Air conditioning system and a control method thereof

An air conditioning system comprising an indoor unit, an outdoor unit, a medium circulation pipe and a control unit;

• the indoor unit and the outdoor unit being connected through the medium circulation pipe, and the outdoor unit being in signal communication with the control unit;
• wherein the indoor unit comprises a radiant heat dissipation casing having a medium flow channel and a built-in heat exchanger and a fan mounted in the radiant heat dissipation casing, the fan is in signal communication with the control unit;
• the radiant heat dissipation casing comprises an air inlet and an air outlet;
• the radiant heat dissipation casing and the built-in heat exchanger are connected with the medium circulation pipe respectively, and the radiant heat dissipation casing is arranged in parallel with the built-in heat exchanger;
• the indoor unit has a first operation mode, wherein both the radiant heat dissipation casing and the built-in heat exchanger are in a heat exchange operation state;
• the indoor unit has a second operation mode, wherein the built-in heat exchanger is in a heat exchange operation state and the radiant heat dissipation casing is in an inoperation state;
• the indoor unit has a third operation mode, wherein the radiant heat dissipation casing is in a heat exchange operation state and the built-in heat exchanger is in an inoperation state,
• wherein the radiant heat dissipation casing comprises a plurality of the medium flow channels therein,
• wherein the radiant heat dissipation casing comprises a plurality of housing modules connected in sequence, an outer surface of the housing module has heat dissipation fins, each of the housing modules has at least one of the medium flow channels,
• wherein a female plug is provided at one end of the medium flow channel of each housing module, and a male plug is provided at the other end, and when docking the two adjacent housing modules, the male plug is inserted into the female plug to complete the sealed connection.