Method for determining the operating level of a fan and fan
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Jun 22, 1998
filing date -
Jun 23, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fore many applications it is desirable to determine the operating level, i.e. the current flow rate V and the total pressure difference .DELTA.p.sub.t of a fan in the installed state without external measuring points and calibration. The invention should develop a suitable method and a corresponding fan. In the method of the invention, from a measured effective pressure difference .DELTA.p.sup.M.sub.w a flow rate V is determined and from that, via an operational characteristic curve a target value for the total pressure difference .DELTA.p.sup.s.sub.t is found. By comparing the target value .DELTA.p.sup.s.sub.t determined this way with its measured value .DELTA.p.sup.M.sub.t the operating level and its accuracy are determined. For this purpose on the fan of the invention measuring points are provided for measuring one or more effective pressure differences .DELTA.p.sup.M.sub.w and the total pressure difference .DELTA.p.sup.M.sub.t.
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