Ebullient cooling device
Inactive Publication Date: 2011-11-24
TOYOTA IND CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0025]In accordance with the ebullient cooling device according to the present invention, the occurrence of burnout can be inhibited.
Problems solved by technology
In ebullient cooling devices, there is such a possibility that burnout (or film boiling) might occur with respect to heating elements that give rise to high heat fluxes.
In a region where burnout has occurred, the cooling performance has declined because no heat transfer is carried out.
Recently, however, the more electronic instruments, and the like, are downsized, or the more they are highly integrated, the higher the resultant heat fluxes (or heat-generation densities) become (1 MW / m2 approximately, for instance), and hence burnout becomes likely to occur.
However, water has become inadequate for the installation onto vehicle, because it has such a high melting point that it has frozen readily.
Method used
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Embodiment Construction
[0050]Next, the present invention will be explained in more detail while giving an embodiment mode.
[0051]Explanations will be made on an ebullient cooling device according to the present embodiment mode with reference to FIG. 1 through FIG. 9. FIG. 1 is a schematic perspective diagram that illustrates an ebullient cooling device 1. FIG. 2 is a cross-sectional diagram being viewed in the direction of “A”-“A” in FIG. 1. FIG. 3 is a diagram that shows the characteristics of each of alcohols. FIG. 4 is a diagram that shows a relationship between ethanol concentrations in ethanol-water mixed liquids and limit heat fluxes thereof. FIG. 5 is a diagram that shows a relationship between separation distances and heat transfer coefficients. FIG. 6 is a diagram that shows a relationship between return-separation distances and heat transfer coefficients. FIG. 7 is a diagram that shows a relationship between ethanol concentrations in ethanol-water mixed liquids and heat transfer coefficients ther...
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To provide an ebullient cooling device that can prevent the freezing of liquid cooling medium, and which can inhibit the occurrence of burnout.An ebullient cooling device according to the present invention is characterized in that: it comprises an accommodating unit in which a liquid cooling medium is accommodated, the liquid cooling medium receiving heat that results from a heating element; the liquid cooling medium is a mixed liquid comprising at least two types of liquids whose boiling points differ; the accommodating unit has: a heat-transferring wall portion that conveys the heat of the heating element to the liquid cooling medium; and a facing wall portion that faces the heat-transferring wall portion by way of the liquid cooling medium; and a separation distance between the heat-transferring wall portion and the facing wall portion is 3 mm or less.
Description
TECHNICAL FIELD[0001]The present invention is one which relates to an ebullient cooling device that uses a cooling medium.BACKGROUND ART[0002]An ebullient cooling device is a device for cooling a heating element utilizing the phase change of a cooling medium from liquid to gas. Here, in sealed-system ebullient cooling devices, it is often the case that the liquid cooling media, which receive heat from the heating elements, are alcohols. For example, in Japanese Unexamined Patent Publication (KOKAI) Gazette No. 4-257,693 (or Patent Literature No. 1), there is set forth a mixed liquid of water (100) and a lower alcohol (from 5 to 12). The cooling medium herein is intended for heat pipe that is used to cool indoor instruments mainly, and is made so as not to be freezable at −10° C. approximately, and to be nonflammable.[0003]Moreover, in Japanese Unexamined Utility Model Publication (KOKAI) Gazette No. 62-8,571 (or Patent Literature No. 2), there is set forth a mixed liquid of water an...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F28D15/00
CPCF28D15/0266H01L23/427H01L2924/0002H01L2924/00F28D15/02H05K7/20
Inventor YOSHIHARA, KOJIHARIU, SATOSHI
Owner TOYOTA IND CORP