Abstract: The invention relates to a method for regeneration of a nitrogen oxide storage catalyst for a direct injected compression ignition engine. According to the invention, regeneration can be accomplished by adjusting air flow into the engine and controlling fuel injection to give a number of small part-injections during an expansion stroke of an engine cylinder.

Abstract: A process is proposed for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal combustion engine with a precatalyst and a particulate filter, in which process the afterinjection NE is performed as a function of the temperature in the area of the precatalyst Tcat and of the state of charging of the particulate filter. Since this process operates with especially high efficiency in heretofore critical short-distance operation of diesel internal combustion engines, the strict requirements of future legislation relating to exhaust gas emissions can immediately be met.

Abstract: The invention relates to a Method of purging a lean NOx trap (LNT) coupled downstream of a direct injection internal combustuion engine with post injection for achieving a purge air/fuel (A/F) ratio. At least two separate post injections are applied in the expansion stroke after a main injection train, so that a torque produced is decoupled from the A/F-control.

Abstract: A method for operating an exhaust-gas treatment device of an internal combustion engine and a device for carrying out the method, in which a reagent, whose pressure is measured by a reagent pressure sensor, is introduced into the exhaust-gas area upstream from the exhaust-gas treatment device. First the reagent pressure is brought to the exhaust-gas pressure which prevails in the exhaust-gas area upstream from the exhaust-gas treatment device. Then the pressure difference between the reagent pressure and the sum of the exhaust-gas pressure and the ambient air pressure is compared to a predefined pressure difference threshold, and if the pressure difference threshold is exceeded an error signal is supplied. The procedure contributes to an exact metering of the reagent through a diagnosis of the reagent pressure sensor.

Abstract: De-sulfurizing a NOx adsorber catalyst (48) without significantly increasing the temperature of exhaust gases leaving the engine exhaust manifold (42) by using a diesel oxidation catalyst (46) between the exhaust manifold and the NOx adsorber catalyst to elevate exhaust gas temperature entering the NOx adsorber catalyst to suitable de-sulfurizing temperature through control of certain aspects of engine operation (24, 28, 52).

Abstract: The invention regards a hydraulic cylinder (1) or a plug comprising a hydraulic cylinder for operation of anchoring and or sealing devises, where the hydraulic cylinder comprising a cylinder chamber (6), a piston head (4) within said cylinder chamber (6) forming two sub chambers (7, 7?) of said cylinder chamber (6) one on each side of the piston head (4), and a piston rod (5) which runs through the piston head (4) and said two sub chambers (7, 7?) or only one of said cub chambers. The hydraulic power unit (8) for operation of the hydraulic cylinder (1) is situated at least partly within the parts forming the hydraulic cylinder (1) itself, preferably the piston head (4) and or the piston rod (5).

Abstract: A power steering system includes a power cylinder, an accumulator, a reservoir, a pair of valves, and a pair of pressure transducers. The system selectively fluidly couples the accumulator and/or reservoir to the double-acting power cylinder and thereby causes the power steering system to function in the manner of a force-based power steering system.

Abstract: A distributed hydraulic system having a plurality of hydraulic functions each including a hydraulic actuator, a valve assembly that controls flow of fluid to the hydraulic actuator, and a function controller which operates the valve assembly. The function controllers exchange messages over a communication network which has a finite bandwidth. Access to the network is controlled by determining which function controllers govern high priority operations and allowing those function controllers to send messages as often as once every first interval of time. The other function controllers are limited to sending messages no more often than once every second interval of time, which is longer than the first interval of time.

Abstract: A system and method for controlling an internal combustion engine, having an exhaust recirculation (EGR) system and a charge air cooler, to prevent overheating the charge air cooler. The system calculates the output temperature of a turbocharger compressor as a function of ambient air temperature, air pressure, air mass flow rate, and turbo speed by processing an equation and controls the engine to modify charge air flow to reduce the output temperature of the turbocharger compressor if that temperature exceeds that of a determined crucial temperature above which charge air cooler damage could occur.

Abstract: A compound turbocharger is provided, including at least one housing. A first turbocharger having an outer shaft is disposed within the housing, and a second turbocharger is provided having an inner shaft co-axial with and extending within the outer shaft. At least one displacement limiter is disposed at a selected position along the length of the outer shaft. A method of reducing vibrational amplitude in an inner shaft of a coaxial shaft assembly is further provided, including the step of operably positioning at least one displacement limiter at a selected position along a length of the outer shaft.

Abstract: A Rankine cycle system is provided in which the amount of water supplied to an evaporator (12) and the rotational speed of an expander (13) are controlled so as to make the temperature of steam at the outlet of the evaporator (12) coincide with a target steam temperature. When the amount of water supplied to the evaporator (12) is decreased stepwise, the temperature of the steam at the outlet of the evaporator (12) increases slowly and converges to a predetermined temperature. When the rotational speed of the expander (13) is decreased stepwise the steam temperature increases quickly, although the increase is temporary.

Abstract: An air-cooled condenser has a first stage comprising both a K and a D section with fin tubes fed with steam at both ends, and a second stage comprising a D section. Each core tube in the first stage has at least one extraction channel at the trailing edge of the core tube located in an unfinned section of the core tube and separated from the main section of the core tube by a rib or baffle. Extraction channels may be provided at both the leading and trailing edges or rounded ends of the core tube, or at the trailing edge only. Openings in the rib connect at least a central portion of the main section to the extraction channel. The upper end of each extraction channel of each core tube is connected via an extraction passageway and transfer duct to the lower ends of the D-section fin tubes. The D-section creates a strong suction action to draw steam and non-condensibles out of the first stage.

Abstract: A variable-section nozzle for a turbomachine, the nozzle comprising a plurality of moving flaps mounted on the downstream end of an annular casing of the turbomachine, a moving flap control system comprising control levers each associated with a respective moving flap and at least one actuator for actuating the control levers, and a plurality of pairs of arms each forming a control lever support, the arms of each support being secured both to the casing and to a control lever, each pair of arms forming a control lever support being formed as a single piece.

Abstract: A method of operating a gas turbine engine is provided. The method includes introducing a fuel into a combustor, detecting a failure of ignition of the fuel, and preventing ignition until the introduced fuel is substantially removed from the gas turbine engine.

Abstract: A method for regenerating a motor vehicle particle filter that uses a mechanism for regenerating the filter when a load value exceeds a predetermined threshold. Further, a parameter representing operating conditions of the regenerating mechanism is calculated, and the operating conditions of the regenerating mechanism are controlled on the basis of the parameter.

Abstract: Techniques described and illustrated herein can permit high luminous flux and/or longer lifetimes for a class of photoemissive device configurations and/or uses that generate intense highly localized, but transient heat flux. For example, certain Light Emitting Diode (LED) applications, e.g., for flash illumination, certain solid state laser configurations and other similar configurations and uses may benefit from the developed techniques. In particular, it has been discovered that by locating an amount of appropriate phase change material in close thermal proximity to such a photoemissive device, substantial generated heat fluxes may be “absorbed” into a phase transition of the phase change material. In some configurations, a thermoelectric is employed in conjunction with the phase change material. For example, the thermoelectric may at least partially define a heat transfer path from the photoemissive device to the phase change material. Similar configurations may be employed for photosensitive devices.

Abstract: A single-use, self-heating or self-cooling container, particularly for beverages, producible in a plurality of sizes, comprises a first receptacle (2) containing a beverage and inserted into a second receptacle (3), a first compartment (11) formed between the first and the second receptacle and a second compartment (12) formed on the base of the second receptacle and separated from the first compartment by a breakable diaphragm (13). In these compartments (11, 12) are separately and respectively arranged at least a first and a second component of an exothermic or endothermic reaction, and the first component is arranged in the first compartment (11) annularly around the first receptacle (2), while the diaphragm (13) extends as a separation of these compartments substantially against the base (4) of the first receptacle.

Abstract: A regenerative refrigeration system includes one or more control devices that utilize micro electro mechanical systems (MEMS) technology. Such MEMS devices may be small in size, on a scale such that it can be introduced into a refrigeration system, such as a cryocooler, without appreciably affecting the size or mass of the refrigeration system. Through the use of MEMS devices, dynamic control of the system may be achieved without need for disassembly of the system or making the system bulky. Suitable regenerative refrigeration systems for use with the MEMS devices include pulse tube coolers, Stirling coolers, and Gifford-McMahon coolers.

Abstract: Apparatus and methods for improving the safety and efficiency and decreasing the cost of producing liquid gas, such as liquid oxygen, with a small-scale use liquefaction device, according to various embodiments of the present invention. In one embodiment, liquid oxygen barrier may be added to interface between a cryocooler and a dewar to control rate of liquid oxygen escape upon a tipping of the dewar. A boiloff vessel in fluid communication with the dewar allows expanding gas from a tipped dewar to escape while allowing the liquid to safely settle in the boiloff vessel. A temperature sensing circuit, in proximity with a heat dissipator or cold finger of the cryocooler, is operable to break an electrical power circuit of the cryocooler or cooling fan when a sensed temperature exceeds a predetermined temperature. Oxygen purity of a feed stream of gas may be sensed and/or displayed.

Abstract: Gaseous fluid production apparatus according to one embodiment of the invention includes a fluid container containing fluid in substantially the liquid state. A first fluid line is connected to the fluid container so that it receives from the fluid container a first fluid stream substantially in the liquid state. A gas generator is also connected to the fluid container so that it receives from the fluid container a second fluid stream substantially in the liquid state. A product discharge manifold is connected to the gas generator and to the first fluid line. A control means is operatively associated with the first fluid line and the product discharge manifold for controlling at least one parameter of the first fluid stream. A second control means is operatively associated with the gas generator and the product discharge manifold for controlling at least one parameter of the second fluid stream.

Abstract: A cryogenic system includes a containment vessel in which a body to be cooled is housed in such a manner that the body is immersed in a liquid coolant; a tubular refrigerator sleeve; and a refrigerator, inserted in the opening section of the refrigerator sleeve, for recondensing coolant gas generated from the coolant, wherein a gas flow-forming means for forming a flow of purge gas toward an opening section of the refrigerator sleeve is provided. The purge gas prevents air from entering a refrigerator sleeve during the replacement of a refrigerator of a cryogenic system.

Abstract: Apparatus and methods for improving the safety and efficiency and decreasing the cost of producing liquid oxygen with a small-scale use liquefaction device, according to various embodiments of the present invention. In one embodiment, a switch is electrically coupled to a storage dewar pressurizing means, the switch positioned to be activated by a portable dewar upon engagement of portable dewar with storage dewar. Cryocooler and/or cooling fan enter low power mode when dewar liquid level reaches a predetermined level, and to return to a fall power mode when dewar liquid level drops to another predetermined level. A cold finger of the cryocooler extends within the dewar and may prevent overfilling of the dewar. The cold finger has a temperature gradient. As the gas liquefies and fills the dewar, the liquid level rises only to a level on the cold finger at which the temperature exceeds the boiling point of oxygen.

Abstract: Disclosed are an abnormal state detecting apparatus of a multi-type air conditioner and a method thereof. The method comprises: a user's selecting a test operation, and then detecting plural indoor temperatures of indoor zones where a plurality of indoor units are installed and plural outdoor temperatures of outdoor zones where a plurality of outdoor units are installed; selecting a corresponding test operation mode among a plurality of test operation modes preset according to an average indoor temperature of the detected plural indoor temperatures and an average outdoor temperature of the detected plural outdoor temperatures; test-operating the multi-type air conditioner according to the selected test operation mode, and collecting data showing an operation state of the test-operated air conditioner; and comparing the collected data with a preset reference data and judging an abnormal state of the air conditioner based on the comparison result.

Abstract: A system for detecting a mis-connected state between communication lines for a multi-type air conditioner and a method thereof. The system comprises an indoor unit pipe temperature detection unit for detecting a temperature of an indoor unit pipe, and a microprocessor for controlling an opening of an electronic expansion valve based on a temperature detected by the indoor unit pipe temperature detection unit, comparing a temperature response characteristic of the indoor unit pipe with a preset temperature response characteristic of a normal indoor unit pipe based on an opening of the electronic expansion valve, and thereby judging whether the communication lines are mis-connected to one another or not. An indoor unit from which the mis-connection has been generated is fast detected, and error information is displayed. Accordingly, the mis-connected state between the communication lines is restored, thereby preventing a damage of the system due to the mis-connection.

Abstract: A method for detecting a clogged state of a pipe of a heat pump type multi-air conditioner includes: detecting a temperature of a pipe of an arbitrary indoor heat exchanger among a plurality of indoor heat exchangers; detecting a pressure of a refrigerant sucked into an arbitrary outdoor unit among a plurality of outdoor units in case of performing an air-conditioning operation, and detecting a pressure of a refrigerant introduced into the arbitrary indoor heat exchanger after being discharged from an arbitrary outdoor unit among the plurality of outdoor units in case of performing a heating operation; and comparing a pressure corresponding to the detected temperature of the pipe and the detected pressure of the refrigerant and determining whether the pipe is clogged based on the comparison result. By detecting a clogged state of a pipe, the heat pump type multi-air conditioner is prevented from being damaged due to a clogged state of the pipe.

Abstract: An electric refrigerator comprising a cooling space in which a temperature sensor is arranged and which is closable by a heat-insulating door. The temperature sensor is connected to a device which regulates the cooling temperature and is adjustable by a temperature-setting device. The temperature sensor and the regulating device are disposed separately from the temperature-setting device inside or preferably outside the cooling space.

Abstract: A method of making ice cubes in a compact ice maker by setting a freeze time based on the determined volume of a mold for the ice maker.

Abstract: A vapor compression system including a closed fluid circuit having operably coupled thereto, in serial order, a compressor, a first heat exchanger, an expansion device, a second heat exchanger and a fluid vessel. The refrigerant is compressed in the compressor and circulated through the fluid circuit. Thermal energy is removed from the refrigerant in the first heat exchanger. The pressure of the refrigerant is reduced in the expansion device, and thermal energy is added to the refrigerant in the second heat exchanger. Upon ceasing operation of the system, refrigerant present in the vessel defines a lower temperature than the refrigerant present in the second heat exchanger. A thermal energy storage medium is operably coupled to the vessel and provides the vessel with thermal inertia wherein the temperature of the refrigerant in the vessel remains cooler than the temperature of the refrigerant in the second heat exchanger.

Abstract: There are provided a moisture conditioning method and a moisture conditioning apparatus which enable the moisturizing of a coating film in a short time and at high efficiency, thereby improving productivity, and besides, do not require an increase in the path length of the moisture conditioning zone, thereby contributing to cost saving and space saving. When moisture conditioning a coating film having been applied onto a substrate by allowing the coating film to stand in or pass through a moisture conditioning zone where humidity is controlled by spraying water, the water to be sprayed in the moisture conditioning zone is made into fine water particles before being sprayed by applying a high voltage or a magnetic force to the water using a moisture conditioning apparatus.

Abstract: A transcritical vapor compression system includes a fluid circuit circulating a refrigerant in a closed loop. The fluid circuit has operably disposed therein, in serial order, a first compressor, an intercooler, a second compressor with a variable capacity, a first heat exchanger, an expansion device and a second heat exchanger. The first compressor compresses the refrigerant from a low pressure to an intermediate pressure. The second compressor compresses the refrigerant from the intermediate pressure to a supercritical pressure. The first heat exchanger is positioned in a high pressure side of the fluid circuit. The second heat exchanger is positioned in a low pressure side of the fluid circuit. The expansion device reduces the pressure of the refrigerant from a supercritical pressure to a relatively lower pressure. Cooling means cools the refrigerant within one of the compressors.

Abstract: The temperature of the air exiting an evaporator and the relative humidity of the air entering and exiting the evaporator can be calculated by using existing sensors in a vapor compression system. The temperature of the air exiting the evaporator is calculated by using the detected temperature of the air entering the evaporator, the saturation temperature of the air, and a bypass factor. The relative humidity of the air entering and exiting the evaporator are then estimated using a psychrometric chart. By using the existing sensors to determine the temperature of the air exiting the evaporator and the relative humidity of the air entering and exiting the evaporator, the load requirement of the vapor compression system can be calculated without employing additional sensors. The system capacity of the vapor compression system can be matched to the load requirement to allow the effective use of electric power.

Abstract: A dehumidifier system is connected to an interior space of a building through supply and return ducts, either directly and/or through an HVAC system. Controllable dampers can be used to select how the dehumidifier system is connected to the interior space and the HVAC system. The dehumidifier determines the dew point of the ambient air from temperature and relative humidity measurements taken at location(s) of relative humidity and temperature sensors. Based on the determined dew point, the dehumidifier system determines whether to operate. The temperature and relative humidity sensors can be located in the interior space or within the dehumidifier, where they project into the air stream flowing through the dehumidifier. The dehumidifier system operates in response in part to blower calls to the HVAC system and controls the HVAC system and a ventilation system to distribute the dehumidified air and outside air throughout the building.

Abstract: A method and system for controlling a cooling fan that cooperates with an air conditioning condenser in a vehicle. The present embodiments include steps and corresponding implementations for determining a speed of the vehicle, determining a discharge pressure of the air conditioning condenser, determining an ambient temperature of air surrounding the vehicle and determining an outlet temperature of a vehicle air conditioning system. The cooling fan is operated in one or more desired fan speed modes corresponding to one or more respective discharge pressure ranges. The fan speed modes are a function of vehicle speed and one or more of ambient temperature, outlet temperature, and discharge pressure.

Abstract: A constant-temperature fluid supply system is provided with a first constant-temperature fluid supply apparatus and a second constant-temperature fluid supply apparatus. The first constant-temperature fluid supply apparatus has an input side to which a cooling fluid not controlled in temperature is supplied, and an output side from which a first constant-temperature fluid having a stable temperature is supplied. The second constant-temperature fluid supply apparatus has an input side to which the first constant-temperature fluid is supplied, and an output side from which a second constant-temperature fluid having a more stable temperature than that of the first constant-temperature fluid is supplied.

Abstract: A system and humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits that balances humidity control and cooling demand. Each refrigerant circuit includes a compressor, a condenser and an evaporator. A hot gas reheat circuit having a hot gas reheat coil is connected to one of the refrigerant circuits and is placed in fluid communication with the output airflow from the evaporator of that refrigerant circuit to provide additional dehumidification to the air when humidity control is requested. The hot gas reheat circuit bypasses the condenser of the refrigerant circuit during humidity control. Humidity control is performed during cooling operations and ventilation operations. During a first stage cooling operation using only one refrigerant circuit and having a low cooling demand, the request for humidity control activates the hot gas reheat circuit for dehumidification and activates a second refrigerant circuit to provide cooling capacity.

Abstract: The invention relates to an expansion valve and a method for controlling an expansion valve, in which the opening and closing movement of the valve-closing element is adjusted as a function of the pressure difference which is present on the high-pressure side in an inlet opening and on the low-pressure side in an outlet opening.

Abstract: A vehicle air conditioner is controlled to a target control value that controls a swash-plate control value of a swash-plate variable capacity compressor. The variable control is based on temperature deviation between target evaporator temperature and actual evaporator temperature, to control compressor discharge capacity. A target evaporator temperature is set. Deviation between the target evaporator temperature and actual evaporator temperature is calculated. Control coefficients are variably set according to the magnitude of the temperature deviation. A target control value of a pressure control valve of the swash-plate variable capacity compressor is calculated using the control coefficients. The pressure control valve is controlled by the target control value.

Abstract: A structure, system and method for controlling a temperature of a heat generating device in a solid medium, wherein heat is extracted from the medium into at least one heat extraction device, the heat extraction device dissipates heat into an environment apart from the medium by a heat sink thermally coupled to the heat extraction device; and heat from the medium is dissipated into the heat sink by a first thermal interface material thermally coupling the heat sink to the medium.

Abstract: In an embodiment of a vent for a data center cooling system the vent has a body that has a fluid outlet. The body of the vent also has a member that can be adjusted to obstruct the fluid outlet. Mounted to the body of the vent is an electromechanical assembly for effecting an adjustment of the member. The body also has a battery for powering the electromechanical assembly.

Abstract: A dehumidifying system, comprising: a dehumidifier having a dehumidifying zone which is provided at a flow passage of supply air supplied to a low dew-point chamber and dehumidifies the supply air with a dehumidifying member and a regenerating zone which allows regenerating air to pass through the dehumidifying member to regenerate the dehumidifying member, and a condenser of a heat pump provided at a flow passage of the regenerating air, and heating the regenerating air.

Abstract: A non-stick coating, which inhibits frozen moisture accumulation, is applied to the exterior exposed portions of a refrigerant/air heat exchanger, which heat exchanger is comprised of a capillary tube/plate means/design, which plate has an exterior surface that is comprised of at least one of raised dots, ridges, trenches, and a flat surface, which means/design facilitates the shedding of frozen moisture and maximizes heat exchanger surface area exposure to the air; for use in conjunction with an air source heat pump system, an evaporative cooling system or a chiller, or as a supplement to a water-source heat pump system or to a direct expansion heat pump system; and for use with any other refrigerant-based heating system or cooling system.

Abstract: A combination pressure measurement/refrigerant charging apparatus may include a shutoff valve that includes a piercing pin and a pressure gauge. The piercing pin may be used to pierce a refrigerant can. The pressure gauge may be used as a handle for operating the shutoff valve. A first end of a hose may be coupled to the shutoff. A quick coupling device may be coupled to a second end of the hose. The quick coupling device may be used to couple the apparatus to a refrigerant system.

Abstract: A combination pressure measurement/charging system may include a conduit coupled to a refrigerant can. The conduit may be coupled to a low-pressure side of a refrigerant system. The system may include a valve to control a flow of fluid through the conduit. Thus, a flow of fluid between the refrigerant can and the low-pressure side of the refrigerant system may be controlled using the valve. A first pressure gauge may be in fluid communication with the conduit. The first pressure gauge may be coupled to the low-pressure side of the refrigerant system. The first pressure gauge may be used to operate the valve to control fluid flow through the conduit. A second pressure gauge may be coupled to a high-pressure side of the refrigerant system. The second pressure gauge may be isolated from fluids that flow through the conduit.

Abstract: A portable refrigeration unit for cooling a refrigerated space, the unit comprising an evaporator unit that is separable from a condensing unit, the evaporator unit and condenser unit being connected by extended lengths of flexible hosing, such that the evaporator unit can be positioned within the space and the condenser unit positioned external to the space during cooling operations.

Abstract: In a dehumidification unit comprising alternate laminations of an adsorption element (1) which supports an adsorbent and which is provided with a first air ventilation passage (3) and a cooling element (2) which is provided with a second air ventilation passage (4), the first air ventilation passage (3) of the adsorption element (1) and the second air ventilation passage (4) of the cooling element (2) are adjacently formed, with a single plate member (P) lying between the first and second air ventilation passages (3, 4). As a result of such arrangement, as compared with a structure in which the air ventilation passages (3, 4) are adjacently formed with two plate members lying therebetween, the performance of heat transfer between the air ventilation passages (3, 4) is further improved, and the action of absorbing and removing heat of adsorption is promoted, whereby the dehumidification capability of the dehumidification unit is maintained at high levels over a long period of time.

Abstract: A refrigerator provides for flexibility in the allocation of refrigerator space. The refrigerator includes multiple compartments. Each of the compartments can be convertible or resizable between a freezer compartment and a refrigeration compartment. Preferably, each compartment is independently temperature controlled. To resize the compartments, positionable separators can be used.

Abstract: An dispensing system suitable for lifting and dispensing ice through the refrigerator compartment door of a bottom-mount refrigerator or lifting and dispensing ice from an undercounter ice maker to a dispenser on the countertop.

Abstract: An ice making and dispensing system suitable for making and dispensing ice through the refrigerator compartment door of a bottom freezer refrigerator. The ice maker and ice cube storage bin are located in an insulated sub-compartment in the refrigerator compartment. The insulated sub-compartment is maintained below 0° C. for forming and storing ice cubes. The insulated sub-compartment can be positioned adjacent the freezer compartment and can be cooled by below 0° C. air from the freezer compartment or from an auxiliary evaporator.

Abstract: An ice making and dispensing system suitable for making and dispensing ice through the refrigerator compartment door of a bottom freezer refrigerator. The ice maker and ice cube storage bin can be positioned in an insulated module in the refrigerator compartment opposite an ice dispenser positioned on the refrigerator compartment door. The insulated module is maintained at temperatures below 0° C. for forming and storing ice cubes. Air ducts from the evaporator compartment or an auxiliary ice maker evaporator can be provided to maintain below 0° C. temperatures in the insulated module.

Abstract: An ice and water dispenser for a bottom freezer refrigerator positioned on a refrigerator compartment door. The ice maker and ice cube storage bin can have below 0° C. air provided to maintain the ice maker and ice cube storage bin below 0° C. Supply and return ducts can convey below 0° C. air to the ice maker and ice cube storage bin. The supply and return ducts can lead from the bottom freezer compartment or from an evaporator compartment. The ice maker and ice cube storage bin can be located in insulated sub-compartment to allow normal refrigerator compartment temperatures to be maintained in the above freezing refrigerator compartment.