Whole house ventilation system
First Claim
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, andwherein the controller controls the damper to open the damper for the fresh air vent time during the next successive operating cycle.
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Accused Products
Abstract
A control system is disclosed for a house HVAC system including a thermostat, supply and return air plenums and an HVAC fan. The thermostat selectively controls the HVAC system to maintain the desired temperature and resulting in a variable operating cycle period between successive on times. A fresh air intake duct is between an exterior intake vent and the return air plenum. A stale air exhaust duct is between the return air plenum and an exterior exhaust vent. The control system comprises a controllable intake damper in the fresh air intake duct and a controllable exhaust damper in the stale air exhaust duct. A controller is operatively connected to the house HVAC fan and the controllable dampers. The controller predicts an upcoming cycle period for a next successive operating cycle and calculates a fresh air vent time.
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Citations
22 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A control system for a whole house ventilation system comprising an HVAC system including a fan, a thermostat, and supply and return air plenums, the thermostat selectively controlling the HVAC 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:
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a fresh air intake duct between an exterior intake vent and the return air plenum; a stale air exhaust duct between the return air plenum and an exterior exhaust vent; a controllable intake damper in the fresh air intake duct; a controllable exhaust damper in the stale air exhaust duct; and a controller operatively connected to the house HVAC fan and the controllable dampers, 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 dampers to open at least one of the dampers for the fresh air vent time during the next successive operating cycle. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification