Improving HVAC With PID and VFDs

Eure, Harvey
December 2008
Heating/Piping/Air Conditioning Engineering;Dec2008, Vol. 80 Issue 12, p44
The article discusses the three functions of control that are effective in improving consistency of heating, ventilating and air-conditioning (HVAC) system in commercial buildings and industrial facilities in the U.S. It views that the uncontrolled changes in both inside, and outside the building could impact efforts to maintain desired temperature. These three controls include proportional, integral and derivative controls which use closed-loop feedback system to maintain temperature.


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