Patents by Inventor Takao Katsura

Takao Katsura 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).

  • Performance prediction program and performance prediction system for ground source heat pump system
    Patent number: 7774164
    Abstract: A computer which functions by a performance prediction program for a ground source heat pump system of the present invention and a performance prediction system constructed thereby include a dimensionless distance calculating means, a first dimensionless time calculating means, a second dimensionless time calculating means, a boundary time acquiring means, an underground temperature change calculating means, and a tube surface temperature change calculating means. The performance prediction program and performance prediction system can be applied to the design of heat exchange system by obtaining predicted underground temperature data for the ground source heat pump system with high accuracy and predicting the performance for the ground source heat pump system based on the resulting underground temperature changes, etc., in view of the use of a plurality of buried tubes, underground temperature change patterns for buried tubes placed at different intervals, and the use of U-shaped tube heat exchangers.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: August 10, 2010
    Assignees: National University Corporation Hokkaido University, Nippon Steel Engineering Co., Ltd.
    Inventors: Katsunori Nagano, Takao Katsura
  • Performance prediction program and performance prediction system for ground source heat pump system
    Publication number: 20070061104
    Abstract: A computer which functions by a performance prediction program for a ground source heat pump system of the present invention and a performance prediction system constructed thereby include a dimensionless distance calculating means, a first dimensionless time calculating means, a second dimensionless time calculating means, a boundary time acquiring means, an underground temperature change calculating means, and a tube surface temperature change calculating means. The performance prediction program and performance prediction system can be applied to the design of heat exchange system by obtaining predicted underground temperature data for the ground source heat pump system with high accuracy and predicting the performance for the ground source heat pump system based on the resulting underground temperature changes, etc., in view of the use of a plurality of buried tubes, underground temperature change patterns for buried tubes placed at different intervals, and the use of U-shaped tube heat exchangers.
    Type: Application
    Filed: August 29, 2006
    Publication date: March 15, 2007
    Inventors: Katsunori Nagano, Takao Katsura
  • Performance prediction program and performance prediction system for ground source heat pump system
    Patent number: 7113888
    Abstract: A computer which functions by a performance prediction program for a ground source heat pump system of the present invention and a performance prediction system constructed thereby include a dimensionless distance calculating means, a first dimensionless time calculating means, a second dimensionless time calculating means, a boundary time acquiring means, an underground temperature change calculating means, and a tube surface temperature change calculating means. The performance prediction program and performance prediction system can be applied to the design of heat exchange system by obtaining predicted underground temperature data for the ground source heat pump system with high accuracy and predicting the performance for the ground source heat pump system based on the resulting underground temperature changes, etc., considering the use of a plurality of buried tubes, underground temperature change patterns for buried tubes placed at different intervals, and the use of U-shaped tube heat exchangers.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: September 26, 2006
    Assignees: Hokkaido University, Nippon Steel Corporation
    Inventors: Katsunori Nagano, Takao Katsura
  • Performance prediction program and performance prediction system for ground source heat pump system
    Publication number: 20060064281
    Abstract: A computer which functions by a performance prediction program for a ground source heat pump system of the present invention and a performance prediction system constructed thereby include a dimensionless distance calculating means, a first dimensionless time calculating means, a second dimensionless time calculating means, a boundary time acquiring means, an underground temperature change calculating means, and a tube surface temperature change calculating means. The performance prediction program and performance prediction system can be applied to the design of heat exchange system by obtaining predicted underground temperature data for the ground source heat pump system with high accuracy and predicting the performance for the ground source heat pump system based on the resulting underground temperature changes, etc., considering the use of a plurality of buried tubes, underground temperature change patterns for buried tubes placed at different intervals, and the use of U-shaped tube heat exchangers.
    Type: Application
    Filed: March 18, 2005
    Publication date: March 23, 2006
    Inventors: Katsunori Nagano, Takao Katsura