With the popularity of evaporative air cooler in the use of enterprises, many consumers reflect that the noise generated by evaporative air cooler is too loud, which has become a major problem facing the industry. Next, let’s take a look at the causes and solutions for the loud noise of evaporative air cooler.

　　1. Noise caused by other than evaporative air cooler.

　　 2. Noise caused by turbulence

　　 3. Noise is generated due to blade rotation

　　4. It resonates with the duct shell and generates noise

　　5. Noise will also be generated when the blade generates vortex

When we find out the source of evaporative air cooler noise, we can better control the noise. Next, XIKOO shares with you the evaporative air cooler noise solutions.

　　 1. If possible, reduce the speed of the evaporative air cooler appropriately. The rotating noise of an evaporative air cooler is proportional to the 10th power of the impeller’s circumferential speed, and the eddy current noise is proportional to the 6th (or 5th) power of the impeller’s circumferential speed, so reducing the speed can reduce the noise.

　　2. Pay attention to the transmission mode of the evaporative air cooler and the electric motor. The evaporative air cooler with direct drive has the least noise, followed by couplings, and the V-belt drive with no joints is slightly worse.

　　3. The operating point of the evaporative air cooler should be close to the highest efficiency point. The higher efficiency of the same type of evaporative air cooler, the lower the noise. In order to keep the operating point of the evaporative air cooler in the high efficiency zone of evaporative air cooler, the use of valves for operating conditions should be avoided as much as possible. If it is necessary to install a valve at the pressure outlet of the evaporative air cooler, the best position for it is 1m away from the outlet of the evaporative air cooler, which can reduce the noise below 2000Hz.

　　4. Reasonably choose the models of evaporative air cooler. In occasions with high noise control requirements, low-noise evaporative air cooler should be used. Under the same air volume and pressure of different models of evaporative air cooler, the centrifugal evaporative air cooler with airfoil blades have low noise, and the centrifugal evaporative air cooler with forward version blades have high noise.

　　5. The flow velocity of the airflow in the pipeline should not be too high, so as not to cause regeneration noise. Determine the airflow velocity in the pipeline should be selected according to different requirements according to relevant regulations.

　　6. ​​The noise level of the inlet and outlet of the evaporative air cooler is increased due to the ventilation and the wind pressure. Therefore, when designing a ventilation system, the pressure loss of the system should be minimized. When the total volume and pressure loss of the ventilation system is large, it can be divided into small systems.

　　Finally, remind that the air cooler has been used for a long time, and the clogging of the filter and chassis caused by dust and grit will also be one of the reasons for the noise of the evaporative air cooler. Therefore, proper cleaning and maintenance of the evaporative air cooler can reduce noise and extend the air conditioner’s use time.