Patent
Ventilation airflow rate control
Jie Chen,Aaron D. Herzon,Allan J. Reifel,Yi Chen +3 more
- 06 Feb 2007
46
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.
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Abstract: Airflow rates within a ventilation system are controlled using motor speed or torque and motor electric current or pressure. Fan speed or torque may be varied to compensate for differing restriction in ductwork, and may provide a constant airflow rate over a range of varying airflow restriction. Air handlers or air conditioning units may be mass produced in common configurations, and installed in different buildings or structures with different ductwork configurations. Methods operate a fan motor at a present speed or torque, sample speed or torque, sample current of the fan motor or pressure within the ventilation system, calculate a present airflow rate within the ventilation system, calculate a new input setting using the present airflow rate and a target airflow rate, change the speed or torque to the new input setting, and repeat these steps to converge on the target airflow rate, often avoiding overshoot.
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Citations
Patent
Blower motor for HVAC systems
Arthur E. Woodward
- 08 Sep 2008
TL;DR: In this article, a blower motor assembly with a variable speed PSC motor is described, which is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system.
45
Patent
Constant airflow control of a ventilation system
Young Chun Jeung,Jin Ho Jung +1 more
- 01 Apr 2009
TL;DR: In this paper, a ventilation system for providing a substantially constant airflow is described, which includes a duct, a fan, an electric current detector, a motor speed detector, and a controller to determine in which speed range among a plurality of speed ranges the speed of the motor is, based at least partly on the speed feedback signal.
39
Patent
Outside plant telecommunications cabinet direct air cooling system
Mark Hendrix,Alan James Skrepcinski +1 more
- 27 Mar 2008
TL;DR: An outdoor equipment cabinet includes a housing with an equipment compartment therein An intake air vent and an exit air vent are formed in the housing, and a fan is mounted within the housing for pulling air into the intake and pushing air out of the exit.
36
Patent
Multi-level programming of motor for a ventilation system
Young-Chun Jeung
- 18 Jan 2008
TL;DR: In this article, a method of constant airflow control for a ventilation system is disclosed, which includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct.
34
Patent
Hvac control using discrete-speed thermostats and run times
Jie Chen,Allan J. Reifel,Dave L. Koesterer,Siegfried J. Weigl +3 more
- 27 Jul 2010
TL;DR: In this article, the authors proposed a method of controlling air conditioning and HVAC units using a thermostat for a discrete-speed unit that include changing speed based on how long the unit operates at a particular speed.
29
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257
Patent
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Patent
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215
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