Answer
The temperature of the air rises as it approaches hose because of the stagnation process. In the frame of reference moving with the aircraft, the air decelerates from high speed to zero at the hose, and this the cause the air temperature to rise.
Work Step by Step
The temperature of the air rises as it approaches hose because of the stagnation process. In the frame of reference moving with the aircraft, the air decelerates from high speed to zero at the hose, and this the cause the air temperature to rise.