Flow characteristics of an inclined air-curtain range hood in a draft

Abstract

The inclined air-curtain technology was applied to build an inclined air-curtain range hood. A draft generator was applied to affect the inclined air-curtain range hood in three directions: lateral (θ=0°), oblique (θ=45°), and front (θ=90°). The three suction flow rates provided by the inclined air-curtain range hood were 10.1, 10.9, and 12.6 m3/min. The laser-assisted flow visualization technique and the tracer-gas test method were used to investigate the performance of the range hood under the influence of a draft. The results show that the inclined air-curtain range hood has a strong ability to resist the negative effect of a front draft until the draft velocity is greater than 0.5 m/s. The oblique draft affected the containment ability of the inclined air-curtain range hood when the draft velocity was larger than 0.3 m/s. When the lateral draft effect was applied, the capture efficiency of the inclined air-curtain range hood decreased quickly in the draft velocity from 0.2 m/s to 0.3 m/s. However, the capture efficiencies of the inclined air-curtain range hood under the influence of the front draft were higher than those under the influence of the oblique draft from 0.3 m/s to 0.5 m/s.

Measurement of particle removal performance for a novel design of range hood

“…Local exhaust ventilation (range hood) is an effective method to capture contaminants in residential buildings. To improve the efficiency for capturing contaminants and provide healthier indoor air quality, some innovative technologies had been studied: Aaberg hood [6][7][8][9][10][11][12], separation plate technology [13][14][15], air curtain technology [16][17][18][19][20][21][22][23], tornado-like suction airflow technology [24,25], and make-up air technology [26][27][28][29]. Some optimizations of the range hood have been proposed: Shaping the outlet [30], changing the structure of the fan [31,32], and adjusting some influential factors (airflow rate, dimension, and burner * Corresponding author: fl@byg.dtu.dk position of the range hood) [33][34][35][36].…”