What is the difference between internal and external air circulation for heating?
1 Answers
The differences between internal and external air circulation for car heating are as follows: 1. Internal circulation mode closes the air duct leading to the outside of the car. In this mode, the air blown out from the air vents is the air inside the car. You can think of internal circulation as the air inside the car continuously circulating. External circulation mode draws air from outside the car into the interior. Car air conditioning systems have both internal and external circulation modes. If driving in congested urban areas, it is recommended to use internal circulation mode. For long-distance driving or highway travel, it is advisable to use external circulation mode to replenish fresh air into the car, which is beneficial for the health of the passengers. 2. The heating principle of car air conditioning is quite simple. During heating, high-temperature coolant from the engine flows through the heater core. At the same time, air blown by the blower also passes through the heater core, allowing the car's air vents to blow warm air. The heater core is a heat exchanger and is a crucial component for the car's air conditioning system. Without the heater core, the car's air conditioning system would be unable to produce heat. 3. The cooling principle of car air conditioning is relatively straightforward. During cooling, the engine drives the compressor to operate. The compressor continuously compresses the refrigerant and delivers it to the evaporator. Inside the evaporator, the refrigerant expands and absorbs heat, cooling the evaporator. The cooled evaporator then cools the air blown by the blower, allowing the air conditioning to blow cold air.
