| 主权项 |
1. A control system for a whole house ventilation system comprising a house air handling system including a fan, a thermostat, and supply and return air plenums, the thermostat selectively controlling the air handling system to maintain desired temperature and resulting in a variable HVAC operating cycle period between successive on times of the fan, where a fresh air vent time is an adaptable duration value, the control system comprising:
an air exchange duct between one of the plenums and an exterior vent; a controllable damper in the air exchange duct; and a controller operatively connected to the house air handling system fan and the controllable damper, the controller storing a desired fresh air exchange rate, wherein the controller predicts duration of the next operating cycle period based on the duration of the previous operating cycle, wherein the operating cycle period is defined as ranging from on to off and back on again, wherein the value for the predicted duration of the next operating cycle period is calculated and recorded, wherein this recorded value for the predicted duration of the next operating cycle period is used as part of a formula to determine length of the fresh air vent time for the next successive operating cycle using the fresh air exchange rate, and wherein the controller controls the damper to open the damper for the fresh air vent time during the next successive operating cycle. |
