US 4,729,424 AGranted

Cooling system for electronic equipment

AssigneeNEC Corporation

InventorsTsukasa Mizuno, Minoru Okano

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Abstract

A cooling system for maintaining the temperature within electronic equipment has a circulation system for pumping a cooling liquid, such as water, through the electronic equipment where it picks up heat generated by the electronic equipment. The cooling liquid is pumped through a plurality of heat exchangers using a refrigerant which is, in turn, pumped through a compressor-condensor combination, each heat exchanger having approximately the same cooling capacity. A central control selects the number of heat exchangers which are to operate at any given time, on a basis of the differential in the temperature of the water being pumped into and out of the electronic equipment. This maintains a desired and relatively wide range of temperatures. A heating element selectively and controllably heats the cooled water to bring the wide range of temperatures to a selected and fixed temperature.

Claims9

Dependent claims

A cooling system for controlling the temperature of electronic equipment, said cooling system comprising a circulation system for conveying a cooling liquid into, through and out of said equipment, said cooling liquid being heated by heat of said equipment while it flows through said equipment;

a plurality of heat exchangers for removing heat from said cooling liquid after it leaves said equipment, each of said heat exchangers having a capacity for removing a predetermined amount of heat from said cooling liquid;
control means responsive to a differential of temperatures of the cooling liquids flowing into and out of said equipment for operating a selected number of said heat exchangers which is required to maintain a relatively wide range of temperatures within said equipment;
means in said circulating system for heating the cooling liquid before it enters into said equipment;
and said control means being further responsive to temperature sensing means within said equipment for controlling said heating means to maintain the temperature of the liquid coolant to be fed to said electronic system equal to or higher than the temperature within said electronic system.

1 more element

A cooling system for cooling an electronic system comprising:

supply means for supplying a liquid coolant to said electronic system to take heat from the system;
discharge means for discharging from said electronic system said liquid coolant which has been heated with said heat;
first temperature sensing means for detecting the temperature of said liquid coolant before it is supplied to said supply means;
second temperature sensing means for detecting the temperature of said liquid coolant discharged from said discharge means;
third temperature sensing means for detecting the temperature within said electronic system;
a plurality of heat exchange units for cooling said liquid coolant discharged from said discharge means;
an expansion tank having heating means for heating said liquid coolant supplied from said heat exchange units;
first control means responsive to the difference between the temperature detected by said first temperature sensing means and the temperature detected by said second temperature sensing means for determining the number of said plurality of heat exchange units which is to be operated and for controlling their operations;
and
second control means for controlling said heating means in response to the temperature difference between the temperature detected by said first temperature sensing means and the temperature detected by said third temperature sensing means so as to keep the temperature of said liquid coolant to be fed to said electronic system equal to or higher than the temperature within said electronic system.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/052,174Filed 30 Apr 1987 · continuation in part
Priority: JP 60-50927[U]5 Apr 1985
Granted: 8 Mar 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H05K 7/20281
Using a liquid coolant without phase change in electronic enclosures: thermal management, e.g. liquid flow control
F25D 17/02
Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces: for circulating liquids, e.g.…
G06F 1/20
Constructional details or arrangements: cooling means
H05K 7/20381
Using a liquid coolant with phase change in electronic enclosures: thermal management, e.g. evaporation control