Noise reduction method for air conditioner, blower and device, pressure pulsation reduction device for refrigeration cycle device, pressure pulsation reduction device for pump device, and pressure pulsation reduction method for device

摘要

Air conditioning equipment that ensures sufficient noise reduction in the low frequency range of a few hundred hertz or below. The air conditioning equipment is characterized by including a heat exchanger for exchanging heat between air and refrigerant of a refrigeration cycle, a fan that supplies air to the heat exchanger, an air duct in which the fan is installed and through which acoustic waves are propagated, and a plurality of small holes that blows a jet into the air duct and sucks a jet from the air duct by a pressure difference between the blow side and the suction side of the fan. IMAGE