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How to solve common problems in the operation of chillers

Update:23-01-2021
Summary:

The temperature difference between the inlet and outlet […]

The temperature difference between the inlet and outlet of the chiller is too small.
   1. The output of the chiller is small. For example, the chiller itself is faulty and may not be fully loaded. These can be preliminary judged by investigating 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 scale and affects the heat transfer of the chiller. This can be judged by investigating 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 investigating the pressure difference between the inlet and outlet water of the evaporator and the working current of the water pump.
  4. In the future, after removing the above problems, you can consider whether it is a sensor or an inaccurate thermometer.
   The noise problem of the chiller fan:
   Noise is an annoying sound, and continuous noise can also pollute the surrounding environment. The reasons for the noise of the general chiller fan can be described as follows:
   When the blades rotate, they will collide with the air or have an impact. The frequency of noise is composed of multiple frequencies, which are all related to the speed of the fan. Proposal: If the axial flow fan is equipped with moving and static wings, the number of blades** of the two is different to avoid greater noise resonance.
   Noise also occurs when the blades generate vortex. During the operation of the fan, eddy currents will occur on the back of the moving wings, which will not only reduce the power 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 produces noise. The joints between the air duct and the inner surface of the fan casing should be smooth to prevent roughness and unevenness from forming a tearing sound. In addition, when planning, sometimes it is possible to cover the outside of the air duct with sound-proof 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 lack of precision, improper installation or insufficient protection of the bearing will cause abnormal noise. Noise can also occur in the motor part, some of which are caused by poor planning or poor manufacturing quality control, but sometimes caused by the internal and external cooling fans of the motor. Therefore, in the selection of equipment, industrial chillers must strictly screen regular products and consider factors such as equipment humanized planning.

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