Air Conditioner Terminal Device, Air Conditioning Apparatus And Data Center

An air conditioner terminal device (100) and a data center comprising the air conditioner terminal device, wherein the air conditioner terminal device (100) comprises a heat exchanger (12), a variable-speed fan (22), an air passage (101) communicating from an air suction port (11) to an air discharge port (21), and refrigerant flowing through the heat exchanger. The heat exchanger (12) and fan (22) are installed in the air passage (101), and the fan (22) forces air within the air passage (101) to flow towards the air discharge port (21) from the air suction port (11). The refrigerant comes into heat contact with air within the air passage (101) via the heat exchanger (12). The heat exchanger has an input joint (121) and an output joint (122), the refrigerant flows in via the input joint (121) and flows out the output joint (122). The refrigerant inside the input joint (121) is liquid-phase fluid, whereas the refrigerant inside the output joint (122) is gas-liquid two-phase fluid or gas-phase fluid.