Flow velocity measurement method and apparatus, including applications thereof for measuring heat flow, and wind velocity and/or direction generation
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United States of America Patent
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May 2, 2006
Grant Date -
Nov 25, 2004
app pub date -
May 13, 2004
filing date -
May 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for measuring the flow velocity of a flowing fluid includes a positive temperature coefficient thermistor to be immersing within the flowing fluid in order to provide a measurement of the rate of heat dissipation of the thermistor produced by the flowing fluid, and thereby a measurement the flow velocity of the fluid. The positive temperature coefficient thermistor used has a resistance which increases sharply at the predetermined temperature at which electrical current is maintained in the thermistor such that the thermistor is self-controlled to maintain substantially the predetermined temperature, whereby the electrical current drawn by the thermistor is a measurement of the thermal load on the thermistor resulting from the thermal heat dissipation therefrom by the flowing fluid, and thereby a measurement of the flow velocity of the fluid. Various embodiments of the invention are described, including those for measuring heat flow in a centralized heating or air conditioning system, wind velocity and direction, and flow velocity in a wind tunnel.
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