Heat exchange – With retainer for removable article – Electrical component
Patent
1996-06-13
1997-09-30
Rivell, John
Heat exchange
With retainer for removable article
Electrical component
16510433, 361695, 361724, 257721, F28F 700
Patent
active
056718055
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and a unit for cooling devices that are installed in a closed space, for instance telecommunications equipment.
DESCRIPTION OF THE BACKGROUND ART
It is known that the principle of natural convection can be applied to cool vertical surfaces by heating a cold medium to a lower density, wherewith underlying cold medium of higher density will force away the heated medium, causing it to rise. It is also known to distribute air by applying so-called air displacement flow principles. This type of flow functions in accordance with principles that are similar to the principle of natural convection, namely that cold air is heavier than warm air and will therefore take the lowest possible level. When the cold air is released immediately above a floor surface, the cold air will fall down onto the floor and force away air of higher temperature. It is usual to say that the cold air "runs out over the floor". One condition in this respect is that the air speed is low enough not to generate turbulence. Turbulence would cause the cold air to mix with ambient air and the resultant air flow would no longer be a displacing air flow.
SUMMARY OF THE INVENTION
With the intention of cooling telecommunications equipment in rack cabinets installed in closed spaces in an energy-saving manner with high operational reliability and little need of maintenance and with few movable parts, there has been developed a method and a unit for cooling telecommunications equipment installed in rack cabinets placed in closed spaces. The two principles earlier mentioned have been combined and have been applied in apparatus rooms in which cooling of equipment installed therein is necessary. When cooling and heating air, the amount of thermal energy that can be transported via the air per unit of time is determined primarily by two parameters, vis
When the same amount of thermal energy is to be transported per unit of time, these two parameters are the reverse: A large amount of air per unit of time is equivalent to a low difference in air temperature; a high temperature difference requires less air per unit of time. The combination of displacement air distribution (distribution of cold air) and natural convection generated when the air is heated and therewith cooling heat-emitting objects is referred to here as displacement cooling.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a space in which cooling units and cooling equipment according to the invention are installed.
FIG. 2a illustrates the movement pattern of supply air in front of a rack cabinet.
FIG. 2b illustrates the passage of supply air through the rack, as seen from one side thereof.
FIG. 3 shows the layering of warm and cold air in front of and above the cabinet.
DETAILED DESCRIPTION
FIG. 1 shows schematically a cooling unit 1 and equipment 2 to be cooled placed in a space or room 3. The room is assumed to be airtight. The cooling unit 1 is constructed to take in warm air at ceiling level, to cool the air and then to discharge the cooled air at a low speed at floor level. The front surface of the air outlet 4 is large, so as to obtain a low air speed. Return air heated in the room is drawn by suction into a unit intake 5 which is located as close as possible to the ceiling, and is cooled in the unit and returned to the room through the outlet 4, which is located as close to the floor as possible. The cold supply air is distributed at a low speed, i.e. the air disperses into the room to the vicinity of the cabinet in which the heat-generating components to be cooled are located. Cold supply air is now present in front of the cabinet and extends up from the floor to a level immediately beneath the uppermost point of the cabinet.
The air will pass along different routes as it is heated, these routes depending on the construction of the cabinet and the equipment housed therein. A common feature, however, is that cold supply air is drawn by suction into the interior of the cabinet and therewith cools the heat-gener
REFERENCES:
patent: 4535386 (1985-08-01), Frey, Jr. et al.
patent: 4758925 (1988-07-01), Obata et al.
patent: 4901138 (1990-02-01), Kushibiki et al.
patent: 5419679 (1995-05-01), Gaunt et al.
patent: 5477417 (1995-12-01), Ohmori et al.
Karstrom Anders
St.ang.hl Lennart
Atkinson Christopher
Rivell John
Telefonaktiebolaget LM Ericsson
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