Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1979-10-11
1983-06-21
Scott, Samuel
Heat exchange
Movable heating or cooling surface
Rotary drum
165 35, 165 97, 165103, 16510431, 417373, G05D 2300
Patent
active
043889646
ABSTRACT:
In a space shuttle, payloads are individually temperature controlled by means of a liquid control loop in heat exchange relationship with both the payload and a radiator or shuttle cold plate. The liquid pump is driven at a variable speed to control the heat transferred between the load and the radiator or cold plate, and the motor may be reversed to by-pass the radiator through check valves. The radiator includes heat pipes seated in elongated, high thermal conductivity extrusions and retained therein by elongated springs. The motor is a brushless DC motor isolated from the pump by a magnetic clutch and thermal isolator. The motor is driven by a digital circuit which provides a single pulse to each set of windings during each energizing time frame. The width of that pulse is modulated to provide for speed control. Pulse width modulation is by means of a one-shot, the pulse duration of which is controlled by a speed control signal.
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Proceedings of Spacecraft Thermal and Environmental Control Systems Symposium, Almgren et al, Munich, Oct. 10-12, 1979 (ESASP-139, Nov. 1978).
"Radiator Heat Rejection Options for Shuttle Payloads", ASME publication 79-ENAs-18.
DC Motors Speed Controls Servo Systems, Electro-Craft Corporation, pp. 3-20 and 3-27.
Almgren David W.
Bartoszek John T.
Berthiaume Richard P.
Lucas Robert M.
Saia William H.
Arthur D. Little Inc.
Focarino Margaret A.
Scott Samuel
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