Air conditioning system

An air conditioning system, comprising:

• an air conditioning subsystem comprising:
• a compressor;
• a first heat exchanger acting as one of a condenser and an evaporator;
• and a second heat exchanger acting as the other of the condenser and the evaporator, wherein the compressor, the first heat exchanger and the second heat exchanger are connected in sequence from the compressor through the first heat exchanger to the second heat exchanger;
• a phase change heat exchange subsystem comprising:
• a phase change material container;
• a phase change material accommodated in the phase change material container;
• and a heat exchange circuit provided in the phase change material container;
• and
• a cross-system heat exchanger comprising:
• a first circuit being connected to the air conditioning subsystem so that a heat exchange medium of the air conditioning subsystem can selectively flow through the first circuit, and a second circuit being connected to the heat exchange circuit of the phase change heat exchange subsystem so that a heat exchange medium in a circuit composed of the second circuit and the heat exchange circuit of the phase change heat exchange subsystem can selectively exchange heat with the phase change material accommodated in the phase change material container.