Patent ID: 8195335
Filing Date: 2012-06-05
Classification: F24F,Y02B

Abstract:
1. A method for controlling an economizer of an HVAC system, wherein the economizer is configured to provide an air stream to a cooling unit, the economizer having an outside air stream of incoming outside air, a return air stream of return air, and a mixed air stream of mixed incoming outside air and return air, wherein the mixed air stream is provided to the cooling unit of the HVAC system, the economizer further including one or more controllable dampers for controlling a mixing ratio of incoming outside air to return air in the mixed air stream, the method comprising: positioning the one or more controllable dampers such that the mixed air stream has a first mixing ratio of incoming outside air to return air in the mixed air stream; with the mixed air stream having the first mixing ratio, recording a first measure of the temperature of the mixed air stream; positioning the one or more controllable dampers such that the mixed air stream has a second mixing ratio of incoming outside air to return air in the mixed air stream, wherein the second mixing ratio is different from the first mixing ratio; with the mixed air stream having the second mixing ratio, recording a second measure of the temperature of the mixed air stream; based on the recorded first and second measures related to the temperature of the mixed air stream, determining whether and/or how much of the incoming outside air to admit into the economizer via the one or more controllable dampers during subsequent operation of the HVAC system.