factor.

This paper is a clear presentation of the different available systems to ensure a good thermal comfort : the author starts with passive systems that maintain comfort without an extra energy consumption, carries on with the low-energy consumption systems that allow air refreshment ,
then refreshing floors and cool ceilings and low-speed ventilation are described , he ends with
air-handling devices to be installed in residential or collective housings.