Flow Characteristics and Robustness of an Inclined Quad-vortex Range Hood

Abstract

A novel design of range hood, which was termed the inclined quad-vortex (IQV) range hood, was examined for its flow and containment leakage characteristics under the influence of a plate sweeping across the hood face. A flow visualization technique was used to unveil the flow behavior. Three characteristic flow modes were observed: convex, straight, and concave modes. A tracer gas detection method using sulfur hexafluoride (SF6) was employed to measure the containment leakage levels. The results were compared with the test data reported previously in the literature for a conventional range hood and an inclined air curtain (IAC) range hood. The leakage SF6 concentration of the IQV range hood under the influence of the plate sweeping was 0.039 ppm at a suction flow rate of 9.4 m3/min. The leakage concentration of the conventional range hood was 0.768 ppm at a suction flow rate of 15.0 m3/min. For the IAC range hood, the leakage concentration was 0.326 ppm at a suction flow rate of 10.9 m3/min. The IQV range hood presented a significantly lower leakage level at a smaller suction flow rate than the conventional and IAC range hoods due to its aerodynamic design for flow behavior.

Indoor thermal environment and air quality in Chinese‐style residential kitchens

“…Their results showed that adding side plates improved the capture efficiency by 20%. Meanwhile, Huang et al installed two side plates at the lateral ends of a hood to increase containment removal efficiency and reduce energy consumption. The relative leakage of contaminant from the hood into the occupied zone became virtually non‐existent.…”

“…Their results showed that adding side plates improved the capture efficiency by 20%. Meanwhile, Huang et al 60,61…”

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].…”