Abstract: To increase a heat exchange capacity of an indoor heat exchanger without increasing a pressure loss inside tubes of an outdoor heat exchanger. A heat exchanger is constituted by an indoor machine equipped with an indoor heat exchanger 10 constituted by a plurality of heat transfer tubes 12A, which have a spiral grooves 13A formed with a predetermined lead angle Ra on inner faces of the tubes and are made to pierce a plurality of fins 11, and an outdoor machine equipped with an outdoor heat exchanger 20 constituted by a plurality of heat transfer tubes 22A which have a lead angle Rb of spiral grooves 23A smaller than that of a heat transfer tubes 10A used for the indoor heat exchanger 10 and are made to pierce a plurality of fins 11.

Abstract: A heat pump system is provided. The heat pump system may include a compressor that compresses a refrigerant, a condenser that condenses the refrigerant, an expansion device that decompresses the refrigerant, and an evaporator that evaporates the refrigerant. The condenser may include a first heat exchanger of a first shell and tube heat exchanger and a second shell and tube heat exchanger. The evaporator may include a second heat exchanger of the first shell and tube heat exchanger and the second shell and tube heat exchanger. The first shell and tube heat exchanger or the second shell and tube heat exchanger may include a shell, in which the refrigerant may be introduced, a plurality of tubes disposed within the shell and into which a fluid heat-exchanged with the refrigerant may flow, two inlet/outlets disposed on a first side of the shell, and one inlet/outlet disposed on a second side of the shell.

Abstract: A method for controlling a vapor compression system during start-up is disclosed. The rate of change, ?T1, of the temperature of refrigerant entering the evaporator, and the rate of change, ?T2, of the temperature of refrigerant leaving the evaporator are compared. Based on the comparing step, a refrigerant filling state of the evaporator is determined. The opening degree of the expansion device is then controlled according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and according to a second control strategy in the case that it is determined that the evaporator is not full. Thereby it is ensured that a maximum filling degree of the evaporator is quickly reached, without risking that liquid refrigerant passes through the evaporator.

Abstract: A refrigeration apparatus uses R32 as a refrigerant, and includes a compressor, a condenser, an expansion mechanism, an evaporator and an accumulator. The accumulator is disposed in the suction flow path supplying refrigerant to the compressor. The accumulator has a casing that forms an inside space to separate the refrigerant into gas refrigerant and liquid refrigerant and accumulating surplus refrigerant, an inlet pipe feeding the refrigerant that has evaporated in the evaporator into the inside space, and an outlet pipe channeling the separated gas refrigerant to the compressor. A distal end opening in the inlet pipe of the accumulator is located in a height position separated by a dimension from a bottom of the inside space. The dimension is 0 to 0.3 times a height dimension of the inside space.

Abstract: A spiral chiller and a method of chilling a food product in a spiral chiller using a cooling medium wherein (a) the food product is conveyed within the chiller by a spiral conveyor having a plurality of spiral flutes and (b) the cooling medium is discharged either upwardly and/or downwardly within, and/or laterally into, one or more vertical gaps between adjacent pairs of spiral flutes using one or more delivery duct structures which extend inside the interior of the product chilling chamber.

Abstract: A rear plate of a refrigerator includes a base section formed at the outside of the rear plate while being flat, and a formed section formed to protrude from the base section toward the inner case through a foaming process. Outer equipment is installed at the formed section, to be disposed more inside than the base section and, as such, it is possible to protect the outer equipment from external impact. In addition, it is possible to achieve an improvement in rear appearance design of the refrigerator and an enhancement in space utility of the refrigerator.

Abstract: A module for warming and, alternately, for cooling, this module comprising an electrocaloric capacitor, an electrical energy storage device and a controllable circuit for transferring electrical energy between the electrocaloric capacitor and the energy storage device. The controllable circuit comprising an inductor connected between the electrocaloric capacitor and the storage device and at least one controllable switch. There is further included a unit programmed to control the switch so as to cause the transfer circuit to toggle successively into the following states and in the following order: an energy recovery state, a disabled state in which it electrically isolates the electrocaloric capacitor and the energy storage device, an energy release state and the disabled state, and each time to maintain the transfer circuit in the disabled state for a duration greater than a predetermined threshold.

Abstract: A transport refrigeration system includes a transport refrigeration unit having a refrigerant circuit through which a refrigerant is circulated in heat exchange relationship with air drawn from a cargo box, a fuel-fired engine for powering the refrigeration unit and having an exhaust system through which exhaust gases generated by the engine are discharged and an engine coolant circuit, an engine exhaust gases to engine coolant heat exchanger, and an engine coolant circuit to refrigeration unit heat exchanger.

Abstract: A solar-thermal refrigerant compression system employing refrigerants, such as R410a and R500, and a method of employing the system in refrigeration and air-conditioning units. The system includes a refrigerant storage tank, an evaporator, a mixing chamber, a condenser and an isochoric thermal compressor comprising a condensate heat exchanger and a heating coil connected to a solar collector field.

Abstract: An air conditioner may include a plurality of indoor units and a plurality of outdoor units connected to the plurality of indoor units. Each of the plurality of outdoor units may include a plurality of outdoor heat exchangers. Each of the outdoor heat exchangers may include a plurality of heat exchanger parts. When a defrosting operation condition is satisfied during a heating operation, indicating that a defrosting operation should be performed the plurality of heat exchanger parts of the plurality of outdoor heat exchangers may successively perform the defrosting operation.

Abstract: A body part of a decompression device has a swirl space for swirling a refrigerant that flows from a refrigerant inlet, and a refrigerant outlet that is positioned on an extension line of a swirl center line of the refrigerant and functions as a throttle. Further, a passage cross-sectional area of the refrigerant inlet is configured to be smaller than a twelve-fold value of a passage cross-sectional size of the refrigerant outlet, such that a swirl speed of the refrigerant in the swirl space is increased so as to enable a decompression boiling of the refrigerant around the swirl center line. In such manner, a gas-liquid mixture phase refrigerant securely flows into the refrigerant outlet, and it restricts a fluctuation of a flow amount of the refrigerant flowing toward a downstream side without complicating a cycle structure.

Abstract: A heat-recovery-type refrigerating apparatus includes a compressor, a heat-source-side heat exchanger, and a plurality of usage-side heat exchangers, and refrigerant is sent from the usage-side heat exchanger functioning as a refrigerant radiator to the usage-side heat exchanger functioning as a refrigerant evaporator, whereby heat can be recovered between the usage-side heat exchangers. Here, a portion of the heat-source-side heat exchanger is configured as a precooling heat exchanger for always circulating high-pressure vapor refrigerant discharged from the compressor, and a refrigerant cooler for cooling an electrical equipment item is connected to a downstream side of the precooling heat exchanger.

Abstract: The system heats glycol water using steam generated by a boiler and heating LNG using the glycol water, thereby increasing efficiently the LNG to temperature required for an engine. In addition, the system senses LNG flowing to a glycol tank using a pressure sensor, etc. when the LNG flows to the glycol tank due to pressure difference between a fuel supplying line and a glycol circulation line generated according as a heat exchanger is broken down, and outputs the flowed LNG to the outside. As a result, the glycol circulation line may be returned to original state and stability of the system may be enhanced.

Abstract: An installation for refrigerating a same application by means of a single refrigerator/liquefier or several refrigerators/liquefiers arranged in parallel, the refrigerator(s)/liquefier(s) using a working gas of the same type having a low molar mass, each refrigerator/liquefier comprising a compression station to compress the working gas, a cold box intended for cooling the working gas at the outlet of the compression station, the compression station comprising only compression machines of the lubricated screw type and systems for removing the oil from the working fluid at the outlet of the compression machines, and the compression station comprises a plurality of compression machines defining several levels of pressure for the working fluid, the compression station comprising at least two compression machines defining at least two levels of pressure increasing above the level of pressure of the fluid at the inlet of the compression station, two main compression machines being arranged in series and defining,

Abstract: A coil system for a magnetic resonance tomography system includes a plurality of coils for sending and/or receiving high-frequency signals. The plurality of coils is disposed in a receiving chamber between a tomography magnet and a lining of an opening in the tomography magnet and may be cooled by a cooling apparatus. When the coil system is in an operating state, the receiving chamber is filled with a cryogenic cooling medium.

Abstract: A cryogenic refrigerator includes a compressor which compresses a working gas, a housing which includes a space which the working gas compressed by the compressor flows into and flows from, a cylinder of which an end is connected to the housing and which includes an expansion space at the other end, and a displacer which permits flowing of the working gas into and from the expansion space via a working gas channel provided in an inner portion of the displacer while reciprocating in an inner portion of the cylinder. The working gas flows through a pipe which communicates with the space and the working gas channel.

Abstract: A method for retrofitting an aircraft air conditioning unit drainage system comprises the step of removing drain pipe from the unit housing. A hole from which the drain pipe extends is plugged. A first location within a unit housing is determined where during operation of the unit air pressure is lower than at a second location. A second location below the first location is also determined where pooling occurs. A first and a second conduit with first and second internal diameters are respectively located at the first and the second locations. The first conduit and the second conduit are connected to a third conduit which extends generally vertically and which has a third internal diameter that is generally equal to the first internal diameter. A fourth conduit with a fourth internal diameter that is less than the second internal diameter is connected to the third conduit below the second location.

Abstract: A refrigerant recovery system includes a first oil separator including a chamber configured to receive refrigerant from an air conditioning system, a heat exchanger disposed within the first oil separator, and a compressor fluidly connected to the chamber and the heat exchanger. A first valve is disposed in a first flow line that is fluidly connected between an inlet of the first oil separator and a source of refrigerant and a second valve is disposed in a second flow line that fluidly connects the compressor and the heat exchanger. A controller is configured to open the first valve to enable refrigerant to pass into the chamber of the first oil separator, open the second valve so that a flow loop for refrigerant is formed between the heat exchanger and the compressor, activate the compressor to heat the refrigerant flowing through the flow loop, and subsequently commence a refrigerant recovery operation.

Abstract: A heat exchanger includes an inner tube extending along a central axis, an array of a plurality of heat transfer members mounted to the inner tube, and a plurality of outer tubes disposed radially outward of and in parallel relationship to the inner tube, the inner and outer tubes extending longitudinally to pass through the array of heat transfer members. The heat exchanger is particularly suited for use as an engine exhaust cooler in connection with a transport refrigeration unit, wherein the inner tube defines an internal flow passage through which engine exhaust gas passes, each outer tube defines an internal flow passage through which refrigerant passes, and the plurality of flow passages between adjacent heat transfer members defines an air flow passage. In an embodiment, the heat transfer members may be annular disks having an internal chamber filled with air or other heat transfer working fluid.

Abstract: To increase a heat exchange capacity of an indoor heat exchanger without increasing a pressure loss inside tubes of an outdoor heat exchanger. A heat exchanger is constituted by an indoor machine equipped with an indoor heat exchanger 10 constituted by a plurality of heat transfer tubes 12A, which have a spiral grooves 13A formed with a predetermined lead angle Ra on inner faces of the tubes and are made to pierce a plurality of fins 11, and an outdoor machine equipped with an outdoor heat exchanger 20 constituted by a plurality of heat transfer tubes 22A which have a lead angle Rb of spiral grooves 23A smaller than that of a heat transfer tubes 10A used for the indoor heat exchanger 10 and are made to pierce a plurality of fins 11.