What is the reason for the warm air not being hot in external circulation but hot in internal circulation?
1 Answers
The reason for the warm air not being hot in external circulation but hot in internal circulation is: the external environment temperature is low, and when in external circulation, the cabin is connected to the outside, allowing cold air to enter. When internal circulation is turned on, it means external circulation is turned off, isolating the cabin from the outside, so no cold air enters, hence the external circulation is not hot while the internal circulation is. The methods for using air circulation in cars are: 1. Use internal circulation during traffic jams and external circulation during high-speed driving; 2. The use of internal and external circulation should be combined with air conditioning and heating; 3. Use external circulation during long-distance driving to allow fresh outside air to enter the car, avoiding low oxygen levels inside the car.