Research on Noise Reduction Scheme of Heat Pump Unit in a Square

Abstract

Heat pump unit is a host device located in the central air-conditioning terminal, providing cold and hot water. Heat pump unit has the advantages of energy saving, environmental protection, easy maintenance, and so on. It is adopted to solve the problems of refrigeration and heating in ventilation and air conditioning from many engineering projects in China. When the equipment is turned on, however, the high noise generated by the heat pump unit has a very negative impact on the life and work of the surrounding residents. Therefore, noise reduction is needed to improve the environment quality. In this paper, the noise of the air-cooled heat pump unit of the square area in Shanghai was detected, the noise source was analyzed, and the corresponding noise reduction scheme was proposed. After the completion of the scheme, measurements indicate that A-weighted sound pressure level is less than or equal to 60 dB (A) during the day and less than or equal to 50 dB (A) at night, which meets the relevant national noise limit emission standards and conforms to the second-class quality standard of the acoustic environment.

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“…Rendering of the building design [6] Figure 1b. cross-section of the building design concept Other works [7 -10] show, that sound emissions by air source heat pumps (ASHP) prove to be unacceptable in most urban situations or must be remedied with substantial effort [9]. Ground source heat pumps (GSHP) are also difficult or impossible to deploy due to lack of space for geothermal bore holes or shallow collectors.…”