Invention Grant
US09200995B2 Method and apparatus for monitoring air filter condition 有权
监测空气过滤器状况的方法和装置

Method and apparatus for monitoring air filter condition
Abstract:
A method and apparatus are disclosed for monitoring accumulation of dirt on an air filter of a ventilation system including the filter and a fan controlled by a frequency converter. An initial value for an operating parameter is determined. A present operating point is determined based on a characteristic curves, and the mechanical power and rotational speed of the fan. A present value for the operating parameter is determined based on the present operating point, and accumulation of dirt is determined on the air filter based on the initial and present values of the operating parameter.
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