An air conditioning system of a motor vehicle with a refrigeration circuit and with a coolant circuit. The refrigeration circuit includes a compressor, a refrigerant-coolant heat exchanger operable as a condenser/gas cooler for the heat exchange between the refrigerant and the coolant of the coolant circuit, a first expansion device, and a first refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment. The coolant circuit includes a conveying device, a first coolant-air heat exchanger for heating the intake air for the passenger compartment and the refrigerant-coolant heat exchanger. The refrigeration circuit further includes a second refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment with a second expansion device located upstream in flow direction of the refrigerant. The coolant circuit is formed with a second coolant-air heat exchanger for heating the intake air for the passenger compartment.

An arrangement for de-icing a heat exchanger includes an air guiding housing and at least one fan. The air guiding housing is configured to take in an air from an outside of a motor vehicle through an inlet opening and to discharge the air from an outlet opening. The fan is positioned between the inlet opening and the outlet opening inside the air guiding housing and is configured to circulate the air in the air guiding housing. The heat exchanger is positioned between the inlet opening and the outlet opening inside the air guiding housing and allows the air to pass therethrough, thereby being configured to cool the air. The inlet opening and the outlet opening each are configured to be closed. The air guiding housing is configured to cause a circulation flow therein when the fan is operated while the inlet opening and the outlet opening are closed.

An air conditioner for a vehicle includes an air conditioning case having a first air passageway and a second air passageway partitioned by a separator therein; a PTC heater disposed in each of the first air passageway and the second air passageway to generate heat by electric energy; and a control unit for controlling operation of the PTC heater. The control unit individually controls discharge temperature of the first air passageway and discharge temperature of the second air passageway of the PTC heater, and if target discharge temperature of the first air passageway and target discharge temperature of the second air passageway are different from each other, the control unit calculates and outputs a compensation value for the PTC heater output of at least one of the first air passageway and the second air passageway. The PTC heater therefore has a reduced output when controlling for dual temperatures.

An air conditioning system has a heat pump, a first-liquid-medium circuit in which a first liquid medium circulates, a second-liquid-medium circuit in which a second liquid medium circulates, a heat source, a connection switching device, and a controller. The connection switching device switches between a connection state in which the heat source is connected to the second-liquid-medium circuit and a disconnection state in which the heat source is disconnected from the second-liquid-medium circuit. The controller controls the connection switching device to switch between the connection state and the disconnection state based on a heat-related physical quantity relating to a heat of the first-liquid-medium circuit, a heat-related physical quantity a heat of the second-liquid-medium circuit, a heat-related physical quantity the heat generated by the heat source, or a heat-related physical quantity a heat of the heat pump.

A waste heat utilization system for an electric vehicle having an electric motor and a battery may include a first cooling circuit in which a first coolant circulates and having arranged therein the electric motor, a first direct heat exchanger for discharging heat from the first coolant into surroundings of the system, and a first delivery device for driving the first coolant. The system may also include a second cooling circuit in which a second coolant circulates and having arranged therein the battery and a second delivery device for driving the second coolant. The system may also include an air conditioning circuit in which a working medium circulates, and having arranged therein a compressor, condenser, and evaporator. The system may further include first and second chillers by which heat may be transferrable from the first and second cooling circuits into the air conditioning circuit, and first and second heat exchangers incorporated in one of the first and second cooling circuits for discharging heat into the surroundings.

An electric heating device having a housing with a fluid inlet and with a fluid outlet, wherein the housing can be flowed through by a fluid, and wherein a number of heating elements protrude into the interior of the housing, wherein the heating elements have a heating element housing, and wherein a heating element has at least one heater in the heating element housing and the at least one heater has contacting contact elements and an electrical insulation for insulating the contact elements from the heating element housing, wherein the heating elements are sealingly connected with their heating element housing to the housing, wherein the heater of the heating elements are arranged in a geometrical configuration between the contact elements.

A heating device for a vehicle and a method for operating the heating device includes a flow path for a heat transport medium and an electrical heating arrangement for heating the heat transport medium on a heating section of the flow path. The heating section has at least two channels running in a serpentine pattern, through which the heat transport medium can flow in parallel.

A method for heating a vehicle is disclosed. The method comprises heating coolant with an electric heater and selectively heating the coolant with an engine. The method further comprises selectively supplying the coolant to each of a plurality of heating zones, and calculating a heat load of heat exchangers corresponding to the heating zones. The heating of the coolant is based the heat load in the heating zones.

An air conditioning system comprises a compressor (1), an outdoor heat exchanger (3), a first heat exchanger (101), a second heat exchanger (102) and at least two throttling devices, wherein the outdoor heat exchanger is a micro-passage heat exchanger and comprises a first inlet (31), a second inlet (32), an outlet (33), a distributing pipe (36), a collecting pipe (37), a flat pipe (38), a fin (39) and a distributor (34) which is located in the distributing pipe (36) and used for distributing a working medium, and a distribution small hole (35) is provided in the distributor (34); and the first inlet (31) is in direct communication with a distributing cavity (30) of the distributing pipe (36), while the second inlet (32) is in communication with the distributing cavity (30) through the distributing small hole (35) in the distributor (34).

A PTC heater device includes a housing unit, a PTC unit fastened to the housing unit including a plurality of PTC rods and a heat exchanger portion, and a ground terminal to which some parts of the plurality of PTC rods are fastened. At least one of the plurality of PTC rods has a structure that is separated.