A low energy office building in Frankfurt (Germany) with water heating/cooling from ceilings was submitted to detailed measurements during two years, in the frame of a demonstration project. Results are given showing thermal comfort and energy consumption data.

Fan is a source of noise in ventilation and air conditioning systems. The article provides information about noise emission from different types of fans and the ways to attenuate it, using different types of silencers, including passive and active silencers, or combination of both.

Measurements results are compared with calculations for predicting the broadband noise from low and high pressure axial fans.

This paper is based on the results of Subtask B of the HybVent Project. It presents a critical review of the literature and recent developments in analysis methods for natural and hybrid ventilation in buildings. Ideally, analytical methods aimed at modelling hybrid ventilation systems should incorporate at least three key aspects i.e: the natural ventilation mode, the mechanical ventilation mode and the control strategy. Depending on the input parameters used within the control strategy, thermal comfort and indoor air quality related parameters may also need to be predicted.

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 .