Energy saving in Heater, Ventilator, Air Conditioner (HVAC) is increasingly critical to reducing automobile fuel consumption To improve the thermal performance of condensers, the air flow must be increased for cooling system. Reducing motor power input by improving fan efficiency and fan noise are indispensable. A new fan having large forward-skewed blades and using a low-noise airfoil for the hub was developed, its noise level was 4 dB (A) lower than that of the current fan. Tip fins, which suppress tip vortex generation, were determined by air flow analysis, and the effect in reducing noise was 1-2 dB (A). The new blade shape and tip fins are expected to reduce noise 5 to 6 dB (A).
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