Condensers and evaporators in automotive air conditioners are collectively referred to as heat exchangers. The performance of the heat exchanger directly affects the cooling performance of the car air conditioner. The metal material is expensive, bulky, and its mass accounts for 50% -70% of the total mass of the car air conditioner. The space occupied by it directly affects the effective volume of the car and is difficult to arrange. Therefore, it is very important to use an efficient heat exchanger of. So what is the role of the car condenser?
Condenser and evaporator in the car air-conditioning unit should be matched with the compressor, and should be compatible with the throttle expansion mechanism. Condenser and evaporator work status, a direct impact on the capacity of the refrigeration system (cooling capacity), compressor power consumption and the economy of the entire air conditioning unit. Therefore, the evaluation of condenser and evaporator performance should first consider their impact on the performance of the refrigeration system.
Condenser is the role of the compressor discharge of high temperature and high pressure refrigerant vapor cooling cooling, making it condensed into liquid high pressure refrigerant. The gaseous refrigerant is liquefied or condensed in the condenser. The refrigerant enters into the condenser with almost 100% vapor and is not 100% liquid when it exits the condenser. Only a certain amount of heat is available South condenser discharge time. Therefore, a small amount of refrigerant leaves the condenser in a gaseous state, but since the next step is to store the receiver and dryer, the state of the refrigerant does not affect the operation of the system. Compared with the engine coolant radiator, the condenser is subjected to higher pressure than the engine coolant radiator. When installing the condenser, take care that the refrigerant discharged from the compressor must enter through the upper end of the condenser and the outlet must be below, as this will cause the pressure in the refrigeration system to rise causing the condenser to burst.
In most cases, damaged condensers such as car accidents can not be repaired and need to be replaced with new ones. However, the condensation efficiency is reduced, the radiator temperature rise of the fault must be promptly excluded. As the refrigerant leaks, the engine oil cooler leaks, hydraulic fluid cooler leakage, will make the dust, sand, insects, etc. attached to the fins, over time, the more the more the formation of scale deposition, the air flow can not be smooth Through the condenser, resulting in decreased condensing efficiency. Meat, to the timely maintenance of the condenser, with a brush stained solution, clean up the fins dirt.
Condenser refrigerant exothermic process
Condenser refrigerant exothermic process has blue stage, that is, reduce overheating, condensation, overcooling.
The refrigerant entering the condenser is a high-pressure superheated gas, first of all cooled to the saturation temperature at the condensing pressure, and the refrigerant is still in the gaseous state. Then, under the condensing pressure, Gang release heat and gradually Ling condensate into a liquid, the process temperature remains unchanged. Finally, continue to emit heat, the liquid refrigerant temperature drops, become a supercooled liquid.
Air-conditioning condenser for car are air cooled condenser, it is generally arranged in front of the radiator head, condensing temperature is higher, so you must ensure better ventilation to enhance the cooling capacity of the condenser, the car air-conditioning in addition to normal In addition to the head-on cooling during driving, an electronic fan is also normally available, while the structure and materials of the condenser itself should be used to dissipate heat.