ABSTRACT
In Heating, Ventilating, and Air Conditioning (HVAC), mechanical systems are typically designed to perform heating, cooling, and ventilation of spaces requiring such types of environmental control. A ducted exhaust fan, that is manually turned on and off, is an example of a simple mechanical system. The system is composed of the fan, and the associated distribution ductwork required to convey the air, from the space being exhausted, to the outdoors. The mechanical means of connecting together all of the equipment, in some meaningful manner, is the hot water piping. With the operation of the mechanical system described as such, the control systems designer has a clear direction to follow, and can design his or her control system in accordance with the sequence.
