Abstract: The thermal comfort of floor standing air conditioners of three different outlet types was tested in the thermal comfort laboratory and the outlet types were upper air outlet, upper and lower air outlets and lengthwise air outlet respectively. The test results show that there is the best thermal comfort for the floor standing air conditioner with upper outlet; for the floor standing air conditioner with upper and lower air outlets, because its flow of air from the outlet was divided into two streams, the momentum of the single streams of air was small and it was difficult to be blown far, so the too cold or too hot air flow at near the foot of the unit was easy to be detected in the room, and the temperature at the far of the unit in the room was low and the temperature uniformity was poor during heating; for the floor standing air conditioner with lengthwise air outlet, the position of height of its outlet is in the range of that of the main activity area of human body, and the too cold or too hot air flow at near the foot of the unit was also easy to be detected in the room, and at the same time the air flow of the unit couldn’t reach the position of foot, and the temperature uniformity was poor ,and vertical temperature difference was larger during heating in the room.

Key words: Air outlet, Floor standing air conditioner, Thermal comfort, Thermal comfort laboratory