Abstract
The purpose of the paper is to draw attention to the situation which obtains when fan equipment forms part of the plant used to manufacture a product.
Considerable detail is given in support of the points advanced, which deal mainly with the economics of production and include fan development, rating, design, application and control. Particular attention is devoted to the practical side in order to show how to obtain maximum financial profit from investment in fan equipment.
As the theory of fan characteristics has, mainly, been evident in the literature on the subject, such theory has been avoided, excepting in connexion with the classic argument about the parallel operation of forward-curved bladed fans, concerning which, four premises have been cited in an attempt to inspire a mathematically qualified reader to develop a theory agreeing with observed phenomena—a theory which has not yet been produced.
In the section of the paper dealing with the control of fans, the economic aspect is again stressed, particularly in connexion with the relationship between overall boiler efficiency and the method of controlling boiler house fans, the problem being resolved into terms of control of the carbon dioxide content of the flue gases.
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