A heat pump system includes a refrigerant circuit that has a compressor, a first heat exchanger, a second heat exchanger, a reheat heat exchanger, a modulating valve, and a reversing valve. The reversing valve is configured to transition between a first configuration to direct refrigerant from the compressor toward the modulating valve and a second configuration to direct the refrigerant from the compressor toward the first heat exchanger. The heat pump system also includes control circuitry configured to concurrently maintain the reversing valve in the first configuration and adjust a position of the modulating valve to direct a first portion of the refrigerant from the modulating valve to the second heat exchanger and a second portion of the refrigerant from the modulating valve to the reheat heat exchanger based on an operating mode of the heat pump system.

A refrigeration system includes a refrigerated cavity, a first compression system, and a second compression system. The refrigeration system further includes a controller configured to operate the refrigeration system in a first mode in which the first compression system and the second compression system operate to cool the refrigerated cavity. The refrigeration system is further configured to selectively operate the refrigeration system in a second mode in which a refrigerant discharged from the second compressor is routed through the first evaporator to defrost the first evaporator.

In an air-conditioning, first flow passage selection device and a second flow passage selection device each are a constant-energized-type three-way valve in which a position of a main valve can be fixed in a de-energized state. When the refrigerant circuit is switched to the cooling circuit by a flow switching device, when at least one of the first flow passage selection device and the second flow passage selection device is in a de-energized state, the first flow passage selection device or the second flow passage selection device in the de-energized state is configured to output refrigerant discharged from the compressor and input therein via the flow switching device and the bypass pipe to a corresponding one of an upper-side outdoor heat exchanger and a lower-side outdoor heat exchanger.

A two-pipe enhanced-vapor-injection outdoor unit and a multi-split system are provided. The two-pipe enhanced-vapor-injection outdoor unit includes: an outdoor heat exchanger and a second port; an enhanced-vapor-injection compressor, including a gas discharge port, a gas return port and an injection port; a reversing assembly, including first to fourth ends; a supercooler, including a main heat-exchange flow path and an auxiliary heat-exchange flow path communicated with each other, the main heat-exchange flow path being connected to the second port, the auxiliary heat-exchange flow path being connected to the injection port; and a throttling assembly having a first end connected to an outlet of the main heat-exchange flow path, and a second end connected to an inlet of the outdoor heat exchanger.

A two-pipe enhanced-vapor-injection outdoor unit and a two-pipe enhanced-vapor-injection multi-split system are provided. The two-pipe enhanced-vapor-injection outdoor unit includes an outdoor heat exchanger (10), an enhanced-vapor-injection compressor (16), a reversing assembly (18), a super cooler (20), a throttling assembly (22) and a first pipe (24). The reversing assembly (18) includes a first end and a second end connected with a gas discharge port (162) and a gas return port (164), respectively. A main heat-exchange flow path is connected with the first port (12) and the second port (14), respectively. An auxiliary heat-exchange flow path is connected with the injection port (166). The throttling assembly (22) includes two ends connected with an outlet of the main heat-exchange flow path and an inlet of the outdoor heat exchanger (10). The first pipe (24) includes a first end connected with an outlet of the outdoor heat exchanger (10), and a second end arranged between the throttling assembly (22) and the main heat-exchange flow path.

Modular heating and cooling systems may include one or more modules connected to a fluid input and fluid output. Conventional modular heating and cooling systems typically use a single fluid in the cooling, heating and source fluid loops due to the mixing of fluids in the system. According to an aspect there is provided a modular heating system comprising at least one heating and cooling apparatus. The apparatus comprises a first heat exchanger, a second heat exchanger and a third heat exchanger. The apparatus further comprises a refrigerant line system coupled to the first (e.g. cooling), second (e.g. heating) and third (e.g. source) heat exchangers and configurable for selectively directing refrigerant fluid through the heat exchanger to provide multiple modes of operation. The heating, cooling and source fluid loops may be separate and independent such that the fluids do not mix.

A liquid slug reduction and charge compensator device for use in air conditioning and heat pump systems includes a housing having a cavity. The housing includes an inlet port providing an entry path into the cavity and an outlet port providing an exit path from the cavity. The housing further includes a liquid line port providing a refrigerant pathway into and out of the cavity. The liquid slug reduction and charge compensator device further includes a flash tube extending through the cavity and providing a passageway through the cavity such that a hot gas refrigerant that enters the cavity through the inlet port causes a liquid refrigerant that enters the flash tube to evaporate.

A heat pump system includes a refrigerant circuit that has a compressor, a first heat exchanger, a second heat exchanger, a reheat heat exchanger, a modulating valve, and a reversing valve. The reversing valve is configured to transition between a first configuration to direct refrigerant from the compressor toward the modulating valve and a second configuration to direct the refrigerant from the compressor toward the first heat exchanger. The heat pump system also includes control circuitry configured to concurrently maintain the reversing valve in the first configuration and adjust a position of the modulating valve to direct a first portion of the refrigerant from the modulating valve to the second heat exchanger and a second portion of the refrigerant from the modulating valve to the reheat heat exchanger based on an operating mode of the heat pump system.

Modular heating and cooling systems may include one or more modules connected to a fluid input and fluid output. A modular heating system includes at least one heating and cooling apparatus. The apparatus includes a first heat exchanger, a second heat exchanger and a third heat exchanger. The apparatus further includes a refrigerant line system coupled to the first (e.g. cooling), second (e.g. heating) and third (e.g. source) heat exchangers and configurable for selectively directing refrigerant fluid through the heat exchanger to provide multiple modes of operation. The heating, cooling and source fluid loops may be separate and independent such that the fluids do not mix.

A heat exchanger for regulating the temperature of objects includes two coolant ports that can interchangeably serve as either a coolant inlet or a coolant outlet. The heat exchanger includes sealedly engaged top, middle, and bottom plates that form passageways that distribute coolant through the heat exchanger. A top manifold is formed between the top and middle plates and is fluidly coupled with a first port, while a bottom manifold is formed between the bottom and middle plates and is fluidly coupled with a second port. The top and bottom manifolds are configured such that, during operation, coolant can be directed from the first port to the second port, or vice versa, thereby enabling the heat exchanger to operate bidirectionallywithout materially affecting the temperature regulation effects of the heat exchanger. In this manner, the same heat exchanger construction can be used in multiple orientations within a thermal management system.