Disclosed are an oil separation device (1283) and a condenser (130-1130) with an oil separation function, and a refrigeration system (100, 1200) using same. The oil separation device (1283) or the condenser (130-1130) comprises: a shell (201, 1301) comprising an oil separation cavity (315, 1315), a first refrigerant inlet (221, 1221), a second refrigerant inlet (222, 1222), a first flow guide channel (445-2145), and a second flow guide channel (446-2146), wherein refrigerant gas flowing through the two flow guide channels can be mixed. When the refrigeration system (100, 1200) comprises two compressors (108, 1208, 109, 1209) with different displacements, the requirement of filtering and separating a gaseous refrigerant and lubricating oil can be met without the need for designing the size of the oil separation cavity (315, 1315) in accordance with large-displacement compressors (109, 1209), and the size is small.

A heat exchanger includes: a heat exchange element including flat tubes spaced from each other; and a first header in which one end portion of each of the flat tubes is inserted. The first header includes: a first main header portion in which some of the flat tubes are inserted; a first sub-header portion in which others of the flat tubes are inserted such that the number of the flat tubes inserted in the first sub-header portion is smaller than that of the flat tubes inserted in the first main header portion; and a partition plate provided between the first main header portion and the first sub-header portion, and joined to the first main header portion and the first sub-header portion. The partition plate has a surface area that is larger than a sectional area of the first main header portion and a sectional area of the first sub-header portion.

A heat exchanger includes a first manifold, a second manifold, and a body including a plurality of heat exchange tube segments arranged in spaced parallel relationship and fluidly coupling the first manifold and the second manifold. At least one opening is formed in the body. The at least one opening extends through the body.

A heat exchanger includes a first manifold, a second manifold, and a body including a plurality of heat exchange tube segments arranged in spaced parallel relationship and fluidly coupling the first manifold and the second manifold. At least one opening is formed in the body. The at least one opening extends through the body.

A shell and plate heat exchanger includes a shell forming an internal space, and a plate stack housed in the internal space. The plate stack includes a plurality of heat transfer plates stacked and joined together. The shell and plate heat exchanger allows a refrigerant that has flowed into the internal space to be condensed. A refrigerant channel communicates with the internal space and allows the refrigerant to flow through. A heating medium channel is blocked from the internal space and allows a heating medium to flow through. The refrigerant channel and the heating medium channel are alternately arranged between adjacent heat transfer plates. A meandering portion is provided in at least a lower portion of the plate stack. The meandering portion is configured to meander the refrigerant condensed on a surface of each of the heat transfer plates. The meandering portion is provided by processing the heat transfer plates.

A shell and plate heat exchanger includes a shell forming an internal space, and a plate stack housed in the internal space. The plate stack includes a plurality of heat transfer plates stacked and joined together. The shell and plate heat exchanger allows a refrigerant that has flowed into the internal space to be condensed. A refrigerant channel communicates with the internal space and allows the refrigerant to flow through. A heating medium channel is blocked from the internal space and allows a heating medium to flow through. The refrigerant channel and the heating medium channel are alternately arranged between adjacent heat transfer plates. A meandering portion is provided in at least a lower portion of the plate stack. The meandering portion is configured to meander the refrigerant condensed on a surface of each of the heat transfer plates. The meandering portion is provided by processing the heat transfer plates.

A heating and cooling system that includes a condenser coil configured to receive a refrigerant. A first compressor and a second compressor that pump the refrigerant through the condenser coil. A first condenser fan and a second condenser fan that push air over the condenser coil. A controller that receives a signal indicative of an ambient air temperature, a signal indicative of an operational status of the first compressor, and a signal indicative of an operational status of the second compressor. The controller controls operation of the first condenser fan and the second condenser fan in response to the signal indicative of the ambient air temperature, the signal indicative of the operational status of the first compressor and the signal indicative of the operational status of the second compressor.

A heating and cooling system that includes a condenser coil configured to receive a refrigerant. A first compressor and a second compressor that pump the refrigerant through the condenser coil. A first condenser fan and a second condenser fan that push air over the condenser coil. A controller that receives a signal indicative of an ambient air temperature, a signal indicative of an operational status of the first compressor, and a signal indicative of an operational status of the second compressor. The controller controls operation of the first condenser fan and the second condenser fan in response to the signal indicative of the ambient air temperature, the signal indicative of the operational status of the first compressor and the signal indicative of the operational status of the second compressor.

An automatic constant-temperature dehumidification device, comprising at least two dehumidification heat pump assemblies having two refrigerant modules and an air module. The refrigerant module comprises a primary refrigerating module and a secondary refrigerating module, the primary refrigerating module and the secondary refrigerating module each comprising a condenser, an evaporator and a compressor. An air inlet pipe of the air module is connected to a hot side of a heat regenerator, the hot side of the heat regenerator is connected to the evaporators through ventilation pipes, the evaporators are connected to a cold side of the heat regenerator through ventilation pipes, and the cold side of the heat regenerator is connected to one of the condensers through a ventilation pipe.

An automatic constant-temperature dehumidification device, comprising at least two dehumidification heat pump assemblies having two refrigerant modules and an air module. The refrigerant module comprises a primary refrigerating module and a secondary refrigerating module, the primary refrigerating module and the secondary refrigerating module each comprising a condenser, an evaporator and a compressor. An air inlet pipe of the air module is connected to a hot side of a heat regenerator, the hot side of the heat regenerator is connected to the evaporators through ventilation pipes, the evaporators are connected to a cold side of the heat regenerator through ventilation pipes, and the cold side of the heat regenerator is connected to one of the condensers through a ventilation pipe.