Circuit controlling coolant flow to a non-linear heat exchanger

Details Circuit controlling coolant flow to a non-linear heat exchanger Circuit controlling coolant flow to a non-linear heat exchanger

1982-09-13

1983-07-19

Wayner, William E.

Heat exchange

Structural installation

236 78C, 251131, 318615, G05D 1500

Patent

active

043939210

ABSTRACT:
An electronic circuit controls a non-linear electromechanical valve in order that the temperature of approximately 25 gallons of coolant water within a reservoir may be maintained within +2.8.degree. C. to -0.0.degree. C. of a set point temperature from 35.degree. F. to 100.degree. F. The valve regulates circulation of such coolant within a secondary cooling loop incorporating a non-linear heat exchanger for thermal exchange with building water flowing from 20 to 30 gallons per minute. The reservoir coolant water is subject to an essentially instantaneously variable thermal load of 0 to 20 kilowatts due to circulation through logic modules in a primary coolant loop. The electromechanical valve control circuit receives an external set point temperature signal, and a reservoir coolant temperature signal which is offset in conversion from degrees Kelvin to degrees Centigrade. The electromechanical valve control circuit employs a first feedback signal from a position potentiometer mechanically linked to valve position, which signal is compensated in a breakpoint amplifier to account for valve and heat exchanger non-linearities in the secondary cooling loop. A second feedback signal from a tachometer, mechanically linked to a motor driving the valve through a 1000:1 gear reduction, is utilized to impart circuit stability.

REFERENCES:
patent: 2234913 (1941-03-01), Haines
patent: 3391317 (1968-07-01), Bell
patent: 3778025 (1973-12-01), Lane et al.

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