초록 ▼

Control systems for recovery wheels, ventilation systems with recovery devices, buildings having ventilation, and methods of controlling recovery wheels and controlling or modifying ventilation systems. A parameter of ventilation systems or recovery devices, such as the speed of a recovery wheel, ma

Control systems for recovery wheels, ventilation systems with recovery devices, buildings having ventilation, and methods of controlling recovery wheels and controlling or modifying ventilation systems. A parameter of ventilation 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 purge effectiveness and limit the carry-over of contaminants from a return/exhaust airstream to an outside/supply airstream, for instance, in a variable air-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 flows to maintain purge effectiveness. In some embodiments, temperature and humidity are measured, and wheel speed is also controlled as a function of these measurements. Systems may utilize sensors, input devices, digital controllers, variable-speed drives, and alarms.

대표청구항 ▼

What is claimed is: 1. A method of controlling a recovery wheel in a variable air-volume ventilation system to reduce energy consumption and simultaneously limit the carry-over of exhaust air contaminants into a supply airstream, the method comprising at least the steps of:setting an initial fixed p

What is claimed is: 1. A method of controlling a recovery wheel in a variable air-volume ventilation system to reduce energy consumption and simultaneously limit the carry-over of exhaust air contaminants into a supply airstream, the method comprising at least the steps of:setting an initial fixed purge angle of the recovery wheel for a high-flow condition of the variable air-volume ventilation system; automatically varying at least one airflow rate within the ventilation system based on a need for ventilation wherein the at least one airflow rate passes through the recovery wheel; and using an automated process, modulating rotational speed of the recovery wheel as a function of at least one of a pressure, a pressure differential, a flow rate, or a fan speed, within the ventilation system; wherein the step of modulating rotational speed of the recovery wheel includes repeatedly changing the rotational speed, and reducing the wheel speed for flow conditions having airflow rates lower than the high-flow condition; and wherein the step of modulating rotational speed of the recovery wheel further includes providing adequate purge flow to limit the carry-over of exhaust air contaminants into the supply airstream to meet an applicable contaminant carryover standard, while avoiding having more than twice the purge flow needed to meet the applicable contaminant carryover standard.