Abstract: In order to improve the comfort of air apply for cooling and heating, of the air duct machine, as well as the impact of air volume, performance, and noise under two typical return air modes, and to distinguish it from existing centrifugal air duct machines with blowing, a suction type cross flow air duct machine has been studied and provided. Not only can it achieve advantages in box size and adapt to more installation scenarios, but it also has advantages in air supply comfort. The cooling air supply height is higher to avoid cold air blowing people, and the heating air supply height is lower, which can achieve early landing of warm air and warm feet with hot air. At the same time, two air inlet methods, rear return air and bottom return air, were simulated. While ensuring the width of the air inlet, the bottom return air has little impact on the air volume and cooling and heating effect, but the noise is relatively high.

Key words: Cross flow fan, Ducted type air conditioner, Air supply, Comfortable, Air return method