Abstract: An assembly for installation in a refrigerator provides comprises an enclosure for conducting service lines therethrough and an air filter unit mounted to the enclosure. The air filter unit includes an air filter housing that contains an air filter and includes openings for the ingress of air from the refrigerator which, after passing through the air filter, is discharged to the refrigerator interior through discharge openings in the air filter housing. Means such as a fan is provided to establish a flow of air through the air filter housing. The air filter unit has utility separately from the enclosure for conducting service lines in which case the air filter housing includes first and second portions that are pivotally connected to one another. The air filter within the air filter housing is supported by one of the first and second portions of the air filter housing.

Abstract: A defrosting heater in a refrigerator with a flammable refrigerant sealed therein, including a first glass tube (53) having a heater wire (52) inside thereof, a plug (58) covering both end opening parts of the first glass tube (53) and a second glass tube (54), a lead wire (55) piercing the plug (58) and connected to an end of the heater wire (52), and a positioning plate (57) disposed on a connection part of the lead wire (55) with the heater wire (52). Flame propagation can be prevented by setting the size of a space (58b) formed by the plug (58) and the positioning plate (59) according to the sealing quantity of the flammable refrigerant and the surface temperature of the heater wire (52), and an unstable state in a defrosting mode is prevented even when the flammable refrigerant leaks.

Abstract: A system and method for de-icing a recondensor includes at least one heating element configured to melt iced particles from a recondensing system. A power delivery circuit is included configured to deliver power to the at least one resistive heating element such that the at least one resistive heating element delivers a supply of heat sufficient to melt the iced particles from the recondensing system.

Abstract: A defrosting method of an air conditioner is disclosed. The air conditioner has an indoor unit having an indoor heat-exchanger, an indoor blower fan, an auxiliary heater, an outdoor unit having an outdoor heat-exchanger, a compressor, an expansion device, and an outdoor blower fan, and a four-way valve to selectively switch a circulation direction of a refrigerant between the indoor unit and the outdoor unit such that the air conditioner is operated in a heating cycle when the four-way valve is turned off and the air conditioner is operated in a refrigerating cycle when the four-way valve is turned on. The defrosting method is selectively determined according to the number of the heating cycles of the air conditioner.

Abstract: The present invention relates to a cooling apparatus including a compressor, a condenser, a first expanding unit, a second expanding unit, a third expanding unit, a first evaporator, and a second evaporator; a first refrigerant circuit containing refrigerant discharged from the compressor and flowing into a suction side of the compressor through the condenser, the first expanding unit, the first evaporator, the second expanding unit and the second evaporator; a second refrigerant circuit containing the refrigerant passing through the condenser flowing into the suction side of the compressor through the third expanding unit and the second evaporator; a flow path control unit installed at a discharge side of the condenser, switching a refrigerant flow path so that the refrigerant passing through the condenser flows through at least one of the first and second refrigerant circuits; and a control unit selectively opening and closing the flow path control unit.

Abstract: A refrigeration device has an interior that is surrounded by a thermally insulating housing and provided with a heating device for heating the interior. The housing contains an inner chamber and a thermal insulation layer that surrounds the chamber. The inner chamber contains an opening and the heating device is mounted on a support that can be accessed from the inner chamber and at least partially covers the opening.

Abstract: Heat exchanger arrangement for a refrigerator apparatus, which evaporator comprises an evaporator tube (2) for conducting a refrigerating medium; a heat exchanger (5, 11) with at least one heat conducting member (7, 11), which is arranged in heat conducting contact with a portion of the evaporator tube and; a heat generating element (10) for defrosting the heat exchanger, which element is arranged in heat conducting contact with the heat conducting member. For optimizing defrosting, the heat-conducting member (7, 11) is arranged essentially between the heat generating element (10) and the evaporator tube (2).

Abstract: A refrigerator with an evaporator having a refrigerant pipe, and a defrosting heater placed below the evaporator and defrosting the evaporator, wherein the refrigerant pipe includes a main refrigerant pipe evaporating a refrigerant, and a heat-transfer refrigerant pipe extended from a lower part of the main refrigerant pipe so as to exchange heat, and disposed adjacent to the defrosting heater. Therefore, the refrigerator can defrost an evaporator quickly and uniformly.

Abstract: The accumulation period between defrost cycles of a refrigeration apparatus having a electrical defrost heater is calculated on the basis of energy expended to remove the ice from the coil during the previous defrost cycle. In this way, variations in the voltage level being delivered to the heater coil are taken into account and the degree of ice build-up on the coil between defrost cycles can be more accurately controlled.

Abstract: A refrigerant cycle is provided with a transient mode for moving from a defrost cycle back to steady state operation. In particular, some default position of the expansion device is selected when defrost cycle ends. The evaporator is hot at the end of defrost cycle, and might otherwise suggest an increased flow of refrigerant through the expansion device, which could be undesirable. Thus, a control for the inventive system moves the expansion device to a defrost transient position, with the defrost transient position restricting the flow of refrigerant to a value that would be less than that dictated by the high temperature of the evaporator. At some period of time after the end of the defrost mode, the refrigerant cycle can be returned to state steady operation.

Abstract: A refrigeration system trapping device and method traps airborne liquid water and ice particles before they accumulate on evaporator coils, reducing frost deposition on the evaporator. The frost on the trapping device can be actively removed.

Abstract: A system for refrigeration of products includes a case having a compartment defining a space configured to receive the products. A first heat exchanger is configured to cool a fluid communicating with the space to cool the objects. A second heat exchanger is configured to receive a heat supply from an air source to warm the fluid. At least one coolant supply line and at least one coolant discharge line are configured to direct the fluid in communication with the space.

Abstract: Disclosed is a refrigerator comprising an outer casing defining an outer appearance thereof, and an inner casing accommodated in the outer casing, forming a storage chamber, further comprising a heat pipe unit having an evaporator pipe disposed to surround at least one portion of the inner casing, forming a refrigerant path, a heater pipe disposed in parallel with the evaporator pipe, and a connection part connecting the evaporator pipe and the heater pipe, enabling a heat transfer therebetween. With this configuration, there is provided a refrigerator enhancing cooling, ripeness and defrost performances and the productivity.

Abstract: A temperature controlled service case for storage and display of chilled or frozen products, including at least one compartment for product storage, at least one access opening providing entrance to the compartment, at least one shelf within the compartment for holding product, and refrigeration operatively associated with the compartment for maintaining a selected temperature therein. The refrigeration includes at least one cooling coil above the shelf with a cooling medium flowing therethrough, and cooling within the shelf with a cooling medium flowing therethrough. Coolant supply is also provided for supplying cooling medium to the cooling coil and shelf.

Abstract: A defrosting heater in a refrigerator with a flammable refrigerant sealed therein, including a first glass tube (53) having a heater wire (52) inside thereof, a plug (58) covering both end opening parts of the first glass tube (53) and a second glass tube (54), a lead wire (55) piercing the plug (58) and connected to an end of the heater wire (52), and a positioning plate (57) disposed on a connection part of the lead wire (55) with the heater wire (52). Flame propagation can be prevented by setting the size of a space (58b) formed by the plug (58) and the positioning plate (59) according to the sealing quantity of the flammable refrigerant and the surface temperature of the heater wire (52), and an unstable state in a defrosting mode is prevented even when the flammable refrigerant leaks.

Abstract: An apparatus and method for defrosting an evaporator of a refrigeration sealed system is described. The system includes a controller operatively coupled to an evaporator fan, a condenser fan and a defrost heater, and the method includes operating the sealed system until a selected time till defrost interval expires, initiating a defrost cycle when the time till defrost interval expires, and selectively operating the sealed system to raise a temperature of the evaporator while the defrost heater is inactivated.

Abstract: Heater-evaporator has a hollow refrigerator fluid evaporator body with which is incorporated a heater. The body can enclose the heater, which is separate from the body, or the body and the heater can be part of one another. The heater can be heated by any suitable means, to include electrical resistance and/or induction. The invention can be utilized in refrigeration and temperature control, to include, for example, in laboratory test devices requiring refrigeration and temperature control.

Abstract: A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits. A hot gas re-heat circuit having a hot gas re-heat 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. Humidity control is only 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 re-heat circuit for dehumidification and activates a second refrigerant circuit to provide cooling capacity. During a second stage cooling operation using two or more refrigerant circuits and having a high cooling demand, the request for humidity control is suspended and is initiated only upon the completion of the second stage cooling demand.

Abstract: An evaporator assembly includes a support housing for mounting to an internal compartment of a delivery truck or trailer. At least one evaporator coil mounts to the support housing along with at least one cooling fan. Electric heating strips are attached to the bottom of the evaporator coils to heat the compartment and defrost the evaporator coils. A plastic outer skin incorporates a drain pan to collect condensation and moisture dripping from the evaporator coils during the defrost cycle. A heat shield is attached between the heating strips and the plastic outer covering to prevent heat from damaging the plastic outer covering.

Abstract: A refrigerator with a multipurpose storage chamber and a control method. In the refrigerator, the flow of cool air to the multipurpose storage chamber is selectively controlled in accordance with a variety of operational modes. In order to accomplish such a cool air flow control, a refrigerating compartment fan and a damper are provided at positions above a refrigerating compartment evaporator. In addition, a flap, controlled at an open angle thereof, is provided at the inlet of an air guide path guiding the cool air to the multipurpose storage chamber. The multipurpose storage chamber of this refrigerator can thus effectively be used to store a variety of foods in accordance with storage characteristics of the foods. In addition, a thawing mode operation of the refrigerator is performed under the condition that it is not necessary to perform a refrigerating compartment cooling operation.

Abstract: A refrigeration appliance is provided having a first compartment to be cooled, at least one evaporator in heat transfer association with the first compartment, a defrost heater associated with the evaporator, a temperature sensor associated with the evaporator, and a control circuit. The control circuit is arranged to selectively energize the defrost heater during a defrost cycle, selectively deenergize the defrost heater during the defrost cycle, generate a timing signal while the defrost heater is deenergized during the defrost cycle, and the control circuit is arranged to receive an input from the temperature sensor, and an accumulation of time from the timing signal.

Abstract: A transport temperature control apparatus includes a refrigeration circuit and a heat exchanger having an air inlet and an air outlet in fluid communication with a conditioned space. An evaporator coil extends through the heat exchanger between the inlet and air outlet and is fluidly connected to the refrigeration circuit. A divider defines a first portion of the evaporator coil and a second portion of the evaporator coil. A first fan is housed in the heat exchanger and is adjacent the first portion. The first fan has a first operating condition for directing air across the evaporator coil in a first direction and a first non-operating condition. A second fan is housed in the heat exchanger and is adjacent the second portion. The second fan has a second operating condition for directing air across the evaporator coil in a second direction and a second non-operating condition.

Abstract: A transport temperature control apparatus includes a refrigeration circuit and a heat exchanger having an air inlet and an air outlet in fluid communication with a conditioned space. An evaporator coil extends through the heat exchanger between the inlet and air outlet and is fluidly connected to the refrigeration circuit. A divider defines a first portion of the evaporator coil and a second portion of the evaporator coil. A first fan is housed in the heat exchanger and is adjacent the first portion. The first fan has a first operating condition for directing air across the evaporator coil in a first direction and a first non-operating condition. A second fan is housed in the heat exchanger and is adjacent the second portion. The second fan has a second operating condition for directing air across the evaporator coil in a second direction and a second non-operating condition.

Abstract: An apparatus and method for operating an appliance in an energy conservation mode is described. The appliance includes a number of peripheral devices and auxiliary components ancillary to main operation of the appliance, and the method includes reducing power to at least some of the peripheral devices and auxiliary components in an energy conservation mode, thereby reducing energy consumption by the peripheral devices and auxiliary components.

Abstract: An alternating electric field at an ice interface generates conductivity AC with a frequency greater than 1000 Hz in interfacial ice. Typically, a first electrode and a second electrode define an interelectrode space containing a stack of freezer packages. Each freezer package has an outer dielectric film and a continuous inner conductive layer coating the inside of the dielectric film. An AC power source provides a voltage of about 10 to 500 volts across the electrodes. The first and last freezer packages in the stack are proximate to the first and second electrodes, respectively. The AC voltage generates conductivity AC in the inner conductive layers. An alternating electric field between adjacent conductive layers generates conductivity current in the ice, resulting in Joule heat, which melts the ice.

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: An evaporator assembly includes a support housing for mounting to an internal compartment of a delivery truck or trailer. At least one evaporator coil mounts to the support housing along with at least one cooling fan. Electric heating strips are attached to the bottom of the evaporator coils to heat the compartment and defrost the evaporator coils. A plastic outer skin incorporates a drain pan to collect condensation and moisture dripping from the evaporator coils during the defrost cycle. A heat shield is attached between the heating strips and the plastic outer covering to prevent heat from damaging the plastic outer covering.

Abstract: A refrigerator having at least one storage compartment, an evaporator cooling the storage compartment, a compressor, and a compressor driving part supplying electric power to the compressor, comprising: a heater heating a part of the refrigerator; a heater driving part supplying electric power to the heater; a temperature sensor sensing an inside temperature of the storage compartment and a controller controlling the heater driving part to turn off the heater when the inside temperature of the storage compartment sensed by the temperature sensor rises beyond a preset temperature in a state that the compressor is operated by the compressor driving part and cool air is supplied to the storage compartment through the evaporator. With this configuration, a refrigerator is provided which can minimize a rise in the inside temperature thereof when the compressor stops due to trouble, and restarts the compressor stably.

Abstract: An apparatus and method for operating an appliance in an energy conservation mode is described. The appliance includes a number of peripheral devices and auxiliary components ancillary to main operation of the appliance, and the method includes reducing power to at least some of the peripheral devices and auxiliary components in an energy conservation mode, thereby reducing energy consumption by the peripheral devices and auxiliary components.

Abstract: The present invention relates to a defroster for an evaporator of a refrigerator. A defrosting heater 34 is installed close to a refrigerant tube 32 in which a refrigerant flows. The defrosting heater 34 is constructed to generate different amounts of heat according to positions in an evaporator 30. To this end, a hot wire 44 of the defrosting heater 34 has different wound pitches according to the positions in the evaporator 30. For example, the pitch of the hot wire 44 on an inlet side through which air that has circulated in the refrigerator is introduced toward the evaporator 30 is set to be small in order to generate a relatively large amount of heat. Since air that has circulated in a refrigerating chamber of the refrigerator entrains a relatively large amount of moisture, the pitch of the hot wire 44 is relatively small at a region in the evaporator 30 by which air that has circulated in the refrigerating chamber passes.

Abstract: Disclosed is a refrigerator for kimchi, including a main body having at least one cooling chamber, an evaporator for cooling the cooling chamber, a compressor for supplying a refrigerant to the evaporator, a refrigerant tube for supplying the refrigerant from the compressor to the evaporator, and a valve installed in the refrigerant tube for controlling the supply of the refrigerant. The kimchi refrigerator further comprises a temperature sensor for detecting the temperature of the cooling chamber; a heater installed in the main body, heating and defrosting the evaporator; and a controller for controlling the heater to perform the defrosting operation when the temperature of the cooling chamber detected by the temperature sensor is not more than a predetermined temperature. With this configuration, a layer of frost frozen in the evaporators can be removed effectively, to thereby further enhance a cooling efficiency and save a consumed power.

Abstract: A method and apparatus for defrosting an evaporator of a refrigeration system including a defrost heater and a controller operatively connected to the evaporator and a defrost heater is provided. The method comprises initiating a defrost cycle to energize the defrost heater to defrost the evaporator, monitoring a temperature of the evaporator, terminating the defrost cycle by de-energizing the defrost heater when a low temperature termination point of the evaporator is reached when in a low temperature defrost cycle, and terminating the defrost cycle by de-energizing the defrost heater when a high temperature termination point of the evaporator is reached when in a high temperature defrost cycle.

Abstract: The present invention relates to a defroster for an evaporator of a refrigerator. A defrosting heater 34 is installed close to a refrigerant tube 32 in which a refrigerant flows. The defrosting heater 34 is constructed to generate different amounts of heat according to positions in an evaporator 30. To this end, a hot wire 44 of the defrosting heater 34 has different wound pitches according to the positions in the evaporator 30. For example, the pitch of the hot wire 44 on an inlet side through which air that has circulated in the refrigerator is introduced toward the evaporator 30 is set to be small in order to generate a relatively large amount of heat. Since air that has circulated in a refrigerating chamber of the refrigerator entrains a relatively large amount of moisture, the pitch of the hot wire 44 is relatively small at a region in the evaporator 30 by which air that has circulated in the refrigerating chamber passes.

Abstract: A refrigerator with a multipurpose storage chamber and a control method. In the refrigerator, the flow of cool air to the multipurpose storage chamber is selectively controlled in accordance with a variety of operational modes. In order to accomplish such a cool air flow control, a refrigerating compartment fan and a damper are provided at positions above a refrigerating compartment evaporator. In addition, a flap, controlled at an open angle thereof, is provided at the inlet of an air guide path guiding the cool air to the multipurpose storage chamber. The multipurpose storage chamber of this refrigerator can thus effectively be used to store a variety of foods in accordance with storage characteristics of the foods. In addition, a thawing mode operation of the refrigerator is performed under the condition that it is not necessary to perform a refrigerating compartment cooling operation.

Abstract: A temperature controlled service case for storage and display of chilled or frozen products, including at least one compartment for product storage, at least one access opening providing entrance to the compartment, at least one shelf within the compartment for holding product, and refrigeration operatively associated with the compartment for maintaining a selected temperature therein. The refrigeration includes at least one cooling coil above the shelf with a cooling medium flowing therethrough, and cooling within the shelf with a cooling medium flowing therethrough. Coolant supply is also provided for supplying cooling medium to the cooling coil and shelf.

Abstract: A temperature controlled service case for storage and display of chilled or frozen products, including at least one compartment for product storage, at least one access opening providing entrance to the compartment, at least one shelf within the compartment for holding product, and refrigeration operatively associated with the compartment for maintaining a selected temperature therein. The refrigeration includes at least one cooling coil above the shelf with a cooling medium flowing therethrough, and cooling within the shelf with a cooling medium flowing therethrough. Coolant supply is also provided for supplying cooling medium to the cooling coil and shelf with separate coolant supply and discharge lines from the coolant supply to the cooling coil and shelf. In accordance with a further embodiment, the shelf is divided into separate sections. In accordance with a still further embodiment, means are provided to warm the coolant for at least one of said cooling coil and shelf.

Abstract: An apparatus for cooling a computer's microprocessor includes a thermal housing having a receiving aperture in alignment with the microprocessor. A thermal head is inserted into and guided by the receiving aperture such that a cooled surface of the thermal head will begin thermal contact with the microprocessor. The thermal head defines a flow channel for passage of a refrigerant fluid so as to cause cooling at the cooled surface. A clamping arrangement is attached to the mounting structure to maintain the thermal head in operative position. The apparatus further includes a refrigeration system in fluid communication with the flow channel of the thermal head to supply refrigerant fluid thereto.

Abstract: A vapor compression system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.

Abstract: A dehydrating device used in evaporator of a refrigeration (or an air conditioner) system, in which the evaporator includes a heat-exchanging assembly, and the dehydrating device includes an electrode member mounted under lower end of the heat-exchanging assembly at a suitable space, a positive voltage source, a negative voltage source, and two time controllers connected with the positive and negative voltage sources respectively; the two voltage sources are connected with the electrode member and the lower end of the heat-exchanging assembly respectively so as to form into an electric field therebetween; the two time controllers will provide a time difference so as to control the two voltage sources to furnish a power supply on a periodical switching basis; then, the condensed water under the heat-exchanging assembly will be pulled and removed from the surface of the heat-exchanging assembly by means of the periodical change of the electric field.

Abstract: An evaporator having defrosting capabilities for space-saving and hard-to-reach installations and for connecting to a condensing unit with a condensing coil and a compressor. The evaporator includes a center tube, a middle tube, and an outer tube. The center tube has a refrigerant inlet for supplying a refrigerant before being evaporated, and conducting the refrigerant in a first direction opposite to the refrigerant inlet of the center tube. The middle tube concentrically receives the center tube and defines a first passage therebetween for conducting a hot injected gas for performing a mild, but positive, defrost of the evaporator as the evaporator continues to operate.

Abstract: A device for defrosting the finned cooling assembly of a refrigeration system having an ellipsoid transparent polymer material housing a light source. The light source is positioned substantially in correspondence with one of the focal points of the ellipsoid. A sensor for the light beam radiated by the light source and reflected by an inner surface of the ellipsoid recognize variations in the luminous intensity of the beam caused by the formation of frost along the path of the light beam. A plurality of finned cooling assemblies are activated by the signal emitted by the sensor.

Abstract: A device that includes two heat exchangers, one attached to the ambient or to the hot parts of the refrigeration unit including a reservoir filled with high sensible heat liquid and the other attached to the evaporator of the unit, a closed loop circuit between the two heat exchangers and a pump that can circulate the liquid during defrost cycle, providing a controllable, intensive heat transfer from the warmed liquid to the evaporator coil in order to melt the frost deposits.

Abstract: An evaporator coil for a refrigeration system which includes a plurality of contiguous metal fins which include means for providing conductive heat to the fins on demand or under a predetermined conditions. The heating means care in the form of a plurality of interconnected electrically heated rods which are in direct contact with the outer surface of the fins of the evaporator coil.

Abstract: A vapor compression system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.

Abstract: An end cap for a defrost heater is shown in which a positive locking mechanism is used to allow the lead wires to extend downward from the end cap. This increases the end cap's resistance to moisture and simplifies the design, thus lowering manufacturing cost. The end cap is also shown with a vertical vent that overlaps the retaining bore to significantly increase venting area over prior designs. The positive locking mating tab and the vent are located in two separate, but adjacent, vertical passages.

Abstract: A refrigerator having a shutting device for preventing flow of air between an evaporator and a fresh food compartment is disclosed. The shutting device has a shutting member for shutting a space that the evaporator is installed against a cooling compartment, and a motor for driving the shutting member. During a defrosting operation and when the door is open, cool air discharge ports are closed by the shutting member. Thus, the temperature rise of the fresh food compartment due to the heat from a defrosting heater, and the loss of cool air and the generation of frost on the evaporator due to the opening of the door are prevented.

Abstract: A refrigerator which has a device for opening/closing cool air discharge ports is disclosed. The device includes plates for opening/closing the ports, and an operation member having racks for driving the plates, and a motor for driving the operation member. The heat exchange between an evaporator and the outside warm air is prevented during the defrosting operation and when a door is open. Hence the cooling efficiency is enhanced and the frost caused by the outside warm air is not generated on the evaporated.

Abstract: A refrigerator having an apparatus for defrosting. The refrigerator provides an apparatus for defrosting which uses a wasted heat from a compressor. The apparatus has a container placed on an upper surface of the compressor and an antifreezer solution for absorbing and storing the wasted heat from the compressor by performing a heat exchange. A pipe and a pump for circulating the fluid via a space section is provided. In the space section, the pipe is formed with a bending portion so as to transfer a heat to a surrounding air. In addition, a valve for preventing a high temperature air from flowing into a freezer compartment while a defrost operation is being carried out, and a plate for preventing a cabinet from being melted are provided.

Abstract: A refrigerator for improving a cooling efficiency. The refrigerator has a cabinet having a refrigerating chamber, a freezing chamber, and an evaporator chamber which is disposed at a rear portion of the freezing chamber, an evaporators which generates a chilled air and has a helical shape forming a conical space portion therein, a blower assembly coaxially disposed at a rear of the evaporator so as to blow an air towards the evaporator, and a heater installed in the conical space portion of the evaporator so as to remove a frost adhering to the evaporator. The refrigerator can effectively make a heat-exchange between the evaporator and the air so that the cooling efficiency is improved. Since the turbulent air flow is introduced into the freezing chamber, the freezing chamber can be uniformly cooled and since the heater is coaxially disposed in the evaporator, the heater can uniformly heat the evaporator, so the defrosting a frost from the evaporator is effectively carried out.

Abstract: An apparatus and improved method for defrosting of the refrigeration unit of a refrigerated vending machine are disclosed. A damper controls flow of heated defrosting air in the refrigeration unit during a defrosting cycle to prevent the heated air from exiting out of the refrigerated air duct leading to the refrigerated compartment of the vending machine, thereby maintaining the desired ambient air temperature within the refrigerated compartment.