The condenser and evaporator are the heat exchange vessels of the automotive air conditioning system. The high-pressure and high-temperature refrigerant gas transfers heat to the outside in the condenser (releasing heat) and condenses (liquefies) into high-pressure liquid, thus changing the form of the refrigerant, but the pressure is basically unchanged; the low-pressure liquid is in the evaporator with the outside ( The heat in the cab) undergoes heat exchange (absorbing heat) to produce a phenomenon of boiling (vaporization), so that the temperature of the space is continuously lowered, and low-pressure refrigerant gas is generated after boiling (vaporization), thus changing the form of the refrigerant, but The pressure is also largely unchanged.
The most common failures of condensers and evaporators are clogged dirt and leaks. Dirt blockage can be repeatedly flushed with nitrogen or dried compressed air until it is clean and unobstructed.
Condensers and evaporators must be cleaned of external dirt frequently, and the heat transfer fins must not be knocked down or damaged to ensure their heat transfer performance.
The leakage of the condenser can generally be seen from the appearance, such as scratches and bumps, and oil stains seeping from the leakage point. The leakage of the evaporator is generally not easy to be found because of the low pressure and condensation on the outer surface, which is hidden in the evaporation box.
The leak detection of the condenser and the evaporator is generally obtained through the air tightness test (pressurization test). The test pressure is: 2.0-2.4MPa for the condenser; 1.2MPa for the evaporator.
Under normal circumstances, the surface temperature of the evaporator is very low, but there is only a lot of condensation and no frost or ice.
