CHARACTERIZATION OF AIRFLOWS NEAR THE EXIT OF HVAC REGISTERS USING LASER DOPPLER VELOCIMETRY (LDV).

TUTU,N.K. ; KRISHNA,C.R. ; ANDREWS,J.W. ; BUTCHER,T.A.

Brookhaven National Laboratory

关键词: Blowers;    Boundary Conditions;    Laser Doppler Anemometers;    Flow Rate;    Temperature Distribution;   

DOI  :  10.2172/809913
RP-ID  :  BNL--71102-2003-IR
RP-ID  :  AC02-98CH10886
RP-ID  :  809913

美国|英语

来源: UNT Digital Library

【 摘 要 】

A facility to characterize the airflow at the exit of HVAC registers was designed and fabricated. The objective of this work is to obtain velocity and turbulence data at the exit of registers, which can then be used as an input boundary condition in a modern Computational Fluid Dynamics (CFD) code to predict the velocity and temperature distribution in an enclosure, and also the register performance parameters such as throw. During the course of this work, two commonly used registers were tested. Both registers were 8 inch x 4 inch sidewall registers. Laser Doppler Velocimetry was used to measure the axial and vertical components of the velocity vector at various locations across the face of the registers. For the two cases of registers studied here, the results suggest that the velocity field at the very exit of each of these registers scales with the flow rate through the registers. This means that, in the mode of operation in which the supply fan (of an HVAC system) has a ''High'' and ''Low'' setting, similar velocity scaling would result for the type of registers tested here.