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natural draft |
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natural draft [′nach·rəl ′draft] (fluid mechanics) Unforced gas flow through a chimney or vertical duct, directly related to chimney height and the temperature difference between the ascending gases and the atmosphere, and not dependent upon the use of fans or other mechanical devices. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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For example, cupolas and roof lanterns allowed hot air to rise and provided a natural draft to pull air through buildings. If the boiler is natural draft, excess air could cool down the heating surface, keeping fuel from combusting properly. Foster Wheeler's Terrace-Wall[TM] reformer features a unique firing arrangement within a sloped-wall radiant section, enabling long catalyst and catalyst tube life, and can be designed for natural draft operation, providing additional operational, reliability and cost benefits. |
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