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公开(公告)号：US20220279682A1
公开(公告)日：2022-09-01
申请号：US17624910
申请日：2019-07-09
Applicant: NEC Corporation
Inventor： Takafumi NATSUMEDA , Minoru YOSHIKAWA , Masaki CHIBA
IPC: H05K7/20
Abstract: A cooling system includes: a local cooler that is positioned near a heat source and evaporates a liquid-phase refrigerant by receiving heat from the heat source; a turbo compressor that compresses a gas-phase refrigerant that absorbed the heat in the local cooler; an outdoor unit that condenses the gas-phase refrigerant supplied from the turbo compressor by heat dissipation; and an expansion valve that depressurizes the refrigerant supplied from the outdoor unit and sends the refrigerant to the local cooler. The refrigerant is a low-pressure refrigerant having a condensing pressure lower than a predetermined value.
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公开(公告)号：US20220192057A1
公开(公告)日：2022-06-16
申请号：US17603111
申请日：2020-04-13
Applicant: NEC Corporation
Inventor： Koichi TODOROKI , Minoru YOSHIKAWA , Kunihiko ISHIHARA , Masaki CHIBA , Yoshinori MIYAMOTO , Takafumi NATSUMEDA , Nirmal Singh RAJPUT
Abstract: A local cooler includes: a housing formed into a box shape; a heat exchanger provided along a slope extending upward to a rear portion from a lower position located on the front side of the housing; a first intake/exhaust port provided on a front surface of the housing; a second intake/exhaust port provided on a bottom surface of the housing; third intake/exhaust ports provided at a plurality of locations among side surfaces, upper surface and rear surface of the housing; and a closing plate capable of selectively shielding these intake/exhaust ports.
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公开(公告)号：US20220154988A1
公开(公告)日：2022-05-19
申请号：US17439473
申请日：2020-03-06
Applicant: NEC Corporation
Inventor： Takafumi NATSUMEDA , Masaki CHIBA , Koichi TODOROKI , Minoru YOSHIKAWA
Abstract: A liquid separator including a cylindrical closed container in which a refrigerant is stored, a refrigerant inflow pipe that allows the refrigerant to flow into the closed container, and a refrigerant outflow pipe that allows the vapor-phase refrigerant in a space inside the closed container to flow out, in which the refrigerant inflow pipe and the refrigerant outflow pipe are each connected from the upper part of the closed container toward the inside thereof, and the closed container has a short cylindrical shape in which the height is smaller relative to the diameter.
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公开(公告)号：US20220377944A1
公开(公告)日：2022-11-24
申请号：US17764293
申请日：2019-10-02
Applicant: NEC Corporation
Inventor： Nirmal Singh RAJPUT , Masaki CHIBA , Mahiro HACHIYA , Takafumi NATSUMEDA , Yoshinori MIYAMOTO , Minoru YOSHIKAWA
Abstract: The present invention provides an attachment for a server rack cooling system having at least one heat exchange condenser, the attachment includes: a pipe extension configured to connect to a portion of the server rack cooling system at which air and refrigerant are able to be transferred into the attachment from the at least one heat exchange condenser; a valve on the pipe extension configured to allow exhaust to the outside through the pipe extension at an open position and to block exhaust to the outside at a closed position; and an sensor disposed at a position inside of the pipe extension between the at least one heat exchange condenser and the valve and configured to provide a detection signal determined by a presence of fluid at the position of the sensor; wherein, the valve is opened and closed based on the detection signal from the sensor.
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公开(公告)号：US20210003327A1
公开(公告)日：2021-01-07
申请号：US16982790
申请日：2019-03-20
Applicant: NEC Corporation
Inventor： Koichi TODOROKI , Minoru YOSHIKAWA , Kunihiko ISHIHARA , Masaki CHIBA , Yoshinori MIYAMOTO , Takafumi NATSUMEDA , Nirmal Singh RAJPUT
IPC: F25B41/00
Abstract: In order to efficiently distribute a heat medium at a low heat medium pressure, a heat exchange apparatus includes a heat exchange pipe 2 configured to accommodate a heat medium L to be evaporated by heat absorption from a gas to be cooled, the heat exchange pipe being disposed in an inclined state, a supply pipe 1 configured to supply the heat medium L in a liquid-phase state, the supply pipe being placed in a vicinity of a lower part of the heat exchange pipe 2, a discharge pipe 3 configured to receive a heat medium L to be evaporated in the heat exchange pipe 2 and discharged from an upper part of the heat exchange pipe, and a connecting pipe 4 placed, directing downward, between an upper part of the heat exchange pipe 2 and the discharge pipe 3.
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Patent Agency Ranking
公开(公告)号：US20230023287A1
公开(公告)日：2023-01-26
申请号：US17791077
申请日：2020-01-16
Applicant: NEC Corporation
Inventor： Nilmal Singh RAJPUT , Koichi TODOROKI , Takafumi NATSUMEDA , Mahiro HACHIYA , Minoru YOSHIKAWA
IPC: H05K7/20
Abstract: A cooling system (100) has a housing (101), a heat exchanger (110) and an air distribution controller (120). The housing (101) including an inlet (102) for receiving air exhausted from the server module and an outlet (103) for providing air to the server module. The heat exchanger (110) is mounted between the inlet (102) and the outlet (103), the heat exchanger (110) is configured that a refrigerant (111) contained in the heat exchanger (110) exchanges heat with air passing through the heat exchanger (110). The heat exchanger (110) accepts variation of the refrigerant liquid level. The air distribution controller (120) is mounted in an inlet side of the heat exchanger (110). The air distribution controller (120) has a movable plate which allows an airflow profile from the inlet to the heat exchanger (110) redirected. The air distribution controller (120) controls the airflow profile depending on the liquid level.
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公开(公告)号：US20220279684A1
公开(公告)日：2022-09-01
申请号：US17624917
申请日：2019-07-09
Applicant: NEC Corporation
Inventor： Yoshinori MIYAMOTO , Takafumi NATSUMEDA , Minoru YOSHIKAWA
Abstract: A cooling system includes: a local cooler that is positioned near a server serving as a heat source and that evaporates a refrigerant by directly receiving heat from the server to generate a gas-phase refrigerant; a compressor that compresses the gas-phase refrigerant; an outdoor unit that condenses the gas-phase refrigerant supplied from the compressor by dissipating heat from the gas-phase refrigerant; an expansion valve that depressurizes the refrigerant supplied from the outdoor unit and sends the refrigerant to the local cooler; a pair of detectors that are respectively provided at an inlet side and an outlet side of the compressor and detect a state of the gas-phase refrigerant supplied from the local cooler; and a proportional control valve and a high-speed on-off valve that are operated based on a refrigerant state ratio calculated from a detection value of the detectors.
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公开(公告)号：US20220170662A1
公开(公告)日：2022-06-02
申请号：US17437205
申请日：2020-01-23
Applicant: NEC Corporation
Inventor： Yoshinori MIYAMOTO , Minora YOSHIKAWA , Nirmal Singh RAJPUT , Takafumi NATSUMEDA
Abstract: An air conditioning control device includes a differential pressure calculation unit that calculates differential pressure between the intake side and the exhaust side of a rack containing at least one server, and a rotational speed control unit that controls the rotational speed of an air conditioning fan on the basis of the differential pressure. The rotational speed control unit increases or decreases the rotational speed of the air conditioning fan depending on the variation of the differential pressure in the event of a change in the rotational speed of the air conditioning fan.
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公开(公告)号：US20210368648A1
公开(公告)日：2021-11-25
申请号：US16963392
申请日：2019-01-21
Applicant: NEC Corporation
Inventor： Masaki CHIBA , Minoru YOSHIKAWA , Hisato SAKUMA , Takafumi NATSUMEDA
IPC: H05K7/20
Abstract: To provide a cooling device capable of cooling a heat-generating body using simple configuration, the cooling device comprises two evaporators, two condensers, a compressor and an expansion valve, and is configured so that any one among a first flow path setting, a second flow path setting, a third flow path setting, and a fourth flow path setting can be selected.
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公开(公告)号：US20190145667A1
公开(公告)日：2019-05-16
申请号：US16089994
申请日：2017-03-23
Applicant: NEC CORPORATION
Inventor： Arihiro MATSUNAGA , Minoru YOSHIKAWA , Hisato SAKUMA , Masato YANO , Asuka MATSUBA , Takafumi NATSUMEDA
Abstract: Since improving heat exchange between a gas-phase refrigerant and a liquid-phase refrigerant in a refrigeration system could instead result in a reduction in the efficiency of the whole refrigeration system, a heat exchange device (201) of the present invention includes: a refrigerant supply means (210) for supplying a first-temperature liquid-phase refrigerant (R11) and a second-temperature gas-phase refrigerant (R12) in one circulation system; a plurality of heat exchange means (220A, 220B) which are each configured so as to perform heat exchange between the liquid-phase refrigerant and the gas-phase refrigerant; and refrigerant circulation means (231, 232, 242) for circulating the gas-phase refrigerant (R12) in such a manner that the gas-phase refrigerant (R12) flows in parallel in the plurality of heat exchange means, and circulating the liquid-phase refrigerant (R11) in such a manner that the liquid-phase refrigerant (R11) flows in series in the plurality of heat exchange means.
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