A heat exchanger having a plurality of first tubes and second tubes through which a refrigerant passes and which are lengthily formed up and down, each of the first and second tubes being spaced from each other and air flowing between the tubes; and a fin in contact with the first and second tubes, wherein the second tubes are spaced from each other and located at a slipstream of the first tubes in an air-flow direction, a first louver group having a plurality of louvers located between the first tubes and spaced from each other in the air-flow direction and a second louver group having a plurality of louvers located between the second tubes and spaced from each other in the air-flow direction are formed in the fin, wherein some of the louvers of the second louver group are longer toward the slipstream of the air-flow direction.

The present invention discloses a switchable two-stage and cascade marine energy-saving ultralow-temperature refrigeration system which comprises a high-temperature level refrigeration system, a low-temperature level refrigeration system, a hot fluorine defrosting system of a high-temperature level air cooler and a hot fluorine defrosting system of a low-temperature level air cooler. The hot fluorine defrosting system of the high-temperature level air cooler comprises a high-temperature level compressor of which the outlet is divided into two paths through a first oil separator; and the second path is connected with an air suction port of the high-temperature level compressor through a first solenoid valve, the high-temperature level air cooler, a third solenoid valve, a first pressure relief valve, a first gas-liquid separator, a first one-way valve and a first heat regenerator. The hot fluorine defrosting system of the low-temperature level air cooler comprises a low-temperature level compressor of which the outlet is divided into two paths through a precooler and a second oil separator; and the second path is connected with an air suction port of the low-temperature level compressor through an eighth solenoid valve, the low-temperature level air cooler, a sixth solenoid valve, a second pressure relief valve, a second gas-liquid separator, a third one-way valve and a second heat regenerator. The present invention has the obvious effects of large refrigeration section, high cooling rate, good energy-saving effect and thorough defrosting.

A refrigerant processing device includes a main body, and a pipe and a narrow tube that feed a refrigerant into and out of the main body. The main body has a cylindrical body part, and upper and lower end wall parts that close both ends of the cylindrical body part. The pipe passes through the lower end wall part, and extends along a central axis of the cylindrical body part. The narrow tube passes through the upper end wall part. A first spiral groove extending in a spiral shape with respect to the central axis is formed on an inner circumferential surface of the cylindrical body part. A second spiral groove extending in a spiral shape with respect to the central axis and a linear groove extending in a direction of the central axis are formed on an outer circumferential surface of the pipe.

A process to prevent fouling using a desublimating heat exchanger is disclosed. An outlet stream from the desublimating heat exchanger may be split into a plurality of parallel streams. The parallel streams may be sent through other devices for performing a unit operation, and the devices for performing a unit operation may change the temperature of at least one of the parallel streams. Parallel streams of differing temperature may emerge from the devices for performing a unit operation. The parallel streams of differing temperature may be sent to a mixing chamber. A mixed stream of uniform temperature may emerge from the mixing chamber, and the mixed stream may be recycled back to the desublimating heat exchanger. The mixing chamber may be separate from the desublimating heat exchanger, or the parallel streams of differing temperature may be mixed in the desublimating heat exchanger.

Example apparatus for regulator heat transfer are disclosed. An example apparatus includes a housing including an inlet, an outlet, a first valve, and a stem disposed therein. The example apparatus includes a vortex generator disposed in the housing. A fluid is to flow from the inlet through the vortex generator. The example apparatus includes a second valve disposed in the vortex generator. In the example apparatus, the vortex generator is to generate heat prior to the fluid flowing through the second valve to the outlet. The stem is to control the first valve and the second valve to regulate an amount of the heat conveyed to the first valve.

A refrigerant service system comprises a compressor having a compressor inlet and a compressor outlet, an inlet conduit, an outlet conduit, and an accumulator including an outer housing shell and an inner housing shell disposed within the outer housing shell. A first chamber is defined in the accumulator between the inner housing shell and the outer housing shell, the first chamber being configured to receive refrigerant from the inlet conduit and discharge the refrigerant to the compressor inlet. A second chamber is defined in the accumulator within the inner housing shell, the second chamber being configured to receive the refrigerant from the compressor outlet and discharge the refrigerant to the outlet conduit. Heat is transferred from the refrigerant in the second chamber through the inner shell to the refrigerant in the first chamber.

Provided is an evaporator including a header in which a depressed portion is formed by concavely depressing downwards a transverse central portion in a longitudinal direction from an upper surface, the portion in which the depressed portion is formed protrudes downwards to form a pair of partitions spaced apart from each other, and a communication hole is formed in a penetrating manner in a transverse direction in each of the pair of partitions; a tank in which a transverse central portion is coupled to a lower end of the partition of the header and both sides in the transverse direction are coupled to the header; and an insert plate inserted into the depressed portion of the header such that both surfaces are tightly attached to the pair of partitions, and having a through hole provided at a position corresponding to the communication holes provided in the pair of partitions.

Provided is an evaporator including a header in which a depressed portion is formed by concavely depressing downwards a transverse central portion in a longitudinal direction from an upper surface, the portion in which the depressed portion is formed protrudes downwards to form a pair of partitions spaced apart from each other, and a communication hole is formed in a penetrating manner in a transverse direction in each of the pair of partitions; a tank in which a transverse central portion is coupled to a lower end of the partition of the header and both sides in the transverse direction are coupled to the header; and an insert plate inserted into the depressed portion of the header such that both surfaces are tightly attached to the pair of partitions, and having a through hole provided at a position corresponding to the communication holes provided in the pair of partitions.

A system and method of freeze protection for a chiller including a metering device in flow communication with a condenser, a controller in electrical communication with the metering device, wherein the controller is configured to determine whether the difference between the fluid characteristic of the first liquid and the fluid characteristic of the second liquid is greater than a freezing limit, and enter a freeze protection mode if the difference between the fluid characteristic of the first liquid and the fluid characteristic of the second liquid is greater than the freezing limit.

The invention relates to a method of cleaning the condenser coil subassembly of an air conditioning apparatus and a bag apparatus for achieving that result. The invention envisions placing a flexible bag construction over and generally around such subassembly, but not over or around the subassembly containing the other components of the air conditioner. This bag has an adjustable mouth portion that will fit over the condenser coil subassembly and also has respective hole means to allow the entry of compressed air and exit of vacuum air, respectively, to and from the enclosed area surrounding the condenser coil subassembly. When the bag is appropriately in place over the subassembly to be cleaned, compressed air is supplied to the enclosed area to loosen and remove debris from the coils while vacuum air is also supplied to remove the debris from the enclosed area to thereby resulting in a cleaning of the condenser coil subassembly without contaminating the area outside the bag.