Pressure dependent variable air volume control strategy
First Claim
1. A method of minimizing air flow disturbances in a multi-zone air conditioning system, comprising the steps of:
- setting an air flow rate for conditioned air supplied to a climate controlled zone to maintain a zone temperature at a zone setpoint;
measuring deviation from the zone setpoint at first and second sampling instants within a sampling period;
estimating a zone heat transfer rate at the second sampling instant based on the setpoint deviation; and
adjusting the air flow rate in response to the step of estimating a zone heat transfer rate to minimize zone air flow disturbances.
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Accused Products
Abstract
A control strategy for rejecting supply air temperature disturbances in variable air volume air conditioning units using staged DX cooling. The strategy, and corresponding system, minimizes supply air temperature disturbances by controlling zone air dampers through a mapping of zone heat transfer requirements and damper positions. The mapping maintains a zone temperature setpoint, even with relatively large temperature swings caused by system-supplied conditioned air. The primary parameter that is controlled by the strategy of the present invention is a heat transfer rate associated with a temperature-controlled zone. The control strategy of the present invention estimates the zone heat transfer rate at a particular sampling instant and controls the damper position in response thereto.
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Citations
15 Claims
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1. A method of minimizing air flow disturbances in a multi-zone air conditioning system, comprising the steps of:
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setting an air flow rate for conditioned air supplied to a climate controlled zone to maintain a zone temperature at a zone setpoint; measuring deviation from the zone setpoint at first and second sampling instants within a sampling period; estimating a zone heat transfer rate at the second sampling instant based on the setpoint deviation; and adjusting the air flow rate in response to the step of estimating a zone heat transfer rate to minimize zone air flow disturbances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An air conditioning unit, comprising:
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an air conditioner; a regulator coupled to the air conditioner that regulates the amount of conditioned air introduced into a zone; a controller operatively connected to both the air conditioner and the regulator that is programmed to control operation of the air conditioner and the regulator; and a sensor operatively connected to the regulator and the controller via a closed feedback loop that senses the zone temperature and transmits a sensed zone temperature signal to the controller; the controller calculating an estimate of a zone heat transfer rate based on the sensed temperature and the zone temperature setpoint, and controlling operation of the regulator based on the estimated zone heat transfer rate to minimize supply air disturbances. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification