Abstract
In mixing ventilation systems, diffusers are often located on side walls and supply quasi-free air jets above the occupied zone. The data presented in this paper shows a new CFD 3D benchmark with two well-defined characteristic zones in the room, i.e., the quasi-free jet zone and the occupied zone. Measurement methods adequate for air velocity and speed measurement were applied: laser Doppler anemometry for the axial velocity component in the jet and low velocity thermal anemometry for the air speed in the occupied zone. Measurements were performed in a physical scale model (1:5) of the room. The kinematic similarity criterion was fulfilled by the equality of the Reynolds numbers in the model and in the prototype. To identify boundary conditions, additional measurements were carried out in the inlet region (as close as possible to the supply opening). The CFD results validation and reporting methods applicable for the benchmark data are proposed in Hurnik et al. (2015) [1].
Highlights
The data presented in this paper shows a new CFD 3D benchmark with two well-defined characteristic zones in the room, i.e., the quasifree jet zone and the occupied zone
Measurement methods adequate for air velocity and speed measurement were applied: laser Doppler anemometry for the axial velocity component in the jet and low velocity thermal anemometry for the air speed in the occupied zone
Experimental factors Laser Doppler anemometer (LDA) and low velocity acquired thermal anemometer (LVTA) results recorded in the instruments were exported as text files and copied to
Summary
The measurements were carried out in isothermal conditions in a room with dimensions of. The measurements were carried out in a physical scale model (1:5) of the room. The kinematic similarity criterion was fulfilled by the equality of the Reynolds numbers in the model and the prototype, ReM 1⁄4ReP 1⁄445,300. This yielded five times higher velocity and 52 faster turbulent fluctuations in the scale model than in the prototype and, resulted in lower uncertainties of the air speed measurement in the occupied zone and lower uncertainties of the statistical estimators of the mean and standard deviation (uncertainties due to the limited averaging time). The measurements were performed in the 1:5 physical model, all of the results presented in the paper and attachments were recalculated for the prototype conditions
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