Patent
HVAC custom control system
Scott W. Moore,Terry L. Webb,Michael C. Brown +2 more
- 14 Jan 1999
72
TL;DR: In this article, a unitary volumetric air flow controller is connected to the supply fan motor and to the return fan motor, and the controller selectively applies a supply drive power signal to the fan motor to energize the fan.
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Abstract: A fan control system suitable for use in air moving applications has a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure. A supply air flow sensor is responsive to an air flow in a supply air duct and supplies a supply air flow signal representative of the air flow in the supply air duct. A return air flow sensor is responsive to an air flow in a return air duct and supplies a return air flow signal representative of the air flow in the return air duct. A supply fan moves air in the supply air duct. The supply fan is driven by a supply fan motor. A return fan moves air in the return air duct. The return fan is driven by a return fan motor. A unitary volumetric air flow controller is connected to the supply fan motor and to the return fan motor. The air flow controller selectively applies a supply drive power signal to the supply fan motor to energize the supply fan motor, and selectively applies a return drive signal to the return fan motor to energize the return fan motor. The power drive signals are responsive to the static pressure signal, supply air flow signal, and return air flow signal.
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Citations
Patent
Methods and apparatuses for controlling air to a building
Joseph E. Finkam,Eric M. Pratt +1 more
- 05 Mar 2007
TL;DR: In this paper, apparatuses for controlling the volumetric airflow moving through at least one HVAC system component using a measurement device, for example an airflow detector, a regulator, and a controller.
158
Patent
Optimized control system for cooling systems
Scot M. Duncan
- 18 Dec 2007
TL;DR: A cooling system for providing conditioned air to a facility includes a chiller or other cooling subsystem, a cooling tower subsystem and one or more air handling units or process cooling units as mentioned in this paper.
112
Patent
Embedded heat exchanger for heating, ventilation, and air conditioning (hvac) systems and methods
John Chris Karamanos
- 10 Jan 2008
TL;DR: A zone control unit for use in a heating, ventilation, and air conditioning (HVAC) system is described in this paper. But the authors do not discuss the role of an ancillary component coupled with the heat exchanger.
65
Patent
Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems
Clifford Conrad Federspiel
- 23 Sep 2002
TL;DR: In this article, a control strategy for supply fans in variable-air volume heating, ventilating, and air-conditioning systems that reduces the static pressure at part-load conditions is presented.
55
Patent
Ventilation airflow rate control
Jie Chen,Aaron D. Herzon,Allan J. Reifel,Yi Chen +3 more
- 06 Feb 2007
TL;DR: In this paper, the authors present a method to converge on the target airflow rate, often avoiding overshoot, by running a fan motor at a present speed, sample speed or torque, sample current of the fan motor or pressure within the ventilation system.
46
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Patent
Control system for controlling environmental conditions in a closed building or other conditions
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TL;DR: In this paper, a highly distributed direct digital process control system for use in controlling a fully distributed process includes at least one device controller independently monitoring and controlling a plurality of external devices for performing a complete process.
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Variable volume multizone system
Donald C. Wellman,Clark William E +1 more
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TL;DR: In this paper, a zoned variable volume system is provided with a pair of non-connected dampers in each zone, and the fan speed is adjusted to cause at least one damper to be fully open so that the system operates at a minimum static pressure.
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Patent
Method and system for controlling a single zone HVAC supplying multiple zones
Jeffrey L. Parker,Edward Parker +1 more
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TL;DR: An improved monitoring and control system for a heating, ventilating and air conditioning (HVAC) unit which provides zone control in plural zones in which each zone includes a thermostat which controls a damper for its zone.
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Method and apparatus for controlling ventilation rates and indoor air quality in an HVAC system
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96