Xindacool: original refrigeration equipment factory. Noise reduction evaluation and model selection of evaporator and condenser of field air cooler (dB)

Xindacool: original refrigeration equipment factory. Noise reduction evaluation and model selection of evaporator and condenser of field air cooler (dB)
The first paragraph (41 characters): the impact of noise from refrigeration equipment operation on facilities and surrounding environment; Xindacool can provide the actual measured noise data to support the noise reduction plan in the design project.
The equipment noise test shall be conducted at a distance of 1m from the shell and a height of 1.2m.: At full load, the noise of the large evaporative cooler is 62 to 75 dB(A), while the noise of the internal unit of the air cooler is 48 to 63 dB(A).
The variable-speed EC fan reduces the rotational speed under partial load; By reducing the fan speed by 30%, the total noise of the equipment can be reduced by 8 to 11 dB(A), which is the key measure to control the noise.
Noise will naturally decay with distance. Under the same conditions, the noise attenuation at a distance of 10m from the equipment is 12-15dB(A), so the location of the equipment directly determines the noise level of the equipment.
Under the condition of high noise, silencers and anti-seismic bases can be installed; The muffler can reduce the noise by 6 to 9 dB(A) additionally, while the anti-vibration base can reduce the sound transmission through the solid and reduce the vibration noise by about 55%.
Under T3 (55 C) working condition, the fan speed is forced to increase; In the same equipment, the noise in high temperature environment will increase by 3-5 dB(A), so when selecting the model, we should refer to the noise parameters under high temperature conditions.
The noise data of xindacool comes from the actual measurement in an independent laboratory; The test environment is a free sound field. Due to the reflection of the equipment room and the site wall, the field measurement value may be 2 to 4 dB(A) higher than that of the laboratory.
The dynamic balance of fan impeller is G6.3; If the dynamic swing does not meet the requirements, it will increase the vibration noise, resulting in an increase of 5 to 7 dB(A) in the total noise of the driver.
When multiple units are placed in parallel, the noise is calculated by superposition; When three units with the same noise level are placed in parallel, the total noise only increases by about 4.8 dB(A), which is not a simple numerical summation.
Low noise customization is a part of ODM service. By replacing the rotor with a low-speed rotor and adding silencing elements, the procurement cost increased by 11% to 17%, and the delivery time was extended by 7 to 10 working days.
The technical drawings will show the noise parameters 1 meter away, and provide the vibration parameters for the design office to conduct on-site environmental noise assessment and simulation.
The third-party performance test report also records the noise measurement results, which can be used for environmental assessment and acceptance; The reported error range is controlled within 2 db (a).
In the N+1 multi-unit system, only a few units run at night when the load is low, and the rest units stop running, which effectively reduces the environmental noise level of facilities at night.
Compared with asynchronous motor, EC motor not only saves energy, but also produces 4-6 dB(A) low noise when running at low speed. Therefore, it is suggested that the configuration of EC motor should be given priority in the projects that need noise reduction at night.
When adjusting to reduce the noise of customized explosion-proof models, muffler components must also meet the requirements of explosion-proof thickness; This double customization process has extended the delivery time by 18 to 22 working days.
FREQUENTLY ASKED QUESTIONS
1. Why is the noise in the laboratory different from that in the installation site? Due to wall reflection and pipeline vibration, the field measurement value is usually between 2 and 4 dB(A).
2. Will adding silencers reduce the cooling capacity? The muffler that meets the standard has reasonably controlled airflow resistance, and the decrease of cooling capacity is kept below 3%.
3. Are the dB values of multiple unit noises added directly? No, noise is added logarithmically; The sum of three units will only increase.