Air flow hood
An apparatus for measuring airflow through a diffuser of an HVAC system includes a hood for being positioned adjacent the diffuser so that airflow discharged from the diffuser is directed into the hood. The hood is configured to divide and direct the airflow through a plurality of discharge channels. Sensor probes measure the airflow through each discharge channel.
1. An apparatus for measuring airflow through a diffuser of an HVAC system, comprising:
a hood for being positioned adjacent the diffuser so that airflow discharged from the diffuser is directed into the hood, the hood being configured to divide and direct the airflow through a plurality of discharge channels; and
sensor probes for independently measuring the airflow through each discharge channel.
2. The apparatus recited in claim 1 , wherein the hood comprises flow disrupting structures for mixing and distributing the airflow evenly throughout the discharge channels.
3. The apparatus recited in claim 2 , wherein the flow disrupting structures comprise turbulators.
4. The apparatus recited in claim 2 , wherein each flow disrupting structure comprises a plurality of tooth-shaped fins arranged in saw tooth-like rows.
5. The apparatus recited in claim 2 , wherein the flow disrupting structures are positioned adjacent inlets of the discharge channels.
6. The apparatus recited in claim 1 , wherein the hood comprises internal walls that divide the airflow and funnel the airflow into the discharge channels.
7. The apparatus recited in claim 6 , wherein the internal walls have a peaked configuration and slope in a converging manner toward the discharge channels.
8. The apparatus recited in claim 6 , wherein the hood comprises an upper portion that defines an open space into which airflow is discharged, the internal walls and the discharge channels being positioned downstream of the upper portion.
9. The apparatus recited in claim 1 , wherein the hood comprises four quadrants through which the divided airflow is directed, each quadrant including one of the discharge channels, the hood further comprising internal walls that help define the quadrants and that divide the airflow in the hood and funnel the airflow into the discharge channels.
10. The apparatus recited in claim 9 , wherein each quadrant comprises at least one flow disrupting structure for mixing and distributing the airflow evenly throughout the discharge channels.
11. The apparatus recited in claim 10 , wherein the flow disrupting structures are positioned adjacent inlets of the discharge channels.
12. The apparatus recited in claim 1 , further comprising a planar surface, positioned in an upper portion of the hood, which streamlines and directs the airflow toward the discharge channels.
13. The apparatus recited in claim 12 , wherein the planar surface reduces the volume of the upper portion and thereby helps prevent swirling in the airflow in the upper portion of the hood.
14. The apparatus recited in claim 12 , wherein the planar surface is an upper portion of a cover under which instrumentation and electronics are located.
15. The apparatus recited in claim 14 , wherein the instrumentation comprises at least one of pressure and temperature transducers.
16. The apparatus recited in claim 1 , further comprising:
electronics for interrogating the sensor probes and transmitting wireless signals comprising measurement data obtained via the sensor probes; and
a smart device for receiving the wireless signals and processing the measurement data to provide airflow measurement data for the diffuser.
17. The apparatus recited in claim 16 , wherein the smart device comprises one of a smart phone or tablet equipped with an application for processing the airflow measurement data and comprising a graphical user interface for displaying information related to the measurement data and the HVAC system.
18. The apparatus recited in claim 1 , further comprising a pole mounting structure located centrally on an underside of the hood, the pole mounting structure being adapted to receive a pole that a user can manipulate to maneuver the hood to a desired position adjacent the diffuser.
19. The apparatus recited in claim 18 , wherein the pole mounting structure comprises a swivel mechanism for permitting the pole to pivot relative to the hood.
20. The apparatus recited in claim 18 , wherein the pole has a telescoping construction that permits the length of the pole to be adjusted in order to facilitate positioning the hood adjacent the diffuser while positioning a base of the pole against a surface so that the surface supports at least a portion of the weight of the hood.
21. The apparatus recited in claim 20 , wherein the pole comprises a handle that the user can grasp to maneuver the hood, the handle comprising a trigger actuatable via finger to provide a wireless signal for activating system electronics.
22. The apparatus recited in claim 1 , wherein the sensor probes comprise hot point anemometer sensors.
23. A method for measuring airflow through a diffuser of an HVAC system, comprising:
gathering the airflow discharged from the diffuser;
dividing the airflow;
directing the divided airflow through a plurality of discharge channels; and
independently measuring the airflow through each discharge channel.
24. The method recited in claim 23 , further comprising disrupting the airflow to mix and distributing the airflow evenly throughout the discharge channels.
25. The method recited in claim 23 , further comprising streamlining the airflow in the region close to the diffuser and directing the airflow toward structure for dividing the airflow.