EP-4741995-A1 - LIQUID IMMERSION COOLING DEVICE AND CONTROL METHOD THEREFOR

EP4741995A1EP 4741995 A1EP4741995 A1EP 4741995A1EP-4741995-A1

Abstract

Provided is a liquid immersion cooling device capable of dealing with equipment troubles in a cooling system of cooling liquid. A liquid immersion cooling device (1) includes: radiators (11) that cool cooling water by exchanging heat with outside air; CDUs (7) where the cooling water cooled by the radiators (11) is introduced and exchanges heat with cooling liquid; a cooling water circulation system in which the cooling water is circuited between the radiators (11) and the CDUs (7); liquid immersion containers (5) into which the cooling liquid cooled by the CDUs (7) are introduced and which retain therein cooling liquid for immersing and cooling electronic equipment; and a cooling liquid circulation system (9) in which cooling liquid is circulated between the CDUs (7) and the liquid immersion containers (5). The radiators (11), the CDUs (7), the cooling water circulation system, the liquid immersion containers (5), and the cooling liquid circulation system (9) are provided in a plurality of parallel arrangements.

Inventors

INOUE, NAOKI
KAJITANI, FUMITO
MATSUDA, NAOHIKO

Assignees

Mitsubishi Heavy Industries, Ltd.

Dates

Publication Date: 20260513
Application Date: 20240129

Claims (10)

A liquid immersion cooling device comprising: a radiator that cools cooling water by exchanging heat with outside air; a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid; a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger; a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored; and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container, wherein a plurality of the radiators, and/or a plurality of the liquid immersion heat exchangers, and/or a plurality of the cooling water circulation systems, and/or a plurality of the liquid immersion containers, and/or a plurality of the cooling liquid circulation systems are provided in parallel.
The liquid immersion cooling device according to Claim 1, wherein the plurality of liquid immersion heat exchangers are provided in parallel, the cooling water circulation system includes a branch header portion having a switching valve that switches a flow to a cooling water pipe branched to each of the plurality of liquid immersion heat exchangers, and the branch header portion is integrated in a predetermined region.
The liquid immersion cooling device according to Claim 1, wherein the plurality of liquid immersion heat exchangers are provided in parallel, and the liquid immersion cooling device further comprises a control unit that controls the number of the liquid immersion heat exchangers to be simultaneously used..
The liquid immersion cooling device according to Claim 1, further comprising: wherein the plurality of radiators are provided in parallel, and the liquid immersion cooling device further comprises a control unit that controls the number of the radiators to be simultaneously used.
The liquid immersion cooling device according to Claim 1, wherein a cooling water pump provided in the cooling water circulation system and/or a cooling liquid pump provided in the cooling liquid circulation system has a variable flow rate.
A liquid immersion cooling device comprising: a radiator that cools cooling water by exchanging heat with outside air; a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid; a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger; a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored; and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container, wherein a plurality of the radiators and a plurality of the liquid immersion heat exchangers are provided in parallel, and the liquid immersion cooling device further comprises a control unit that has a control map in which the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used are represented on a map when an outside air temperature is set as a first axis and a calorific value of the electronic equipment to be cooled is set as a second axis, and that determines the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used, from the control map, based on the outside air temperature and the calorific value of the electronic equipment during an operation.
The liquid immersion cooling device according to Claim 6, further comprising: a fan provided corresponding to each of the radiators; a plurality of radiator pumps provided corresponding to each of the radiators to supply the cooling water to the radiators; a plurality of cooling water pumps provided in a plurality of the cooling water circulation systems; and a plurality of cooling liquid pumps provided in a plurality of the cooling liquid circulation systems, wherein the control unit has the control map in which an air volume of the fan and/or the number of the radiator pumps to be used and/or the number of the cooling water pumps to be used and/or the number of the cooling liquid pumps to be used are represented on a map, and the control unit determines the air volume of the fan and/or the number of the radiator pumps to be used and/or the number of the cooling water pumps to be used and/or the number of the cooling liquid pumps to be used, from the control map, based on the outside air temperature and a calorific value of electronic equipment during an operation.
The liquid immersion cooling device according to Claim 1, wherein the radiator, a cooling water tank that stores the cooling water cooled by the radiator, and a cooling water return tank that stores the cooling water returned from the liquid immersion heat exchanger and stores the cooling water before being returned to the radiator are provided in a common installation panel.
A control method for a liquid immersion cooling device including a radiator that cools cooling water by exchanging heat with outside air, a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid, a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger, a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored, and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container, in which a plurality of the radiators, and/or a plurality of the liquid immersion heat exchangers, and/or a plurality of the cooling water circulation systems, and/or a plurality of the liquid immersion containers, and/or a plurality of the cooling liquid circulation systems are provided in parallel, the control method comprising: switching between the radiators, and/or the liquid immersion heat exchangers, and/or the cooling water circulation systems, and/or the liquid immersion containers, and/or the cooling liquid circulation systems.
A control method for a liquid immersion cooling device including a radiator that cools cooling water by exchanging heat with outside air, a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid, a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger, a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored, and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container, in which a plurality of the radiators and a plurality of the liquid immersion heat exchangers are provided in parallel, the control method comprising: preparing a control map in which the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used are represented on a map when an outside air temperature is set as a first axis and a calorific value of the electronic equipment to be cooled is set as a second axis; and determining the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used, from the control map, based on the outside air temperature and the calorific value of the electronic equipment during an operation.

Description

Technical Field For example, the present disclosure relates to a liquid immersion cooling device suitably used for cooling a server in a data center, and a control method therefor. Background Art PTL 1 discloses that electronic equipment such as a server and a storage in a data center is immersed and cooled in a cooling liquid. Citation List Patent Literature [PTL 1] Japanese Patent No. 6658312 Summary of Invention Technical Problem However, in a liquid immersion cooling system disclosed in PTL 1, a cooling system of the cooling liquid is a single system. When equipment troubles occur in the cooling system of the cooling liquid, the cooling liquid generates heat, thereby causing a possibility that the server is stopped. In addition, in the data center, it is required to reduce power usage effectiveness (PUE: total power consumption of a facility/power consumption of IT equipment), which is an index indicating power usage efficiency. In order to reduce the PUE, it is necessary to optimize an operation of the cooling system. However, a liquid immersion-type data center has little operation record, and means for optimizing an operation method is not defined. For example, in a method of performing feedback control while a target temperature of the liquid immersion cooling device is set as one target point, adjustment parameters (such as a refrigerant flow rate and a rotation speed of a fan) are diverse, an equipment configuration of a control system is complicated, thereby causing a possibility of increasing probability of control troubles. The present disclosure has been made in view of these circumstances, and an object of the present disclosure is to provide a liquid immersion cooling device and a control method therefor which can cope with equipment troubles in a cooling system of a cooling liquid. In addition, an object of the present disclosure is to provide a liquid immersion cooling device and a control method therefor which can easily control a target temperature of a liquid immersion cooling device. Solution to Problem According to an aspect of the present disclosure, there is provided a liquid immersion cooling device including a radiator that cools cooling water by exchanging heat with outside air, a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid, a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger, a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored, and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container. A plurality of the radiators, and/or a plurality of the liquid immersion heat exchangers, and/or a plurality of the cooling water circulation systems, and/or a plurality of the liquid immersion containers, and/or a plurality of the cooling liquid circulation systems are provided in parallel. According to an aspect of the present disclosure, there is provided a liquid immersion cooling device including a radiator that cools cooling water by exchanging heat with outside air, a liquid immersion heat exchanger to which the cooling water cooled by the radiator is guided to exchange the heat with a cooling liquid, a cooling water circulation system in which the cooling water is circulated between the radiator and the liquid immersion heat exchanger, a liquid immersion container to which the cooling liquid cooled by the liquid immersion heat exchanger is guided and in which the cooling liquid for immersing and cooling electronic equipment is stored, and a cooling liquid circulation system in which the cooling liquid is circulated between the liquid immersion heat exchanger and the liquid immersion container. A plurality of the radiators and a plurality of the liquid immersion heat exchangers are provided in parallel. The liquid immersion cooling device further includes a control unit that has a control map in which the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used are represented on a map when an outside air temperature is set as a first axis and a calorific value of the electronic equipment to be cooled is set as a second axis, and that determines the number of the radiators to be used and the number of the liquid immersion heat exchangers to be used, from the control map, based on the outside air temperature and the calorific value of the electronic equipment during an operation. According to an aspect of the present disclosure, there is provided a control method for a liquid immersion cooling device including a radiator that cools cooling water by exchanging heat with outside air, a liquid immersion heat exchanger to which the