This paper presents the estimation of air infiltration in a building using the COMIS multi-zone model. The applicability of this information in the design of buildings is demonstrated and the effect of air infiltration in the thermal performance of buildings is investigated. An integrated method incorporating both air infiltration estimation and building thermal simulation is proposed.
Swiss topography is dominated by the Alps and the Jura in the north-west part and the most densely populated "Midlands" between the two. The climatic conditions vary in a very wide range both in temperature and solar radiation due to the different altitudes and the different climatic conditions north and sourth of the Alps.Accordingly there are roughly three climatic regions. Meteo data are available as hourly values from over 70 automatic meteo stations. Derived values for hand calcualtion methods are regularly published in Swiss technical journals.
The new units of perceived air quality, the olf and the decipol, are introduced. Research using these units has been used to argue that current recommended ventilation rates are inadequate for comfort. The derivation of theunits is questioned and it is proposed that theirapplication be delayed until the methodology has been fully validated.
The purpose of this study is to test the Launder-Sharma low Reynolds number k-e model. This model is intended to improve the forecasting of aerothermal behaviour in air conditioned rooms. The model is based on the high Reynolds number k-e mode
Garages require ventilation because the exhaust fumes produced by the vehicles have to be discharged. This can be achieved with a mechanical or a natural ventilation system. A natural ventilation system has several important advantages compared w
In recent years, poor indoor climate has increasingly been seen as the cause of health problems for building occupants. Today, there is good evidence in some areas why such problems arise. Unhealthy substances given off by various building materials, the existence of mould and general air pollution are the main causes. In general, the most important way to remedy the problem is improved ventilation. Poor upkeep and maintenance have led to a decline in the performance of existing ventilation systems.
The Dutch "E'novation" program is a national demonstration program in which dwellings with high energy consumption, moisture and mould problems and poor indoor air quality were renovated, with special attention to the selection of the heating and ventilation systems, thermal insulation and the buildings' physical details. A number of indoor air quality parameters were monitored before and after renovation, showing an important improvement in the indoor air quality. Moreover, total energy consumption decreased by 33%, which meets the targets of the Dutch National Environment Policy.
Describes how basic studies (detailed simulations) have been used to define the calculation of energy losses due to ventilation in French regulations, and the "ongoing" research aiming towards a better assessment of air quality.
An effort has been made to gather the information available about duct cleaning. The emphasis in the survey was on the hygienic aspect of the cleaning of supply air ducts. Most of the literature deals with cleaning of exhaust ducts. Guidelines for the cleanness of ductsurfaces have been given by some organizations, but the scientific basis for such guidelines needs more research.
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