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.

How much do we really know about ventilation ?It is admitted that for a good indoor air quality in a building, the amount of outdoor air ventilation is one of the most important determinants , but many critical questions and misunderstandings exist :Do we know the quantity of outdoor air is even needed in buildings? And about the ventilation requirements : they treat all the huge variability in buildings the same.

This paper, after a general presentation of what indoor air quality is, discusses the development of new methods for the improvements of IAQ in maintaining or decreasing ventilation and energy use.

The design of "simple" ventilation systems in compliance with Standard 62-2001 Addentum 62n requirements has already been discussed in articles. This paper focuses mainly on the design of a more complex set of ventilation systems, namely single-path multiple-zone recirculating systems.The calculation procedures to reduce both underventilation and unnecessary over-ventilation are clarified and help for determining system ventilation efficiency.

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.

The design and realisation of natural ventilation systems is an important research topic into the ability of buildings to respond to climatic conditions, using parts of the buildings themselves as indoor microclimate control systems. This research aims to evaluate how the stairwell can be an essential element of natural ventilation in low-rise buildings. In this study, the main innovation is the different architectural and functional conception of traditional building components such as the stairwell.

The performance of three different ventilation systems in cold climate homes is discussed. Comparisons are presented of monitored datasets by contrasting operations of the three ventilation systems, the energy impacts on the overall HVAC systems, and resulting indoor environmental conditions. Whole building simulation results, based on ventilation system models using EnergyGauge and validated in part by the monitored datasets, provide normalized comparisons of HVAC system energy use.

This work presents simulations results exploring the influence of the building air-tightness on the energy consumption of buildings for different hypothesis on the type of ventilation system. It shows that the energy impact is different depending on the ventilation system, and that buildings ventilated with a supply-extract ventilation system, even those without heat exchanger, are much more sensitive to air infiltrations than buildings ventilated with an extract ventilation system.

The hybrid ventilation systems have been widely used for livestock barns to provide optimum indoor climate by controlling the ventilation rate and air flow distribution within the ventilated building structure. The purpose of this paper is to develop models for livestock ventilation systems and indoor environments with a major emphasis on the prediction of indoor horizontal variation of temperature and concentration adapted to the design of appropriate controlling strategy and control systems.