Abstract
Abstract In this paper a method is given showing how it is possible to present the complete characteristics of fans in a very concise manner. This is usually done by giving pressure-volume curves for different sizes and speeds. Here this relationship for all sizes and speeds is shown by three curves. Theory is developed according to which all data for designing a fan can be determined if the volume per minute and the pressure rise, i.e., the power output of the fan, are given. In addition, it is shown how the efficiency due to air friction can be calculated, and in what way the loss due to the rotational velocity of the air behind the fan is determined by the pressure increase produced by the fan. The limitation of the theory is then dealt with, and various restrictions regarding the validity of the assumptions made are discussed. Finally a short description of a test equipment for fans is given.
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