Method and apparatus for ventilation measurement via carbon diox

Details Method and apparatus for ventilation measurement via carbon diox Method and apparatus for ventilation measurement via carbon diox

1992-02-14

1993-12-07

Joyce, Harold

Ventilation

Having forced recirculation

Including automatic control means

454370, 7386104, F24F 1100

Patent

active

052678970

ABSTRACT:
An apparatus and method indirectly determines the amount of outside air introduced into the ventilation system of a structure. Carbon dioxide concentrations are measured for return air, outside air and mixed air. The flow rate of mixed air is measured. The volume of outside air introduced into the system is determined without directly measuring the volume or flow rate of outside air. 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), Ahderfeon 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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