System and method for improving the thermal efficiency of a heating system
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United States of America Patent
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Jun 29, 2010
Grant Date -
May 3, 2007
app pub date -
Oct 17, 2005
filing date -
Oct 17, 2005
priority date (Note) -
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Abstract
A system and method for providing a heating system with good thermal efficiency by adjusting combustion air flow in response to fuel-input rate changes over a wide range. An AC motor operates in a slip mode whereby as the fuel-input rate changes, the combustion air density is affected. In response, changes in the load and thus the speed of the motor occur. Consequently, the quantity of combustion air flow increases in response to a fuel-input rate increase. The motor switches to a synchronous speed in response to the fuel-input rate reaching a set value, e.g., 70 percent of maximum rate.
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