In order to save energy, i.e. ventilation heat losses, the fresh air change rate should be adapted to the prevailing need. Even though it is a fact that reducing the fresh air change rate will result in a ventilation heat gain, the fresh air flow rate should not be kept too low, so that pollutants, humidity and body odour can accumulate. The results of measurements in a climatic chamber and in a lecture theatre show a significant relationship between the concentration of carbon dioxide and body odour of the indoor air under nonsmoking conditions.
One of the most important reasons for ventilation of dwellings is moisture control. Ventilation strategies differ. The article deals with 1) Ventilation as a measure for moisture control in dwellings: comfort aspects, durability aspects, air humidity and ventilation: 2) Principles for risk analyses; surface phenomena, moisture conditions within buildings components; 3) Ventilation requirements in different climates; climatic data for different climatic zones, principles for moisture- ventilation analysis, and analyses of the examples.
This research attempts to offer partial answers as to how and why inhabitants of a rented apartment building behave as they do in aeration. The authors adopted a two-fold approach : first, by using computerised data recording of outdoor and indoor temperatures per room, the number of hours of sunshine, the surface temperature of radiators and the opening of the windows in each room;second, through interviews with the tenants, sometimes filmed, in order to ascertain their behaviour patterns and underlying motivations in ventilation.
SINTEF, The Foundation for Scienti f ic and Industrial Research at the Norwegian Institute of Technology, has monitored a number of experimental low-energy houses, and also undertaken measurements in some other houses to establish the energy consumption, air tightness, ventilation rates etc. Some of the experimental houses are extremely air tight. In connection with these measurements we have made some observations on the occupants behavior related to ventilation, and their satisfaction with the ventilation system.
A group of 18 identical well-insulated experimental houses in Sweden, utilizing a user controlled exhaust fan ventilation system, was monitored during 1985- 1986. The ventilation rate can be controlled by the user by adjusting the fan speed with a conveniently located three-way switch. No heat recovery is provided for, the idea being that the average ventilation rate will be low, thereby saving energy. The houses are described. The results from measurements of ventilation efficiency, ventilation rates. run time of fan speeds and energy consumption are presented.
In France, most of the ventilation systems in dwellings now consist of exhaust vents linked up with a fan, and air inlets. A survey conducted by the CSTB shows that actual ventilation rates are frequently different from prescribed values and that a lot of problems encountered are related to occupant behaviour, - The duration of exhaust flowrate peak value was measured ; it was shown that this duration was dependent on the kind of command and its location in the room. - draughts through air inlets were a major concern. - a lots of air vents did not operate correctly because of fouling.
In this paper we approach the subject of ventilation and occupant behavior in multifamily buildings by asking three questions: 1) why and how do occupants interact with ventilation in an apartment building, 2) how does the physical environment (i.e., building characteristics and climate) affect the ventilation in an apartment, and 3) what methods can be used to answer the first two questions. To investigate these and other questions, two apartment buildings in Chicago were monitored during the 1985 - 1986 heating season.
An energy efficiency monitoring programme was carried out from 1984 to 1986 by the South London Consortium Energy Group, United Kingdom Department of Energy, with assistance from British Gas, Watson House, as part of a demonstration project funded by the United Kingdom Department of Energy, the EEC and SLC Energy Group. 18 occupied low energy houses were thoroughly instrumented in order to monitor energy usage and occupant hehaviour.
After years of intensive studies on indoor air pollution sources, pollution levels, condensation effects, building airtightness, and air change rates, we are now at the point to discover that no solution whatsoever to the ventilation problem is possible if compatibility with user comfort and user habits are not properly taken into account. User compatibility of aventilation strategy under todays conditions in dwellings must in fact be understood as a requirement equivalent to the purely functional ones of pollutant removal and of economy.
The buildings built according to the latest construction technology aiming at energy saving are as tight as possible. The ventilation of a tight building has to be completely mechanical (supply and exhaust a i r system). The heating of the building can also be included in the mechanical ventilation system with small additions. The new warm air heating system developed at the Laboratory of Heating and Ventilating of the Technical Research Centre of Finland is therefore called ventilation heating system.
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