Patent
Variable air volume building ventilation system
Robert B. Smith
- 17 May 1982
66
TL;DR: In this article, a variable air volume ventilation system is described in which the output air flow from a supply fan (13), delivered through a supply duct (11) to various places within a building, is returned by a return duct (15) through a return fan (17) and then through a connecting duct (18) back to the inlet (20) of the supply fan.
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Abstract: A variable air volume ventilation system (10) is disclosed in which the output air flow from a supply fan (13), delivered through a supply duct (11) to various places within a building, is returned by a return duct (15) through a return fan (17) and then through a connecting duct (18) back to the inlet (20) of the supply fan (13). The static pressure in the supply duct (11) is sensed by a static pressure sensor (40), and the output signal indicative of pressure is used by a variable frequency power supply (44) to provide power to drive the fan motors (36, 37) at a frequency inversely proportional to the difference between the sensed static pressure and a desired static pressure, thereby adjusting the flow through the ventilation system to match demand. Outside make-up air is provided through an outside air duct (50) and is fed into the return duct (15) at a position (52) near the inlet (16) of the return fan (17). The air flow through the outside air duct is controlled to a constant flow rate which matches the expected rate of exhaust air from the building so that the flow of air into and out of the building is balanced despite changes in the rate of flow through the ventilating system in response to demand.
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Citations
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References
Patent
Return air flow control for variable air volume system
Roger W. Haines,Mark A. Purinton +1 more
- 23 Feb 1982
TL;DR: A variable air volume (VAV) system in which the inflow of outside air is maintained above a predetermined value by maintaining a substantially fixed negative pressure in the plenum by the use of a static pressure sensor and control system for controlling the speed of the return fan is described in this paper.
50
Patent
Apparatus and method for controlling the speed of an induction motor in a closed-loop system
Denton C. Rowe
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TL;DR: In this paper, a method and control apparatus for maintaining a measured parameter of an environment in a closed-loop system within a range of the desired level for that parameter, to an accuracy greater than that of the parameter measuring device in the closedloop system.
46
Patent
Ventilating system and control therefor
Jerome L Lorenz
- 24 Jul 1969
TL;DR: In this article, dampers in the air inlet of a ventilation system for a relatively closed room or building are adjustably positioned by a reversible electric motor controlled so that although the velocity at which air is exhausted from the building may vary, the dampers regulate the inflow of air to provide a substantially constant pressure differential between the interior and exterior of the building.
24
Patent
Fluid flow regulating systems
Berthold A Knauth
- 29 Jan 1979
TL;DR: In this paper, a velocity head force sensor that responds to the velocity head forces of an air stream delivered by the pumping device is detected and used to control the power delivered to the motor.
23
Patent
Control of heating and ventilation systems
Anthony Robinson
- 06 Feb 1978
TL;DR: In this paper, a control system is provided which automatically varies the degree of ventilation of an indoor swimming pool in response to variations in the outside temperature and comprises separate speed-regulating means for each of the fan-driving motors.
16
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