The condenser is the main heat exchange component in the air conditioning, the heat absorbed by the air conditioning system and the heat generated by the work done by the compressor all depends on its emission to the outside air. So far the condenser has developed to the third generation. The first generation is tube type, whose structure is copper tube through aluminum fins; The second generation of the belt type, is the extruded aluminum flat tube bent into a snake, and then in the middle of the welding strip aluminum fins, due to the elimination of copper all aluminum structure, and optimize the refrigerant channel structure, heat dissipation efficiency has been improved, so the weight is greatly reduced; Third generation is the parallel flow structure, it is on the basis of how to make significant improvements, hydraulic radius of aluminum flat tube is narrow, enhancing heat transfer of refrigerant and deserve to go up on opposite sides of the condenser header pipe, according to the refrigerant from the law of gas to liquid volume shrinking design refrigerant channel, further increase the cooling efficiency. This allows the condenser to be designed very thin, reducing wind resistance and reducing weight. The technical level of the parallel flow condenser has reached a very high level, and it is difficult to make a major breakthrough in the overall structure.

The development trend of evaporator, evaporator is another important heat exchanger of air conditioning and refrigeration system, it also occupies the minimum volume and has the minimum weight. Similarly, the development of evaporator has also gone through three generations. The first two generations are the same as the condenser, which are tube plate type and tube belt type, and the third generation is plate fin type. The heat transfer density of the plate-fin evaporator has also reached a high level, which can meet the requirements of the whole vehicle and the air conditioning system, and there will be no further development in the short term. The function of throttle structure is to decompress the refrigerant of medium temperature and high pressure into low temperature and low pressure. Have used in automotive air conditioning pipe orifice and the structure of two kinds of thermal expansion valve throttle, the orifice tube only has the function of throttling action does not have to adjust flow therefore need more mechanical energy consumption, economy is bad, use in the early days of the United States production luxury cars, with the emergence of energy crisis, less and less in the use of new models, at present the basic thermodynamic expansion valve.