Is there any way to reduce the noise problem of air source heat pumps?

With the implementation of the coal-to-electricity policy, more and more projects use air-source heat pump units, which have the advantages of simple installation and less restrictions by external conditions. In the past two years, air source heat pumps are not only limited to thousands of square meters of projects, many areas of hundreds of thousands of square meters of central heating projects have also begun to use air source heat pump units, nearly 200 air source heat pump units installed in a vacant land, the impact of noise is also very large, affecting the lives of surrounding residents.

For the noise allowable standards of civil buildings and various types of buildings, please refer to the following table (from the Code for Sound Insulation Design of Civil Buildings) GBJ118-88).

Allowable Noise Standard (db) for civil buildings

There are three aspects to noise reduction control:

1. Noise treatment of sound sources

2. Noise processing of sound transmission paths

3. Noise treatment in the workplace

Of the three methods, noise handling of sound sources is the most effective.

1. Noise treatment of sound sources.

The air source heat pump unit is placed outdoors, and most of the noise is transmitted to the building and rooms through the air. How to do a good job of noise reduction treatment for air source heat pump equipment is very important.

1. Try to choose low-noise air source heat pump equipment. Therefore, when purchasing an air source heat pump, you need to carefully read the sample information and test report. Through the comparison of multiple manufacturers, the appropriate air source heat pump unit is selected.

2. The installation position of the air source heat pump should be reasonable. Try to stay away from residential buildings and rooms, while taking into account the problem of heat loss due to long pipe networks. Avoid the noisy side directly facing buildings and rooms that need to be quiet.

3. Noise barriers are used to reduce the impact of equipment noise on buildings or rooms that need to be quiet. The closer the barrier is to the sound source or the higher the barrier, the more favorable the sound insulation. At the same time, the influence of barrier arrangement on the heat transfer performance of air source heat pumps should be considered.

4. Check the problems existing in the air source heat pump equipment

The compressor is one of the main noises of air source heat pumps. First, confirm that the compressor is operating properly. Secondly, it is necessary to check whether the compressor is treated with vibration isolation, that is, whether the bottom of the compressor is equipped with a shock absorbing pad, and the noise of the compressor installed with a shock absorbing pad can be reduced by 3 5db(a).

Fans are the other major noise source of air source heat pumps**. First of all, it is necessary to confirm that the fan is operating in normal production. Secondly, check whether the screws of the windshield are loose; Whether there is friction between the fan blade and the device, etc.

Add a muffler to the air outlet to reduce noise, or add an elbow to the air outlet to direct the noise in other directions. However, no matter which method is adopted, it must not affect the normal heat exchange of the unit.

Air source heat pump is an energy-saving product that absorbs heat in the air through the rotation of the motor, and the compressor produces heat, which is widely used in hot water heating, house heating, energy saving and safety, environmental protection is its main feature, and is widely loved by people. 1. Noise from an air source heat pump**. Second, the method of reducing the noise of the deep air heat pump.

Generally speaking, when the air source heat pump is running, there is enough noise, and we can improve it through the outside world when we use it, such as building a machine room, soundproof wall, and the unit itself to do a good job of silencing measures. Reduce point noise time. There's no such thing as a good way.

will depart from the noise, if the air source heat pump is the main.

1. If the vibration of the unit is relatively strong, you can choose a vibration isolator for the system to isolate the vibration. It can also be used to design the floating layer for the surface of the unit, and when designing on the ground, the isolation layer is used between the structural layers, which has a good shock absorption effect.

2. Install sound insulation devices for the pump set. This method is suitable for the noise caused by the air, usually people will place the outdoor unit of the pump unit on the roof of the building, when a large amount of air belt air passes around the unit to produce friction will produce noise, the air noise of the unit is generally less than 90 dB (a), and there is a floor interval between the outdoor unit and the room, which can block the air sound emitted by the pump unit. China has strict regulations on noise, if the unit produces too much noise, beyond the national range, or has a certain impact on the surrounding needs to be soundproofed for noise, you can add soundproof devices such as soundproof covers, soundproof ceilings, etc. to isolate noise.

3. Do damping and sound insulation treatment for the pipeline. Pipe damping and sound insulation can effectively reduce the vibration of the pipeline and isolate the air sound. Damped acoustic blankets can be used to keep pipes in place to reduce vibration.

4. Shock absorption treatment for the pipe support. The reason for part of the pipeline vibration is that the pipe support and the ground are hard properties, which causes friction between the pipeline and the ground when it vibrates, and the pipeline vibration is transmitted to the building structure to the interior, resulting in large noise. Shock absorption is done under the pipe support to organize vibration propagation.

In addition, the pipe through the wall should also be treated with corresponding shock absorption.

5. Choose a soft connection with strong seismic isolation performance for the pipeline. The connection between the pipeline and the pump unit is made of professional seismic isolation products, which should have corrosion resistance and long length. Do not choose rubber soft connections, short length, poor elasticity of soft connection products with poor seismic isolation effect.

The noise generated by the air source heat pump is mainly in the following aspects: the air sound generated by the operation of the pump set motor, the vibration of the pump set compressor causes the vibration of the building foundation and the work of the pump set to stimulate the resonance of the pipeline. Therefore, in order to completely solve the problem of heat pump noise, it is necessary to start from three aspects: air sound, equipment vibration and pipeline vibration.

1. Air acoustic treatmentAir sound insulation is relatively easy in terms of noise control of the pump set, the general noise of the air sound generated by the pump set does not exceed 85db(a), and the interval between the pump set and the owner room is at least one floor slab. Generally, the air sound insulation of 120mm cast-in-place concrete is greater than 52db, which is quite beneficial to isolate the air sound of the pump set. However, now the state has stricter requirements for the indoor sound environment, so if the pump set and the owner are only separated by a floor slab, the sound insulation needs to be treated with special treatment, and the commonly used methods are to add sound insulation cover, sound insulation ceiling, indoor sound absorption, etc.

2. The vibration isolation of the system is generally selected for the vibration isolation of the pump unit, and if the vibration of the pump unit is relatively strong, it is better to choose the practice of floating ground, because the vibration reduction effect of the floating ground is better, and the frequency band that can play a role in vibration reduction is also wider.

3. The pipeline vibration isolation treatment increases (replaces) the rubber soft connection of the pipeline connected to the pump group, and the general soft connection length is short and the elasticity is poor, resulting in the overall vibration isolation effect is not ideal, and the vibration isolation effect will be significantly increased after replacement. Professional vibration isolation products with good vibration isolation performance, long length and corrosion resistance should be selected for soft connection.

4. The general connection between the pipe support and the ground is hard connection, which causes the vibration of the pipeline to be transmitted to the building structure, and the vibration reduction treatment is done under the support, which can better prevent the transmission of vibration energy to the building structure.

5. Pipeline through the wall treatmentGenerally, the pipeline and the wall are hard connected, and a considerable part of the energy of pipeline vibration is transmitted to the building structure, so the pipeline and the wall should be disconnected to prevent the transmission of energy.

6. Pipeline damping and sound insulation bandaging The vibration noise of the pipeline is high, and the vibrating air sound will also affect the residents, so it is necessary to carry out comprehensive damping and sound insulation bandaging of the pipeline, on the one hand, it can reduce the vibration of the pipeline, and on the other hand, it can also play the role of isolating the air sound.

It can be seen that the noise control of the pump unit is a professional and systematic transformation project, and the design and treatment of vibration acoustics should be done together from the sound source, propagation and user reception, so as to minimize the impact of the noise of the air source heat pump unit on the owner.

Hello, the noise of the air energy water heater pump: 1. Reduce the impact of the noise of the main coarse key machine of the air energy water heater, such as the compressor and the silencer sleeve, and the fan adopts the silent type, that is, the low-noise air energy is selected as much as possible. 2. In addition to the good vibration damping of the compressor base inside the air energy water heater, the main engine of the air energy water heater should also have vibration reduction measures, in addition, the main engine of the air energy water heater should be as far away from the room as possible, or add a sound insulation screen between the adjacent rooms, but it should be noted that the sound insulation screen should not obstruct the circulation of ventilation airflow.

3. The main engine of the air energy water heater is arranged on the roof of the main building with the smallest influence surface. Air energy water heater From the building to the entrance and exit of the roof platform where the heat pump is located, there should be a soundproof door and a soundproof suite, or there should be an auxiliary room (such as a pump room, a power distribution room) and other partitions between the main body of the air energy water heater and the core tube of the building. 4. The water pump is also the main source of noise, and the vibration and noise isolation of the water pump is equally important.

If the water pump is placed indoors, it can not only prevent rain, but also sound insulation, and the pump room should be treated with sound absorption, such as the pump is placed outdoors, and the sound-absorbing data is pasted in the rain cover to reduce noise.