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You B.,Huazhong University of Science and Technology | You B.,Guangdong Midea Holding Co. | Tian M.-L.,Guangdong Midea Holding Co. | Wu Y.-D.,Guangdong Midea Holding Co. | And 3 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2011

The outdoor units of the Variable Refrigerant Flow air conditioning system manufactured by the top brands of the world are all using double-fan system. However, they generate varying degrees of pulsation noise, with the low frequency features making it easy for people to feel dysphasia. When the double fans operate at nearly the same Blade Passing-by Frequency, noise of beating vibration will be generated. Its frequency is equal to the difference of the blade passing-by frequency of the double fans. Rotated noise is the main source of beating vibration energy. This paper designs a new fan with 3-blades. The acoustic noise and the internal flow field characteristics of the newly designed 3-blades fan and the original 4-blades fan are analyzed. The results showed that it could eliminate the beating vibration noise by using one 3-blades fan and one 4-blades fan in the VRF air conditioning outdoor system. The volume flow and the refrigerant characteristic of the VRF also improved. Source


You B.,Huazhong University of Science and Technology | You B.,Guangdong Midea Holding Co. | Liu D.-Y.,Wuhan University | Wu G.-H.,Guangdong Midea Holding Co. | And 3 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2010

In order to reduce the vibration generated from the low blade pressure axial fan, to improve the quantity of sound and to decrease the noise and motor capacity, a new axial fan with the concaved trailing edge has been designed. These blades have been entirely thinned-out; however, part of the leading-edge has been thickened. In this paper, The Navier-Stoker formula analogizing 3D data was used to compare the newly designed fan and the existing fan whose internal flow charters and air-actuated features. Presenting the flow pressure analysis of the two fan performance curves and noise spectrums, this indicates that the concaved end design and thinned-out blades could lighten the fan weight and reduce the motor electrical load, as well as weaken the rotor wake. The thickening design solution of the blade fore-edge could reduce the apex vibration and reduce the noise peak value of the blades rotating frequency to realize the noise reduction and noise quality improvement. Source

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