Protection of heat pipes from freeze damage

Details Protection of heat pipes from freeze damage Protection of heat pipes from freeze damage

1985-12-23

1987-05-12

Davis, Jr., Albert W.

Heat exchange

Intermediate fluent heat exchange material receiving and...

Plural intermediate fluent heat exchange materials

1651341, 252 70, 252 71, F28D 1500, F28F 2302

Patent

active

046641815

ABSTRACT:
Disclosed is a heat pipe which is protected from damage due to freezing by the addition of small amount of a liquid such as an alcohol to its working fluid. Ethanol/water mixtures having ethanol concentrations from about 1 to 7.5 percent by volume are found to produce a relatively weak crystal solid during freezing in a heat pipe so that the weak solid breaks up and expands without rupturing a wall or joint of the heat pipe. Heat transfer and operating characteristics of the heat pipe are not degraded due to the presence of specified amounts of the additive.

REFERENCES:
patent: 3079087 (1963-02-01), Herrick et al.
patent: 3777811 (1973-12-01), Shcosinger
patent: 4106554 (1978-08-01), Arcella
Bennett, H., The Chemical Formulary, vol. 2, pp. 480-481, 1935.

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