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Method and system for improving energy efficiency in an HVAC system

  • US 8,930,030 B2
  • Filed: 09/30/2011
  • Issued: 01/06/2015
  • Est. Priority Date: 09/30/2011
  • Status: Active Grant
First Claim
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1. A method performed by a zone controller for a zone of a building for improving energy efficiency in a heating, ventilation, and air conditioning (HVAC) system, comprising:

  • operating in a ventilation mode;

    monitoring a temperature of the zone;

    monitoring outside air conditions for the building;

    determining whether to switch from the ventilation mode to an economizing mode based on a first set point for the temperature of the zone and based on the outside air conditions, wherein the first set point is determined based on a second set point for the temperature different from the first set point; and

    determining whether to activate the HVAC system based on the temperature reaching the second set point when the outside air conditions are not favorable as compared to the temperature of the zone.

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