Heat transfer device
AssigneeHitachi, Ltd.
InventorsToshitsugu Hara, Motokazu Uchida, Yasushige Kashiwabara, Michio Yanadori
Life of this patent
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Abstract
A heat transfer device comprises two kinds of liquid having different boiling points and specific gravities, said two kinds of liquid being not mutually dissolvable and charged in a vessel so as to form two layers therein in superimposed relation to each other. In the heat transfer device, a large amount of heat is transferred at temperatures above a certain temperature but unidirectionally, while no heat transfer is effected at temperatures below the aforesaid certain temperature. The heat transfer device is suited for use in such apparatus or machines which require a thermally valving function, especially for use in a refrigerator.
Claims11
In a heat transfer device, the improvements comprising;
- a vessel having a heating section and a cooling section;
- a thermal transfer medium for transferring heat from said heating section to said cooling section;
- and a liquid body having a specific gravity smaller than said thermal transfer medium and being low in vapor pressure at a temperature corresponding to the boiling point of said thermal transfer medium, said liquid being not dissolvable in said thermal transfer medium;
- said thermal transfer medium and said liquid being charged in said vessel under an adequate pressure which is determined in accordance with an operating temperature of the device and a saturated vapor pressure of said thermal transfer medium, thereby forming two layers therein, a level of said liquid forming an upper layer of said two layers is maintained without being salient into said cooling section.
In a heat transfer device, the improvements comprising;
- a vessel consisting of a heating section and a cooling section;
- a thermal transfer medium for transferring heat from said heating section to said cooling section;
- and a liquid body having a specific gravity smaller than said thermal transfer medium and being low in vapor pressure at a temperature of boiling point of said thermal transfer medium, said liquid having property of non-admixing with said thermal transfer medium;
- said thermal transfer medium and said liquid being charged in said vessel under an adequate pressure which is determined in accordance with an operating temperature of the device and a saturated vapor pressure of said thermal transfer medium, thereby forming two layers therein, and two layers having a liquid surface a level of which is maintained without being salient into the cooling section, said thermal transfer medium producing boiling bubbles when heat is applied to said heating section, said boiling bubbles passing through the upwardly located liquid layer without being condensed due to a direct heat exchange, entering said cooling section and then being condensed therein, whereby heat is transferred from said heating section to said cooling section.
In a heat transfer device, the improvement comprising:
- a vessel having a heating section and a cooling section;
- a thermal transfer medium for transferring heat from said heating section to said cooling section;
- and a liquid body having a specific gravity smaller than said thermal transfer medium and being low in vapor pressure at a temperature corresponding to the boiling point of said thermal transfer medium, said liquid being not dissolvable in said thermal transfer medium;
- said thermal transfer medium and said liquid being charged in said vessel under an adequate pressure which is determined in accordance with an operating temperature of the device and a saturated vapor pressure of said thermal transfer medium, thereby forming two layers therein, a level of said liquid forming an upper layer of said two layers is maintained without being salient into said cooling section wherein heat transfer is effected by ebullition and condensation of said thermal transfer medium in which the medium condensed in said cooling section circulates by gravity into said heating section in which ebullition thereof takes place.
Dependencies are inferred from the claim text.