AXIAL IMPELLERS HW Ventilation Headquartered near Milan, Italy, HW ventilation is a leading manufacturer of axial impellers and ventilators for industrial applications. With our extensive experience in the market, we are an extremely dynamic company committed to continuously provide our customers with innovative products and services 100% made in Italy. The undisputed success of HW Ventilation in the industry we serve is the result of our clear corporate philosophy and mission. 70% of the company’s revenue comes from worldwide export through selected distributors and agents. Qualyfan selection...

AXIAL IMPELLERS The phases of Q-blade project: from concept to shelf ▲ ▲ Scope of the project: • produce an efficient axial impeller made of Polypropylene/Polyamide, ideal for large scale productions • guarantee higher efficiency and lower noise emission at high rpm Target applications: compressors, heat-exchangers, radiators, HVAC/R, ventilators, generators… The phases of Q-blade project: From the industrial idea to the prototypes ▲ Concept: borrow the best from each product of the HW Ventilation family – reliability and easiness-to-assemble from TS series, low noise and efficiency from SR/C...

AXIAL IMPELLERS The phases of Q-blade project: From the industrial idea to the prototypes ▲ Material analysis: mechanical, thermal, flammability and other properties Performance simulations and analysis of pressures: Prototyping and performance testing at our AMCA 210-07 wind tunnel Design, filling simulations and actual construction of the mold tools Mass Production HW VENTILATION S.r.l. I viale dei Kennedy, 81/83 I 20027 Rescaldina (MI) ITALY I T +39 0331 1558 815 I F +39 0331 1225 767 I E [email protected] I W hwventila

AXIAL IMPELLERS Intro: The launch of Q family has represented the attempt to widen HW Ventilation product portfolio, through a new blade able to guarantee improved performances in terms of airflow and pressures, compared to the classic airfoil profile D blade. Another important driver of the project is the reduction of noise. The study of the new blade has been impacted by the applications for which the new blade has mainly been conceived, that is radiators and heat exchangers. Figure 1: airfoil profile D blade (tapered) Figure 2: sickle profile Q blade (wider tip) Improved air flow / pressures:...

AXIAL IMPELLERS Comparison between the performances of two fans with the same characteristics: • Same configuration: 8-8 • Same setting angle: 35° • Same diameter: 500 mm • Same rpm: 1500 Fan 1. employs classic fixed pitch D blades, while fan 2. employs the new sickle-profile fixed pitch Q blades. The new Q-bladed fan shows better performances in terms of airflow and pressure, and offers good levels of efficiency. At any given value of the airflow, pressures originated by the Q-bladed fan are much higher (+40/50%). As a consequence, the stall region is delayed. Lower noise emissions: Comparison...

AXIAL IMPELLERS Performance analysis Lptot - Total sound pressure level [dB (A)] 80 [dB (A)] 78 76 74 72 70 68 66 2 64 The noise measurement at 1 meter from the two fans reveal that the new Q-bladed fan has better noise emissions: more than 2 dB[A] less than the D-bladed fan. HW VENTILATION S.r.l. I viale dei Kennedy, 81/83 I 20027 Rescaldina (MI) ITALY I T +39 0331 1558 815 I F +39 0331 1225 767 I E [email protected] I W hwventilation.it

HW VENTILATION S.r.l. Viale dei Kennedy 81/83 20027 Rescaldina (MI) – ITALY