| 摘要 |
Control systems for recovery wheels, ventilation systems with recovery de vices, buildings having ventilation, and methods of controlling recovery whe els and controlling or modifying ventilation systems. A parameter of ventila tion systems or recovery devices, such as the speed of a recovery wheel, may be controlled as a function of pressure, differential pressure, flow rate, or fan speed, for example, to provide appropriate purge flow to maintain pur ge effectiveness and limit the carry-over of contaminants from a return/exha ust airstream to an outside/supply airstream, for instance, in a variable ai r-volume system. A purge angle may be set at a minimum position commensurate with a maximum flow rate and recovery-wheel speed may be reduced at lower f lows to maintain purge effectiveness. In some embodiments, temperature and h umidity are measured, and wheel speed is also controlled as a function of th ese measurements. Systems may utilize sensors, input devices, digital contro llers, variable-speed drives, and alarms.
|
