Airflow measuring assembly for air handling systems

An airflow measuring assembly for an air handling system comprising:

• a) a plate assembly having at least one plate structure and a specified configuration and being constructed and arranged to be installed in an air handling system;
• b) at least one aperture through said plate structure, said at least one aperture being constructed and arranged through said plate structure to direct airflow through said plate assembly;
• and
• c) means to measure airflow through said at least one aperture, said means to measure airflow being comprised of a first airflow sensor positioned in each said at least one aperture of said plate structure, said first airflow sensors being interconnected to provide an averaged total pressure reading, a second air pressure sensor for measuring static pressure and having means to provide an averaged static pressure reading, and means to provide the pressure differential between said averaged total pressure and said averaged static pressure.

A method for measuring airflow in an air handling system having a slot therein comprising:

• a) inserting an airflow measuring assembly in the slot of the air handling system, said airflow measuring assembly comprising:
• 1. an impervious structure with at least one opening of a predetermined configuration, said structure for placement in the air handling system to condition and direct airflow therethrough at a specified position in the fluid stream of the air handling system;
• and
• 2. means to measure airflow through said at least one opening of said impervious structure, said means to measure airflow comprising a static pressure measuring structure and a total pressure measuring structure, said means to measure being constructed and arranged to provide static and total pressure signals, respectively;
• and
• b) measuring volumetric airflow through said at least one opening of said impervious structure of said airflow measuring assembly by determining the pressure differential between said static and total pressure signals from said static and total pressure measuring structures.

An airflow measuring assembly for installation in an air handling apparatus air filter slot having specified dimensions, comprising:

• a) a plate assembly;
• b) said plate assembly having a plurality of apertures therein, said apertures being arranged in a predetermined pattern to direct airflow through said plate assembly and to simulate the resistance of an air filter;
• and
• c) means to measure the volumetric airflow through said apertures in said plate assembly, said means to measure the volumetric airflow having a means to provide and measure a total pressure signal and a means to provide and measure a static pressure signal, said means to provide total pressure signal being positioned behind said plate assembly and having a plurality of front-facing air pressure apertures positioned at generally the center of each said plurality of apertures in said plate assembly and said means to provide static pressure being positioned behind said plate assembly and having a plurality of rear facing air pressure apertures.

An airflow measuring assembly for insertion into the filter slot of an HVAC system, said assembly comprising:

• a) a plate structure having a plurality of openings and being constructed and arranged for placement into the filter slot of the HVAC system, said plate structure and said openings therethrough being constructed and arranged to simulate the airflow resistance of a slot filter;
• b) airflow measuring sensing means disposed in each said opening of said plate structure;
• and
• c) means to provide a total airflow signal from said airflow measuring sensing means.