Patent ID: 6918307
Filing Date: 2005-07-19
Classification: F04D,G01F

Abstract:
1. A device for on-line monitoring of flow quantities in a system comprising a flow-creating device such as a pump or a fan, comprising: means for obtaining a measure of a torque of said flow-creating device; means for obtaining a measure of a rotational speed of said flow-creating device; and means for determining a value of a flow rate through said flow-creating device, means for calculating a value of a mechanical input power of said flow-creating device, connected to said means for obtaining a measure of a torque and said means for obtaining a measure of a rotational speed; storage means for storage of data representing a predetermined relation between mechanical input power and flow rate through said flow-creating device; and whereby said means for determining a value of a flow rate is connected to said means for calculating a value of a mechanical input power and to said storage means; said means for obtaining a measure of a rotational speed in turn comprising: