Vehicle air-conditioning device

An air-conditioning device for a vehicle, comprising:

• a compressor configured to compress and discharge a refrigerant;
• a heating unit that includes a heating heat exchanger configured to condense a high-pressure refrigerant discharged from the compressor during a heating operation for heating a space to be air conditioned, and to heat ventilation air supplied to the space to be air conditioned using the high-pressure refrigerant as a heat source;
• an outside air heat exchange unit that includes an outside air heat exchanger configured to absorb heat from outside air during the heating operation;
• a fan configured to regulate a wind speed of air supplied to the outside air heat exchanger;
• a controller configured to perform, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a temperature lower than a predetermined temperature;
• a valve configured to decompress a high-pressure refrigerant discharged from the compressor and having passed through the heating heat exchanger and the outside air heat exchanger, during the defrosting operation;
• and
• at least one or more evaporators configured to cause the refrigerant decompressed by the valve to be evaporated by absorbing heat, wherein
• in the dry defrosting mode, the controller is configured to cause the fan to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost,
• the controller is configured to have a condensation-heat defrosting mode in which the refrigerant circulates through the compressor, the heating heat exchanger, the outside air heat exchanger, the valve, and at least one or more evaporators in this order during the defrosting operation,
• at least one of the evaporators is a chiller that exchanges heat between a low-temperature-side heat medium circulating through a low-temperature-side heat medium circuit and the refrigerant,
• the low-temperature-side heat medium circuit includes
• a heat source that is disposed to radiate heat to the low-temperature-side heat medium,
• a battery heat exchange unit that exchanges heat between a battery and the low-temperature-side heat medium, and
• a low-temperature-side pump that circulates the low-temperature-side heat medium, and
• the controller is configured
• to perform the defrosting operation in the condensation-heat defrosting mode during charging of the battery, and
• to regulate an amount of heat supplied from the heat source to the low-temperature-side heat medium in such a manner that a temperature of the low-temperature-side heat medium falls within a low-temperature-side heat medium temperature range determined based on a charging efficiency of the battery.

An air-conditioning device for a vehicle, comprising:

• a compressor configured to compress and discharge a refrigerant;
• a heating unit that includes a heating heat exchanger configured to condense a high-pressure refrigerant discharged from the compressor during a heating operation for heating a space to be air conditioned, and to heat ventilation air supplied to the space to be air conditioned using the high-pressure refrigerant as a heat source;
• an outside air heat exchange unit that includes an outside air heat exchanger configured to absorb heat from outside air during the heating operation;
• a fan configured to regulate a wind speed of air supplied to the outside air heat exchanger;
• a controller configured to perform, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a temperature lower than a predetermined temperature;
• a valve configured to decompress a high-pressure refrigerant discharged from the compressor and having passed through the heating heat exchanger and the outside air heat exchanger, during the defrosting operation;
• and
• at least one or more evaporators configured to cause the refrigerant decompressed by the valve to be evaporated by absorbing heat, wherein
• in the dry defrosting mode, the controller is configured to cause the fan to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost,
• the controller is configured to have a condensation-heat defrosting mode in which the refrigerant circulates through the compressor, the heating heat exchanger, the outside air heat exchanger, the valve, and at least one or more evaporators in this order during the defrosting operation,
• at least one of the evaporators is a chiller that exchanges heat between a low-temperature-side heat medium circulating through a low-temperature-side heat medium circuit and the refrigerant,
• the low-temperature-side heat medium circuit includes
• a heat source that is disposed to radiate heat to the low-temperature-side heat medium,
• a battery heat exchange unit that exchanges heat between a battery and the low-temperature-side heat medium, and
• a low-temperature-side pump that circulates the low-temperature-side heat medium, and
• the evaporator includes the chiller and an air conditioning evaporator that is connected in parallel with the chiller and absorbs heat from the ventilation air,
• during the defrosting operation in the condensation-heat defrosting mode, the controller is configured
• (i) to causes a low-pressure refrigerant decompressed by the valve to flow into the chiller, when a temperature of the low-temperature-side heat medium is equal to or higher than a reference low-temperature-side heat medium temperature, and
• (ii) to cause the low-pressure refrigerant decompressed by the valve to flow into the air conditioning evaporator, when the temperature of the low-temperature-side heat medium is lower than the reference low-temperature-side heat medium temperature.

An air-conditioning device for a vehicle, comprising:

• a compressor configured to compress and discharge a refrigerant;
• a heating unit that includes a heating heat exchanger configured to condense a high-pressure refrigerant discharged from the compressor during a heating operation for heating a space to be air conditioned, and to heat ventilation air supplied to the space to be air conditioned using the high-pressure refrigerant as a heat source;
• an outside air heat exchange unit that includes an outside air heat exchanger configured to absorb heat from outside air during the heating operation;
• a fan configured to regulate a wind speed of air supplied to the outside air heat exchanger;
• and
• a controller configured to perform, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a temperature lower than a predetermined temperature, wherein
• in the dry defrosting mode, the controller is configured to cause the fan to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost, and
• in a state where a refrigerant discharge capability of the compressor in the dry defrosting mode is constant, the controller is configured to complete evaporation and removal of frost in the outside air heat exchanger and to end the dry defrosting mode of the defrosting operation, when a refrigerant pressure in the outside air heat exchanger exceeds a predetermined reference pressure.

An air-conditioning device for a vehicle, comprising:

• a compressor configured to compress and discharge a refrigerant;
• a heating unit that includes a heating heat exchanger configured to condense a high-pressure refrigerant discharged from the compressor during a heating operation for heating a space to be air conditioned, and to heat ventilation air supplied to the space to be air conditioned using the high-pressure refrigerant as a heat source;
• an outside air heat exchange unit that includes an outside air heat exchanger configured to absorb heat from outside air during the heating operation;
• a fan configured to regulate a wind speed of air supplied to the outside air heat exchanger;
• and
• a controller configured to perform, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a temperature lower than a predetermined temperature, wherein
• in the dry defrosting mode, the controller is configured to cause the fan to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost, and
• in a state where a refrigerant discharge capability of the compressor in the dry defrosting mode is regulated in accordance with a target condensation temperature determined based on an outside air temperature, the controller is configured to complete evaporation and removal of frost in the outside air heat exchanger, and to end the dry defrosting mode of the defrosting operation, when the refrigerant discharge capability of the compressor decreases to predetermined reference discharge capability.

An air-conditioning device for a vehicle, comprising:

• a compressor configured to compress and discharge a refrigerant;
• a heating unit that includes a heating heat exchanger configured to condense a high-pressure refrigerant discharged from the compressor during a heating operation for heating a space to be air conditioned, and to heat ventilation air supplied to the space to be air conditioned using the high-pressure refrigerant as a heat source;
• an outside air heat exchange unit that includes an outside air heat exchanger configured to absorb heat from outside air during the heating operation;
• a fan configured to regulate a wind speed of air supplied to the outside air heat exchanger;
• and
• a controller configured to perform, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a temperature lower than a predetermined temperature, wherein
• in the dry defrosting mode, the controller is configured to cause the fan to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost, and
• the controller is further configured
• to perform at least one of supply of air to the outside air heat exchanger by the fan or regulation of a temperature of a refrigerant flowing through the outside air heat exchanger or a heat medium flowing through the outside air heat exchanger in the dry defrosting mode, and
• to perform the dry defrosting mode in such a manner that in a case where a tangent to a saturation line is drawn at a saturation point of an outside air temperature in a psychrometric chart, a state of air on an air outlet port side of the outside air heat exchanger is located in an area below the tangent in the psychrometric chart.