초록

A variable air volume (VAV) system in which the inflow of outside air is maintained above a predetermined value by maintaining a substantially fixed negative pressure in the plenum by the use of a static pressure sensor and control system for controlling the speed of the return fan.

대표청구항 ▼

A variable air volume conditioning system for maintaining the inflow of outside air above a predetermined rate regardless of the volume of the air being supplied to a conditioned space, said system comprising: a. a duct system including a supply duct for delivering supply air to a conditioned space

A variable air volume conditioning system for maintaining the inflow of outside air above a predetermined rate regardless of the volume of the air being supplied to a conditioned space, said system comprising: a. a duct system including a supply duct for delivering supply air to a conditioned space and a return duct for returning a portion of the air supplied to said conditioned space; b. a plenum chamber in said duct system, said chamber having an outside air inlet, a return air inlet, and an outlet communicating with said supply duct; c. air conditioning means for attempering the stream of mixed outside air and return air downstream from said plenum chamber; d. a supply air fan associated with said supply duct; e. a return air fan associated with said return duct; and f. means, interconnected between said plenum chamber and said return air fan, for sensing the static pressure in said plenum chamber and for controlling the speed of the return air fan so as to maintain the plenum chamber pressure at a substantially constant negative level relative to a fixed reference level.