In order to investigate the difference between mixing (MV) and displacement ventilation (DV) under different boundary conditions, a numerical simulation with a validated CFD model of several types of buildings was used. The comparison shows that DV can maintain a thermally comfortable environment under a very high cooling load .

In this paper, three methods of recovering sensible heat during heating and ventilation process of heat pump have been studied experimentally. For the experiment an air-source heat pump system with none, single and double heat recovery facilities has been built and tested in two constant-temperature and constant humidity thermal chambers.

For that study a field survey on indoor environment in 10 office buildings with displacement ventilation was performed. The responses of 227 occupants were collected and analysed. It appears that combined local discomfort because of draught and vertical temperature difference is not a serious problem in rooms with displacement ventilation.

A case study is presented in this paper regarding the fine particulate matter and its carbonaceous compositions in six residential homes in Hong Kong. The characteristics and relationship of Organic Carbon and Elemental Carbon have been discussed indoors and outdoors. A simple model indicated that carbonaceous particles found indoors consist of about 2/3 of outdoor sources and 1/3 of indoor sources.

Porous building materials are sources of indoor air pollutants such as VOCs and strong sinks of these pollutants too. To control the indoor VOC concentration levels and to determine the best ventilation requirements for an acceptable IAQ, the knowledge of VOC transfer mechanisms in these materials is a necessary step. The analytical model presented in this paper can predict both primary and secondary VOC source or sink behavior of porous building materials.

For that study, 1014 pupils from 8 schools were questionned in the aim to study asthma and allergy in relation to diet and the school environment. Most of the classrooms fulfilled the ventilation standard, but despite that, cat, dog and horse allergens were found at high level in most of the classrooms. The authors also found interaction between dietary factors and allergen levels.

Identifying health improvements in the upper and lower airways of office workers was the aim of that experimental field study. The results show that the installation of electrostatic air cleaners reduces the total airborne dust concentration in offices by up to 46 % . That reduction is observable for all particle sizes.

For that study a seated computational thermal manikin (CTM) is used to study the microenvironment around human body with or wihtout personalized ventilation system (PV). The introduction of Pollutant exposure reduction and personalized air utilisation efficiency as new evaluation indices has been made.

Concerning house ventilation, occupants are aware of the necessity of suppressing the vicious air but less of the obligation of entering outside air. For cost savings, air-intake for ventilation is generally located on the frame of windows, but the author thinks it is wrong, it ought to be positioned either in the concrete or in the shutter coffer to get windows thermally and acoustically performant.

The characteristics of the building that has been renoved according to the german standard "pasive house", are presented. A comparison of the energy consumption has been made between the existing building and the renoved one : it is 85 % lower for the renoved building. All the more, the rehabilitation brings comfort for the user, is satisfactory on an ecological point of view and economically optimised.