Automated Cooling Air Supply
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
A system is provided which allows maintenance of air flow at a high degree of accuracy while the control system is operated in a realtime feedback loop integrated with computer program supervision. As shown in Fig. 1, the air supply comprises a motor-driven blower, a pressure gauge and a flowmeter. The fan blower is operable manually or under computer control. It is necessary to measure five distinct pressures in order to accurately calculate and set the air flow. The fan motor speed is controlled in part using a six-step AC inverter drive in conjunction with a computer-controlled butterfly valve mounted on the blower discharge. The AC inverter allows motor speed control from six Hz to 60 Hz. The butterfly valve may be closed or varied to achieve air flows from 0 to 100%.