An air-conditioning apparatus includes a heat medium circuit in which a compressor, a flow switching unit, a flow regulating unit, a gas header, a heat source-side heat exchanger, a distributor, an expansion unit, and a use-side heat exchanger are connected by a pipe, and during a defrosting operation to defrost the heat source-side heat exchanger, heat medium circulates, in order, the compressor, the flow switching unit, the gas header, the heat source-side heat exchanger, the distributor, the expansion unit, and the use-side heat exchanger. The heat source-side heat exchanger includes a first heat exchange unit, and a second heat exchange unit provided lower than the first heat exchange unit. The flow regulating unit is configured to, during the defrosting operation, regulate a flow rate of heat medium flowing through the first heat exchange unit and a flow rate of heat medium flowing through the second heat exchange unit.

In a refrigerator according to the present disclosure, even if the temperature of a hot gas flow path through which a high-temperature refrigerant flows gradually decreases due to heat exchange while passing through an evaporator, the hot gas flow path is provided with heat from a heating source and reheated by a heat transfer member, sufficient heat may be provided until the hot gas completely passes through the evaporator.

A system for cooling and controlling a cooling system having a variable speed compressor, a condenser, a variable flow regulator, a metering device, an evaporator, and a refrigerant. The system includes controlling the speed of the variable speed compressor by transmitting a control signal to the variable speed compressor such that the speed of the variable speed compressor is based on the control signal and lowering the speed of the variable speed compressor results in a lower flow rate of the refrigerant and thus a reduced rate of cooling. The system also includes selectively opening or closing the variable flow regulator such that a closed variable flow regulator restricts the flow of the refrigerant through the evaporator and thus reduces the rate of cooling.

This invention relates to of a cooling device (1) comprising a compressor (2) which compresses the refrigerant fluid, a condenser (3) which enables the superheated vapor exiting the compressor (2) change to first a liquid-vapor phase then liquid phase entirely, a compressor cabinet (8) positioned separately from the cooling cabinet (7), into which the compressor (2) and the condenser (3) are positioned, one or more evaporators (4), and one or more capillary tubes (5) interposed between the compressor cabinet (8) and the evaporator (6), and a control method thereof.

A refrigerator that includes a compressor configured to compress a refrigerant; a condenser configured to condense the refrigerant; a first evaporator that is configured to evaporate the refrigerant, the evaporated refrigerant being configured to cool a refrigerating compartment; a second evaporator that is configured to evaporate the refrigerant, the evaporated refrigerant being configured to cool a freezing compartment; a first heat exchanger; a refrigerating-compartment expansion device that is coupled to the first heat exchanger and that is configured to expand the refrigerant and provide the expanded refrigerant to the first heat exchanger; a second heat exchanger coupled to the second evaporator; and a freezing-compartment expansion device that is coupled to the second heat exchanger and that is configured to expand the refrigerant and provide the expanded refrigerant to the second heat exchanger, wherein the first heat exchanger is configured to cool the second heat exchanger is disclosed.

An HVAC system having a fixed orifice expansion device coupled to an evaporator coil is provided. In one embodiment, an expansion device coupled to an evaporator coil includes a flow restrictor and an evaporator inlet manifold. The flow restrictor includes multiple fixed orifices aligned with the refrigerant distribution tubes to restrict flow of refrigerant from the evaporator inlet manifold into the refrigerant distribution tubes through the multiple fixed orifices. Additional systems, devices, and methods are also disclosed.

An HVAC system having a fixed orifice expansion device coupled to an evaporator coil is provided. In one embodiment, an expansion device coupled to an evaporator coil includes a flow restrictor and an evaporator inlet manifold. The flow restrictor includes multiple fixed orifices aligned with the refrigerant distribution tubes to restrict flow of refrigerant from the evaporator inlet manifold into the refrigerant distribution tubes through the multiple fixed orifices. Additional systems, devices, and methods are also disclosed.

A refrigerator including a main body having a storage chamber and a cold air supply device configured to supply cold air to the storage chamber, wherein the cold air supply device includes a compressor, a condenser configured to condense a refrigerant compressed by the compressor, a flow path switching valve connected to the condenser, a first capillary tube and a second capillary tube connected to the flow path switching valve, respectively, the second capillary tube arranged in parallel with the first capillary tube, and a cluster pipe arranged between the flow path switching valve and the first capillary tube to further condensate the refrigerant pass therethrough. The flow path switching valve is configured to selectively allow the refrigerant received from the condenser to flow into the first capillary tube or the second capillary tube.

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 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).