Patents by Inventor Gakuto Sakai

Gakuto Sakai 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).

  • Patent number: 11384953
    Abstract: An air conditioning system includes: an air conditioner that generates conditioned air by heat exchange with a refrigerant and supplies the conditioned air to an air conditioning target space; a refrigerant sensor that detects refrigerant leakage; a ventilator that ventilates the air conditioning target space; and a controller. The ventilator includes: a total heat exchanger; a first air supply path and a first air exhaust path that connect the air conditioning target space and an outside of the air conditioning target space via the total heat exchanger; a second air supply path that connect the air conditioning target space and the outside of the air conditioning target space without passing through the total heat exchanger; an air supply fan that supplies air from the outside of the air conditioning target space into the air conditioning target space via the first air supply path and the second air supply path.
    Type: Grant
    Filed: April 24, 2020
    Date of Patent: July 12, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke Hirai, Tooru Fujimoto, Akiyoshi Yamamoto, Gakuto Sakai, Yoshitaka Matsugi
  • Publication number: 20220214062
    Abstract: An air conditioning and ventilating system including: an air conditioning device including a heat exchanger configured to generate conditioned air by heat exchange with a refrigerant; a ventilation device communicatively connected to the air conditioning device and including a supply air fan and/or an exhaust fan; an airflow volume detection unit configured to detect an airflow volume equivalent value of the ventilation device; and a control unit. On determination that the airflow volume equivalent value acquired from the airflow volume detection unit is equal to or less than a first predetermined value, the control unit sets an operation of the air conditioning device to a stop state.
    Type: Application
    Filed: March 22, 2022
    Publication date: July 7, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke HIRAI, Akiyoshi YAMAMOTO, Gakuto SAKAI, Tooru FUJIMOTO, Yoshitaka MATSUGI
  • Publication number: 20220186960
    Abstract: An air conditioning and ventilating system S including: an air conditioning device A including a heat exchanger 22 configured to generate conditioned air by heat exchange with a refrigerant, and configured to send the conditioned air to an air conditioned space R; a ventilation device 30 configured to ventilate the air conditioned space R; a refrigerant sensor 24 configured to detect concentration of the refrigerant in the air conditioned space R; and a control unit 40 configured to control operations of the air conditioning device A and the ventilation device 30. On determination that the refrigerant concentration acquired from the refrigerant sensor 24 exceeds a first predetermined value, the control unit 40 sets an operation of a compressor 13 of the air conditioning device A to a stop state and sets the ventilation device 30 to an operating state.
    Type: Application
    Filed: March 7, 2022
    Publication date: June 16, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke HIRAI, Akiyoshi YAMAMOTO, Gakuto SAKAI, Yoshitaka MATSUGI, Tooru FUJIMOTO
  • Publication number: 20220146138
    Abstract: An air conditioning system includes: an air conditioner that generates conditioned air by heat exchange with a refrigerant and supplies the conditioned air to an air conditioning target space; a refrigerant sensor that detects refrigerant leakage; a ventilator that ventilates the air conditioning target space; and a controller. The ventilator includes: a total heat exchanger; a first air supply path and a first air exhaust path that connect the air conditioning target space and an outside of the air conditioning target space via the total heat exchanger; a second air supply path that connect the air conditioning target space and the outside of the air conditioning target space without passing through the total heat exchanger; an air supply fan that supplies air from the outside of the air conditioning target space into the air conditioning target space via the first air supply path and the second air supply path.
    Type: Application
    Filed: April 24, 2020
    Publication date: May 12, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke Hirai, Tooru Fujimoto, Akiyoshi Yamamoto, Gakuto Sakai, Yoshitaka Matsugi
  • Publication number: 20210404679
    Abstract: In a system where a plurality of ventilation devices (10) are provided in one room, a control device (5) is provided to control, for the ventilation devices (10) operating, the number of the ventilation devices so that the detected values of the carbon dioxide sensors (13) are lower than the reference value.
    Type: Application
    Filed: November 15, 2017
    Publication date: December 30, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke HIRAI, Gakuto SAKAI, Kenta KOBAYASHI
  • Publication number: 20200232665
    Abstract: A controlling unit controls a refrigerant circuit and a flow path switching mechanism to perform a first humidity control operation or a second humidity control operation. In the first humidity control operation, a bypass passage is closed, and outside air is supplied into a room through one of first and second adsorption heat exchangers, and room air is exhausted to outside through the other of the first and second adsorption heat exchangers. In the second humidity control operation, the bypass passage is opened, and the outside air is supplied into the room through one of the first and second adsorption heat exchangers and the bypass passage, and room air is exhausted to outside through the other of the first and second adsorption heat exchangers.
    Type: Application
    Filed: May 31, 2017
    Publication date: July 23, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kousuke HIRAI, Gakuto SAKAI
  • Patent number: 9903604
    Abstract: A humidity control and ventilation device includes: a determiner determining that another ventilation device has turned on, if at least one of an increasing variation in the rotation speed of the air supply fan and an increasing variation in the rotation speed of the exhaust fan exceeds a corresponding one of predetermined values while the air supply fan and the exhaust fan are under the constant airflow rate control; and an air-flow-rate controller decreasing one of the rotation speed of the air supply fan or the rotation speed of the exhaust fan if the determiner determines that the ventilation device is on, such that a total air supply rate and a total air exhaust rate in the ventilation target space are balanced with each other.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: February 27, 2018
    Assignee: Daikin Industries, Ltd.
    Inventors: Akihiro Eguchi, Gakuto Sakai
  • Patent number: 9470427
    Abstract: A humidity control apparatus performs a humidification operation in which outdoor air is supplied to the inside of a room through a moisture-desorption adsorption heat exchanger serving as a condenser and room air is discharged to the outside through a moisture-absorption adsorption heat exchanger serving as an evaporator. The humidity control apparatus includes a preheat heat exchanger which, in the humidification operation, is positioned upstream of the moisture-desorption adsorption heat exchanger in the flow of outdoor air in an air passage and serves as a condenser to heat outdoor air in a refrigerant circuit, and a heat-recovery heat exchanger which, in the humidification operation, is positioned downstream of the moisture-absorption adsorption heat exchanger in the flow of room air in the air passage and serves as an evaporator to recover heat from room air in the refrigerant circuit.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: October 18, 2016
    Assignee: Daikin Industries, Ltd.
    Inventors: Gakuto Sakai, Akihiro Eguchi, Tomohiro Yabu
  • Patent number: 9441844
    Abstract: An on-off valve and a bypass pipe which bypasses the on-off valve are connected to an inlet pipe and an outlet pipe of a humidity control circuit. A pressure-reducing valve is connected to the bypass pipe. Before switching a four-way valve, a degree of opening of the pressure-reducing valve is reduced to reduce a pressure difference between high and low pressure in the humidity control circuit. After that, the on-off valve is closed for pressure equalization between the high and low pressure in the humidity control circuit.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: September 13, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro Eguchi, Gakuto Sakai
  • Patent number: 9297544
    Abstract: There is provided a humidification device capable of performing humidification in as short a time as possible when an indoor humidity is low. A humidification device includes operation control means for selecting either a humidification priority mode or a normal operation mode based on a predetermined condition to operate the humidification device, and fans that can adjust airflow rates, and generates airflow passing through a condenser and an evaporator, wherein operation in the humidification priority mode is operation in which the airflow rates of the fans are decreased, as compared with operation in the normal operation mode, by which desorption of moisture from an adsorbent of the condenser and collection of moisture by an adsorbent of the evaporator are promoted, as compared with operation in the normal operation mode, so that humidification is given priority over ventilation.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: March 29, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Gakuto Sakai, Akihiro Eguchi
  • Patent number: 9228753
    Abstract: A ventilation system includes a connection determinator configured to determine that N-th, second, and sixth humidity controlling ventilation devices are connected to an identical second duct bank in a situation where when fans of the second and sixth humidity controlling ventilation devices are driven, and the rotational speed of a fan of the N-th humidity controlling ventilation device is changed, a power detector detects fluctuations in the power consumed by the fan of each of the second and sixth humidity controlling ventilation devices.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: January 5, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Gakuto Sakai, Akihiro Eguchi, Tomohiro Yabu
  • Patent number: 9228751
    Abstract: The present invention is directed to a humidity controlling ventilator which takes in air through the use of an air blowing fan, and controls the humidity of the taken air via an adsorption heat exchanger prior to supplying it to the room. In the invention, the air blowing fan is controlled so as to make an air volume flow rate approach a predetermined target volume flow rate. To do this, the invention calculates the fan's air volume flow rate based on a specific volume of air downstream of the adsorption heat exchanger and an air mass flow rate of the fan. The calculated value is fed to an air blow controller that is configured to control the fan such that the calculated air volume flow rate approaches the predetermined target air volume flow rate.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: January 5, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Gakuto Sakai, Akihiro Eguchi, Tomohiro Yabu
  • Publication number: 20150300665
    Abstract: There is provided a humidification device capable of performing humidification in as short a time as possible when an indoor humidity is low. A humidification device includes operation control means for selecting either a humidification priority mode or a normal operation mode based on a predetermined condition to operate the humidification device, and fans that can adjust airflow rates, and generates airflow passing through a condenser and an evaporator, wherein operation in the humidification priority mode is operation in which the airflow rates of the fans are decreased, as compared with operation in the normal operation mode, by which desorption of moisture from an adsorbent of the condenser and collection of moisture by an adsorbent of the evaporator are promoted, as compared with operation in the normal operation mode, so that humidification is given priority over ventilation.
    Type: Application
    Filed: September 3, 2013
    Publication date: October 22, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Gakuto SAKAI, Akihiro EGUCHI
  • Publication number: 20150253018
    Abstract: An object of the invention is to enhance maintenability of a humidity control device, and the like. There is provided a humidity control device that dehumidifies one of outdoor air and indoor air and humidifies the other in adsorption heat exchangers (31, 32), and then supplies the outdoor air to an inside of a room, and exhausts the indoor air to an outside of the room, the device including casings (11A, 11B), a refrigerant circuit (12) having the adsorption heat exchangers (31, 32), a compressor (27), a switching mechanism (26) of a circulation direction of a refrigerant, and refrigerant pipes (29), fans (34, 35), and an electric component unit (15), wherein the casings (11) include a first casing (11A) in which the fans (34, 35), the switching mechanism (26), and the electric component unit (15) are arranged, and a second casing (11B) in which the adsorption heat exchangers (31, 32) are arranged, and the first casing (11A) and the second casing (11B) are mutually connected through ducts (D5, D6).
    Type: Application
    Filed: August 29, 2013
    Publication date: September 10, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro Eguchi, Gakuto Sakai
  • Publication number: 20150241076
    Abstract: A humidity control and ventilation device includes: a determiner determining that another ventilation device has turned on, if at least one of an increasing variation in the rotation speed of the air supply fan and an increasing variation in the rotation speed of the exhaust fan exceeds a corresponding one of predetermined values while the air supply fan and the exhaust fan are under the constant airflow rate control; and an air-flow-rate controller decreasing one of the rotation speed of the air supply fan or the rotation speed of the exhaust fan if the determiner determines that the ventilation device is on, such that a total air supply rate and a total air exhaust rate in the ventilation target space are balanced with each other.
    Type: Application
    Filed: September 24, 2013
    Publication date: August 27, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro Eguchi, Gakuto Sakai
  • Publication number: 20150027680
    Abstract: An on-off valve and a bypass pipe which bypasses the on-off valve are connected to an inlet pipe and an outlet pipe of a humidity control circuit. A pressure-reducing valve is connected to the bypass pipe. Before switching a four-way valve, a degree of opening of the pressure-reducing valve is reduced to reduce a pressure difference between high and low pressure in the humidity control circuit. After that, the on-off valve is closed for pressure equalization between the high and low pressure in the humidity control circuit.
    Type: Application
    Filed: March 4, 2013
    Publication date: January 29, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro Eguchi, Gakuto Sakai
  • Patent number: 8915451
    Abstract: When a humidity adjustment device starts up, an outside air temperature To and an room air temperature Tr are compared to determine which air temperature is higher. By mutually changing the flow of the outside air and the flow of the room air by means of an air circulation switching device, the air having the higher temperature of the outside air and the room air is circulated to a heat exchanger that operates as an evaporator.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: December 23, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Takashi Takahashi, Tooru Fujimoto, Gakuto Sakai
  • Publication number: 20140230480
    Abstract: A humidity control apparatus performs a humidification operation in which outdoor air is supplied to the inside of a room through a moisture-desorption adsorption heat exchanger serving as a condenser and room air is discharged to the outside through a moisture-absorption adsorption heat exchanger serving as an evaporator. The humidity control apparatus includes a preheat heat exchanger which, in the humidification operation, is positioned upstream of the moisture-desorption adsorption heat exchanger in the flow of outdoor air in an air passage and serves as a condenser to heat outdoor air in a refrigerant circuit, and a heat-recovery heat exchanger which, in the humidification operation, is positioned downstream of the moisture-absorption adsorption heat exchanger in the flow of room air in the air passage and serves as an evaporator to recover heat from room air in the refrigerant circuit.
    Type: Application
    Filed: October 16, 2012
    Publication date: August 21, 2014
    Applicant: Daikin Industries, Ltd.
    Inventors: Gakuto Sakai, Akihiro Eguchi, Tomohiro Yabu
  • Publication number: 20140166765
    Abstract: When a humidity adjustment device starts up, an outside air temperature To and an room air temperature Tr are compared to determine which air temperature is higher. By mutually changing the flow of the outside air and the flow of the room air by means of an air circulation switching device, the air having the higher temperature of the outside air and the room air is circulated to a heat exchanger that operates as an evaporator.
    Type: Application
    Filed: June 11, 2012
    Publication date: June 19, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takashi Takahashi, Tooru Fujimoto, Gakuto Sakai
  • Publication number: 20140007604
    Abstract: A humidity controlling ventilator includes: an air flow rate calculator configured to calculate an air volume flow rate of an air blowing fan based on a specific volume of air located downstream of an adsorption heat exchanger and an air mass flow rate of the air blowing fan; and an air blow controller configured to control the air blowing fan such that the air volume flow rate calculated by the air flow rate calculator approaches a predetermined target air volume flow rate.
    Type: Application
    Filed: April 2, 2012
    Publication date: January 9, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Gakuto Sakai, Akihiro Eguchi, Tomohiro Yabu