How to solve the two common problems in the operation of chillers?

It resonates with the duct shell and generates noise. The joints between the air duct and the inner surface of the fan housing should be smooth to avoid roughness and unevenness, which may cause tearing noise. In addition, when designing, sometimes the outside of the duct can be covered with soundproof materials to reduce noise.
In the pharmaceutical, food, chemical and other industries, process water cooling is required. The chiller has become a must-choice equipment for many industries. Understanding the operation of the equipment and performing correct operations are the prerequisites for ensuring the smooth operation of the equipment.

At the same time, industrial refrigerators are always worn out during use. Therefore, we need to regularly record and analyze its operating parameters, listen to the sounds made during operation, check the use of refrigerants and refrigerating oil, etc., and do it regularly. Maintenance operations. The author enumerates the common problems and solutions in the operation of chillers, hoping to help everyone.

What should I do if the temperature difference between the inlet and outlet of the chiller is small?

The technicians of Nanjing Haizhizhou Refrigeration Equipment Co., Ltd., who specialize in industrial refrigeration, commercial central air-conditioning, and industrial dehumidification equipment, analyzed the reasons for the small temperature difference between the inlet and outlet of the chiller.

The technical staff said that when users use the chiller, they encounter this situation: that is, the company uses a chiller, and the current inlet water temperature is 24°C, and the outlet water temperature is 23°C. The temperature difference is too small to meet user needs. The main reasons for the small temperature difference between the inlet and outlet water are as follows:

• 1. The output cooling capacity of the chiller is small, such as the chiller itself is faulty, or not fully loaded, etc. These can be preliminary judged by observing the operating current and other parameters of the chiller.
• 2. It may also be that the heat transfer effect is not good. For example, the heat transfer tube has serious fouling, which affects the heat transfer of the chiller. This can be judged by observing the heat transfer temperature difference between the water temperature and the evaporation temperature.
• 3. The water flow is too large. This can be judged by observing the pressure difference between the inlet and outlet of the evaporator and the running current of the water pump.
• 4. After eliminating the above problems, you can consider whether the sensor or the temperature gauge is inaccurate.

The technical staff said that under normal circumstances, if the chiller fails, you should directly communicate with the manufacturer on the phone to confirm what the fault is. The user can solve the minor fault by himself. If it cannot be solved, it is recommended that the chiller manufacturer arrange after-sales service. Service personnel come to conduct inspections and perform comprehensive maintenance on the unit.

The chiller fan produces noise

Noise is an annoying sound. Continuous noise can also pollute the surrounding environment. The reasons for the noise produced by the general chiller fan can be divided into the following:

When the blades rotate, they will rub against the air or impact. The frequency of noise is composed of multiple frequencies, and these frequencies are all related to the speed of the fan. Suggestion: If the axial flow fan is equipped with moving and static wings, the number of blades of the two should be different to avoid greater noise resonance.

Noise can also be generated when the blade generates vortex. During the operation of the fan, a vortex will be generated on the back of the moving wing. This vortex will not only reduce the efficiency of the fan, but also generate noise. In order to reduce this phenomenon, the installation angle of the blades should not be too large, and the bending of the blades should be smooth, and do not suddenly change too much.

It resonates with the duct shell and generates noise. The joints between the air duct and the inner surface of the fan housing should be smooth to avoid roughness and unevenness, which may cause tearing noise. In addition, when designing, sometimes the outside of the duct can be covered with soundproof materials to reduce noise.

In addition, in addition to the fixed noise of the fan itself, there are many noise sources. For example, due to insufficient precision of bearings, improper assembly or poor maintenance will cause abnormal noise. The motor part also produces noise, some of which are caused by poor design or poor manufacturing quality control, but sometimes it is caused by the internal and external cooling fans of the motor. Therefore, the selection of equipment must be strictly screened for regular products, taking into account factors such as the humanized design of the equipment.