Variable thermal impedance

Details Variable thermal impedance Variable thermal impedance

1981-04-16

1983-01-25

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219494, 219312, 165 32, 16510426, 16510424, H05B 102

Patent

active

043705472

ABSTRACT:
The invention is a method for controlling the temperature of a primary heat-generating source in an environment whose temperature may vary widely. A heat-pipe is used to carry the heat from the source to a sink at ambient temperature. A separate control source applies heat to the heat pipe. The condensed liquid returning in the heat pipe is partly evaporated by the control heat, whereby the flow of liquid available for evaporation by the primary heat source is reduced and the heat conducted away from the source by the pipe is consequently reduced. The control source heat is regulated by a servo circuit to maintain the temperature of the primary source. The efficiency is higher than prior-art controllers using a constant thermal impedance between source and sink.

REFERENCES:
patent: 3517730 (1970-06-01), Wyatt
patent: 3526272 (1970-09-01), Watts et al.
patent: 3924674 (1975-12-01), Basiulis
patent: 3934643 (1976-01-01), Laing
patent: 4067237 (1978-01-01), Arcella
patent: 4078149 (1978-03-01), Whirlow et al.
"The Heat Pipe" 2-1967, Mechanical Engineering by Feldman, Jr. et al.

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