An evaporator apparatus for a refrigeration cycle of an HVAC system or a refrigeration system is disclosed that includes: a primary evaporator pathway for a working fluid of the refrigeration cycle extending through a primary expansion device and a primary evaporator; a secondary evaporator pathway for the working fluid in parallel with the primary evaporator pathway and extending through a secondary expansion device and a secondary evaporator; a coolant circuit for cooling a device, the secondary evaporator configured for heat exchange between the working fluid and process fluid of the coolant circuit; and a controller configured to control: the primary expansion device to maintain a target superheat of working fluid at a primary control location downstream of the primary evaporator; and the secondary expansion device based on monitoring a temperature of process fluid to maintain a target temperature of process fluid at a coolant control location in the coolant circuit.

A heating, ventilation, and air conditioning (HVAC) system includes a hot water sub-system including a first heat exchanger and a condenser, a cold water sub-system including a second heat exchanger and an evaporator, and a refrigerant sub-system for transferring heat from the cold water sub-system to the hot water sub-system. The first and second heat exchangers transfer moisture and heat between a liquid desiccant and air. The refrigerant sub-system includes a compressor, the condenser, an expansion valve, the evaporator, and a refrigerant-air heat exchanger. The condenser transfers heat from compressed refrigerant to the hot water sub-system. The evaporator transfers heat from the cold water sub-system to uncompressed refrigerant. The refrigerant-air heat exchanger transfers heat from a portion of the compressed refrigerant to air in a first operating mode, and transfers heat from the air to a portion of the uncompressed refrigerant in a second operating mode.

A refrigerant/heat medium heat exchanger that heats a heat medium which circulates in a heater core of an HVAC unit is provided in a discharge pipe of a cooling refrigerant circuit, a heating bypass circuit that extends to a receiver is connected to a downstream side of the refrigerant/heat medium heat exchanger through a switching means, a second circuit having a second decompression means is provided between an outlet of the receiver and a first end of a vehicle exterior heat exchanger, and a third circuit having a solenoid valve is provided between a second end of the vehicle exterior heat exchanger and an intake circuit. In a vehicle air-conditioning system, a heating refrigerant circuit is configured by an electric compressor, a refrigerant/heat medium heat exchanger, a switching means, a heating bypass circuit, a receiver, a second circuit, a vehicle exterior heat exchanger, and a third circuit. Consequently, while simplification of a configuration and the like are attained by diverting cooling refrigerant circuit and an HVAC of a current system, cooling/heating capacity can be ensured by diversifying heating heat sources, and operation in a frost formation delay mode or the like is possible during heating.

A heat-pump-type vehicular air-conditioning that includes a cooling refrigerant circuit. The circuit has a base for connecting an onboard condenser provided on the downstream side of an onboard evaporator inside an HVAC unit. The circuit includes a second decompression unit between the outlet side of a receiver and one end side of a vehicle-mounted external heat exchanger. Also included is a second circuit having a solenoid valve opened during heating between the other end side of the vehicle-mounted external heat exchanger and the intake circuit of an electric compressor. The vehicular air-conditioning system being provided with a heating refrigerant circuit in which the electric compressor, a switching unit, the onboard condenser, the receiver, the first circuit, the vehicle-mounted external heat exchanger, and the second circuit are connected in the stated order.

A valve apparatus includes a valve main body, a shaft body, a first valve element, and a second valve element. The valve main body has a first depressed portion and a second depressed portion in a circular shape, and a first port, a second port, and a third port each communicating with the first depressed portion, and a fourth port and a fifth port each communicating with the second depressed portion. The first port is allowed to selectively communicate with one of the second port and the third port by closure of one of the second port and the third port by the first valve element rotating about an axial direction. A flow amount of a fluid flowing between the fourth port and the fifth port is allowed to be variable by closure of the fourth port by the second valve element rotating about the axial direction.

Switching valve for controlling a mass flow in a cold or hot circuit. The valve includes a valve housing having a feed opening and a discharge opening; a valve piston which has a valve-closure member directed towards the discharge opening and which, in a closed position, abuts a valve seat of a through-bore between the feed opening and the discharge opening; a pilot valve having a pilot bore in the valve piston, which bore opens into the through-bore and traverses the valve piston; a path-generating device having an actuatable ram accommodating a closure member which closes the pilot bore and, with the closure member, can be moved into an opening position which opens the pilot bore; and a bypass duct formed between the feed opening and the pilot bore. At least one connection element forcibly transfers at least some of the stroke movement of the ram onto the valve piston.

A thermal system may include a vapor compression refrigeration circuit conducting a first refrigerant, an absorption refrigeration circuit conducting a second refrigerant and an absorbent, and a heat exchanger unit. The vapor compression refrigeration circuit may include a first heat rejection heat exchanger, a first heat absorption heat exchanger, a compressor disposed between the first heat absorption heat exchanger and the first heat rejection heat exchanger, and an expansion valve disposed between and connected to the first heat rejection heat exchanger and the first heat absorption heat exchanger. The absorption refrigeration circuit may include a generator, an absorber, a pump disposed between and connected to the absorber and the generator, a throttling valve disposed between and connected to the generator and the absorber, a second heat rejection heat exchanger connected to the generator, and a second heat absorption heat exchanger connected to the absorber. The generator and the first heat rejection heat exchanger may be integrated with one another within the heat exchanger unit such that heat emitted by the first heat rejection heat exchanger is transferred to the generator.

A thermal system may include a vapor compression refrigeration circuit conducting a first refrigerant, an absorption refrigeration circuit conducting a second refrigerant and an absorbent, and a heat exchanger unit. The vapor compression refrigeration circuit may include a first heat rejection heat exchanger, a first heat absorption heat exchanger, a compressor disposed between the first heat absorption heat exchanger and the first heat rejection heat exchanger, and an expansion valve disposed between and connected to the first heat rejection heat exchanger and the first heat absorption heat exchanger. The absorption refrigeration circuit may include a generator, an absorber, a pump disposed between and connected to the absorber and the generator, a throttling valve disposed between and connected to the generator and the absorber, a second heat rejection heat exchanger connected to the generator, and a second heat absorption heat exchanger connected to the absorber. The generator and the first heat rejection heat exchanger may be integrated with one another within the heat exchanger unit such that heat emitted by the first heat rejection heat exchanger is transferred to the generator.

A first valve member switches between a first communication state, in which a first inlet passage communicates with a first outlet passage and a second inlet passage is closed, and a second communication state, in which the second inlet passage communicates with the first outlet passage and the first inlet passage is closed. A second valve member switches between an opening state and a throttle state in which a smaller volume of a fluid flows from the third inlet passage to the second outlet passage as compared to the opening state. A valve driving member switches between a first operation state, in which the first valve member sets the first communication state and the second valve member sets the opening state, and a second operation state, in which the first valve member sets the second communication state and the second valve member sets the throttle state.

A vapor-compression system includes a centrifugal compressor configured to increase a pressure of a refrigerant based on at least one of an activation of a device or the device being equal to or above a first threshold temperature. A fluid communication system is configured to provide, to the device, a portion of the refrigerant in a liquid state. The portion of the liquid refrigerant in a liquid state is configured to have a saturation temperature equal to or below the first temperature threshold.