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【 Technical knowledge】 Working principle and introduction of cabinet air conditioner

1) Introduction of cabinet air conditioner:

The cabinet air conditioner is composed of compressors, condensers, thermostats, capillary tubes, evaporators, fans and other main components. It compresses the refrigerant through the compressor, condenses and releases heat, and then evaporates and absorbs heat to reduce the temperature of the environment. When installed on the control cabinet, it can transfer the heat and water vapor in the cabinet to the outside of the cabinet under airtight conditions, thereby It avoids the high-temperature dust and corrosive gas in the external environment from entering the control cabinet, causing equipment failure. The temperature and humidity in the control cabinet are always constant at 30~32℃, 45~55%RH in an ideal state, which ensures the service life and working stability of electronic components.

2) The cooling working principle of the cabinet air conditioner:

The compressor of the cabinet air conditioner sucks the gaseous refrigerant from the evaporator and compresses it into a high-temperature and high-pressure state, and then discharges it into the condenser. The refrigerant in the low-pressure state enters the evaporator, and the refrigerant absorbs heat in the evaporator and transforms into a gaseous state, which is then sucked by the compressor. So repeated, a refrigeration cycle is formed. The condenser and evaporator are each equipped with a circulating fan to enhance air convection and heat exchange. The heat exchange between the condenser and the air is carried out outside the control cabinet, while the heat exchange between the evaporator and the air is carried out in a closed control cabinet. The electrical control system mainly monitors the air state of the cooled closed space and controls the refrigeration cycle according to the temperature setting requirements. Among them, the temperature controller and the temperature control probe track and display the current temperature of the confined space at all times.

 The airflow diagram of the working process of the cabinet air conditioner is as follows:

3) Features of cabinet air conditioners:

Since the rack air conditioner can decide whether to supply air according to the specific temperature in the rack, its efficiency is relatively high .


  • Because the cold air is sent directly to the heat source, it can ensure that there are no hot spots in the cabinet , and can prevent dust, moisture and corrosive gases from entering the cabinet. It is suitable for temperature and humidity control of communication cabinets with high reliability. It is an electronic control A strong guarantee for the reliable operation of the system.
  • Special heat exchanger is adopted, which has large heat transfer capacity, low wind resistance, strong overall structure, dust resistance, oil resistance and anti-corrosion;
  • Use of cooling medium without FCKW (Freon), environmental protection, energy saving and high efficiency;
  • Exquisite patented fast-installation and fixing structure, the installation process is simple and fast;
  • The remote automatic intelligent monitoring system can conduct online monitoring and interactive control of the temperature control field information of the cabinet at any time ;
  • Higher protection level (reaching national standard internal IP55 and external IP34 requirements) improves the safety and reliability of the cabinet;
  • There are various installation methods such as wall-mounted, half-recessed, fully-recessed, and top-mounted to meet the needs of customers on site.


  • High energy consumption.