AIVC - Air Infiltration and Ventilation Centre

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mechanical ventilation

People and ventilation - considerations with regard to the economical application of engineering methods for ventilation. Mensch und Raumluft - Gedanken Zum wirtschaftlichen Einsatz luftungstechnischer mabnahmen.

Defines requirements for suitable indoor air quality and examines the technical and economical possibilities of suitable methods of ventilation. Differentiates between densely populated places (meeting places) and others of low occupancy, such as offices and living rooms. Finds that the most efficient way of satisfying hygiene requirements is by controlled air renewal, and that to achieve this mechanical ventilation according to DIN 1946 should be installed.

The effect of mechanical ventilation on the air leakage characteristic of a two-storey detached house.

Measures air change rates in a 2-storey detached house with operation of various types of mechanical fresh air ventilation systems. Studies 4 systems, including 2 balanced systems and 2 exhaust-only systems. The forced ventilation rate is controlled at 0.15, 0.25, 0.4, or 0.5 ach. Develops expressions for the test house relating the house air change rate under winter conditions to the forced ventilation rate and the infiltration rate due to wind and temperature difference.

Aspects and trends of building physics with regard to energy saving construction.

Stresses need to introduce sensible energy conservation measures into building and warns against superficially attractive solutions. Discusses reduction of ventilation heat loss by installation of mechanical ventilation incorporating heat recovery. Illustrates a mechanically ventilated dwelling with fresh air drawn into living areas and exhaust air leaving via the kitchen and WC. Treats further examples of mechanical ventilation which are adjusted according to necessary ventilation rates. Concludes by discussing trends in building construction concerned with conserving energy.

Study of a house with mechanical ventilation (exhaust/supply) and heat exchange. En granskning av ett FTX-ventilerat smahus.

Investigates excessive energy consumption in a house mechanical ventilation and heat exchanger. Explains why the house consumes so much energy. Analyses the ventilation system and defines a "coefficient of performance". Such a factor could characterise the energy requirement of a ventilation system. Emphasizes that the ventilation system is to be regarded as an entire system and that a certificate for the exchanger does not guarantee that the totalsystem will perform satisfactorily.

Draft Standard for ventilation systems. Forslag til NKB-norm for ventilasjonsanlegg.

Provides basis for planning and installing plant for maintaining indoor climate based on previous draft which is based on earlier Danish Standard. Refers to several salient design criteria including leakage factors at given test pressure, maintenance of climate parameters, air quality, anticipated energy consumption. Gives example table for requirements of building in terms of m2/person depending on application. States example tolerances of air flows.

Ventilation system efficiency - existing system's potential. Ventilasjonssystemers effektivitet - muligheter for eksisterende anlegg.

Notes that many air conditioning and industrial installations function inefficiently since too little attention is paid to air movement in a room. Compares effect of inlet and exhaust air devices. Considers reduced ventilation need if pollution can be eliminated or reduced. States that ventilation efficiency is an indication of how efficiently the air is used in the occupation zone and that the air supply to a zone determines ventilation efficiency. Illustrates various forms of ventilation.

Efficiency of ventilation systems. Ventilasjonssystemers effektivitet.

Discusses principle that the position of supply air devices has a considerable influence on the ventilation efficiency that can be achieved. Considers factors affecting ventilation efficiency and different ventilation models. Illustrates different air supply systems.

Air quality in public buildings with health related complaints.

Over 200 reports of health hazard evaluations are available of sealed, air-conditioned buildings, requested by occupants who believe their buildings to be hazardous to their health. Describes a computer based building information system developed to extract relevant information about internal environmental measures, disease characteristics and history of occupants, as well as relevant features of the architecture and ventilation conditions of buildings.

Ventilation efficiency as a guide to design.

The concept of age, or residence time is applicable to characterize both how the supplied air or a contaminant is spread within an enclosed space and how quickly a contaminant is removed. Discusses the application of the concept toany enclosed space with air intakes and extracts. Establishes a direct relationship between the age concept, exposure to contaminants, and equilibrium concentrations. Treats different tracer gas techniques for measuring the age distributions and derived quantities.

Natural ventilation - auxiliary ventilation. Naturliche Luftung - unterstutzende Luftung.

Discusses whether air conditioning could be replaced. Treats the evolving concept of constructing office buildings designed to meet comfort conditions by natural ventilation, with mechanical ventilation, cooling and humidification applied only during the coldest parts of the winter and hottest periods of the summer. Describes the practical application of this concept to three office buildings in West Germany.