Patents by Inventor Satoshi Nikaido
Satoshi Nikaido has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20240125515Abstract: The purpose of the present invention is to provide a control device, a heat source system, a control method, and a control program with which a heat medium at a required temperature can be more effectively sent out. This control device, which is applied to a heat source system 1 comprising a plurality of heat source machines (2a), (2b) connected in series, comprises a setting unit which sets the outlet setting temperatures of cool water in the respective heat source machines (2a), (2b) on the basis of: a measured value of a cool water flow rate, measured values of inlet temperatures of the cool water in the respective heat source machines (2a), (2b); and the required outlet temperature of the cool water in the heat source system (1).Type: ApplicationFiled: November 25, 2021Publication date: April 18, 2024Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Shunsuke ISONO, Yutaka TAKENAKA, Satoshi NIKAIDO, Katsuya SAKAGUCHI, Linri CUI
-
Publication number: 20230315028Abstract: An estimation device includes an observation system constraint determination unit configured to determine data within constraints that is data within a first constraint based on time series data of each observation value of a first observation value observed by a first observation system and a second observation value observed by a second observation system, a model estimation unit configured to estimate parameters of a plurality of models including an observation model that is a model of each of the observation systems and a physical model that is a model within an apparatus provided with each of the observation systems based on the data within constraints, and a consistency determination unit configured to determine consistency of the models based on a deviation between a first predicted observation value predicted from the second observation system based on the estimated parameters and the first observation value.Type: ApplicationFiled: July 29, 2021Publication date: October 5, 2023Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hirotaka Oka, Masumi Nomura, Tatsuo Ishiguro, Katsuaki Morita, Ryuji Ikeda, Kenichi Nagahara, Sota Kogawa, Noriyuki Matsukura, Satoshi Nikaido, Yuki Nishizaki
-
Publication number: 20230280240Abstract: An abnormality diagnosis device includes an abnormality determination unit configured to determine whether or not there is an abnormality with respect to a state quantity acquired from equipment and a cause estimation unit configured to estimate a cause of the abnormality in the equipment from a state quantity determined to be abnormal by the abnormality determination unit using a cause correspondence table in which a cause of an abnormal mode of the equipment identified in fault tree analysis is associated with the state quantity that is abnormal when the cause has occurred.Type: ApplicationFiled: July 29, 2021Publication date: September 7, 2023Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hirotaka Oka, Masumi Nomura, Tatsuo Ishiguro, Katsuaki Morita, Ryuji Ikeda, Kenichi Nagahara, Sota Kogawa, Noriyuki Matsukura, Satoshi Nikaido, Yuki Nishizaki
-
Publication number: 20230280735Abstract: A monitoring device includes: an operation record acquisition unit configured to acquire operation records indicating a transition in a load factor or a load change factor with respect to operation time leading up to failure in failure cases; a threshold setting unit configured to set a threshold to be contrasted with the load factor or the load change factor in the operation records of the failure cases; a wear rate acquisition unit configured to acquire a wear rate that is a value derived from a relation between the load factor or the load change factor and the threshold and indicates a degree of progress of wear of a device according to operation time; and a failure rate cumulative frequency acquisition unit configured to acquire a transition in a failure rate cumulative frequency of the failure cases with respect to the wear rate.Type: ApplicationFiled: July 29, 2021Publication date: September 7, 2023Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hirotaka Oka, Masumi Nomura, Tatsuo Ishiguro, Katsuaki Morita, Ryuji Ikeda, Kenichi Nagahara, Sota Kogawa, Noriyuki Matsukura, Satoshi Nikaido, Yuki Nishizaki
-
Publication number: 20230259111Abstract: The purpose of the present invention is to provide an abnormality detection system and refrigerator, an abnormality detection method, and an abnormality detection program which can improve the accuracy of abnormality detection. The abnormality detection system comprises: an acquisition unit which acquires driving data of a refrigerator (11); a creation unit which creates a model capable of estimating a prescribed driving state of the refrigerator (11) on the basis of the driving data, when the driving data is non-trained data; a determination unit which compares an estimation value of the driving state, the estimation value being estimated by the model, with an actual measurement value corresponding to the driving state, and determines whether the driving data is an outlier; and an abnormality detection unit which performs, on the basis of the model, abnormality detection on the refrigerator (11), when the driving data is not determined to be the outlier.Type: ApplicationFiled: July 12, 2021Publication date: August 17, 2023Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Yuki NISHIZAKI, Satoshi NIKAIDO, Noriyuki MATSUKURA, Tatsuo ISHIGURO, Katsuaki MORITA, Ryuji IKEDA, Hirotaka OKA, Kenichi NAGAHARA
-
Patent number: 11713900Abstract: The purpose of the invention is to provide a control device that can calculate the lower limit of cooling water inlet temperature according to the operation status of a chiller.Type: GrantFiled: June 28, 2019Date of Patent: August 1, 2023Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Katsuya Sakaguchi, Satoshi Nikaido, Yutaka Takenaka
-
Patent number: 11466881Abstract: A control device for a refrigerator system for cooling a load by using a plurality of refrigerators, said control device comprising a unit to control the number of operating units that changes the number of operating refrigerators according to the load rate, and a cold water temperature acquisition unit that acquires, via a temperature sensor, the temperature of cold water affected by the refrigerators. After a prescribed standby time from when the number of operating refrigerators was changed has elapsed, the unit to control the number of operating units changes the number of operating units and reduces the prescribed standby time when at least one of the cold-water temperature and the rate of change in the cold-water temperature satisfies a prescribed condition.Type: GrantFiled: December 7, 2018Date of Patent: October 11, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Yusuke Hazui, Koki Tateishi, Satoshi Nikaido, Yutaka Takenaka
-
Patent number: 11346563Abstract: A superordinate controlling device for a heat source system (1) including a plurality of heat sources, the superordinate controlling device being applied to the heat source system (1) and controlling heat-pump type chillers (2a) and (2b) and absorption-type chillers (2c) and (2d) in such a manner that a heat transfer medium leaving temperature that is the temperature of a heat transfer medium supplied to an external load (6) is equal to a setting temperature. The heat-pump type chillers (2a) and (2b) each have a higher Coefficient of Performance (COP) than that of each of the absorption-type chillers (2c) and (2d).Type: GrantFiled: September 20, 2017Date of Patent: May 31, 2022Assignees: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., TOKYO ELECTRIC POWER COMPANY HOLDINGS, INCORPORATEDInventors: Satoshi Nikaido, Koki Tateishi, Yusuke Hazui, Yutaka Takenaka, Hirotaka Hanasaki, Satoru Tanaka
-
Patent number: 11221166Abstract: Provided is a refrigerator system with which refrigerators can be operated efficiently. This refrigerator system has: an upstream refrigerator having a first compressor that compresses a refrigerant, a first condenser that condenses the refrigerant compressed by the first compressor, and a first evaporator that evaporates the refrigerant condensed by the first condenser and cools cold water; a downstream refrigerator having a second compressor that compresses a refrigerant, a second condenser that condenses the refrigerant compressed by the second compressor, and a second evaporator that evaporates the refrigerant condensed by the second condenser and cools the cold water that has passed through the first evaporator; and a higher-level control device that controls the operation of the upstream refrigerator and the downstream refrigerator. The first compressor is a variable-speed device, and the second compressor is a constant-speed device.Type: GrantFiled: April 21, 2016Date of Patent: January 11, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Yusuke Hazui, Toshiaki Ouchi, Minoru Matsuo, Satoshi Nikaido, Noriyasu Maehara
-
Publication number: 20210310687Abstract: The purpose of the invention is to provide a control device that can calculate the lower limit of cooling water inlet temperature according to the operation status of a chiller.Type: ApplicationFiled: June 28, 2019Publication date: October 7, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Katsuya SAKAGUCHI, Satoshi NIKAIDO, Yutaka TAKENAKA
-
Patent number: 11060741Abstract: The purpose of the present invention is to maintain a water supply temperature close to a target water supply temperature at the time of a change in the number of heat source machines operating. A heat source system of the present invention anticipates a case where a prescribed minimum flow rate is set for heat source machines that are subject to addition or removal, and calculates, as compensation temperatures, hot and cold water outlet temperatures of the heat source machines so that the water supply temperature in such a case will match a target water supply temperature, and changes the hot and cold water outlet temperature settings of the operating heat source machines to the compensation temperatures. After that, the heat source machines that are subject to addition or removal are either started up or stopped, and the set flow rate for the heat source machines that are subject to addition or removal is set to the minimum flow rate.Type: GrantFiled: November 29, 2019Date of Patent: July 13, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Toshiaki Ouchi, Minoru Matsuo, Koki Tateishi, Satoshi Nikaido
-
Publication number: 20210063037Abstract: A control device for a refrigerator system for cooling a load by using a plurality of refrigerators, said control device comprising a unit to control the number of operating units that changes the number of operating refrigerators according to the load rate, and a cold water temperature acquisition unit that acquires, via a temperature sensor, the temperature of cold water affected by the refrigerators. After a prescribed standby time from when the number of operating refrigerators was changed has elapsed, the unit to control the number of operating units changes the number of operating units and reduces the prescribed standby time when at least one of the cold-water temperature and the rate of change in the cold-water temperature satisfies a prescribed condition.Type: ApplicationFiled: December 7, 2018Publication date: March 4, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Yusuke HAZUI, Koki TATEISHI, Satoshi NIKAIDO, Yutaka TAKENAKA
-
Publication number: 20200158356Abstract: The purpose of the present invention is to maintain a water supply temperature close to a target water supply temperature at the time of a change in the number of heat source machines operating. A heat source system of the present invention anticipates a case where a prescribed minimum flow rate is set for heat source machines that are subject to addition or removal, and calculates, as compensation temperatures, hot and cold water outlet temperatures of the heat source machines so that the water supply temperature in such a case will match a target water supply temperature, and changes the hot and cold water outlet temperature settings of the operating heat source machines to the compensation temperatures. After that, the heat source machines that are subject to addition or removal are either started up or stopped, and the set flow rate for the heat source machines that are subject to addition or removal is set to the minimum flow rate.Type: ApplicationFiled: November 29, 2019Publication date: May 21, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Toshiaki OUCHI, Minoru MATSUO, Koki TATEISHI, Satoshi NIKAIDO
-
Patent number: 10655868Abstract: A controller for controlling a number of operating heat sources is provided. The controller detects a change in a number of secondary pumps that supply a heat transfer medium to a load device, determines the number of operating heat sources that changes as a load demand of the state of a load device changes, and switches the number of operating heat sources. The controller determines the number of operating heat sources when the change in the number of secondary pumps due to the change in the load demand is detected, and changes the number of heat sources for as long as at least one of a prescribed period has passed from a time when the change in the number of secondary pumps is detected or a prescribed condition with respect to a value that varies due to the change in the number of secondary pumps is satisfied.Type: GrantFiled: July 4, 2014Date of Patent: May 19, 2020Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Koki Tateishi, Satoshi Nikaido, Minoru Matsuo, Toshiaki Ouchi
-
Publication number: 20200041144Abstract: A superordinate controlling device for a heat source system (1) including a plurality of heat sources, the superordinate controlling device being applied to the heat source system (1) and controlling heat-pump type chillers (2a) and (2b) and absorption-type chillers (2c) and (2d) in such a manner that a heat transfer medium leaving temperature that is the temperature of a heat transfer medium supplied to an external load (6) is equal to a setting temperature. The heat-pump type chillers (2a) and (2b) each have a higher Coefficient of Performance (COP) than that of each of the absorption-type chillers (2c) and (2d).Type: ApplicationFiled: September 20, 2017Publication date: February 6, 2020Applicants: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., TOKYO ELECTRIC POWER COMPANY HOLDINGS, INCORPORATEDInventors: Satoshi NIKAIDO, Koki TATEISHI, Yusuke HAZUI, Yutaka TAKENAKA, Hirotaka HANASAKI, Satoru TANAKA
-
Publication number: 20200018523Abstract: A refrigerating system of the present invention includes a plurality of parallel type refrigerators each of which has a plurality of compressors, and a host control device having a compressor start/stop permission output unit which is configured to output a compressor activation permission or a compressor stop permission to one of the plurality of parallel type refrigerators which is activated according to a predetermined permission condition. Each of the parallel-type refrigerators has a compressor activation control unit which is configured to a stopped compressor included in a certain refrigerator when a load factor of the certain refrigerator is equal to or greater than a first specified value and the compressor activation permission is received, and a compressor stop control unit which is configured to stop an activated compressor included in a certain refrigerator when the load factor of the certain refrigerator is less than a second specified value and the compressor stop permission is received.Type: ApplicationFiled: March 20, 2018Publication date: January 16, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Yutaka TAKENAKA, Satoshi NIKAIDO, Koki TATEISHI, Yusuke HAZUI
-
Patent number: 10533781Abstract: A machine quantity controlling device which controls a quantity of a heat source device to operate in a heat source system including a first heat source device and a second heat source device, the first heat source device being a waste heat recovery type absorption chiller, the second heat source device other than a waste heat recovery type absorption chiller, the machine quantity controlling device including an acquisition unit that obtains a waste heat utilization maximum load which is a maximum load when the first heat source device receives only supply of the waste heat; a determination unit that determines a predetermined load range from the waste heat utilization maximum load to be a first optimal load range as an optimal load range of the first heat source device; and a machine quantity control unit that controls a quantity of the second heat source device to operate so that the sum of a total of minimum values of the optimal load range of the first heat source device to operate and a total of minimumType: GrantFiled: May 10, 2016Date of Patent: January 14, 2020Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Satoshi Nikaido, Kenji Ueda, Yoshie Togano, Minoru Matsuo, Koki Tateishi
-
Patent number: 10215470Abstract: Provided is a heat pump system that can appropriately manage the number of heat pumps in operation even when any of the heat pumps is defrosting, and that can always operate at a capacity that corresponds to a load. Also provided is an operation method for the heat pump system. A heat pump system (1) wherein a plurality of heat pumps (10A-10C (13A-13D)) are connected to a system load and wherein a system management unit (27) successively calculates the capacity that can be output by the heat pumps (10A-10C (13A-13D)) in operation, compares the calculated capacity value, as a threshold value, to the thermal load of the system load, and manages the number of heat pumps (10A-10C (13A-13D)) in operation.Type: GrantFiled: December 11, 2014Date of Patent: February 26, 2019Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Satoshi Nikaido, Takeshi Fuchimoto, Minoru Matsuo, Toshiaki Ouchi
-
Patent number: 10197301Abstract: The purpose of the present invention is to avoid frequent repetition of an increase/decrease stage caused by the inclusion, in a heat source system, of a machine the capacity of which has been degraded. A heat source system of the present invention is provided with a plurality of heat source machines. A higher-level control device (20) controls each of the heat source machines so that a heat medium delivery temperature, which is the temperature of a heat medium being supplied to an external load, will be a set temperature. The higher-level control device (20) is provided with a number-of-machines control unit (22), a degraded machine detection unit (24), and a priority ranking modification unit (25). The number-of-machines control unit (22) controls the number of heat source machines in accordance with operational priority ranking information in which each of the heat source machines and an operational priority ranking are associated together.Type: GrantFiled: October 16, 2015Date of Patent: February 5, 2019Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Satoshi Nikaido, Toshiaki Ouchi, Minoru Matsuo, Koki Tateishi
-
Patent number: 10119717Abstract: In order to achieve a reduction in energy consumption in a cooling water supply device without using a database, an equipment control device (70a) of a cooling water supply device: uses the load of a chiller, and a cooling water outlet temperature lower limit setpoint determined in accordance with the set temperature for the cooling water outlet of the chiller, to set a cooling water inlet temperature lower limit setpoint; sets, as the cooling water inlet temperature setpoint, the higher of the lower limit setpoint and the cooling water inlet temperature lower limit value as determined from the outside wet-bulb temperature; and generates a control command for a cooling tower fan and a control command for the cooling water flow volume, so as to match the cooling water inlet temperature and the cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint which have been set.Type: GrantFiled: July 12, 2013Date of Patent: November 6, 2018Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Minoru Matsuo, Satoshi Nikaido, Koki Tateishi, Toshiaki Ouchi