Many people are not very clear about the use of truck refrigeration unit (TRU), and some wrong use methods may reduce the service life of the refrigerating unit. Share several precautions when using TRU:
- First, let’s take a look at the principle of refrigeration units. At present, refrigeration units of refrigerated trucks mostly use mechanical refrigeration, which is basically the same as air-conditioning refrigerators and other refrigeration principles. It absorbs heat at one point and then dissipates heat at another point. The refrigerant absorbs heat through a coil (evaporator) in the cargo space, and then dissipates the heat through another coil (condenser) on the outside. A refrigeration compressorallows the refrigerant to circulate in the system.
- Understand the components of refrigerated truck refrigeration unit: refrigerant and four major parts, namely compressor, condenser, expansion valve, and evaporator.
Æ Compressor: The compressor is the power of the refrigeration cycle. It is driven by the engine to continuously rotate. In addition to pumping out the vapor in the evaporator in time to maintain low temperature and low pressure, it also increases the pressure and temperature of the refrigerant vapor through compression to create The condition that the heat of the refrigerant vapor is transferred to the external environment medium.
Æ Condenser. The condenser is a heat exchange device that uses the ambient cooling medium (air or water) to take away the heat of the high-temperature and high-pressure refrigerant vapor from the cold compressor to cool and condense the high-temperature and high-pressure refrigerant.
Æ Throttle element (ie expansion valve), high-pressure and normal temperature refrigerant liquid is directly sent to the low-temperature scale evaporator without ears. According to the principle of saturation pressure and saturation temperature-the corresponding principle, the pressure of the refrigerant liquid is reduced, thereby reducing the refrigerant liquid temperature.
Æ The evaporator, the evaporator is also a heat exchange device. After throttling, the low-temperature and low-pressure refrigerant liquid evaporates (boils) into vapor, absorbs the heat of the material to be cooled, reduces the temperature of the material, and achieves the purpose of freezing and refrigerating food. In the air conditioner, the surrounding air is cooled to achieve the effect of cooling and dehumidifying the air. rv ac units
