English

Thermal performance of climatic environments in Singapore for natural ventilation has been investigated. Weather data have been visually analyzed according to the following parameters : dry bulb temperature, relative humidity, wind speed and solar radiation . A regression model derived from 538 field survey data for natural ventilation in Singapore has been used for thermal analysis of local climate.
The conclusion of the authors is that comfort indoor environment could be achieved by natural ventilation for residential buildings in Singapore.

The need of cooling schools in Scandinavia is only for a short period of time .The ventilation system often cannot provide the necessary cooling without causing draught. So an additional cooling by an internal high velocity system has been introduced that cool people . A downward air stream of five minutes duration is created by that system that blows the rising thermal plume above a person away.

In this paper, thanks to the method of numerical simulation, the influence of building factors on indoor thermal environment of natural ventilated building is analysed . It is proved that the rate and the schedule of natural ventilation are very important factors that influence the indoor thermal environment of builidings in cold zone.

For that study, experiments were carried out to evaluate thermal comfort in highly airtight and insulated rooms, where floor heaters and air-conditioners were installed. Three air temperature conditions were applied for each of airconditioner or floor heating tests.

Indoor air quality (IAQ), is one of the key determinants of the acceptability of indoor environments. The computational approach, based on computational fluid dynamics (CFD), is used more often than the experimental approach to study IAQ problems . The software Airpak 2.1 is used to simulate air flow organization and thermal comfort of an office. The aim is to facilitate the production of dynamic multifaceted structure that could be used to improve the quality of indoor environments and help maximize the potential of its inhabitants.

In the aim of investigating the thermal environment and thermal comfort in residential buildings in Harbin, northeast of China, a field study was performed on a total of 120 participants during the 2000-2001 winter. To collect the measured parameters of the indoor environment, the Predicted Mean Vote and Predicted Percentage of Dissatisfied, an indoor climate analyzer along with a thermal comfort meter made in Denmark were used . The results are presented.

This article deals with the effect of a photocatalytic air purifier on perceived air quality tested in rooms polluted by typical indoor pollution sources. The rooms were ventilated at three different outdoor air supply rates. The results show that the outdoor air supply rate can be supplemented by a photocatalytic air purifier when the indoor air is polluted mainly by building-related sources.

Low humidity in the aircraft cabin environment appears to be a possible cause of symptoms experienced during long flights. For that study an aircraft cabin with realistic pollution sources was built inside a climate chamber, it can provide fresh outside air at very low humidity . Four groups of 16-18 subjects were exposed to the four conditions of outside air supply rates. - 1.4, 3.3, 4.7 and 9.4 L/s per person (3, 7, 10 and 20 cfm/p) - yielding average humidity levels of 28%, 16%, 11% and 7% RH, respectively. Results and conclusion are presented.

The aim of that study was to observe if a 25-30% reduction of outdoor ventilation flow, during heating season, influenced the perception of the indoor environment. The importance of the combination of technical measurements with a longitudinal evaluation of occupant's reactions is underlined.

This article presents the results of a US department of energy's building technologies program whose aim is to create technologies for low-cost-near-zero energy residences equipped with geothermal or dehumidifying heat pump, insulated panels for the walls, roof and floor, solar system. In this paper a comparison between 4 Zero-Energy-Houses and a traditionally built residence is made . Energy use and construction costs are presented.