A large number of multifamily buildings have mechanical exhaust air ventilation. The control of such systems' function is often inadequate and adjustment is rarely carried out. One reason for this is the lack of simple methods for determining system performance and air change rates. The report describes a simple method and simple equipment for determining performance in terms of an installation's capacity curve or 'fan installation' curve. Defines terminology and measurement principle. Illustrates equipment and arrangement for measurements.
Measurements on the rate of air exchange in residential buildings have been carried out by the Swedish Institute for Building Research since 1970. The results of an analysis of these measurements are presented in this paper for about 500 buildings not having mechanical ventilation. The studied buildings include one- and two-storey, detached, single- family houses, row houses, and multifamily residential buildings built between 1900 and 1982 and of various design. In some cases, the buildings have been retrofitted by improving the insulation of the attic or the exterior walls.
Factsheet discusses types of air-to-air heat exchangers, their advantages and disadvantages, installation details, and how to select an air-to-air heat exchanger that is appropriate. Sections include how an air-to-air heat exchanger works, materials used for partitions, installation, condensation and frost removal, controls, maintenance, selecting a heat exchanger, and how much energy will be saved.
Ventilation by displacement is described in terms of ventilation efficiency and quantified by means of a two-zone flow and diffusion model. The practical procedure is by means of adequate diffusers firstly, to 'hit' the persons with the ventilation air and secondly, to displace both air and contaminants out of the zone of occupation and avoid recirculation. This procedure has a firmbasis in the research work on ventilation efficiency that is carried out inNorway and Sweden during the last years as well as in current theory practice.
The report of the investigation into the possibilities for saving energy by closing (large) windows in good time after, for example, the so-called 'airing' of bedrooms, initiated by the Netherlands Ministry of Housing and Environment's Steeri
Experimental methods have been developed to determine rates of air renewal. Based essentially on the use of a tracer gas, these methods permit the determination of real values on the site of the building itself. The pressurisation method which e
Air management in residential or tertiary usage buildings constitutes one of the key points of energy control in buildings. The principle themes concerning air management are heating or air conditioning, and ventilation and air renewal, mechani
A benchmark study by Geomet Technologies, Inc, is developing data on the air quality effects of weatherizing a home. One effort under this study has bee nhas been an experiment carefully designed to quantify the relationships between the thr
Ventilation and infiltration rates were measured in eight office buildings using an automated tracer-gas measurement system. The buildings range in size from a two-story building with a floor area of about 2000 m2 to a 15-story office building.
Describes how multizone tracer gas analysis techniques can provide a complete description of office ventilation. Treats the concept of ventilation effectiveness to characterise internal air distribution. Discusses the measurement of whole building ventilation rates and ventilation effectiveness in mechanically ventilated office buildings.
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