A method for directing thermal energy to an evaporator of a transport climate control circuit of a transport climate control system is provided. The method includes a controller determining whether the climate control circuit is operating in a start-stop cooling mode. Also, the method includes the controller determining a thermal energy charge of the thermal storage reservoir when the climate control circuit is operating in the start-stop cooling mode. The method also includes determining whether the thermal energy charge is greater than a charge threshold. Further, the method includes determining whether the climate control circuit is operating in a stop portion of the start-stop cooling mode when the thermal energy charge is greater than the charge threshold. The method further includes transferring thermal energy from the thermal storage reservoir to an evaporator when the climate control circuit is operating in the stop portion of the start-stop cooling mode.

Secondary loop air conditioning and heat pump systems include a reservoir with a capsule holding a phase change material.

A vehicle air conditioner includes a refrigeration cycle unit, a heater core, a cool air bypass passage, an air volume ratio regulator, and an auxiliary heat exchanger. The heater core is disposed in a heating passage located downstream of an evaporator with respect to an airflow. The auxiliary heat exchanger is provided in the refrigeration cycle unit. The evaporator includes a cold energy storage. The cold energy storage stores cold energy when the compressor is in operation, and dissipate cold energy while the compressor stops. The auxiliary heat exchanger is located downstream of the evaporator and upstream of the heater core with respect to the airflow. The auxiliary heat exchanger changes enthalpy of refrigerant by heat exchange between the refrigerant and air having been cooled by the evaporator and to be heated by the heater core.

Thermoelectric enhanced hybrid heat pump systems are provided herein. A compressor increases the pressure of refrigerant within tubing. A first heat exchanger is downstream of the compressor and changes enthalpy of first fluid flow through heat exchange with refrigerant. A second heat exchanger changes enthalpy of second fluid flow through heat exchange with refrigerant. A thermoelectric device is downstream of the first heat exchanger and reduces refrigerant temperature. Expansion valves are downstream of the thermoelectric device and first heat exchanger, respectively located on first and second sides of the thermoelectric device, and expand refrigerant and reduce refrigerant pressure while conserving refrigerant enthalpy. At least one valve reverses refrigerant flow within the tubing without changing compressor operation. A control system controls the thermoelectric device and at least one valve to switch the heat pump system from heating mode to cooling mode and from cooling mode to heating mode.

There is disclosed a vehicle air-conditioning device in which a refrigerant subcool degree in a radiator is appropriately controlled, so that comfortable and efficient vehicle interior air conditioning is achievable. The vehicle air-conditioning device executes a heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, decompresses the refrigerant by which heat has been radiated by an outdoor expansion valve 6, and then lets the refrigerant absorb heat in an outdoor heat exchanger 7. In the heating mode, the vehicle air-conditioning device controls a refrigerant subcool degree SC of the radiator 4 by the outdoor expansion valve 6. On a basis of a radiator inlet air temperature THin that is a temperature of the air flowing into the radiator 4, the controller corrects a target subcool degree TGSC that is a target value of the refrigerant subcool degree SC in the radiator 4 in a lowering direction, as the radiator inlet air temperature THin rises.

A heat pump circuit has the following components when seen in the flow direction: a compressor; a condenser or gas cooler; a first coolant/air heat exchanger as a sub-cooler, via which the coolant dispenses heat; a first expansion element; a first coolant/air heat exchanger, via which the coolant absorbs heat from the ambient air; a second expansion element; and a third coolant/air heat exchanger, via which the coolant absorbs heat from the ambient air. The arrangement of the heat exchanger is in front of the drive engine relative to the travel direction. The danger of the ambient heat exchanger freezing is minimized. With this arrangement.

A transport climate control system for providing climate control to a climate controlled space of a transport unit. The transport climate control circuit includes a compressor, an evaporator and at least two fans. The transport climate control circuit also includes a controller for controlling the transport climate control circuit and for defrosting the evaporator coil. When a defrost event is triggered, the controller instructs the transport climate control circuit to supply heat to or around one section of the evaporator coil, and independently controls each of the at least two fans to move the air around the evaporator coil in a controlled direction so that heat from the one section of the evaporator coil is used to convectively heat the inlet of the evaporator coil.

There is disclosed a vehicle air-conditioning device in which a refrigerant subcool degree in a radiator is appropriately controlled, so that comfortable and efficient vehicle interior air conditioning is achievable. The vehicle air-conditioning device executes a heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, decompresses the refrigerant by which heat has been radiated by an outdoor expansion valve 6, and then lets the refrigerant absorb heat in an outdoor heat exchanger 7. In the heating mode, the vehicle air-conditioning device controls a refrigerant subcool degree SC of the radiator 4 by the outdoor expansion valve 6. On a basis of a radiator inlet air temperature THin that is a temperature of the air flowing into the radiator 4, the controller corrects a target subcool degree TGSC that is a target value of the refrigerant subcool degree SC in the radiator 4 in a lowering direction, as the radiator inlet air temperature THin rises.

A multifunction reservoir for a secondary loop climate control system includes a coolant vessel, a capsule held in the coolant vessel and a phase change material in the capsule. A secondary loop air conditioning system and a secondary loop heat pump system incorporating one or more multifunction reservoirs of the type described are also disclosed.

Vehicle air conditioning device comprising a bypass pipe which passes a radiator and an outdoor expansion valve, and opening/closing valves. A control device executes a heating mode to open solenoid valve 30 and close solenoid valve 40, and a dehumidifying and heating mode to close the solenoid valve 30, open solenoid valve 40, let a refrigerant radiate heat in outdoor heat exchanger 7, let the refrigerant absorb heat in heat absorber 9, and generate heat in auxiliary heater 23. When changing from the heating mode to the dehumidifying and heating mode, the control device sends the refrigerant to receiver drier portion 14, controls a compressor to reduce a difference between pressures before and after the solenoid valve 40, opens solenoid valve 40, closes solenoid valve 30, shuts off the outdoor expansion valve, and shifts the compressor to control in the dehumidifying and heating mode.