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.

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 heat pump includes a refrigerant loop. The refrigerant loop includes a compressor, a first condenser, a vapor generator having a first region and a second region, a first expansion valve, a second expansion valve, and a first evaporator. A branching point is positioned between the first condenser and the vapor generator. The branching point diverts a portion of a first heat exchange fluid circulating through the refrigerant loop to the vapor generator. The first expansion valve is positioned between the branching point and the vapor generator. An outlet vapor generator is coupled to a mid-pressure inlet port of the compressor.

A heat pump includes a refrigerant loop. The refrigerant loop includes a compressor, a first condenser, a vapor generator having a first region and a second region, a first expansion valve, a second expansion valve, and a first evaporator. A branching point is positioned between the first condenser and the vapor generator. The branching point diverts a portion of a first heat exchange fluid circulating through the refrigerant loop to the vapor generator. The first expansion valve is positioned between the branching point and the vapor generator. An outlet vapor generator is coupled to a mid-pressure inlet port of the compressor.

The present invention is directed at a thermal expansion valve for a residential refrigeration application, including a valve body with a high pressure inlet, a low pressure outlet, a first suction gas port and a second suction gas port. The valve further includes a superheat defining mechanism with a diaphragm, a pushpin and a charge.

The present invention is directed at a thermal expansion valve for a residential refrigeration application, including a valve body with a high pressure inlet, a low pressure outlet, a first suction gas port and a second suction gas port. The valve further includes a superheat defining mechanism with a diaphragm, a pushpin and a charge.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat has fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat has fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat of fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

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.