The invention relates to an air-conditioning device for a motor vehicle, comprising a refrigerant circuit (100) including a compressor (34), an indoor heat-exchanger (WÜ) arrangement connected to the outlet of the compressor and comprising a first and a second air/refrigerant-heat exchanger segment (21, 22), a first expansion valve (Exp. valve) (41) arranged therebetween, a second expansion valve (42), and a coupling heat exchanger (23) thermally connected to a heat source or sink, the outlet of which is connected to the inlet of the compressor (34), where the first and the second refrigerant line sections (I/II) are interconnected by means of a fourth refrigerant line section (IV), the inlet of the second air/refrigerant-heat exchanger segment (22) and the outlet of the coupling heat exchanger are interconnected by means of a fifth refrigerant line section (V) which contains a third expansion valve (43), and the outlet of the first air/refrigerant-heat exchanger segment (21) and the inlet of the compressor (34) are interconnected by means of a sixth refrigerant line section (VI).

The present invention provides a vapor injection module and a heat pump system using the same, the vapor injection module including an expansion valve configured to allow a condensed refrigerant to pass therethrough or expand a condensed refrigerant in accordance with an air conditioning mode, and a gas-liquid separator configured to receive the refrigerant from the expansion valve and separate the refrigerant into a gaseous refrigerant and a liquid refrigerant, in which the expansion valve has a plurality of expansion regions and performs operations of allowing the refrigerant to pass therethrough, performing first-stage expansion on the refrigerant, or performing second-stage expansion on the refrigerant in accordance with arrangement positions of the expansion regions.

A secondary loop HVAC system including an evaporator, a condenser, an expansion valve, and a compressor. A refrigerant loop is in fluid communication with each of the evaporator, the condenser, and the expansion valve. An HVAC case includes a first heat exchanger and a second heat exchanger. A first coolant loop is in fluid communication with the first heat exchanger, the second heat exchanger, and either the evaporator or the condenser. A valve system is configured to control flow of the coolant through the first coolant loop. In a maximum hot heating mode, the valve system is configured to direct the coolant through the condenser, the first heat exchanger, and the second heat exchanger. In a maximum cold cooling mode, the valve system is configured to direct the coolant through the evaporator, the first heat exchanger, and the second heat exchanger.

Embodiments of the present invention provide a lubricant management system (100) in a heat flux management system for an electric vehicle (150), comprising a vehicle air conditioning circuit comprising a refrigeration cycle refrigerant circuit (6) comprising at least a heat pump condenser (17) in thermal communication with a heat source (19), first and second evaporators (31, 131) each associated with an expansion valve (29, 129), and a refrigerant compressor (11), wherein the components are fluidly connected to one another by a refrigerant line (9,45), an accumulator (37) having a lubricant storage capacity and comprising lubricant delivery means (38), the accumulator being fluidly coupled in the refrigerant line downstream of the first and second evaporators (31, 131) and upstream of the refrigerant compressor (11), wherein the first evaporator and the second evaporator are fluidly connected in parallel downstream of the heat pump condenser (17) and upstream of the accumulator (37) and the associated expansion valves (29, 129) are operable to control a refrigerant flow rate through the first and the second evaporators (31, 131) sequentially to flush lubricant from the first and second evaporators to the lubricant storage capacity of the accumulator (37).

A method for operating a refrigeration system for a motor vehicle. The method includes setting an operating mode of the refrigeration system having active primary line and inactive secondary line or having active secondary line and inactive primary line; detecting the pressure in the inactive line; and activating and extraction of refrigerant from the inactive line into the active line by lowering the pressure in the active line to a value below the pressure in the inactive line and by opening the relevant valve device.

A thermal management device having an indirect air conditioning circuit for a motor vehicle is disclosed. The device has a first refrigerant fluid loop (A) with a compressor, a two-fluid heat exchanger, a first expansion device, an evaporator, a second expansion device, an evaporator/condenser, and a first by-pass line including a first stop valve, a first and a second internal heat exchanger. A second by-pass line includes a third expansion device arranged upstream from a cooler, a shunt branch comprising a first external radiator. The device also has a second heat transfer fluid loop (B) in which a heat transfer fluid is intended to flow. The two-fluid heat exchanger is arranged jointly on the one hand on the first refrigerant fluid loop downstream of the compressor, between said compressor and the first expansion device, and on the second heat transfer fluid loop (B).

A heat control device is provided in a vehicle including a first thermal circuit that circulates a coolant and a second thermal circuit that circulates a refrigerant while changing the state of the refrigerant and is able to exchange heat with the first thermal circuit. When there is a heat discharge request from the second thermal circuit, the heat control device includes a determination unit configured to determine an amount of operation of each of a plurality of units which are used to discharge heat such that the heat discharge request is satisfied and the sum of power consumption values of the plurality of units is minimized.

A heat pump system for a vehicle utilizes one chiller in which a coolant and a refrigerant are heat-exchanged to adjust a temperature of a battery module, and utilizes a sub-centralized energy module with waste heat of an electrical component in a heating mode of the vehicle to improve heating efficiency.

A heat pump system for a vehicle utilizes one chiller in which the coolant and the refrigerant are heat-exchanged to heat or cool a battery module. In addition, the heating efficiency is improved by selectively using the external heat and the waste heat of the electrical component and the battery module in the heating mode of the vehicle, wherein the electrical component is mounted on the coolant line connected to on the cooling apparatus of the heat pump system.

A vehicle air conditioner having a compressor to compress a refrigerant, an air flow passage to supply air to the vehicle; a radiator; an outdoor heat exchanger; a battery temperature adjustment device for letting a heat medium circulate through a battery mounted in the vehicle, thereby adjusting a temperature of the battery; and a control device. The battery temperature adjustment device has a refrigerant-heat medium heat exchanger for performing exchange of heat between the refrigerant and the heat medium. The control device is configured to execute: a radiator and outdoor heat exchanger heating/battery cooling mode, and an obstruct inflow heating/battery cooling mode.