The fan comprising a device for the determination of the flow by weight or volume of the fluid, 2004

摘要

Fan for a compressible fluid, comprising a device for determining the mass flow or in a plane of the calibration, comprising a body and a wheel mounted movable in rotation in the body, at least one location of the pressure being provided on the suction and delivery side in the body, the location at which, in view of the determination of the pressure difference δ p1, 2 on the wheel, is connected at least one pressure sensor which is in turn connected to an electronic control unit to which are moreover bring a speed signal n representing the speed of the wheel, a signal of the pressure pk, representing the static pressure in the plane of the calibration, as well as a signal of the temperature tk, representing the actual temperature of the fluid in the plane of calibrage.l' control unit comprises a memory of a constant and a memory of product characteristics, in which are stored the constant gas r, the fluid to be conveyed, and the characteristic of the fan is reduced to the calibration conditions, at a predetermined speed nca1 of the wheel and to a predetermined temperature tca1 in the plane of the calibration, and a processor which determines the enthalpy of the formula (see appended drawing in bopi) and, on the basis of the memory of product characteristics, the volume flow rate vred, cal, associated with the value determined for his, red, cal, and hence the volume flow rate according to the formula (see appended drawing in bopi)