Disclosed is an air conditioning system for a vehicle which includes a cold air passageway having a heat exchanger for cooling and a warm air passageway having a heat exchanger for heating inside an air-conditioning case to carry out cooling and heating and which controls to inhale indoor air inside the vehicle, pass the air through the heat exchanger for cooling and discharge the air outside the vehicle in a specific mode, thereby preventing frosting of the heat exchanger for cooling because supplying air of high temperature dehumidified inside the interior of the vehicle to the heat exchanger for cooling, and enhancing heating performance by rising refrigerant pressure and temperature in the refrigerant cycle without needing additional components.

An external connection device including a ventilation mechanism and an antenna; the ventilation mechanism includes a housing assembly and a fan arranged inside the housing assembly; wherein the housing assembly is provided with a first through hole and a second through hole, and the fan is connected with a fan cable extending out of the housing assembly from the first through hole; and the antenna is arranged on an outer wall of the housing assembly, and the antenna is connected with the antenna cable, and the antenna cable extends into the housing assembly from the second through hole and extends out of the housing assembly from the first through hole.

A working device includes a first filter device to remove an object to be removed contained in introduced outside air, a second filter device to remove an object to be removed contained in the introduced outside air, the second filter device being different from the first filter device, a right rear pillar configured to support one side in a left-right direction of a roof of a cabin and including an opening to take in the outside air introduced into the first filter device, and a left rear pillar configured to support the other side in the left-right direction of the roof and including an opening to take in the outside air introduced into the second filter device.

A working vehicle includes a roof defining a ceiling portion of a cabin and including an internal space capable of accommodating equipment inside, and a filter assembly positioned in the internal space so as to be located on a rear side of the roof and including a filter device configured to remove an object to be removed included in introduced outside air, a blower configured to introduce outside air into the filter device, a second guide through which the outside air having passed through the filter device flows, and an air conditioner positioned in the internal space so as to be located on a front side of the roof and configured to feed the outside air having flown through the second guide into the cabin, and the blower and the second guide are positioned in the internal space between the air conditioner and the filter assembly in a front-rear direction.

A vehicle air-conditioning apparatus includes a filter case configured to accommodate a filter, and a filter cover configured to couple to an open upper end of the filter case. The filter case defines an inner space configured to accommodate the filter therein and having the open upper end to receive and discharge the filter therethrough. The inner space is inclined with respect to a vertical direction to allow the filter to be received into and discharged from the filter case in an inclined state. The filter cover includes a fixing protrusion protruding from a lower surface of the filter cover facing the inner space of the filter case and being configured to press and fix the filter in the inner space.

An air conditioning system includes: an air conditioning duct through which air can flow; at least one air conditioning device provided in the air conditioning duct, the at least one air conditioning device being configured to adsorb and desorb an adsorption target substance; and a control unit configured to control a flow rate of the air flowing through the air conditioning duct and the air conditioning device. The control unit repeatedly executes a cycle of executing the regeneration mode in which the air conditioning device is controlled to desorb the adsorption target substance followed by the adsorption mode in which the air conditioning device is controlled to adsorb the adsorption target substance.