Air handling unit including control system that prevents outside air from entering the unit through an exhaust air damper
US5791408A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2140/40
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A control system for controlling an air handling unit. The control system links the position of an exhaust air damper and a recirculation air damper so as the exhaust air damper is opened, the recirculation air damper is closed the same amount, and vice versa. An outside air damper remains completely open at all times. The relative positions of the exhaust air damper and the recirculation air damper control the amount of outside air that is emitted into the air handling unit through the outside air damper. For each of the control states of heating with minimum outside air, cooling with outside air, mechanical cooling with maximum outside air, and mechanical cooling with minimum outside air, the outside air damper remains completely open, and the position of the exhaust air damper and the recirculation air damper are controlled based on a particular state. Sequencing strategies are employed for transitions between the control states that utilize these positions of the dampers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.