Provided is a vehicular refrigeration cycle unit that is interposed between a vehicle-outside heat exchanger and a vehicle-inside heat exchanger and that exchanges heat between secondary refrigerants respectively flowing through the vehicle-outside heat exchanger and the vehicle-inside heat exchanger. The vehicular refrigeration cycle unit includes a refrigeration cycle provided in a device accommodation space inside a vehicle, the refrigeration cycle including a compressor, a condenser, an expansion valve, and an evaporator through which a primary refrigerant having flammability and having a higher specific gravity than atmosphere flows sequentially, and a leakage sensor located below the compressor, the condenser, and the evaporator and is configured to detect the concentration of the primary refrigerant contained in air in the device accommodation space.

A vehicle air-conditioning apparatus includes emergency dampers switchable between opening states for opening emergency vents and closing states for closing emergency vents. A control device switches the emergency dampers from the closing states to the opening states while keeping an indoor fan operating, when determining that refrigerant is leaked from a refrigerant circuit on the basis of results of detection by refrigerant leakage detectors. An indoor unit chamber includes supply air guiding sub-chambers for guiding the internal air delivered by the indoor fan to supply openings. The emergency vents are included in the supply air guiding sub-chambers. The indoor fan forms flows of the internal air with the air pressures in the supply air guiding sub-chambers being higher than the atmospheric pressure.

The present disclosure provides an integrated temperature control system for a vehicle, including: an air suspension subsystem, which includes a working medium, the working medium being a flame-retardant gas; and a temperature control subsystem, which is connected to the air suspension subsystem and includes a refrigerant. The temperature control subsystem is configured to operably receive the working medium in the air suspension subsystem, and is configured to perform control based on the refrigerant leakage concentration in the temperature control subsystem and a signal related to the refrigerant leakage, so as to selectively inject the working medium into the interior of the temperature control subsystem. The present disclosure also provides a method for controlling the integrated temperature control system for a vehicle.

A temperature adjustment system for an electric vehicle includes: a compressor for compressing a CO.sub.2 coolant; a first heat exchanger for cooling the coolant compressed by the compressor; cooling expansion valves for expanding the coolant cooled by the first heat exchanger; a coolant passage for supplying the coolant expanded by the cooling expansion valve to an air conditioner when cooling the air; a coolant passage for supplying the coolant expanded by the cooling expansion valves to a motor when cooling the motor; a common rail and an injector for expanding and injecting the coolant into a battery case; coolant passages for supplying the coolant after cooling the air conditioner to the common rail and the injector when cooling the air conditioner and cooling a battery; and coolant passages for supplying the coolant that has passed through the air conditioner, the motor, and the battery to the compressor.

An in-vehicle air conditioner includes a refrigerant circuit for circulating a hydrocarbon refrigerant, the refrigerant circuit having a compressor, a condenser, an expansion valve, and an evaporator. The in-vehicle air conditioner includes a heat exchanger which is integrally formed with the evaporator of the refrigerant circuit to cool a cooling liquid with the refrigerant contained in the evaporator, and a cooling liquid circuit for circulating the cooling liquid. The cooling liquid circuit has a cooler core. The cooling liquid circuit includes a gas-liquid separator and a relief valve. The relief valve is disposed on a top part of the gas-liquid separator outside a vehicle compartment and is configured to open when a pressure inside the gas-liquid separator is increased.