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Self-balancing variable air volume heating and cooling system

  • US 5,535,814 A
  • Filed: 09/22/1995
  • Issued: 07/16/1996
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Term
First Claim
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1. A method of automatically air balancing in a variable air volume system having a primary air supply comprising the steps of:

  • providing a plurality of individual terminal units, each terminal unit located in a respective zone of a building and each terminal unit coupled to the primary air supply for controllably providing conditioned airflow into the corresponding zone of the building;

    in each terminal unit, establishing a respective local cooling threshold temperature;

    selecting a threshold load level of the primary air supply;

    communicating to all of the terminal units an indication of the primary air supply load level;

    in each terminal unit, determining a local zone temperature;

    in each terminal unit, comparing the local zone temperature to the corresponding cooling threshold temperature; and

    if said communicating step indicates that the primary air supply load level exceeds the threshold load level, in each terminal unit, reducing the terminal unit maximum airflow only if the corresponding local zone temperature is below the corresponding cooling threshold temperature, thereby rebalancing the cooling system such that zones having a local temperature below the local cooling threshold temperature are provided reduced airflow, thereby making increased airflow available to other zones in which the local temperatures exceed the local cooling threshold temperature.

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