Flowrate controller for hybrid capillary/mechanical two-phase th

Details Flowrate controller for hybrid capillary/mechanical two-phase th Flowrate controller for hybrid capillary/mechanical two-phase th

1991-06-05

1992-04-14

Davis, Jr., Albert W.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 13, 165 41, 16510428, 16510426, 2386108, 2386111, 2386112, 73304C, F28D 1502, G05D 700

Patent

active

051038978

ABSTRACT:
A hybrid capillary/mechanical two-phase thermal loop has a sensor connected in parallel with a number of evaporators to regulate the flowrate of a booster pump providing working fluid to the evaporator capillaries. This sensor is made of a coiled, conductive tube connected in parallel with the evaporators, with an inside diameter substantially greater than the inside diameters of the evaporator capillaries. A conductive wire extends within said tube, but is insulated from electrical contact with the tube. The working fluid contained within the tube acts as a dielectric between the tube and wire. The amount of liquid phase working fluid within the tube can be determined by measuring the electrical capacitance between the tube and wire. The flowrate of the booster pump is then regulated as a function of the measured capacitance to maintain a substantially constant amount of liquid phase working fluid within the sensor tube. The sensor thereby effectively regulates the flowrate of working fluid from the pump to match the aggregate demand of the evaporators.

REFERENCES:
patent: 2910940 (1959-11-01), Colman et al.
patent: 3866424 (1975-02-01), Busey
patent: 4352392 (1982-10-01), Eastman
patent: 4389900 (1983-06-01), Gutierrez
patent: 4470450 (1984-09-01), Bizzell et al.
patent: 4492266 (1985-01-01), Bizzell et al.
patent: 4603732 (1986-08-01), Niggemann
patent: 4664177 (1987-05-01), Edelstein
AIAA-86-1246, Thermostatic Control of Two-Phase Spacecraft Thermal Management Systems, by B. A. Cullimore and R. C. Epper, 1986.

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