Cold storage refrigeration equipment 'sub-health' warning! Don't ignore these 6 abnormal phenomena!

In the fields of modern cold chain logistics, industrial refrigeration, and commercial cold chains, refrigeration equipment serves as the core temperature control carrier. Its operational stability directly affects energy efficiency and equipment lifespan. However, the complex refrigerant circulation and mechanical interlocking characteristics within the system make it prone to multiple factors leading to failures during long-term operation.

Today, let's learn together with Furdan about common system failures in refrigeration equipment.

Common system failures in refrigeration equipment

• Return of liquid

  For refrigeration systems using expansion valves, liquid return is closely related to improper selection and use of the expansion valve. An oversized expansion valve, too low superheat setting, incorrect installation of the temperature sensing bulb, damaged thermal insulation wrapping, or failure of the expansion valve can all lead to liquid return. Severe frosting on the evaporator or fan failure can also result in poor heat transfer, causing unevaporated liquid to return.

• Wet start

  The phenomenon of severe foaming of lubricating oil inside the compressor is called liquid carryover start. The foaming phenomenon during liquid carryover start can be clearly observed on the oil sight glass. The fundamental cause is that the refrigerant dissolved in the lubricating oil and the large amount of refrigerant settled below the lubricating oil boil when the pressure suddenly drops, causing foaming of the lubricating oil, which easily leads to liquid hammer.

• Liquid hammer

  To ensure the safe operation of the compressor and prevent liquid hammer, the suction temperature should be slightly higher than the evaporation temperature, i.e., it should have a certain degree of superheat. Under normal circumstances, the suction temperature should be 5～10℃ higher than the evaporation temperature.

• Exhaust temperature too high

  The main reasons for excessively high exhaust temperatures include: high suction temperature, large motor heating, high compression ratio, high condensing pressure, and improper refrigerant selection.

• High suction temperature

  Insufficient refrigerant charge in the system, or too small an opening degree of the expansion valve, blockage of the filter mesh at the expansion valve outlet, poor insulation of the suction pipe or excessively long pipes, etc., can all lead to high suction temperature.

• Exhaust temperature too low

  Throttle valve or dryer filter ice blockage or dirt blockage, as well as filter blockage, insufficient refrigerant charge.

  
  

The stable operation of the refrigeration system is the foundation for the performance of the equipment. The common faults mentioned above can reduce the lifespan of the equipment, affect the cooling effect, and increase energy consumption. Fland's self-developed Cold Cloud management platform reduces the failure rate of your cold storage and ensures more stable operation.

With AI one-click health diagnosis, it can detect subtle changes in cold storage, intelligently analyze potential risks, issue early warnings, and remotely diagnose faults to prevent small issues from becoming major problems. Up to 15 sensors comprehensively monitor system operation and provide full lifecycle management. Environmental temperature, suction temperature, discharge temperature, condensation temperature, spray temperature, suction pressure, discharge pressure, voltage, superheat, expansion valve opening, and fan speed are all monitored to avoid running the cold storage while it's malfunctioning.

In case of an alarm, notifications will be sent to the alarm recipient via SMS, email, or voice call. The alarm recipient can set their preferences to avoid missing any alarm messages. 

Fland, safeguarding the security of your goods!

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