Abstract: A refrigerating cycle apparatus is equipped with a plurality of outdoor units, each of which includes at least one high-pressure type compressor with refrigerant and lubricating oil stored therein. A discharge pipe of the respective compressor is connected to a main discharge pipe for jointly discharging refrigerant and oil to the indoor unit. A suction pipe of the respective compressors is connected for returning the refrigerant and the oil from the indoor unit to the compressor. Each outdoor unit comprises a first oil balancing circuit connected between a side surface of the casing of the respective compressor and the main discharge pipe for allowing a flowing-in of the exceeding oil from the casing of the compressor. In another embodiment, each outdoor unit may include a second oil balancing circuit connected between a side surface of the casing of the respective compressor and the main suction pipe.

Abstract: A heat exchanger includes: a plate-like fin having one end and an other end in a first direction; and a first heat transfer tube and a second heat transfer tube that each extends through the fin and that are adjacent to each other in a second direction. A portion to which the fin and the first heat transfer tube are connected and a clearance portion that separates between the fin and the first heat transfer tube are disposed between the fin and the first heat transfer tube. The clearance portion is disposed at one end side in the first direction relative to an imaginary center line that passes through a center of the first heat transfer tube in a long side direction and that extends along a short side direction.

Abstract: An auxiliary heat exchange unit of a heat exchanger has a first auxiliary heat exchange region and a second auxiliary heat exchange region. A main heat exchange unit has a first main heat exchange region, a second main heat exchange region, a third main heat exchange region, and a fourth main heat exchange region. The auxiliary heat exchange unit and the main heat exchange unit are configured to cause refrigerant to flow successively through the first auxiliary heat exchange region, the second auxiliary heat exchange region, the first main heat exchange region, the second main heat exchange region, the fourth main heat exchange region, and the third main heat exchange region when the heat exchanger functions as an evaporator.

Abstract: A method of operating an air conditioner unit to implement effective defrost cycles includes obtaining a coil temperature of an outdoor heat exchanger, a dew point of a flow of air through the outdoor heat exchanger, and a flow rate of the flow of air. A frost rate of frost buildup on the outdoor heat exchanger is estimated based on the coil temperature, the dew point, and the flow rate, and a frost quantity or weight is determined by integrating the frost rate. A defrost cycle is initiated if the frost quantity exceeds a predetermined frost threshold, e.g., in pounds of water.

Abstract: A transport refrigeration system (TRS) includes a first heat transfer circuit including a first compressor, a condenser, a first expansion device, and a cascade heat exchanger. The first compressor, the condenser, the first expansion device, and the cascade heat exchanger are in fluid communication such that a first heat transfer fluid can flow therethrough. The TRS includes a second heat transfer circuit including a second compressor, the cascade heat exchanger, a second expansion device, and an evaporator. The second compressor, the cascade heat exchanger, the second expansion device, and the evaporator are in fluid communication such that a second heat transfer fluid can flow therethrough. The first heat transfer circuit and the second heat transfer circuit are arranged in thermal communication at the cascade heat exchanger such that the first heat transfer fluid and the second heat transfer fluid are in a heat exchange relationship at the cascade heat exchanger.

Abstract: A refrigerant evaporator includes a first core, a second core, a first plate, and a second plate. The first core and the second core respectively include a plurality of first tubes and a plurality of second tubes extending along a tube longitudinal direction and stacked along a tube stacking direction. The first plate houses one end portions of the first tubes and the second tubes. The second plate faces the first core and the second core across the first plate and is joined to the first plate in the tube longitudinal direction. The second plate includes a plurality of ribs. The ribs and the first plate define a plurality of intermediate passageways therein. Each of the intermediate passageways allows communication between a corresponding one of the first tubes and a corresponding one of the second tubes.

Abstract: In a refrigeration system, a tube-and-fin heat exchanger has spaced fins that extend to an outer periphery of the heat exchanger and has smaller embedded fins in between or in a spaced relationship with each of the other fins. The embedded fins do not extend all the way to the outer periphery of the fins along the airside directions but have a shorter outer periphery such that there is an offset distance. Because of the offset distance, there is space that continues to provide room for fluid movement without fouling of the face of the heat exchanger and that provides an expected appearance while still having the benefit of additional fins elements further inside of the heat exchanger. Other exchangers and condensers are included.

Abstract: A heat-exchange apparatus is provided, including a first heat exchanger, a second heat exchanger, a third heat exchanger and a fourth heat exchanger. The first heat exchanger is thermally separated from the second heat exchanger. The third heat exchanger is thermally connected to the first heat exchanger. The fourth heat exchanger is thermally connected to the second heat exchanger, wherein a first air flow passes through the first heat exchanger and the second heat exchanger to be divided into a first divergent flow and a second divergent flow, the first divergent flow flows on a surface of the first heat exchanger, the second divergent flow flows on a surface of the second heat exchanger, the first divergent flow does not flow on the surface of the second heat exchanger, and the second divergent flow does not flow on the surface of the first heat exchanger.

Abstract: This refrigeration apparatus (1) includes a main refrigerant circuit (2) including a positive displacement compressor (4), a condenser (6), an expansion valve (8), and an evaporator (10), through which a refrigerant circulates successively in a closed loop circulation, and a lubrication refrigerant line (18) connected to the main refrigerant circuit (2) between the condenser (6) and the expansion valve (8) or to the condenser (6), in which circulates a portion of the refrigerant of the main refrigerant circuit (2) and connected to the compressor (4) for lubrication of said compressor (4) with the refrigerant. The refrigeration apparatus includes a lubrication refrigerant tank (20) connected to the lubrication refrigerant line (18) upstream the compressor (4), the lubrication tank (20) being configured to store liquid refrigerant for lubrication of the compressor (4) and the lubrication refrigerant tank (20) comprises means (32, 34; 38, 40) to cool down the refrigerant.

Abstract: A heat exchanger includes heat exchanger cores connected to a distributor. The inside of the distributor is divided into refrigerant flow paths, allowing the refrigerant to flow from one of the refrigerant flow paths to another one of the refrigerant flow paths. The heat transfer tubes of one of the heat exchanger cores disposed on a windward side of a flow of the air fed to the heat exchanger are connected to at least one of the refrigerant flow paths disposed in the distributor on an upstream side of a flow of the refrigerant. The heat transfer tubes of one of the heat exchanger cores disposed on a leeward side of the flow of the air fed to the heat exchanger are connected to at least one of the refrigerant flow paths disposed in the distributor on a downstream side of the flow of the refrigerant.

Abstract: Disclosed is an evaporator, comprising: a heating tube left as an empty space between first and second case sheets, which form an evaporator case, so as not to be overlapped with a cooling tube, and forming a heating passage in which a working liquid for defrosting flows; and a heater attached to the outer surface, which corresponds to the heating tube, of the evaporator case so as to heat the working liquid inside the heating tube. The heating tube can have a structure which an inlet and an outlet are respectively formed at both sides of a heater attachment part in the longitudinal direction and both end portions of a passage part are respectively connected to the inlet and the outlet, or can have a structure in which an opening is formed at one side of the heater attachment part, the working liquid heated by the heater is discharged through the opening, and the cooled working liquid is returned.

Abstract: A lubrication additive recovery system is provided for use with a vapor compression system. The vapor compression system includes a compressor having a bearing, a condenser and an evaporator. The lubrication additive recovery system includes a lubrication ring formed to define first and second through-holes, a first system by which a portion of a required supply of lubrication is drawn from the condenser and provided to the bearing through the first through-holes and a second system by which a remainder of the required supply of lubrication is recovered from the evaporator and provided along with compressor discharge gas to the bearing through the second through-holes.

Abstract: The present disclosure provides an air conditioner, a control strategy of the air conditioner and an air conditioning system. The air conditioner includes a compressor, a first heat exchanger, a phase-change thermal-storage heat exchanger, a throttling device and a box. The throttling device is provided between the first heat exchanger and the phase-change thermal-storage heat exchanger. One of the first heat exchanger and phase-change thermal-storage heat exchanger functions as an evaporator and the other functions as a condenser. The box includes an air supply port and an air return port. The compressor, the first heat exchanger, the phase-change thermal-storage heat exchanger and the throttling device are mounted in the box, thereby facilitating installation of the air conditioner.

Abstract: An evaporator includes an integral liquid suction heat exchanger that is disposed in a housing of the evaporator. The integral liquid suction heat exchanger is defined by an evaporator header of the evaporator and a portion of a liquid line that extends through an inner cavity defined by the evaporator header such that: (a) the evaporator header and the portion of the liquid line form a tube-in-tube structure, and (b) refrigerant from the evaporator coils that is channeled into the inner cavity of the evaporator header is superheated and converted to a vapor state in the evaporator header by heat from the refrigerant flowing through the liquid line. The refrigerant flowing through the liquid line is in a liquid state and has a higher temperature than the refrigerant from the evaporator coils that is in a two-phase state.

Abstract: Provided is a heat exchanger, including: a refrigerant distributor including: a gas-liquid separating portion having a function of separating a gas-liquid refrigerant mixture into a liquid refrigerant and a gas refrigerant; and a distributing portion provided to the gas-liquid separating portion. A plurality of heat transfer pipes connected to the distributing portion. The plurality of heat transfer pipes are arranged side by side in a first direction, and extend along a second direction intersecting with the first direction. When the refrigerant distributor is viewed along a direction orthogonal to each of the first direction and the second direction, a first space forming portion overlaps a region of the plurality of heat transfer pipes. When the refrigerant distributor and the heat transfer pipes are viewed along the first direction, a clearance is present between the gas-liquid separating portion and the heat transfer pipes.

Abstract: An air-conditioner outdoor heat exchanger has a fin, multiple heat transfer pipes thermally connected to the fin, having a flat sectional shape, and configured such that refrigerant flows through header pipes connected to inlet and outlet sides of the heat transfer pipes. The refrigerant flows through the heat transfer pipes in parallel, and when the refrigerant returns from the outlet-side header pipe to the inlet-side header pipe through the heat transfer pipes, the refrigerant returns to the inlet-side header pipe through one of the heat transfer pipes adjacent to another one of the heat transfer pipes through which the refrigerant has flowed when flowing from the inlet-side header pipe to the outlet-side header pipe. At least two systems of refrigerant paths are formed, and the refrigerant flows back and forth in each system between the inlet-side header pipe and the outlet-side header pipe.

Abstract: A compressor system includes at least two compressors. A suction equalizing tube fluidly couples the at least two compressors. A plumbing assembly fluidly couples to the first compressor and the second compressor. The plumbing assembly comprises an outlet to each compressor of the at least two compressors. A pressure differential between the at least two compressors is created so as to facilitate maintenance of a desired fluid level in the at least two compressors.

Abstract: An outdoor unit for a central air conditioner and a central air conditioner having the same are provided. The outdoor unit includes a unit body and at least One panel. One side of the unit body is open, and the panel is arranged on the side of the unit body to open and close the unit body. One end of the panel is pivotally and detachably connected to the unit body through a pivot structure. The pivot structure includes a base provided on the unit body and a pivot seat provided on the panel. A top of the base has a pivot shaft spaced apart from the unit body and extending upward, and the pivot seat is provided with a pivot hole having an open bottom and configured to be detachably fitted with the pivot shaft.

Abstract: A split heating, ventilation, and air-conditioning (HVAC) assembly for a motor vehicle is disclosed. The split HVAC includes a first sub-assembly comprising an evaporator and a first airflow space, a second sub-assembly comprising a second airflow space, a single sealing element located between a wall and one of the first sub-assembly or the second-sub-assembly, and a first interfacing element that directly connects the first sub-assembly and the second sub-assembly. The single sealing element and the first interfacing element prevent any airflow leakage from both the first sub-assembly and the second sub-assembly, and one of the first sub-assembly and the second sub-assembly extends partially into the other of the first sub-assembly and the second sub-assembly.

Abstract: An oil separator includes a separation container. The separation container has a side surface portion to which an inlet pipe is attached. The separation container has an upper surface portion to which an outlet pipe is attached. An oil reservoir is provided in a lower portion of the separation container. The separation container has a lower surface portion to which an oil return pipe is attached. The separation container has an inner wall surface provided with a liquid passage section. The liquid passage section is provided with a groove. The groove is disposed to extend in a direction of gravity toward the oil reservoir. The groove is formed to be gradually increased in depth from an upper portion of the groove toward a lower portion thereof.