Air-cooled Heat Pump Noise Reducing Analysis And Research

As the air-cooled heat pump is more convenient in operation, management and maintenance, and has the dual function of refrigeration and heat advantages, therefore making it more widely applied to engineering projects. However, the heat pump's noise easy to impact on the environment, has become a recent general fixed source noise pollution in the city. This requires manufacturers to take measures for noise reduction control unit in order to improve the unit's noise performance, ultimately to improve and eliminate air-conditioning industry to the negative effect of the urban environment.Heat Pump noise control of the main ways:Heat Pump noise control and cooling tower noise control are similar to mainly use silencer, sound insulation, vibration isolation to control fans, compressors, pumps and other sound source. The subject according to the structural characteristics of air-cooled heat pump unit, noise characteristics and mode of transmission, air-cooled heat pump units for the noise source, such as the upper part of the axial fan unit, the lower part of the compressor unit theoretical analysis and experimental study. The fan noise on the causes one by one analysis, research using forward-swept wing fan-type, indicating the extent of its forward-swept greater impact on the noise, increasing the degree of forward-swept height of vortex shedding can be reduced, with use of noise reduction, and select the application non-metallic impeller, also contributed to the noise. In the air conditioning compressor, the use of acoustic enclosures for noise reduction measures to increase on the acoustic cover of the technical requirements analysis and research, while the application of acoustical enclosures experiments, the final show, after an increase of acoustic enclosures, machine Noise down 1.8 dB, but its effect is less than replacement rate of fan noise reduction obtained, showing that the machine stroke system noise is dominant.According to the main unit of the characteristics of noise sources, through which the system research and experimentation, effectively reducing the machine noise.