Danny J Miller

US Patent:

8515584, Aug 20, 2013

Filed:

Aug 20, 2009

Appl. No.:

12/544960

Inventors:

Danny Miller - Renton WA, US
Justin Sipe - Federal Way WA, US

Assignee:

Transformative Wave Technologies LLC - Redmond WA

International Classification:

B01F 3/02
F24F 7/00
F24F 3/14
F24F 11/00
F24F 11/02
F24F 13/06
F25B 29/00
F25B 49/00
F25D 17/04
G05D 3/12
G05D 23/00

US Classification:

700276, 700295, 62126, 62186, 236 44 C, 236 44 R, 236 493, 454239, 454256, 454333

Abstract:

An energy-reducing method and apparatus for retrofitting a constant volume HVAC system, with or without an economizer, that provides heating, cooling, and ventilation to occupants within a building space. The present invention includes the introduction of a programmable logic controller and variable frequency drive (VFD) that takes control of the existing fan, heating, cooling, and optional economizer operation. The controller is programmed for the reduction of fan speed in the heating and cooling modes. The reduction of the fan speed in the ventilation mode when the 100% operation is not needed saves significant energy of the existing constant volume HVAC system where the fan motor is designed to run 100% of the time. The fan speed may be further reduced upon a reduction in sensed occupancy levels of the space, such as with a COsensor. Additionally, the fan speed may be reduced in the heating and/or cooling mode to further reduce energy consumption.