Energy reducing retrofit apparatus for a constant volume HVAC system
US9933178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2015 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Dec 10, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/90
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An energy-reducing method and apparatus for retrofitting a single zone, 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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.