Patent ID: 9360228
Filing Date: 2016-06-07
CPC Classification: F24F,Y10T

Claim Text:
1. A system to control ventilation of air in an enclosed area, comprising: a ventilation device; a first sensor adapted to detect the presence of moisture vapor in the air in the enclosed area; a second sensor structured to detect air temperature in the enclosed area; and a circuit coupled to the ventilation device and to the first and second sensors and structured to determine a dew point value in the enclosed area and to control ventilation of the air in the enclosed area in response to the determination of the dew point value based on outputs of the first and second sensors, the circuit comprising a control circuit structured to activate the ventilation device in response to the determination of the dew point value, the control circuit structured to determine the dew point value in accordance with the following calculation: the control circuit further structured to activate the ventilation device when the dew point value is at or above a threshold count of 128 and to activate the ventilation device in one from among a plurality of modes of operation, comprising a first mode in which the control circuit is structured to activate the ventilation device in response to determination of the dew point value based on outputs of the first and second sensors, a second mode in which the control circuit is structured to activate the ventilation device based on the sensed amount of moisture vapor in the enclosed area over a threshold amount of moisture in the enclosed area, and a third mode in which the control circuit is structured to determine a rate of change of the sensed moisture over a period of time in the enclosed area and to activate the ventilation device when the rate of change over the period of time exceeds a threshold rate of change over the period of time.