PURPOSE: To prevent that airconditioning capacity at the time of maximum airconditioning thermal load is insufficient at the time of floating travel of a magnetic levitation type rolling stock by constituting the system go that it cools a thermal storage agent when the rolling stock is at a standstill and adds the cooling capacity of the thermal storage agent to the cooling capacity of a vapor cycle system at the time of maximum thermal load.

CONSTITUTION: The coolant of a vapor cycle compressed by a compressor 1 expands by expansion valves 5, 6 after it is cooled and liquefied by a oondensor 2 and enters into evaporators. An evaporator 4 exclusively used for airconditioning and an evaporator 3 wherein a thermal storage agent is contained are included in the evaporators, and the coolant is flowed to both evaporators when the rolling stock is at a standstill. On that occasion, a switching valve 8 of air conditioning air allows the air to flow only to the evaporator 4 exclusively used for airconditioning, and the thermal storage agent is cooled in the evaporator 3 containing the thermal storage agent. On the other hand, when airconditioning thermal load becomes large at the travel time of the rolling stock, a part of air for airconditioning is flowed to the evaporator 4 exclusively used for airconditioning by controlling the opening of the switching valve 8 properly, a part of air is flowed to the evaporator 3 containing the thermal storage agent to flow them together, and send to passenger's rooms.