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mechanical ventilation

Ventilation of buildings. Luftung von Gebauden

Lists the factors in a building (condensation, comfort, heat loss etc) which are affected by ventilation, mechanical or natural. Treats the driving forces of air exchange in buildings. Describes the four basic flow phenomena involved in air e

Ventilation:British Guides

The ventilation recommendations set out by the British Standards Institute Code of Practice, the Building Research Station Advisory Papers, and CIBS are outlined.

How ventilation influences energy consumption and indoor air quality.

Until recently, natural ventilation was adequate for the indoor air environment of buildings. Today, with added insulation and tighter building envelope standards, indoor air quality is more dependent on mechanical means. The conventional and new control strategies for indoor environments are reviewed, and the point is made that good indoor air quality is attainable with cost effective means if the proper constraints are maintained. To improve control strategies, several suggestions are made:< 1.

Single-family house ventilation - Supply Exhaust System system improved, air heating on its way. Smahusventilation - FTX systemen forbattras, luftburen varme pa vag.

Notes that as houses become tighter, adventitious ventilation decreases. Discusses attitudes to varying degrees of tightness. Explains introduction of the supply exhaust system which comprises air supply, air exhaust and heat recovery. Notes requirements for economic use of the system and relates installation costs to potential savings. Tabulates systems currently available in Sweden(December 1980)noting maximum air flow, position of heat exchanger and other factors.

The effects of energy efficient ventilation rates on indoor air quality at a California High School.

Reports measurements of indoor air quality in an air conditioned California High School over a range of ventilation rates, ranging from 13.3 cu.ft. of outside air per minute for each classroom occupant to approximately 1.5 cfm per occupant. Parameters measured include outside air supply rate, theoccupants' perception of indoor air quality, microbial burden, concentration of CO2, CO, NOx, SO2, O3 in two classrooms, a hall and outdoors.

Experimental study on the efficiency of mechanical ventilation in inhabited spaces. Etude experimentale sur l'efficacite de la ventilation mecanique controlee dans un local d'habitation.

Ventilation efficiency involves two aspects, to preserve thermal comfort, draughts should be avoided and yet one tries to obtain the best "sweeping out" which corresponds with a maximum exhaust of contaminants from the occupied zone for a given flow rate.< Reports study of 75 tests of ventilation efficiency made in a climatic roomrepresenting a heated living room. Thermal comfort was tested by measuring the air velocity both in the ventilation jet and in the occupied zone.

The reduction of ventilation heat loss by porosity.

By observing animal housing in severely cold conditions it was realised that an airtight building with mechanical ventilation did not provide the optimum solution, but better results were obtained from porous buildings. Reports aninvestigation made on a large model building simulating the humidity and temperature conditions in animal housing during winter. The model had a porous ceiling of flax straw.

Natural and mechanical ventilation rates in a detached house : measurements.

Presents results of measurements of ventilation rates in the SEGAS test house. Describes the house and its heating and mechanical ventilation systems. Measurements of ventilation rates were made using helium as a tracer gas. Tests were made both with the house sealed to block obvious paths of infiltration and with it unsealed. Tests were also made with the house mechanically ventilated and with supply and extract systems working. Presents results of tests and examines the effect of variation in mean wind speed on ventilation rates.

Energy savings: Measurements in an office building stage 1. Energisparingar: Matningar i kontorsbyggnad Etapp 1.

An energy saving survey was carried out in an office building in Stockholm during the autumn of 1978. The measures which were proposed are now being carried out. This report details the measurements made which include, airtightness testing of the building, pressure drops across facades, air flow measurements, temperature measurements in ventilation systems, temperature measurements in rooms, boiler combustion efficiencies, electricity consumption, oil consumption and thermographic inspection.

Mechanical ventilation or natural draft. Painovoimainen vai koneellinen ilmanvaihto.

A fair comparison of ventilation systems is almost an impossible achievement. Even an economic comparison causes difficulties; the different systems render different room air qualities which cannot be counted in money. 

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