Woods Practical Guide to Fan Engineering by B B Daly , BSc, CEng, MIEE, FIHVE

By B B Daly , BSc, CEng, MIEE, FIHVE

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Cool air which continues the process. This is natural convection. Even the slightest air movement around the body will increase the rate at which warm air is replaced by cool, and thus increase the heat loss. The laws governing this heat exchange by forced convection are dealt with in Chapter 12. If the air temperature is on the high side the extra movement will be felt as a pleasant breeze, and can be increased with advantage by the use of ceiling fans or circulating fans. 25m/s-for maximum comfort.

72m3/s fresh air supply. Air distribution and circulation 33 In summer the damper is closed against recirculation and the whole supply allowed to escape, either through the outlet of the extract duct or through open windows. 1 Jet controlled circulation While comparatively crude provisions suffice for high-volume general ventilation systems in industrial buildings, greater sophistication is needed for optimum comfort in a leisure assembly area. The points of air supply are critical, both in their location and in the manner in which the air is introduced.

Genera/ ventilation 17 These rates should be increased by a third if smoking is permitted or if there are doubts about standards of personal hygiene. If minimum legal requirements are specified, they are generally about a third less. In contrast, as little as a 1 litre/s will suffice to meet the strictly physiological needs of one person for oxygen supply and carbon dioxide limitation. 3 Recirculation The flow rates just quoted on a per person basis must be supplied as fresh outside air. So must the air extracted to remove pollution, moisture or heat.

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