A work machine includes a tank of secondary battery coolant to act as a heat sink to cool a secondary battery. When a power unit is available for use to provide electrical power to the work machine, a secondary battery cooling system is used. The secondary battery cooling system includes a tank used to store secondary battery coolant. The secondary battery coolant stored in the tank is maintained within a temperature range using the refrigerant of an HVAC system that used to cool the cab of the work machine. When the power unit is available for use, the HVAC system is fluidically disconnected from cooling the secondary battery coolant stored in the tank. Thereafter, the secondary battery is cooled using the secondary battery coolant stored in the tank. Thus, the secondary battery coolant stored in the tank acts as a heat sink to remove heat from the secondary battery until the power unit is available for use.

A first expansion valve is provided in a first refrigerant circulation passage through which the refrigerant discharged from a compressor is able to circulate by passing sequentially through an external heat exchanger and an evaporator and returning to the compressor. A second expansion valve is provided in a second refrigerant circulation passage through which the refrigerant discharged from the compressor is able to circulate by passing sequentially through an auxiliary condenser and the external heat exchanger and returning to the compressor. The second expansion valve regulates the valve opening degree such that the refrigerant state at an inlet side of the compressor during a heating operation is in a range where the dryness of refrigerant is greater than or equal to 0.9 and the superheat of refrigerant is less than or equal to 5 C.

A heat pump includes a refrigerant loop. The refrigerant loop includes a first heat exchanger, a first region of a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a compressor, a vapor generator, an accumulator, a first expansion valve, and a first three-way valve. The compressor includes a low-pressure inlet, a mid-pressure inlet, and an outlet. The vapor generator is positioned downstream of the outlet of the compressor and upstream of both the low-pressure inlet and the mid-pressure inlet. The accumulator is positioned immediately upstream of the compressor. The accumulator includes an inlet and an outlet. The first expansion valve is positioned upstream of the accumulator. The first expansion valve includes an inlet and an outlet. The first three-way valve is positioned immediately downstream of the first expansion valve and immediately upstream of the accumulator.

A method for controlling a thermal conditioning system includes a heat-transfer fluid circuit and a refrigerant circuit. The refrigerant circuit includes an electric compressor, a first heat exchanger, a first pressure reducer, a second heat exchanger, and a bypass branch for returning a refrigerant at the outlet of the compressor to the second exchanger and a second pressure reducer. The method includes receiving a thermal power setpoint for delivering thermal power to a heat-transfer fluid; determining an electrical power setpoint for delivering electrical power to the compressor; determining a suction pressure setpoint for the compressor; controlling a flow cross-section of the second pressure reducer so that the suction pressure of the compressor is equal to the determined suction pressure setpoint; and controlling a flow cross-section of the first pressure reducer so that the refrigerant at the inlet of the compressor is in the superheated vapour state.

A thermal system includes a high temperature coolant loop thermally coupled to a heater core configured for thermal exchange with an airflow into a cabin of the vehicle, and an air conditioning (A/C) loop having a compressor, a condenser, a first expansion device for a heat exchanger, a second expansion device for a chiller, and a third expansion device for an evaporator. The high temperature coolant loop is thermally coupled to the condenser. A controller includes one or more processors and is programmed to perform a window fogging prevention operation by controlling a speed of the compressor such that (i) a coolant temperature at the heater core reaches a first predetermined target temperature, and (ii) a coolant temperature at the evaporator does not fall below a second predetermined target temperature.

A method of controlling a climate control system is provided. The method includes receiving first temperature data from a first temperature sensor, the first temperature data including information indicative of a first temperature at a first zone. The method also includes comparing the first temperature to a first temperature threshold. Also, the method includes outputting a second electronic expansion valve control signal to cause a second electronic expansion valve to attain a required aperture size based on the comparison.

An embodiment relates to a manifold fluid module integrated with a gas-liquid separator. The manifold fluid module integrated with the gas-liquid separator according to the embodiment may include a manifold plate including a fluid passage formed internally, a heat exchanger coupled to the manifold plate for heat exchange between a first fluid and a second fluid, a first expansion valve coupled to the manifold plate and configured to block the flow of the first fluid or expand the first fluid based on air conditioning mode, and a gas-liquid separator at least partially integrally formed with the manifold plate to create an inflow space for the first fluid expanded by the first expansion valve and to separate the first fluid into gas and liquid phases.

A method for operating a refrigeration system with a heat pump function for a motor vehicle with an at least partially electric drive. The refrigeration system has a refrigerant compressor; a first heat exchanger; at least one further heat exchanger; a sensor device arranged upstream of the refrigerant compressor on the low-pressure side for detecting a first refrigerant pressure and/or a first refrigerant temperature; a sensor device arranged downstream of the refrigerant compressor on the high-pressure side for detecting a second refrigerant pressure and/or a second refrigerant temperature, the method includes detecting the first refrigerant pressure and/or the first refrigerant temperature; detecting the second refrigerant pressure and/or the second refrigerant temperature; detecting a speed of the refrigerant compressor; determining a refrigerant volumetric efficiency; and determining a refrigerant mass flow based on the refrigerant volumetric efficiency.

A method for operating a temperature-control device having a compressor line flowing a total mass flow of refrigerant and having a refrigerant compressor by which the refrigerant is conveyed and compressed, a condenser line branches off from the compressor line and flowing a first partial mass flow of the refrigerant, and having a first expansion valve to set and expand the first partial mass flow, and a condenser to condense the first partial mass flow arranged in the condenser line upstream of the first expansion valve. The refrigerant circuit includes a bypass line which is connected parallel to the condenser line and which branches off from the compressor line and through which a second partial mass flow of the refrigerant thus flows.

A heat pump system for a vehicle cools or heats the vehicle interior by using a natural refrigerant, and efficiently adjusts the temperature of a battery module by using a single chiller that exchanges heat between refrigerant and coolant.