Heat exchange – Intermediate fluent heat exchange material receiving and... – Liquid fluent heat exchange material
Reexamination Certificate
1998-08-27
2001-01-09
Lazarus, Ira S. (Department: 3743)
Heat exchange
Intermediate fluent heat exchange material receiving and...
Liquid fluent heat exchange material
C165S122000, C165S104340, C361S310000
Reexamination Certificate
active
06170562
ABSTRACT:
The invention relates to a device for the exchange of thermal energy between the interior of a housing, more particularly for a telecommunication apparatus and an environment according to the preamble of the claim
1
.
BACKGROUND OF THE INVENTION
The housing of an electrical apparatus, by way of example a transmission cabinet with radio equipment contained therein for a mobile telephone system, does in particular comprise electric components which generate waste heat. In order to avoid an overheating of the electric equipment, this waste heat has to be eliminated.
Since such housings normally are air-tight or hermetically sealed containers, the employment of a simple waste heat extractor fan is not possible.
That is why it is the technical problem of the present invention to provide a device of the type stated above, which conveys heat from a housing interior to the outside and maintains the internal temperature for the components involved within tolerated limits.
This technical problem is resolved by a device of the above-mentioned type possessing the features characterized in claim
1
.
SUMMARY OF THE INVENTION
For this purpose, in the air—air heat exchanger according to the invention, a heat exchanger block is provided with at least two fluid duct systems that are separated from each other and which are in thermal energy-transmitting contact with each other, in which case a first fluid duct system communicates with the interior of the housing and a second fluid duct system communicates with the environment and wherein, to each fluid duct system, at least one fluid pump each is allocated for the conveyance of a first working fluid in the first fluid duct system and of a second working fluid in the second fluid duct system.
This has the advantage that the heat is eliminated in an indirect manner, thus without the removal of fluid from the housing interior and without an intermingling of fluid in the housing interior, i.e. the first working fluid and the second working fluid, taking place. That is why the device according to the invention can be employed especially with insulated, airtight or hermetically sealed housings.
Further developments of the device are preferably described in the subclaims.
A particularly simple, effective and maintenance-friendly arrangement is achieved in that the heat exchanger block is mounted externally on the housing and in that pertinant apertures for the inflow of fluid and the outflow of fluid are provided between the housing interior and the first fluid duct system.
Expediently, the first and/or the second working fluid is air and, by preference, the fluid pumps are fans, in particular radial fans, axial fans or tangential fans.
In a specially preferred embodiment, which permits a particularly good heat exchange to be effected between the interior of the housing, the heat exchanger block comprises a cross reverse flow plate exchanger or counter-current plate exchanger.
In order to reduce weight and so as to enhance the corrosion resistance, the heat exchanger is preferably manufactured from aluminum and/or plastic, more particularly polypropylene (PP).
In order to ensure a predetermined temperature in the in-interior of the housing or in the first fluid duct, a controller is provided in the interior of the housing, which controls the speed of at least one fan. This controller possesses, in a specially preferred manner, a malfunction reporting output.
Expediently, the housing is airtight, more especially, hermetically sealed in relation to the environment.
In order to avoid the falling below a dew point of at least one working fluid, in a specially preferred embodiment, provision is made for a heating means, particularly a resistance heating element.
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patent: 4449579 (1984-05-01), Miyazaki et al.
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patent: 4949218 (1990-08-01), Blanchard et al.
patent: 5035281 (1991-07-01), Neuenfeldt et al.
patent: 5054545 (1991-10-01), Ghaemian
patent: 5203178 (1993-04-01), Shyu
patent: 5287244 (1994-02-01), Hileman et al.
patent: 5333676 (1994-08-01), Mizuno
Friedrich Kueffner
Lazarus Ira S.
McKinnon Terrell
Otto Pfannenberg Elektro-Spezial-Geratebau GmbH
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