Abstract:
An air conditioning refrigerant circuit (6) includes an engine-driven compressor (7) and an electric compressor (11), which are arranged in parallel. When the engine is running, the engine-driven compressor (7) is used. When the engine stops, e.g., when idling stops, the electric compressor (11) is used. At the startup of the engine by a manual operation such as ignition by a key, the engine-driven compressor (7) is kept at rest and instead, the electric compressor (11) is operated for a predetermined time. After the predetermined time, the engine-driven compressor (7) is operated. In this way, the oil recovery to the electric compressor is promoted.
Abstract:
A refrigerant circuit for a vehicle air conditioning system with heat pump function includes at least one evaporator, a compressor, and a condenser. The refrigerant circuit for the vehicle air conditioning system further includes an expansion element. A supplemental evaporator is arranged upstream from the compressor in a separate fluid guiding arrangement in the refrigerant circuit.
Abstract:
Cooling of a battery pack of an electrified vehicle is performed with an optimized energy usage and with minimal impact on cooling of the passenger cabin. Refrigerant from a condenser in an air conditioning system is evaporated in a front evaporator to cool a main air flow in a front cabin zone. The refrigerant is evaporated in a coolant chiller to cool a liquid coolant. The liquid coolant is pumped from the chiller to a rear exchanger to cool a rear air flow in a rear cabin zone. The liquid coolant is pumped from the chiller to the battery when a battery temperature and an ambient air temperature correspond to an active cooling mode. The coolant is pumped between the battery and a passive radiator instead of the chiller when the battery coolant temperature and the ambient air temperature correspond to a passive cooling mode.
Abstract:
A vehicle having a heating, ventilation and air conditioning (HVAC) system for heating and cooling a passenger compartment is provided. The vehicle may be described as including a CO2 loop positioned within an engine compartment, a coolant loop positioned at least partially within the passenger compartment, a first heat exchanger positioned within the engine compartment for transferring heat from a coolant within the coolant loop to a CO2 within the CO2 loop, a pump for moving the coolant within the coolant loop, a second heat exchanger within the coolant loop for heating or cooling an air temperature within the passenger compartment, and first and second valves for controlling movement of the coolant through the second heat exchanger and a heated coolant loop.
Abstract:
A vehicle includes a heating, ventilation and air conditioning (HVAC) system for heating and cooling a passenger compartment. The HVAC system includes a refrigerant loop operable in a cooling mode and a heating mode, and an auxiliary coolant loop for heating and cooling at least a portion of the passenger compartment. The auxiliary coolant loop includes a pump for moving a coolant, within the auxiliary coolant loop, through a first heat exchanger coupled to the refrigerant loop via an expansion device in the cooling mode, a second heat exchanger positioned within the passenger compartment, and a third heat exchanger coupled to the refrigerant loop, and a flow control valve. The temperature of the coolant within the auxiliary coolant loop is controlled utilizing the flow control valve and the pump. The first and third heat exchangers may be in parallel for controlling the movement of coolant therebetween to control temperature.
Abstract:
A vehicular heat pump system may have two inside heat exchangers within an HVAC module, and may operate in mild cooling and mild heating modes. In mild cooling mode, a first isolation valve and a second isolation valve are fully open and closed, respectively, to direct the refrigerant flow to the first inside heat exchanger only. In mild heating mode, the first isolation valve and the second isolation valve are fully closed and fully open, respectively, to direct the refrigerant flow to the second inside heat exchanger only. In both modes, a first metering device is partially open to control the flow and expansion of the refrigerant, and a second metering device is fully closed to prevent the refrigerant from flowing between the inside heat exchangers. This staged operation of the heat pump system may reduce the risk of flash fog as well as reduce discharge air temperature spreads.
Abstract:
A charge air cooler includes a first, second, and third heat exchange sections. In the first heat exchange section, heat is transferred from a first flow of liquid coolant to a refrigerant in order to cool the first flow of liquid coolant from a first temperature to a second temperature. In the second heat exchange section, heat is transferred from a flow of charge air to a second flow of liquid coolant in order to cool the flow of charge air from a third temperature to a fourth temperature. In the third heat exchange section, heat is transferred from the flow of charge air to the first flow of liquid coolant in order to cool the flow of charge air from the fourth temperature to a fifth temperature, the fifth temperature being less than the first temperature.
Abstract:
An air conditioner for a vehicle includes a cooler including a first radiator, a cooling fan sending air flow to the first radiator, a reservoir tank connected with the first radiator to store a cooling fluid, and a water pump circulating the cooling fluid. A water-cooled condenser is connected with the cooling line to condense superheated steam and a two-phase refrigerant, which includes gas and liquid, by heat exchange with the cooling fluid. An air-cooled condenser is connected with the water-cooled condenser through a refrigerant line in series to condense the refrigerant by heat exchanging with external air as the vehicle travels and to discharge the condensed refrigerant to a receiver drier.
Abstract:
A system and method for improving the operation of a cooling system and AC system for an engine, without sacrificing engine performance is disclosed. The system includes a cooling module positioned within an engine compartment of the vehicle, a cooling fan mounted in front of the cooling module, and a control strategy for controlling operation of the cooling fan based on engine conditions. The system includes incorporating at least one sensor, include a pressure sensor installed within the high pressure side of the AC system. The method includes providing an AC system having a high pressure side and a low pressure side, providing at least one sensor on the high pressure side for producing an electrical signal in response to an operating condition, determining which sensor has a highest electrical signal value for controlling the speed of the fan.
Abstract:
An air conditioning system for motor-vehicles includes a thermally controlled expansion valve unit for regulating the expansion of the fluid upstream of the evaporator, depending upon the temperature downstream of the evaporator. An intermediate heat exchanger provides a heat exchange between the conduit upstream of the evaporator and the conduit downstream of the evaporator. The expansion valve unit is arranged in such a way that its temperature sensor detects a temperature of the fluid along the conduit downstream of the evaporator at a portion of this conduit which is located downstream also with respect to the intermediate heat exchanger. A connecting flange is interposed between the evaporator and the thermally controlled expansion valve unit.