US Patent No. 10,925,190

LEAK DETECTION AND RESPONSE SYSTEM FOR LIQUID COOLING OF ELECTRONIC RACKS OF A DATA CENTER


Patent No. 10,925,190
Issue Date February 16, 2021
Title Leak Detection And Response System For Liquid Cooling Of Electronic Racks Of A Data Center
Inventorship Tianyi Gao, Sunnyvale, CA (US)
Assignee BAIDU USA LLC, Sunnyvale, CA (US)

Claim of US Patent No. 10,925,190

1. An electronic rack, comprising:a rack manifold having a rack liquid supply line to receive cooling liquid from a cooling liquid source and a rack liquid return line to return warmer liquid back to the cooling liquid source;
a plurality of server blades arranged in a stack, wherein each server blade of the plurality of server blades includes one or more cold plates associated with one or more information technology (IT) components and a server liquid distribution loop to receive the cooling liquid from the rack manifold and to distribute the cooling liquid to the cold plates to exchange heat generated from the IT components, transforming the cooling liquid into the warmer liquid, wherein each server blade of the plurality of server blades further includes a leak detector configured to detect leaking of the cooling liquid distributed to a corresponding server blade of the plurality of server blades;
a plurality of pairs of server liquid supply lines and server liquid return lines, each pair corresponding to one server blade of the plurality of server blades, wherein the server liquid supply lines and the server liquid return lines are coupled between the rack manifold and the server liquid distribution loops of each server blade of the plurality of server blades;
a plurality of server flow control devices (FCDs), each corresponding to one of the pairs of server liquid supply lines and the server liquid return lines, including a first server FCD coupled to a first pair of a first server liquid supply line and a first server liquid return line of a first server blade, each server FCD of the plurality of server FCDs being disposed on a corresponding server liquid supply line and a corresponding server liquid return line, the each server FCD being a three-way valve having a first position and a second position, wherein the each server FCD is configured to divert the cooling liquid from the corresponding server liquid supply line to the corresponding server liquid return line, bypassing only a corresponding liquid distribution loop of the corresponding server blade of the plurality of server blades;
a rack management controller (RMC) unit coupled to the server FCDs and leak detectors of the plurality of server blades, wherein in response to a signal received from a first leak detector of the first server blade indicating liquid leak within the first server blade, the RMC is configured to transmit a control signal to the first server FCD to reduce an amount of the cooling liquid distributed to the first server blade, wherein the first server FCD is configured to block substantially all cooling liquid to be distributed to a first liquid distribution loop of the first server blade, and wherein the first server FCD is configured to divert the cooling liquid from the first server liquid supply line to the first server liquid return line, bypassing the first liquid distribution loop of the first server blade; and
a coolant distribution unit (CDU) including a heat exchanger being provided in the electronic rack, wherein the heat exchanger includes a first loop and a second loop, the first loop having a first pair of liquid connectors coupled to an external liquid supply line and an external liquid return line to form the first loop, the second loop having a second pair of liquid connectors coupled to each of the plurality of server FCDs to form the second loop.