Siemens Aktiengesellschaft

Siemens Industry, Inc.

Dmitriy Okunev

Lingyun Wang

Sanjeev Srivastava

Zhen Song

A method for operating an air handling unit of an HVAC system. The method includes opening an outside air flow control device to enable breathing air flow during a high outdoor air time period to a first zone having a first number of occupants and a second zone having a second number of occupants that is less than the first number of occupants. The outside air flow control device is then closed to enable conditioning air flow during a low outdoor air time period to the first and second zones. Further, a variable air volume (VAV) air flow control device provides desired amounts of breathing air to the first and second zones suitable for the first and second number of occupants, respectively. A VAV air temperature control device then provides conditioning air to the first and second zones having a suitable temperature for the first and second number of occupants.

Zonal demand control ventilation for a building

A method, apparatus and computer-readable medium for generating a graphical tree based on a hierarchical structure includes receiving a request to convert a first hierarchical structure into a first graphical tree. Each of a plurality of elements of the first hierarchical structure, and the relationships among the plurality of elements are identified. A first graphical tree is generated based on each of the plurality of elements and the relationships among the elements. The first graphical tree is then displayed. Additional graphical trees can be displayed simultaneously and associations between nodes of the different graphical trees can be designated.

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Lawrenceville, NJ, United States of America

Dmitriy Okunev