3rd AIVC Conference - London, UK - 20-23 September, 1982

The 3rd AIVC Conference - Energy efficient domestic ventilation systems for achieving acceptable indoor air quality, was held in London, UK, 20-23 September 1982.

Contains 29 papers.

3rd AIC Conference: Energy efficient domestic ventilation systems for achieving acceptable indoor air quality (Book of Proceedings)

Contains 23 papers as follows: Keynote Paper The art of ventilation; Use of natural ventilation; Variations in householders' window opening patterns; Avoiding condensation and mould growth in existing housing with minimum energy input; Ventilation rates in relation to emission of gases and vapours from building materials; Ventilation and internal air movements for summer and winter conditions; A comparison of alternate ventilation strategies; Ventilation and energy consumption.

Reduction of air infiltration and the development of controlled mechanical ventilation in France.

Since 1974 the french Authorities have insisted on energy being saved in all buildings. There was very strong pressure on manufacturers to obtain better sealed window frames . In practise less than two or three meters cubed per hour at a pressure of ten pascals penetrates. Also television campaigns have insisted on weather stripping all windows and window frames in all old buildings. The result of these campaigns is that all buildings with no or natural ventilation systems actually have indoor condensation problems.

Ventilation heat loss in a detached one family house.

For optimum building design it is of importance to investigate the comfort and the energy conservation obtained with different types of ventilation systems and levels of airtightness of buildings. This could be achieved by aid of computer models based on full-scale and model measurements. In order to obtain experimental data as input data to such a computer model, an experimental, detached one-family house has been built near to Gothenburg on the Swedish west coast.

Heat losses from small houses due to wind influence.

The heat losses from small houses, due to transmission and ventilation, are estimated. The estimation i s based up on the house owness daily readings of electricity and water meters, and their notes on behaviour influencing the energy use. Consideration is taken to heat supply from insolation and from people. Hot water losses are calculated from use of water and use of household machinery. Besides the estimation of the heat losses, Q, wind and temperature in the area is registrated .

Ventilation patterns of windows and adjustable natural ventilation systems.

Measurements in a test room of 28.4 m3 located at the top of a 3-storey building have been made to determine ventilation rates of different natural ventilation systems. The systems under consideration were windows which are typical for residential buildings in Germany and various adjustable natural ventilation systems for installation in walls or window frames. The measurements take into account parameters such as inside/outside temperature differences, wind velocity and direction, opening position and location of thedifferent systems.

Ventilation and energy consumption. Practical experience of problems related to ventilation in single family houses.

Discusses the problems of designing ventilation for small houses. Small houses are considered to be far too elementary and there is no total view of the balance of energy and no regard for the interplay between different flows. Mechanical ventilation is often not controlled or inspected in small houses. Recommendations are: increased knowledge, differentiated requirements on ventilation, inspection of systems, definition of comfort criteria, changed conditions for heat recovery, and well-documented requirements for air tightness.

The impact of ventilation and airtightness on energy consumption.

The total energy consumption for five detached houses with air change rates of around 3 per hour right after construction, was measured and compared with estimated values, over a three-year period. Air change in the bedrooms was also measured. It was found that the recommended value was only obtained in very tight houses. If two windows are open, the ventilation system is partly short-circuited. A modified exhaust air ventilation system was designed to provide a sufficient air change in the bedroom with a reduced total air changein the house as a whole.

On flow in narrow slots applied to infiltration.

The normally used equation for calculation of infiltration flow rates into a house is a power law of which the exponent n is normally assumed to be 0.66 but sometimes values of 0.5 or even 1 can be seen in the literature. In this paper the constant n is calculated assuming a non fully developed infiltration flow. The constant n will for this assumption take values between 0.67 and 0.77 if the slots where the flow takes place are long enough to get a flow close to a developed one.

Natural ventilation in the UK and some considerations for energy efficient design.

This paper discusses the potential for achieving an "energy-efficient" ventilation system by improving design procedures for natural ventilation. It considers ventilation requirements and the meaning of the term energy-efficient ventilation. Both of these topics are of fundamental importance to any design procedure. Natural and mechanical ventilation systems are discussed. This is done because natural ventilation is often compared unfavourably with purpose-built mechanical systems. It is argued that such comparisons can be misleading, unless all aspects are considered.

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