A transport refrigeration system is configured to set a first path, a second path, a third path, and fourth path selectively. The first path connects compressors in series. In the first path, interior heat exchangers each serve as an evaporator. The second path connects the compressors in series. In the second path, the interior heat exchangers each serve as a condenser. The third path connects the compressors in parallel. In the third path, at least one of the interior heat exchangers serve as the evaporator and the rest of the interior heat exchangers serve as the condenser. The fourth path connects the compressors in parallel. In the fourth path, the interior heat exchangers each serve as the condenser.

An outdoor unit (100) for a VRF air conditioning system and a VRF air conditioning system having the same are provided. The outdoor unit (100) comprises: a compressor (10); a reversing assembly (20); an outdoor heat exchanger (30) comprising an header (31), an heat exchange portion (32), a plurality of flow-distribution capillary tubes (33) and a flow distributor (34); an electronic expansion valve (40) connected to the flow distributor (34); an refrigerant flow path (50) and an adjusting valve assembly (60), in which the refrigerant flow path (50) is connected to the electronic expansion valve (40), and the adjusting valve assembly (60) is connected to the refrigerant flow path (50) in series; a reversing valve assembly (70) configured to make the refrigerant flow out of the outdoor unit (100) via the second stop valve (120), and make the refrigerant flow into the outdoor unit (100) via the first stop valve (110).

A medical contact shock freezer (10) adapted for fast freezing a plurality of individual bags containing a medical liquid, notably blood plasma, the medical contact shock freezer comprising:a first pair of freezing plates (11), at least one of the freezing plates of the first pair of freezing plates being moveable between i) a loading position of the freezing plates in which sufficient separation is provided between the freezing plates to load or unload the individual bags between the freezing plates and ii) a freezing position in which the individual bags arranged between the freezing plates are clamped between the freezing plates; anda first refrigeration circuit (15) configured when in a refrigeration mode to remove heat from the first pair of freezing plates to freeze the individual bags clamped between the first pair of freezing plates; in whichthe first refrigeration circuit comprises a cascade refrigeration circuit comprising a first stage refrigeration circuit (S1), a second stage refrigeration circuit (S2) and an inter-stage heat exchanger (17).

A refrigerant cycle system includes: a first refrigerant circuit that includes a first heat exchanger, a first compressor, and a first cascade heat exchanger and that is configured as a first vapor compression refrigeration cycle; a second refrigerant circuit that includes the first cascade heat exchanger, a second compressor, and a second heat exchanger and that is configured as a second vapor compression refrigeration cycle; a first unit that accommodates the first heat exchanger and the first compressor; a second unit that accommodates the first cascade heat exchanger and the second compressor; and a third unit that accommodates the second heat exchanger. The first unit, the second unit, and the third unit are disposed apart from each other. The first cascade heat exchanger performs heat exchange between a first refrigerant that flows through the first refrigerant circuit and a second refrigerant that flows through the second refrigerant circuit.

Provided is a air conditioner including high-and-low-pressure gas pipe expansion valves each of which is provided to a corresponding one of the cooling-heating switching units and adjusts feeding of high-temperature and high-pressure gas refrigerant to the corresponding indoor unit; and a refrigeration cycle controller which adjusts a valve opening degree of the high-and-low-pressure gas pipe expansion valve of the cooling-heating switching unit connected to one of the indoor units which is not in heating operation, in accordance with a determination result on excess or deficiency of refrigerant in a refrigeration cycle.

An outdoor device for an air conditioner is provided that may include a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed in the compressor, an expansion device that decompresses the refrigerant condensed in the condenser, an evaporator that evaporates the refrigerant decompressed in the expansion device, and a refrigerant storage that bypasses at least a portion of the refrigerant condensed in the condenser to store the bypassed refrigerant therein. The refrigerant storage may include a first storage that stores the bypassed refrigerant, and a second storage in which the refrigerant passing through the evaporator is introduced. The second storage may discharge a gaseous refrigerant of the introduced refrigerant to the compressor. The first storage may be provided above the second storage to supply the refrigerant stored therein into the second storage.

A refrigeration cycle device includes a compressor, an air-refrigerant heat exchanger that exchanges heat between air and refrigerant, an expansion valve decompressing the refrigerant, a heat medium-refrigerant heat exchanger that exchanges heat between a heat medium and the refrigerant, a cold-heat utilization device that utilizes cold heat of the heat medium, and a hot-heat utilization device that utilizes hot heat of the heat medium. A refrigerant flow switching valve is provided to switch between a heat-medium cooling mode of cooling the heat medium in the heat medium-refrigerant heat exchanger, and a heat-medium heating mode of heating the heat medium in the heat medium-refrigerant heat exchanger. In addition, a heat medium flow switching device is provided such that, in the heat-medium cooling mode, the heat medium circulates between the heat medium-refrigerant heat exchanger and the cold-heat utilization device, and that in the heat-medium heating mode, the heat medium circulates between the heat medium-refrigerant heat exchanger and the hot-heat utilization device.

A heat recovery system includes a compressor, a solar panel, and a first heat exchanger and a second heat exchanger in fluid connection to form a closed circuit. The compressor is configured to facilitate fluid movement in the fluid circuit between the solar panel, the first heat exchanger and the second heat exchanger. The solar panel includes a plurality of solar cells connected in parallel, and each solar cell includes a plurality of metal tubes for fluid to pass through. A temperature sensor is mounted within each of the solar cells and configured to measure temperature inside the respective solar cell. Each solar cell is connected to the circuit via a respective pressure valve, and the status of the pressure valve is configured to depend on the measurement of the temperature sensor in the respective solar cell.

A regenerative air-conditioning apparatus includes a thermal energy storage unit, first and second valve devices for switching a flow direction of a refrigerant compressed in a compressor, a first branch part disposed on an outlet-side of the compressor, the first branch dividing the refrigerant compressed in the compressor to flow into first and second valve devices or the thermal energy storage unit, a first storage unit connection tube extending from the first branch part to the thermal energy storage unit, a condensed refrigerant tube extending from an outdoor heat exchanger to an indoor heat exchanger, a second storage unit connection tube extending from the thermal energy storage unit to the condensed refrigerant tube, and a first expansion device disposed in the first storage unit connection tube to selectively restrict a flow of the refrigerant from the first branch part to the thermal energy storage unit.

An air conditioner of the present disclosure includes one or more outdoor units comprising a compressor and an outdoor heat exchanger which exchanges heat between a refrigerant flowing through the compressor and external air; and a plurality of indoor units which are connected to the outdoor unit, and have an indoor heat exchanger, wherein the plurality of indoor units include a first indoor unit group and a second indoor unit group, wherein the outdoor unit and the first indoor unit group are connected by a first gas pipe and a liquid pipe, and wherein the outdoor unit and the second indoor unit group are connected by a second gas pipe and the liquid pipe.