English

This paper presents a numerical method to estimate the concentration of occupant-generated C02 for the occupancy found in elementary school classrooms with nonforced ventilation.

The mathematical model described in this paper relates position, velocity and aerodynamic Torque characteristics of air dampers. That model has been has been developed and tested experimentally : the results demonstrate its accuracy.

A framework and computer code has been developed in that study for coupling building energy and load calculations with room air models.

In this paper, practical recommendations for design and operation of HVAC systems are presented. The result of a proper maintenance will be less pollution and a better indoor environmental quality.

This paper gives the description of the outline of a methodology whose aim is to decrease or even eliminate the emissions resulting from building materials.

The author, basing on the present knowledge on healthy indoor air, asks for a reenforcement of indoor environment in Europe, without delay.

The aim of that study was to carry out an air quality survey of 10 homes with flueless heaters fuelled by natural gas. Procedure, instrumentation and results are presented along with a comparison of survey date with guidelines.

In this article, the sources of risk using DCV (demand control ventilation) are examined along with the components typically and the possible ways to minimize risk without sacrificing potential energy savings.

Recent studies in Switzerland showed that in large non residential buildings, which can be compared for typology and ventilation needs, the consumption of electricity for mechanical ventilation can vary considerably from case to case. Moreover in such a building it represents a percentage not negligible of the whole consumption of electricity. We had a confirmation of that behaviour with a study we made during 1999-2000 on a set of eighty air treatment units of the Civic Hospital in Lugano (Southern Switzerland).

Hybrid ventilation is one promising approach to reduce energy consumption in office buildings. On the one hand, a minimum air change rate is supplied to the rooms, even if the windows are closed. On the other hand, the energy demand for ventilation can be reduced if natural forces (wind and buoyancy driven air flow) are used to ventilate the building. The user behaviour has an important but often unknown influence on the thermal building performance and the indoor climate. Thus, an accurate user model should be used in designing hybrid ventilation.