This article describes the physical mechanisms leading to broadband noise from axial fans. It gives the results of a literature survey about the semi-empirical correlations available to predict this noise and their application to two examples : a low pressure fan and a high pressure fan.

Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house. This article is the second one of a serie of two. The first one was dealing with ventilation. This one mainly concerns heating system and domestic hot water production through a gas boiler. It also gives general conclusions, some of them dealing with ventilation.

Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house, fitted with a balanced mechanical ventilation system with heat recovery.

Compact ventilation appliances appeared on the market for solar passive houses. They include a heat pump to transfer heat from ventilation exhaust air to fresh air and/or domestic hot water. This article is the second part of a serie of two. It continues to describe a model for simulating the operation and performance of such appliances which was developped to be used in the TRNSYS software environment. It compares the results of calculations with those of laboratory measurements.

Compact ventilation appliances appeared on the market for solar passive houses. They include a heat pump to transfer heat from ventilation exhaust air to fresh air and/or domestic hot water. This article describes such systems and gives information about a model for simulating the operation and performance of such appliances which was developped to be used in the TRNSYS software environment.

Experiments were operated to estimate the influence of temperature and humidity on the perception of odours in the air by trained and untrained persons .

This article compares the requirements for mechanical ventilation systems in the new German regulation on energy savings (EnEV 2002) with those contained in the previous regulation (named WSchV 1995). It also gives information about the way to test and certify mechanical ventilation components according to this new regulation.

The aim of ventilation for commercial kitchens is capturing fumes and odours, providing fire protection measures and insuring comfort. But the technologies concerning extraction and introduction of fresh air are not numerous.In this article, the author explains how difficult are the dimensioning of the equipment and the calculation of the airflow to extract.The author also refers to guide and regulations related to commercial kitchens.

This study concerns single-sided natural ventilation by using a CFD model, along with analytical and empirical models. The effects of opposing buoyancy and wind forces on ventilation rates and indoor conditions were alos studied in that investigation.

Ventilation systems designed for a constant air volume (CAV) provide fresh air in office buildings. It means that very often huge amounts of energy can be wasted on ventilating empty offices. A simple analysis of the profitability of Demand Controlled Ventilation (DCV) has been performed on a reference office building in Norway.