Patents by Inventor Kwok Wai Tham

Kwok Wai Tham 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).

  • Dual-compartment ventilation and air-conditioning system having a shared heating coil
    Patent number: 7059400
    Abstract: An HVAC system has two variable-air-volume (VAV) systems, a first VAV system for moving fresh air and a second VAV system for moving recycled air. Both the fresh air and recycled air are cooled and dehumidified by a single heat-exchanging coil. The fresh and recycled air streams travel independently in separate ducts until the air streams reach a remotely located mixing box where the air streams mix and ventilate into a room or zone of a building. The HVAC system uses carbon dioxide and temperature sensors in order to regulate the flow of fresh and recycled air to various mixing boxes throughout the building.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: June 13, 2006
    Assignee: National University of Signapore
    Inventors: Chandra Sekhar, Kwok Wai Tham, David Kok Wai Cheong, Nyuk Hien Wong
  • Single-coil twin-fan variable-air-volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams
    Patent number: 6986386
    Abstract: An HVAC system has two variable-air-volume (VAV) systems, a first VAV system for moving fresh air and a second VAV system for moving recycled air. Both the fresh air and recycled air are cooled and dehumidified by a single heat-exchanging coil. The fresh and recycled air streams travel independently in separate ducts until the air streams reach a remotely located mixing box where the air streams mix and ventilate into a room or zone of a building. The HVAC system uses carbon dioxide and temperature sensors in order to regulate the flow of fresh and recycled air to various mixing boxes throughout the building.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: January 17, 2006
    Assignee: National University of Singapore
    Inventors: Chandra Sekhar, Kwok Wai Tham, David Kok Wai Cheong, Nyuk Hien Wong
  • Energy-efficient variable-air-volume (VAV) system with zonal ventilation control
    Patent number: 6698219
    Abstract: A ventilation and air-conditioning system uses a first variable-air-volume system to cool and dehumidify fresh outside air and deliver it through a first duct to a mixing box located downstream. The system also uses a second variable-air-volume system to further cool and dehumidify recycled air and deliver it through a second duct to the mixing box where the fresh and recycled air are able to mix prior to ventilation into a room or office. The system uses a carbon dioxide sensor and a temperature sensor to provide feedback signals to a control system, which in turn regulates fan speeds and damper openings in order to provide optimal cooling and ventilation and to conserve energy when cooling and ventilation requirements are low.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: March 2, 2004
    Assignee: National University of Singapore
    Inventors: Chandra Sekhar, Kwok Wai Tham, David Kok Wai Cheong, Nyuk Hien Wong
  • Single-coil twin-fan variable-air-volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams
    Publication number: 20030150593
    Abstract: An HVAC system has two variable-air-volume (VAV) systems, a first VAV system for moving fresh air and a second VAV system for moving recycled air. Both the fresh air and recycled air are cooled and dehumidified by a single heat-exchanging coil. The fresh and recycled air streams travel independently in separate ducts until the air streams reach a remotely located mixing box where the air streams mix and ventilate into a room or zone of a building. The HVAC system uses carbon dioxide and temperature sensors in order to regulate the flow of fresh and recycled air to various mixing boxes throughout the building.
    Type: Application
    Filed: November 29, 2002
    Publication date: August 14, 2003
    Inventors: Chandra Sekhar, Kwok Wai Tham, David Kok Wai Cheong, Nyuk Hien Wong
  • Energy-efficient variable-air-volume (VAV) system with zonal ventilation control
    Publication number: 20030146289
    Abstract: A ventilation and air-conditioning system uses a first variable-air-volume system to cool and dehumidify fresh outside air and deliver it through a first duct to a mixing box located downstream. The system also uses a second variable-air-volume system to further cool and dehumidify recycled air and deliver it through a second duct to the mixing box where the fresh and recycled air are able to mix prior to ventilation into a room or office. The system uses a carbon dioxide sensor and a temperature sensor to provide feedback signals to a control system, which in turn regulates fan speeds and damper openings in order to provide optimal cooling and ventilation and to conserve energy when cooling and ventilation requirements are low.
    Type: Application
    Filed: November 29, 2002
    Publication date: August 7, 2003
    Inventors: Chandra Sekhar, Kwok Wai Tham, David Kok Wai Cheong, Nyuk Hien Wong