Variable air volume air conditioning system

Details Variable air volume air conditioning system Variable air volume air conditioning system

1976-04-23

1978-05-02

Wayner, William E.

Refrigeration

Automatic control

Of external fluid or means

98 15, 165 16, 236 49, 417279, F24F 1104, F24F 706

Patent

active

040867811

ABSTRACT:
A variable air volume air conditioning system is provided with thermostat controlled variable air volume terminal boxes for controlling the volume of constant temperature conditioned air provided to each space to be conditioned. The conditioned air is delivered through a short pressure recovery duct to a trunk duct by a centrifugal fan having forward curved blades. The trunk duct pressure is maintained substantially constant by control vanes disposed at the recovery duct outlet, said control vanes being responsive to an increase in duct pressure to close the duct outlet and unload the fan, thereby reducing the energy consumed by the fan. Economizer operation is provided by the use of return air dampers and outside air dampers controlled in response to outside air temperature and air supply duct temperature to mix outside air and return air to reduce the amount of mechanical refrigeration required. A power air return means is provided for returning air to the system from the spaces that are conditioned and for controlling the amount of return air in accordance with the volume of air delivered to the conditioned spaces.

REFERENCES:
patent: 2813235 (1957-11-01), Clay
Control Systems for HVAC, Roger W. Haines, pp. 119 & 120 Van Nostrand Reinhold Co., 1971.
Air Conditioning & Ventilation of Buildings Brian M. Roberts, Pergamon Press, 1975, pp. 217 & 218.

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