Abstract: A refrigeration defrost system including at least one frosted evaporator having an evaporator refrigerant vapor line and an evaporator refrigerant liquid line, comprises a first compressor having a suction inlet line and a discharge outlet line each connected to a discharge manifold, the discharge outlet being connected to said evaporator refrigerant vapor line. A first pressure regulator valve disposed in a refrigerant bypass passageway between the discharge manifold and the suction inlet line, feeds refrigerant vapor, when a defrost cycle is required, from the discharge manifold into the suction inlet line. The refrigerant vapor is fed from the first compressor into the discharge outlet line and into the frosted evaporator through the evaporator refrigerant vapor line, thereby defrosting said frosted evaporator. Also disclosed is a method of defrosting a frosted evaporator using a single, dedicated defrost compressor.

Abstract: A refrigeration defrost system includes a frosted evaporator with an evaporator refrigerant vapor line and an evaporator refrigerant liquid line. A compressor with a suction inlet and a discharge outlet are both connected to a discharge manifold. The discharge outlet is connected to the evaporator refrigerant vapor line. A pressure regulator valve is located in a refrigerant bypass passageway between the discharge manifold and the suction inlet line and feeds refrigerant vapor, when a defrost cycle is required, from the discharge manifold into the suction inlet. A check valve is connected in series with the regulator valve to stop low pressure refrigerant vapor from the evaporator refrigerant vapor line from feeding into the suction inlet. The refrigerant vapor is fed from the compressor into the discharge outlet and into the evaporator through the evaporator refrigerant vapor line, which defrosts the evaporator.

Abstract: A defrost refrigeration system having a main refrigeration system and comprising a first line extending from a compressing stage to an evaporator stage and adapted to receive refrigerant in high-pressure gas state from the compressing stage. A first pressure reducing device on the first line is provided for reducing a pressure of the refrigerant in the high-pressure gas state to a second low-pressure gas state. Valves are provided for stopping a flow of the refrigerant in a first low-pressure liquid state from a condensing stage to evaporators of the evaporator stage and directing a flow of the refrigerant in the second low-pressure gas state to release heat to defrost the evaporators and thereby changing phase at least partially to a second low-pressure liquid state. A second line is provided for directing the refrigerant having released heat to the compressing stage, the condensing stage or the evaporator stage.

Abstract: There is provided a rotary compressor capable of preventing deterioration of performance following plug fixing carried out to prevent falling-off of a spring member. The rotary compressor comprises a cylinder constituting a rotary compression element, a roller engaged with an eccentric portion formed in a rotary shaft of an electric element, and eccentrically rotated in the cylinder, a vane abutted on the roller to divide an inside of the cylinder into a low pressure chamber side and a high pressure chamber side, a spring member for always pressing the vane to the roller side, a housing portion of the spring member, formed in the cylinder, and opened to the vane side and a hermetically sealed container side, a plug positioned in the hermetically sealed container side of the spring member, and inserted into the housing portion to fit into a gap, and an O ring attached around the plug to seal a part between the plug and the housing portion.

Abstract: An air conditioning system for conditioning ambient air of an environment, an interior heat exchanger coil used in such air conditioning system, and a method for conditioning ambient air of the environment. The air conditioning system has first and second reverse cycle refrigeration apparatuses each including a circuit having an interior portion located inside of the environment and being provided with a heat exchanger coil, and an exterior portion located outside of the environment. The heat exchanger coil of the second reverse cycle refrigeration apparatus is distinct from the heat exchanger coil of the first reverse cycle refrigeration apparatus and extends substantially along at least a portion of a given path along which the latter extends. The system also has a group of fins extending between both heat exchanger coils along the portion of the given path for allowing a heat exchange between both heat exchanger coils.

Abstract: The invention relates to a heating/cooling circuit for a motor vehicle comprising an evaporator (14) for cooling air to be fed into an interior space, a heat exchanger (16) for heating said air to be fed into the interior space, an external heat exchanger (22) comprising a compressor for transporting coolant, a first expansion organ (28), allocated to the evaporator (14), a second expansion organ (30), allocated to the external heat exchanger (22) and coolant conduits (L1 to L12), via which the aforementioned components are interconnected. The compressor (24), the external heat exchanger (22) and the second expansion organ (30) constitute a de-icing circuit of the inventive circuit.

Abstract: Method for defrosting of a heat exchanger (evaporator) in a vapor compression system including, beyond a heat exchanger (evaporator) (3) to be defrosted, at least a compressor (1), a second heat exchanger (condenser/heat rejecter) (2) and an expansion device (6) connected by conduits in an operable manner to form an integral closed circuit. The heat exchanger (3) to be defrosted is subjected to essentially the same pressure as the compressor's (1) discharge pressure whereby the heat exchanger (3) is defrosted as the high-pressure discharge gas from the compressor (1) flows through to the heat exchanger, giving off heat to the said heat exchanger (3).

Abstract: A defroster restrains a vane jump that takes place when an evaporator is defrosted in a refrigerant circuit using a so-called internal intermediate-pressure type double-stage compression rotary compressor. The defroster includes a rotary compressor that discharges a refrigerant gas that has been compressed by a first rotary compressing unit into a hermetic vessel and further compresses the discharged intermediate-pressure refrigerant gas, a gas cooler, an expansion valve, and an evaporator. To defrost the evaporator, the refrigerant gas discharged from the second rotary compressing unit is introduced into the evaporator without decompressing it by the expansion valve. Furthermore, the refrigerant gas discharged from the first rotary compressing unit is introduced into the evaporator. At the same time, an electromotive unit of the rotary compressor is run at a predetermined number of revolutions.

Abstract: In a vehicle air conditioner with a heat pump cycle having an interior heat exchanger and an exterior heat exchanger, when a frosting on a surface of the exterior heat exchanger is determined and when a temperature of hot water supplied to a heater core is equal to or higher than a predetermined temperature, the exterior heat exchanger is defrosted in a defrosting operation. Accordingly, the defrosting operation can be performed while a sufficient heating can be obtained.

Abstract: An ice cube-making machine that is characterized by noiseless operation at the location where ice cubes are dispensed and be lightweight packages for ease of installation. The ice cube-making machine has an evaporator package, a separate compressor package and a separate condenser package. Each of these packages has a weight that can generally by handled by one or two installers for ease of installation. The noisy compressor and condenser packages can be located remotely of the evaporator package. The maximum height distance between the evaporator package and the condenser package is greatly enhanced by the three package system. A pressure regulator operates during a harvest cycle to limit flow of refrigerant leaving the evaporator, thereby increasing pressure and temperature of the refrigerant in the evaporator and assisting in defrost thereof.

Abstract: A transportation refrigeration system operable in a cooling mode, a defrost mode, and a heating mode to condition air in an air-conditioned space. The system comprises a refrigeration circuit fluidly connecting a compressor, a condenser, a tank, and an evaporator. The evaporator is in thermal communication with the air-conditioned space. A heating circuit fluidly connects the compressor, the tank, the evaporator, and a heater. A defrost circuit fluidly connects the compressor, the tank, the evaporator, and the heater. The tank has a base and the first opening is spaced a first distance above the base and the third opening is spaced a second greater distance above the base.

Abstract: The present invention relates to a device and method for operating a refrigeration cycle without icing of the evaporative surface of the device.

Abstract: Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging temperatures. The defrost cycle operates continuously, when required, and provides a shorter recovery period between heating/defrost and cooling operating modes. The rate of the temperature change during cool down or warm up is controlled in an open loop fashion by controlled refrigerant flow in bypass circuits.

Abstract: A method and system for executing a hot gas heating cycle in a mobile refrigeration unit includes diverting a flow of hot gas by bypassing a condenser into a receiver and restricting the flow, thereby raising a discharge pressure and temperature of the unit. The discharge pressure of the unit is monitored, and the restriction is regulated when the discharge pressure reaches a predetermined pressure. A combination of small and large orifice hot gas valves is used, or optionally a hot gas stepper valve. A solenoid valve or an evaporator expansion valve is optionally used to meter refrigerant into the heat loop.

Abstract: In a refrigerator using a flammable coolant, in order to decrease danger of ignition when defrosting is conducted under an environment of leakage of the flammable coolant, the refrigerator comprises a cooling cycle evaporator and a defrosting devicve for defrosting the evaporator, wherein a temperature of the defrosting device is lower than an ignition temperature of the flammable coolant.

Abstract: A refrigeration system for cooling a logic module includes an evaporator housing including an evaporator block in thermal communication with the logic module. The evaporator housing includes a humidity sensor for detecting a humidity within the evaporator housing. The system further comprises a controller for controlling a refrigeration unit supplying cold refrigerant to the evaporator block in response to the operating conditions of the logic module and the temperature of the evaporator block. In another aspect of the invention, two modular refrigeration units are independently operable to cool the evaporator block, and each refrigeration unit is controllable in various modes of operation including an enabled mode in which it is ready to cool the evaporator and an on mode in which it is actively cooling the evaporator. In another aspect of the invention, the evaporator block and a heater on a reverse side of the circuit board are particularly controlled during concurrent repair operations.

Abstract: In a heat pump apparatus having a refrigerating cycle including a compressor 1, a gas cooler 3, a pressure reducing device 5 and an evaporator 7 in which water can be heated by the gas cooler, the compressor 1 comprises a two-stage compression type compressor for leading all or a part of refrigerant compressed to an intermediate pressure at a first stage through a shell case 11 to a second stage, compressing the intermediate-pressure refrigerant to a high pressure at a second stage and discharging the high-pressure refrigerant, and there is equipped a defrosting circuit 33 for leading the intermediate-pressure refrigerant of the first stage of the compressor 1 to the evaporator 7 with bypassing the gas cooler 3 and the pressure reducing device 5.

Abstract: An apparatus for removing deposits from a heat transfer wall of a heat exchanger. The apparatus includes a cleaning cycle control system that operates through the control system of the heat pump and eliminates the need for periodic acid cleaning of heat exchanger. The cleaning cycle control system engages a heating cycle of the heat pump to at least partially freeze the fluid adjacent to the heat transfer wall and then engages the cooling cycle of the heat pump to thaw the fluid adjacent to the heat transfer wall. The thermal expansion and contraction of the deposits on the heat transfer wall and the flow of fluids through the heat exchanger flush deposits from the heat transfer wall of the heat exchanger.

Abstract: A refrigerator has a fresh food compartment (3) adapted for maintaining the contents at a temperature above freezing. A vapour compression refrigeration system is operable in one mode so that an evaporator (7) is operated at a temperature within 10° C. of the temperature desired in the fresh food compartment (3) and a supply of air is maintained over the evaporator (7) and in to the compartment (3). The vapour compression system is used in a defrost mode in which the vapour compression refrigeration system is stopped or allowed to operate without significant heat extraction at the evaporator (7), and a supply of air above 0° C. is past over it. Operating the fresh food compartment evaporator (7) at such a high temperature (close to 0° C.) reduces the rate of frost build up and the under cooling of frost. Frost may be adequately removed by an ambient air flow without heater supplementation.

Abstract: A refrigeration system for objects is disclosed. The system includes a refrigeration device and a defrost system. The refrigeration device provides a case or container defining a space for the objects, a first heat exchanger associated with the container for cooling a fluid communicating with the space to cool the objects and a second heat exchanger to receive a heat supply from an air source for warming the fluid. A system for cooling articles is also disclosed. The system includes a space configured to contain the articles, a first element to provide cooling of the articles within the space, a first coolant source to refrigerate the space by cooling the first element in a first state, and a second coolant source to elevate a temperature of the first element in a second state.

Abstract: A method and system for executing a hot gas heating cycle in a mobile refrigeration unit includes diverting a flow of hot gas by bypassing a condenser into a receiver and restricting the flow, thereby raising a discharge pressure and temperature of the unit. The discharge pressure of the unit is monitored, and the restriction is regulated when the discharge pressure reaches a predetermined pressure. A combination of small and large orifice hot gas valves is used, or optionally a hot gas stepper valve. A solenoid valve or an evaporator expansion valve is optionally used to meter refrigerant into the heat loop.

Abstract: An ice cube-making machine that is characterized by noiseless operation at the location where ice cubes are dispensed and be lightweight packages for ease of installation. The ice cube-making machine has an evaporator package, a separate compressor package and a separate condenser package. Each of these packages has a weight that can generally by handled by one or two installers for ease of installation. The noisy compressor and condenser packages can be located remotely of the evaporator package. The maximum height distance between the evaporator package and the condenser package is greatly enhanced by the three package system. A pressure regulator operates during a harvest cycle to limit flow of refrigerant leaving the evaporator, thereby increasing pressure and temperature of the refrigerant in the evaporator and assisting in defrost thereof.

Abstract: A method of defrosting a refrigeration system having a main compressor connected by a main hot gas discharge line to a condenser, the condenser being connected by a main liquid line to thermal expansion valves and subsequent cooling coils, each thermal expansion valve and cooling coil being in parallel connection with the other thermal expansion valves and cooling coils, and each cooling coil being connected by a suction line to the main compressor, the defrosting method includes passing hot gas from the main hot gas discharge line through a selected cooling coil to defrost same, compressing cooled hot gas which has passed through the cooling coil by means of a separate dedicated defrost compressor, and returning the compressed hot gas to the main hot gas discharge line.

Abstract: In an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced into an evaporator through a bypass passage while bypassing an ejector and a gas-liquid separator in a defrosting operation for defrosting frost generated on the evaporator. In addition, a throttle or a check valve is provided in a refrigerant passage from the gas-liquid separator to a refrigerant inlet side of the evaporator. Accordingly, in the defrosting operation, the hot gas refrigerant from the compressor can be accurately introduced into the evaporator through the bypass passage without flowing toward the gas-liquid separator.

Abstract: An object of the present invention is to provide a method for manufacturing a multi-stage compression type rotary compressor which can avoid the replacement of parts to be used as much as possible to reduce costs and also which enables easily setting an appropriate displacement volume ratio while preventing-the compressor from being increased in size. The gist of the present invention is that an inner diameter of a lower cylinder is altered without altering its thickness (or height), and a displacement volume ratio between first and second rotary compression elements is set to an optimum value in accordance with the alteration.

Abstract: Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging temperatures. The defrost cycle operates continuously, when required, and provides a shorter recovery period between heating/defrost and cooling operating modes. The rate of the temperature change during cool down or warm up is controlled in an open loop fashion by controlled refrigerant flow in bypass circuits.

Abstract: A transportation refrigeration system operable in a cooling mode, a defrost mode, and a heating mode to condition air in an air-conditioned space. The system comprises a refrigeration circuit fluidly connecting a compressor, a condenser, a tank, and an evaporator. The evaporator is in thermal communication with the air-conditioned space. A heating circuit fluidly connects the compressor, the tank, the evaporator, and a heater. A defrost circuit fluidly connects the compressor, the tank, the evaporator, and the heater. The tank has a base and the first opening is spaced a first distance above the base and the third opening is spaced a second greater distance above the base.

Abstract: The present invention relates to a device and method for operating a refrigeration cycle without icing of the evaporator of the device.

Abstract: In an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced into an evaporator through a bypass passage while bypassing an ejector and a gas-liquid separator in a defrosting operation for defrosting frost generated on the evaporator. In addition, a throttle or a check valve is provided in a refrigerant passage from the gas-liquid separator to a refrigerant inlet side of the evaporator. Accordingly, in the defrosting operation, the hot gas refrigerant from the compressor can be accurately introduced into the evaporator through the bypass passage without flowing toward the gas-liquid separator.

Abstract: A hot gas defrost system for a refrigeration cycle, including at least a compressor, reversing valve, condenser and evaporator. During defrost, the reversing valve directs the superheated refrigerant from the compressor to the evaporator. The hot gas traverses the evaporator coil which, in turn, causes the ice or frost to melt. The hot gas defrost refrigeration system may also include a receiver to store the refrigerant during the refrigeration and defrost cycles.

Abstract: A high-speed evaporator defrost system is described. It comprises a defrost conduit circuit having valves for directing hot high pressure refrigerant gas from a discharge line of a compressor and through a refrigeration coil of an evaporator of a refrigeration system during a defrost cycle thereof, and back to a suction header of the compressor through a reservoir of the refrigeration system to remove any liquid refrigerant contained in the refrigerant gas prior to returning to the suction header. The reservoir has an internal pressure which is generally at the same pressure as that of a suction header of the compressor thereby creating a pressure differential across the refrigeration coil sufficient to accelerate the hot high pressure refrigerant gas in the discharge line through the refrigeration coil of the evaporator to quickly defrost the refrigeration coil. The reservoir is repressurized after the defrost cycle for using the reservoir in a refrigeration cycle.

Abstract: A method using controlled forced-convection to couple (or de-couple) a refrigerant-evaporator thermally to a refrigerated compartment, and a method to use heat from a fresh food compartment (or other compartment maintained above 0C) of a two or more temperature refrigeration appliance to defrost a freezer evaporator automatically without using a controller or heater. When thermally coupled to its compartment, an evaporator can provide efficient cooling to the compartment. The ability to de-couple the evaporator from its compartment enables refrigerant flow through the evaporator at significantly different temperatures than its compartment, but without significant heat transfer. This ability enables using a single refrigeration system (with one or no valves) to remove heat (sequentially) at two or more different temperatures from two or more refrigerated compartments.

Abstract: It includes a heat source side refrigerant circuit (70) having a plurality of refrigerant heat exchangers (50, 60), and a plurality of user-side refrigerant circuits (11, 21). A high pressure gas pipe (LG-H) is connected to the discharge side of outdoor compressors (41, 42) of the heat source side refrigerant circuit (70), a low pressure gas pipe (LG-L) to the suction side of the outdoor compressors (41, 42), and a liquid pipe (LL) to the liquid side of outdoor heat source side heat exchangers (45, 46). The liquid pipe (LL) is connected to one end side of each refrigerant heat exchanger (50, 60). The other end side of the respective refrigerant heat exchangers (50, 60) can be switched by three-way valves (52, 62) between a state where it is communicated to the high pressure gas pipe (LG-H) and another state where it is communicated to the low pressure gas pipe (LG-L). The liquid pipe (LL) is connected to one end side of a user-side heat exchanger (31) of the heat source side refrigerant circuit (70).

Abstract: A refrigeration system comprising a compressor for compressing a refrigerant. The compressor uses an oil for lubrication. A condenser receives the compressed refrigerant and condenses at most of the refrigerant to a liquid. A thermo-siphon vessel receives and stores refrigerant from the condenser. An oil cooler receives liquid refrigerant from the thermo-siphon vessel and uses the liquid refrigerant to cool the compressor oil. An air unit receives liquid refrigerant from the thermo-siphon vessel and uses the liquid refrigerant to cool an enclosure. A receiver receives and stores any overflow liquid refrigerant from the thermo-siphon vessel, vapor and liquid refrigerant from the oil cooler, and releases the overflow back to the air unit as needed. A valve before the receiver restricts the flow of refrigerant from the thermo-siphon vessel to maintain the pressure in the thermo-siphon vessel and receiver above a given point.

Abstract: A hot gas defrost system for a refrigeration cycle, including at least a compressor, reversing valve, condenser and evaporator. During defrost, the reversing valve directs the superheated refrigerant from the compressor to the evaporator. The hot gas traverses the evaporator coil which, in turn, causes the ice or frost to melt. The hot gas defrost refrigeration system may also include a receiver to store the refrigerant during the refrigeration and defrost cycles.

Abstract: An air conditioner comprising a refrigerant forward path branching on a discharge side of a compressor in an outdoor unit, one of the branched portions being defined by connecting a first four-way valve, a first outdoor heat exchanger and a first outdoor expansion valve to one another in this order, and the other of the branched portions being defined by connecting a second four-way valve, a second outdoor heat exchanger and a second outdoor expansion valve in this order, the path extending to an indoor unit from the respective outdoor expansion valves through a liquid-side piping, and returning to the outdoor unit from the indoor unit through a gas-side piping to branch, one of the branched portions being connected to the first four-way valve via a check valve placed in communication in a forward direction and the other of the branched portions being connected to the second four-way valve, the air conditioner being controlled such that, when heating operation is switched to defrosting operation, the second f

Abstract: A machine capable of generating and dispensing potable water is disclosed. Novel features of the inventive machine include continuous water filtration, a durable primary outer housing unit designed to minimize damage during transportation and handling, and a hot gas injection system designed to allow the generation of water from ambient air at temperatures as low as 50° F.

Abstract: An ice making machine has a water system, including a pump, an ice-forming mold and interconnecting lines therefore; a refrigeration system, including a compressor, a condenser, an expansion device, an evaporator in thermal contact with the ice-forming mold, and a receiver. The receiver has an inlet connected to the condenser, a liquid outlet connected to the expansion device and a vapor outlet connected by a valved passageway to the evaporator.

Abstract: The present disclosure relates to a refrigeration system including a compressor for compressing a refrigerant, a condenser in fluid communication with the compressor for condensing compressed refrigerant received from the compressor, and a reservoir in fluid communication with the condenser for holding condensed refrigerant received from the condenser. The system also includes a heat exchanger in fluid communication with the reservoir, an expansion device in fluid communication with the heat exchanger for decompressing cooled refrigerant received from the heat exchanger, and at least one evaporator in fluid communication with the expansion device for evaporating decompressed refrigerant received from the expansion device.

Abstract: A high-speed evaporator defrost system is comprised of a defrost conduit circuit connected to the discharge line of one or more compressors and back to the suction header through an auxiliary reservoir capable of storing the entire refrigerant load of the refrigeration system. Auxiliary reservoir is at low pressure and is automatically flushed into the main reservoir when liquid refrigerant accumulates to a predetermined level. The auxiliary reservoir of the defrost circuit creates a pressure differential across the refrigeration coil of the evaporators sufficient to accelerate the hot high pressure refrigerant gas in the discharge line through the refrigeration coil of the evaporator to quickly defrost the refrigeration coil even at low compressor head pressures and wherein the pressure differential across the coil is in the range of from about 30 p.s.i. to 200 p.s.i.

Abstract: A fan casing of window type air conditioner adapted to smoothen and form corners of outdoor casing in slow curvatures having convex and concave surfaces and to lengthen draft holes, thereby increasing amount of sucked air, reducing disturbance and resistance of air flow to decrease eddy current phenomenon and noises, and obtaining a broader accommodation spaces of compressor and the like on the concave surfaces, the fan casing comprising: convex surfaces formed facing the outdoor fan for increasing a suction amount of external air and simultaneously minimizing disturbance and reduction of air flow by increasing the length of the plurality of draft holes; and concave surfaces formed facing the condenser for obtaining a broaden accommodation space of the compressor and the like at a predetermined position at the convex surfaces and securing a larger suction area of external air.

Abstract: A reverse cycle refrigeration apparatus for air dehumidification is employed having an evaporator and a condenser and employing first and a second heat transfer coils for this purpose. Both coils are positioned in the air stream. In a first cycle the second coil functions as the evaporator for cooling and dehumidifying the air stream and accumulating frost and the first coil acts as the condenser, warming the cooled and dehumidified air stream and thawing frost having accumulated on it. In a second cycle the first coil acts as the evaporator, cooling and dehumidifying the air and providing the heat for defrost and the second coil acts as the condenser, thereby being defrosted. Dampers are provided for stopping air flow over the defrosting coil.

Abstract: In a heat pump type air conditioner, a refrigerant ejection port of a compressor in a refrigerating cycle thereof is connected to a refrigerant inflow port of an outdoor heat exchanger via a bypass pipe with a shut-off valve, and temperature sensors detect the temperatures of the refrigerant inflow and runoff port sides of an outdoor heat exchanger. In a heating operation mode, when the temperature of the refrigerant inflow or runoff port side reaches a certain value or lower that requires defrosting, the shut-off valve of the bypass pipe is "opened" to start defrosting using the hot gas bypass defrosting method.

Abstract: Method and apparatus for defrosting an evaporator in a closed loop refrigeration system are provided. In one embodiment, liquid is circulated from a receiver containing refrigerant through an evaporator in a reverse direction to normal flow and then to another evaporator in the system. Hot gas from a compressor may be used to displace the liquid to the evaporator being defrosted. Alternatively, gas from the top of the receiver may be used for displacement of the liquid. Steps are taken to insure that cold gas from the evaporator that is input to the compressor does not contain liquid. Apparatus making possible flow of liquid in reverse direction through an evaporator selected for defrosting and then to another evaporator is provided, along with apparatus for controlling the flow.

Abstract: A compression type refrigeration system having a compressor, a condenser and an evaporator positioned remotely from the condenser, a liquid feed line connecting the condenser outlet with the evaporator inlet, said feed line having a length, and an expansion device located in the liquid feed line and positioned remotely from the evaporator. Where multiple evaporators are employed a novel distributing device is employed to divide the main refrigerant stream flowing in the liquid feed line between the expansion device and the evaporators into sub-streams which flow to each of the multiple evaporators. A hot gas defrost is provided which is designed to avoid condensation of refrigerant within the defrosting evaporator.

Abstract: A heat pump system having a defrost subcircuit that draws heat from a geothermal heat source. The defrost subcircuit is connected to the outdoor air coil in parallel with the indoor coil. The system includes a control mechanism for selectively circulating refrigerant through the defrost subcircuit but not the indoor air coil during the defrost mode. The heat pump system further includes components which permit the defrost subcircuit to be pumped down when the system leaves the defrost mode.

Abstract: A method of circulating a refrigerant for defrosting comprises the steps of changing a switching valve installed at a discharge pipe and a suction pipe of a compressor to a defrosting mode according to a control signal from a controller; and directly transferring the refrigerant compressed to a high-temperature and high-pressure gas at the compressor to an evaporator to remove a frost formed on the evaporator. A refrigerator having a compressor, a condensor, a capillary tube and an evaporator, in which a refrigerant circulates through the compressor, the condensor, the capillary tube and the evaporator sequentially, in a refrigerating mode to perform cooling, comprises a switching valve installed at a discharge pipe and a suction pipe of the compressor, for changing a circulation direction of the refrigerant from the compressor to the evaporator, in a defrosting mode; and a controller for selectively controlling the switching valve to be switched to the defrosting mode or the refrigerating mode.

Abstract: A new method for defrosting a dehumidifier. The new method minimizes the formation of liquid "slugs" which can occur during normal defrosting and which can damage the compressor, and also makes the operation of the dehumidifier more efficient. In the new method, defrosting takes place with the fan running to draw warm, room air over the condenser to warm the refrigerant passing through it in reverse, to thus minimize the formation of liquid "slugs". The warm air however is prevented by baffles from passing over the evaporator where it would undesirearably pick up moisture from the melting ice on the evaporator. An apparatus for carrying out the above method is also provided.

Abstract: According to a method of cooling gases, in particular air which is drawn in through a compressor, in a compressed air arrangement the gas flows alternately through at least one of a plurality of refrigerating driers (5, 6) equipped with heat exchangers (15, 16). The gas drawn in is cooled by means of a heat exchanger (15, 16) to below 0.degree. C. over a cooling section. Whilst the gas is being cooled, the ice produced in the refrigerating drier (5, 6) is defrosted by at least one of the refrigerating driers (5, 6) or in the further refrigerating drier(s) (5, 6) by the supply of a hot refrigerant vapour. The liquid refrigerant flowing out of the refrigerating drier (5, 6) to be defrosted is introduced into a pressure and/or connection line (17, 18) of the refrigerant circuit between the inlet of the heat exchanger (15, 16) used for cooling the gas drawn in and the condenser (59), which is arranged upstream of this (these) heat exchangers, or the tank.

Abstract: A heat pump system includes, in an operable relationship for transferring heat between an exterior atmosphere and an interior atmosphere via a fluid refrigerant: a compressor; an interior heat exchanger; an exterior heat exchanger; an accumulator; and means for heating the accumulator in order to defrost the exterior heat exchanger.