US Patent No. 10,015,912

DATA CENTER WITH LIQUID IMMERSION TANK AND CONTROL METHOD OF THE DATA CENTER BASED ON TEMPERATURE DIFFERENCE


Patent No. 10,015,912
Issue Date July 03, 2018
Title Data Center With Liquid Immersion Tank And Control Method Of The Data Center Based On Temperature Difference
Inventorship Satoshi Inano, Minoh (JP)
Hiroyuki Fukuda, Yokohama (JP)
Hiroyoshi Kodama, Isehara (JP)
Hiroshi Endo, Atsugi (JP)
Yukiko Wakino, Sagamihara (JP)
Assignee FUJITSU LIMITED, Kawasaki (JP)

Claim of US Patent No. 10,015,912

1. A data center comprising:a liquid immersion tank that holds an information processing apparatus in a cooling liquid;
a cooling apparatus connected directly to the liquid immersion tank through a pipe through which the cooling liquid flows from the liquid immersion tank to the cooling apparatus to be cooled;
a pump apparatus provided in the pipe to deliver the cooling liquid from the cooling apparatus to the liquid immersion tank through the pipe; and
a controller configured to control a flow rate of the cooling liquid flowing through the pipe between the liquid immersion tank and the cooling apparatus and an operation rate of the cooling apparatus,
a portion of the pipe that passes through the cooling apparatus is continuous without being disconnected and exposed to outside air and a cooling water such that the cooling liquid flowing through the portion of the pipe is cooled directly by the outside air and by the cooling water in the cooling apparatus while continuously flowing through the portion of the pipe without being disconnected,
the pump apparatus delivers the cooling liquid cooled directly by the outside air and the cooling water in the cooling apparatus to the liquid immersion tank via the pipe such that the cooling liquid is cooled directly by the outside air and by the cooling water while being circulated between the liquid immersion tank and the cooling apparatus through the pipe, and
the controller controls the flow rate of the cooling liquid between the liquid immersion tank and the cooling apparatus based on a temperature difference between a first temperature of the cooling liquid flowing from the liquid immersion tank to the cooling apparatus and a second temperature of the cooling liquid flowing from the cooling apparatus to the liquid immersion tank, and controls the operation rate of the cooling apparatus based on the second temperature of the cooling liquid flowing from the cooling apparatus to the liquid immersion tank such that the second temperature of the cooling liquid from the cooling apparatus is maintained within a predetermined range of a target temperature;
wherein the data center further comprises a first temperature sensor that measures the first temperature and a second temperature sensor that measures the second temperature; and
wherein the controller controls the flow rate such that the temperature difference between the first temperature and the second temperature is equal to or lower than a predetermined temperature.