Method and apparatus for controlling ventilation rates and indoo

Details Method and apparatus for controlling ventilation rates and indoo Method and apparatus for controlling ventilation rates and indoo

1992-10-15

1994-03-08

Joyce, Harold

Ventilation

Having forced recirculation

Including automatic control means

454370, 7386104, F24F 1100

Patent

active

052922804

ABSTRACT:
An apparatus and method indirectly determines the amount of outside air introduced into the ventilation system of a structure to control the indoor air quality in the structure. Test gas concentrations, preferably carbon dioxide concentrations, are measured for return air, outside air and mixed (supply) air. The flow rate of mixed air is measured. The volume of outside air introduced into the system is determined through use of the test gas concentration measurements without directly measuring the volume or flow rate of outside air. Preferably, a single sensor is utilized to measure each of the trace gas concentrations in the return air, outside air and supply air, and the various measurements sequentially multiplexed to a controller. Moreover, for calibrating the apparatus, a return air sensor is calibrated to the outside air and a mixed air sensor is calibrated to the outside air or the return air to eliminate inaccuracy due to sensor drift.

REFERENCES:
patent: 3369405 (1968-02-01), Galegar
patent: 4051731 (1977-10-01), Bohl et al.
patent: 4090392 (1978-05-01), Smith et al.
patent: 4164172 (1979-08-01), Anderten et al.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE).
ASHRAE Standard 62-1989 entitled "Ventilation for Acceptable Indoor Air Quality".

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