CONDENSER FAN CONTROL SYSTEM
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United States of America Patent
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Issued Date -
Aug 25, 2011
app pub date -
Oct 13, 2009
filing date -
Oct 24, 2008
priority date (Note) -
Abandoned
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Abstract
A method of controlling a fan for cooling a condenser in an air conditioning system is provided. A compressor serves to drive a refrigerant around a fluid circuit which includes the condenser. The duty cycle of the compressor is measured over a period of time to determine a utilisation ratio which reflects the demand on the air conditioning system at that time. The fan is driven at a speed which is no lower than a minimum fan speed which is associated with the calculated utilisation ratio and ambient temperature. Therefore, the demand on the system is determined and exploited without any additional pressure sensors.
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