Defrosting Or Frost Inhibiting Patents (Class 62/80)
  • Publication number: 20030205371
    Abstract: A heat exchange method and apparatus having a cooled fluid flowing in contact with a first surface of a heat exchange wall and a cooling fluid flowing in contact with a second surface of the wall. At least one temperature sensor is located to directly monitor the temperature of the first surface. Flow of the cooling fluid is throttled when the temperature of the first surface drops at least 50 degrees below the freezing temperature of the cooled fluid.
    Type: Application
    Filed: December 6, 2001
    Publication date: November 6, 2003
    Inventors: James Richard Lines, Alan Earl Smith, Lawrence Michael Saupe, Lance Lee Frens
  • Patent number: 6626004
    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.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: September 30, 2003
    Assignee: LG Electronics Inc.
    Inventor: Won-Bok Lee
  • Patent number: 6609388
    Abstract: The invention provides a method of defrosting an evaporator coil of a transport temperature control unit. The transport temperature control unit may be operable to circulate refrigerant through the evaporator coil for cooling a conditioned space within a transportable vehicle and may be operable to maintain an air temperature of the conditioned space within a range of a desired temperature. The method may include sensing the air temperature of the conditioned space, enabling a warm load defrost when the air temperature of the conditioned space is greater than the desired temperature, initiating a first defrost cycle for removing condensate from the evaporator coil and terminating the first defrost cycle. The first defrost cycle has a defrost duration time. The method may also include establishing a defrost interval time dependent on the defrost duration time and initiating a second defrost cycle after the defrost interval time expires.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: August 26, 2003
    Assignee: Thermo King Corporation
    Inventor: Jay L. Hanson
  • Patent number: 6604577
    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.
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: August 12, 2003
    Inventor: Eric P. Mulder
  • Patent number: 6601396
    Abstract: Methods and apparatus for freezer defrost, which are particularly suited for an automated system, include the formulation of algorithms utilized for this purpose. The algorithms are included in the firmware of an embedded controller and operate the freezer defrost cycle at temperature lows for increased efficiency. An application of the freezer defrost method and apparatus is also disclosed.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: August 5, 2003
    Assignee: Kendro Laboratory Products, LP
    Inventors: Richard H. Bair, III, Chuan Weng
  • Patent number: 6595019
    Abstract: The present invention relates to a mechanical means for defrosting plates used in cold storage. Frost reduces the transfer of heat to the plates and partially or totally obstructs the passage of air. Several methods are used to remove frost from plates: hot water, sprayed steam, hot gas, heating elements. In the present invention, scrapers sweep the surface of the plates to remove the frost. This method allows to remove the frost while the plates are being discharged, which improves the performance of the plates and does not affect the residual charge of the plates. The proposed defrosting system is made up of vertical scrapers located on either side of the plates. The upper and lower extremities of the scrapers are fastened to scraper supports. These supports move along tubular guide bars which are parallel to and located beneath and above the plates.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: July 22, 2003
    Assignee: Frygy Cube International Inc.
    Inventors: Jocelyn Millette, Pierre Archambault, Jean Baribeault
  • Publication number: 20030131614
    Abstract: A refrigerator which uses a microcomputer having a common input port for a plurality of temperature sensing devices, and a method of controlling the same. In the refrigerator, inexpensive bimetals are used as one or more of the temperature sensing devices to sense a defrost temperature of the refrigerator. Accordingly, the manufacturing cost of the refrigerator is reduced. Furthermore, because the refrigerator is provided with the common input port for the temperature sensing devices, a circuit construction thereof is simplified.
    Type: Application
    Filed: October 28, 2002
    Publication date: July 17, 2003
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Seong-Wook Jeong
  • Patent number: 6591626
    Abstract: A water removal device for refrigeration system comprises an electrode and a voltage source; the voltage source provides voltage for the electrode, which is located under the evaporator of the refrigeration system. Through the electric effect produced by the electrode, the condensed water condensed on the evaporator can be swiftly removed, a result that thoroughly takes advantage of the heat transfer function of the evaporator. In addition, there shall not be any electricity-discharging sparks between the electrode and the evaporator, thus assuring the normal operation of the refrigeration system.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: July 15, 2003
    Assignee: Industrial Technology Institute
    Inventors: Wei-Yueh Cheng, Shih-Pei Lin
  • Publication number: 20030115899
    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.
    Type: Application
    Filed: December 10, 2002
    Publication date: June 26, 2003
    Applicant: LG Electronics Inc.
    Inventor: Lee Won-Bok
  • Patent number: 6539728
    Abstract: There is provided a hybrid heat pump system. The system includes (i) a membrane permeator having a permselective membrane capable of selectively removing vapor from a vapor-containing gas to yield a dry gas, (ii) a heat pump having (a) an internal side for exchanging thermal energy with a process fluid, (b) an external side for exchanging thermal energy with an external environment, and (c) a thermodynamic mechanism for pumping thermal energy between the internal side and the external side in either direction, (iii) means for conveying the vapor-containing gas into the membrane permeator, and (iv) means for routing the dry gas to either of the internal side or the external side.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: April 1, 2003
    Inventor: Amos Korin
  • Patent number: 6526767
    Abstract: An automatic defrost system for a refrigerating device, comprising, in a cabinet, an evaporator and a condenser, and a defrost air circuit having: a first circuit portion; a second circuit portion receiving a certain defrost airflow from the first circuit portion and positioned adjacent to the condenser, in order to be heated by the latter; a third circuit portion, which is positioned adjacent to the evaporator, so as to selectively heat it when the heated defrost airflow passes through the second circuit portion and to conduct the defrost airflow to the first circuit portion; and a valve means, which selectively permits the passage of the defrost airflow from the second circuit portion to the third circuit portion.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: March 4, 2003
    Assignee: Mul'Tibras S. A. Eletrodomesticos
    Inventor: Luiz Antonio Diemer Lopes
  • Patent number: 6502409
    Abstract: A system and method for controlling refrigeration including a simulated product temperature sensor operable to measure a simulated product temperature from a refrigeration case and a transceiver in communication with said simulated product temperature sensor and operable to wirelessly transmit data. A receiver receives the wirelessly transmitted data and a controller in communication with the receiver controls the refrigeration system based upon the wirelessly transmitted data from the refrigeration case.
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: January 7, 2003
    Assignee: Computer Process Controls, Inc.
    Inventors: William Gatling, Herb Rippe, Jim Chabucos, Abtar Singh
  • Publication number: 20020170909
    Abstract: An electrical conductor and a gas-filled layer are located at or near the surface of an object being deiced. The conductor carries an AC voltage that generates an alternating electric field in the gas-filled layer. A conductive layer increases the electric field strength in the gas-filled layer between the electrical conductor and the conductive layer. The alternating electric field causes electric breakdown of gas and plasma-formation in the gas-filled layer. The plasma absorbs energy released during electric discharge through the plasma, which heats ice, causing it to melt. The alternating electric field typically has a field strength in a range of about from 1 to 100 kV/cm. The AC voltage typically has an amplitude in a range of about from 10 kV to 1300 kV, and a frequency in a range of about from 50 Hz to 1 MHz. The gas-filled layer includes a plasma-forming gas selected from, among others, air, nitrogen and argon.
    Type: Application
    Filed: January 9, 2002
    Publication date: November 21, 2002
    Inventor: Victor F. Petrenko
  • Publication number: 20020148240
    Abstract: A defrost control system detects the variation in flow rate of refrigerant through an evaporator 8 while the flow is regulated to achieve a desired level of superheat at the outlet of the evaporator 8. When the flow rate becomes unstable, defrosting of the evaporator 8 is triggered.
    Type: Application
    Filed: January 15, 2002
    Publication date: October 17, 2002
    Inventor: John Michael Walmsley Lawrence
  • Patent number: 6466438
    Abstract: A device for assisting the cooling of computers, especially laptop computers, provides material having an upper surface distributed over at least two levels, preferably a corrugated surface, whereby it contacts the base of the laptop over only a part of said base, permitting the free passage of air across the support and between the laptop and the support, said support being formed from a material of high thermal conductivity, with a surface adapted for rapid transfer of heat between the material and air passing over said surface.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: October 15, 2002
    Inventor: Sui-Lin Lim
  • Publication number: 20020078696
    Abstract: There is provided a hybrid heat pump system. The system includes (i) a membrane permeator having a permselective membrane capable of selectively removing vapor from a vapor-containing gas to yield a dry gas, (ii) a heat pump having (a) an internal side for exchanging thermal energy with a process fluid, (b) an external side for exchanging thermal energy with an external environment, and (c) a thermodynamic mechanism for pumping thermal energy between the internal side and the external side in either direction, (iii) means for conveying the vapor-containing gas into the membrane permeator, and (iv) means for routing the dry gas to either of the internal side or the external side.
    Type: Application
    Filed: December 4, 2001
    Publication date: June 27, 2002
    Inventor: Amos Korin
  • Publication number: 20020069659
    Abstract: The present invention provides a compound type Kim-chi refrigerator having a heater composed of the electrically heated wire to the backside of a vertical partition wall defining vegetable chamber for maintaining the temperature of the vegetable chamber within a predetermined temperature range and removing the frost within the vegetable chamber. The compound type Kim-chi refrigerator according to the present invention comprise a heater 9 attached to the lower part of the condensed water vent formed on the vertical partition wall 6b defining the vegetable chamber 61 to remove the frost and heat the vegetable chamber 61 properly to the predetermined temperature range.
    Type: Application
    Filed: September 5, 2001
    Publication date: June 13, 2002
    Inventor: Young-gil Lee
  • Patent number: 6378315
    Abstract: A system and method for controlling refrigeration including a temperature sensor operable to measure a temperature from a refrigeration case and a transceiver in communication with the temperature sensor and operable to wirelessly transmit data. A repeater receives the wirelessly transmitted data and further wirelessly transmits the data to a receiver. A controller in communication with the receiver controls the refrigeration system based upon the wirelessly transmitted data from the refrigeration case. The refrigeration case also includes a mode switch for suspending temperature reading and control for a period of time. For example, the mode switch can be used by an operator during cleaning or maintenance of the refrigerator case. Temperature control algorithms are used by the controller, and include: dead-band range (DB), proportional/integral (PI), proportional/integral/differentiation (PID) and fuzzy-logic (FL).
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: April 30, 2002
    Assignee: Computer Process Controls Inc.
    Inventors: Scott Michael Gelber, John Aggers, Abtar Singh
  • Patent number: 6324853
    Abstract: A de-icing system operable to facilitate the removal of ice from the door (18) and closure surface (22) of a low temperature refrigeration or ultra-low freezer device (10) and to thereby ensure proper operation of the device (10) and protect its contents. The de-icing system employs manually activated heaters (32) and a timing circuit (38) to thaw the ice. Because the de-icing system focuses heat only on specific, ice-sensitive areas, the temperature of the freezer's interior compartment (14) remains constant so that the contents need not be removed during the de-icing process. In use, an operator activates the de-icing system a few minutes prior to opening the freezer door (18). When the door (18) is opened, the melted or loosened ice can be removed with a soft cloth. If the operator forgets that the heaters have been activated, the timing circuit (38) automatically terminates the de-icing process and stops the heaters (32) before the freezer's interior storage temperature has been affected.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: December 4, 2001
    Assignee: SPX Corporation
    Inventors: Allan D. Kelly, Paul Steinhoff
  • Patent number: 6318095
    Abstract: A control processor controls an outdoor coil defrost cycle on a reversible heat pump by continuously monitoring the difference between the outdoor coil temperature and the outdoor air temperature. When specified preconditions are met and this difference exceeds a target value, the defrost cycle is initiated.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: November 20, 2001
    Assignee: Carrier Corporation
    Inventors: Charles Z. Guo, Raymond A. Rust, Jr.
  • Patent number: 6298679
    Abstract: A water removing mechanism for the evaporator in a refrigeration system in which an electrode element is disposed beneath the evaporator and a pulse voltage source is provided to connect the evaporator and the electrode element to generate an electric field with high voltage and low current between the evaporator and the electrode element, causing water condensed on the surface of the fins of evaporator to bear negative charge and the electrode element to bear positive charge and thereby allowing the water on the evaporator to be driven by the electric field to leave the evaporator at an accelerated speed.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: October 9, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: Wei-Yueh Cheng, Shih-Pei Lin
  • Patent number: 6283725
    Abstract: Method and apparatus for heating gases cooled by an aftercooler that receives hot gases from a compressor. The method includes the steps of directing at least a portion of said hot gases to means for bypassing the aftercooler, and using the bypass means to direct hot gases to a location that receives cooled gases from the aftercooler. The hot gases are used at the location to heat the cooled gases when ambient temperature is at or below freezing, and are used downstream from the aftercooler when moisture freezes in the aftercooler.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: September 4, 2001
    Assignee: Westinghouse Air Brake Company
    Inventors: Walter E. Goettel, Brian L. Cunkelman, Daniel G. Wagner, Roger Drummond
  • Patent number: 6226995
    Abstract: A frost control system for preventing the accumulation of frost on components of a freezer door assembly is disclosed. The system comprises a movable door disposed between a cold space and a warm space, and a header assembly. The header assembly comprises an air mover and an air inlet adapted for drawing air from the cold space to an inlet of the air mover. A conduit is provided for conducting air from an outlet of the air mover to a region of the warm space proximate to the door, and a thermostatically-controlled heater is disposed within the conduit. The conduit includes a heated air exhaust vent. Also provided is control circuitry for managing the operation of the heater and air mover.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: May 8, 2001
    Assignee: Rytec Corporation
    Inventors: Walenty Kalempa, Brian Norbert Drifka
  • Patent number: 6047554
    Abstract: The present invention relates to an optimum defrosting cycle method of an inverter refrigerator. In the past, a defrosting cycle setting method for a conventional refrigerator with which a defrosting operation was carried out when the operation time of a compressor reaches a certain amount of time(e.g. 7 hours) by simply accumulating the operation time of the compressor. However, there have been drawbacks since the operation speed of a compressor varies for a high speed, mid speed, and low speed according to the surrounding condition when the conventional method is applied to the inverter refrigerator, it is not relevant to set the defrosting cycle by simply accumulating the operation time.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: April 11, 2000
    Assignee: LG Electronics Inc.
    Inventor: O Bong Choi
  • Patent number: 5996354
    Abstract: In order to cool a room, a cooling element fitted in the ceiling region is cooled to below the freezing point, preferably to about -40.degree. C., during the cooling phases so that condensate forming thereon freezes immediately. During regeneration phases when the room is not in use, the cooling element is defrosted and the melted condensate is caught in a condensate tray beneath the cooling element and drained via a discharge. The great temperature difference between the room to be cooled and the cooling element also makes it possible to obtain a strong cooling effect with a small cooling element, especially by indirect radiation exchange between the room and the cooling element via an intermediate ceiling. In addition, the air in the room is dehumidified since water vapor is deposited on and bonded to the cooling element in the form of ice.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: December 7, 1999
    Assignee: Barcol-Air AG
    Inventors: Helmuth Sokolean, Klaus Roschmann
  • Patent number: 5950439
    Abstract: A method and system for controlling a refrigeration system is operative to reduce a system pressure of the refrigeration system. The system pressure is reduced to reduce a start-up current associated with a compressor motor of the refrigeration system. Another method and system for controlling a refrigeration system includes steps of performing an operation of the refrigeration system in accordance with at least one parameter, sensing an amount of energy utilized in at least a portion of the refrigeration system to perform the operation, and modifying the at least one parameter to reduce the amount of energy required to subsequently perform the operation.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: September 14, 1999
    Assignee: Nartron Corporation
    Inventors: Gregory Eric Peterson, Christian Jens Andersen
  • Patent number: 5927083
    Abstract: A defrost control for a heat exchange system initiates a defrost of the evaporator coil when a predetermined count of compressor cycles occurs and other sensed conditions indicate that defrost should be initiated. The sensed conditions include a sensed temperature of a condenser coil in the heat exchange system having dropped below a threshold temperature computed as a function of the number of compressor cycles that have occurred since the last defrost of the evaporator coil.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: July 27, 1999
    Assignee: Carrier Corporation
    Inventors: Zhichao Guo, Robert P. Dolan
  • Patent number: 5899079
    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.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: May 4, 1999
    Assignee: Gross-Given Manufacturing Company
    Inventors: David C. Dunnigan, Bart W. Baxter, Joseph A. Lotspeich
  • Patent number: 5899078
    Abstract: A system is provided for reducing power consumption of door and frame heaters of refrigerating devices while maintaining protection against condensation. One or more condensation sensors are attached to the door and are monitored by control circuitry which controls power applied to the door or frame heater. Condensation on the sensor will increase the conductivity of the sensor, which is detected by the control circuitry. When condensation occurs, power is applied to the heater until the condensation is eliminated. The invention includes two different condensation sensor configurations.
    Type: Grant
    Filed: March 25, 1997
    Date of Patent: May 4, 1999
    Assignee: Peak Energy Systems, Inc.
    Inventor: A. Malcolm Mager
  • Patent number: 5816054
    Abstract: A defrosting apparatus for a refrigerator and a method for controlling the defrosting apparatus, wherein the refrigerating compartment is cooled irrespective of the internal temperature of the freezing compartment when the internal temperature of the refrigerating compartment is higher than a predetermined temperature, so that the refrigerating compartment is maintained below the predetermined temperature. The defrosting operation is carried out in accordance with the drive times of the compressor and refrigerating compartment fan when the internal temperature of the refrigerating compartment is higher than the predetermined temperature even though the compressor and refrigerating compartment fan are continuously driven. Accordingly, it is possible to improve the cooling efficiency.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: October 6, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Han-Ju Yoo, Jae-Seung Lee, Kuk-Jeong Seo, Gi-Hyeong Lee, Hae-Jin Park, Jong-Ki Kim
  • Patent number: 5806321
    Abstract: A method for defrosting a refrigeration system makes provision for partial defrosting of the cooling surface to be carried out at relatively short intervals, and for full defrosting to be carried out at longer intervals. To that end an associated control unit has four timers which determine the switching on and switching off times of the defrosting processes. In this manner the interval between successive full defrostings can be considerably increased.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: September 15, 1998
    Assignee: Danfoss A/S
    Inventors: Christian Bendtsen, Frede Schmidt
  • Patent number: 5797273
    Abstract: A defrost control for a heat pump system initiates a defrost of the outdoor coil when certain computed condition occur. The conditions include exceeding a limit as to the difference that may be permitted between the maximum indoor coil temperature occurring since the last defrosting of the outdoor coil and the current indoor coil temperature. The limit that may not be exceeded is computed as a function of the maximum indoor coil temperature occurring since the last defrosting of the outdoor coil.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: August 25, 1998
    Assignee: Carrier Corporation
    Inventors: Zhichao Guo, Robert P. Dolan
  • Patent number: 5794453
    Abstract: An improved method and apparatus is disclosed for removing condensable material from a gas. The gas is caused to flow in series through a chiller for cooling the gas and condensing the condensable material from the gas, then through a separator to separate the condensate from the gas, and then passing the gas through a reheater to reheat the gas. A predetermined charge of refrigerant is passed in a closed cycle through the chiller to cool the gas by absorbing the heat from the gas and evaporating, then the gaseous refrigerant is compressed by a compression unit having an electric drive means in which an amount of energy is added to the gaseous refrigerant. The hot, pressurized, gaseous refrigerant is then passed through an auxiliary condenser sized to remove the energy that was added to the refrigerant by the compression unit at no load conditions, then the refrigerant is passed through the reheater to further condense the refrigerant and to transfer heat to the exiting gas.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: August 18, 1998
    Assignee: Flair Corporation
    Inventor: James W. Barnwell
  • Patent number: 5778147
    Abstract: A dew preventing mechanism prevents the formation of dew on the grilles of an air discharge port of a room air conditioner by activating a heater which heats the grilles in response to the sensing of certain dew-forming conditions. The air conditioner includes thermistors for sensing the temperatures of incoming room air and outgoing cooled air, respectively, and a hygrometer for sensing the humidity of incoming room air. Signals proportional to those temperatures and humidity are sent to a control device which calculates the dew point of the incoming room air and compares the humidity of the incoming air with a reference humidity. When the outgoing air temperature is less than the dew point, and/or the incoming air humidity exceeds the reference humidity, the heater is actuated.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: July 7, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Yong-Gu Kim
  • Patent number: 5743098
    Abstract: An air cooling and control system for a refrigerated food merchandiser having an insulated cabinet with a product are having adjacent product zones, plural modular evaporator coil sections of substantially equal heat exchange potential and being of predetermined length and arranged in horizontal, spaced, end-to-end predetermined disposition and separate air moving means associated with each coil section and a corresponding product zone for circulating separate air flows through the coil sections and to the product area for cooling. The system further includes a first refrigerant metering valve for controlling liquid refrigerant flow on the high side of the evaporator sections, and a second refrigerant metering valve for controlling suction pressure and refrigerant vapor flow on the low side of the evaporator sections. An electronic control senses exit air temperatures downstream of the evaporator sections and operates the second metering valve in response thereto.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: April 28, 1998
    Assignee: Hussmann Corporation
    Inventor: John A. Behr
  • Patent number: 5727395
    Abstract: A defrost control for a heat pump system initiates a defrost when certain computed conditions are exceeded. The conditions include a limit as to the difference that may be permitted between the maximum temperature difference of two measured temperatures and the current difference of these measured temperatures. The two measured temperatures are the temperature of the indoor coil of the heat pump and the indoor air temperature of the air being heated by the indoor coil.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: March 17, 1998
    Assignee: Carrier Corporation
    Inventors: Zhichao Guo, Robert P. Dolan, Kevin A. Kimberly, Kevin F. Dudley, Thomas R. Phillips
  • Patent number: 5722245
    Abstract: A microwave heat pump defroster system, utilizing a magnetron tube, or other microwave energy generating device, for the application of heat to the external surfaces of the outside coil of an electric heat pump, while the heat pump is operating in the heating mode for the following purposes, (1) to defrost the outside coil of the heat pump, (2) to inhibit the accumulation of frost on the external surfaces of the outside coil of the heat pump, and (3) to allow heat so applied to the external surfaces of the outside coil of the heat pump to be absorbed into the heat pump system via the outside coil of the heat pump, in a manner that will improve the efficiency of the heat pump.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: March 3, 1998
    Inventor: Henderson Frank Ponder
  • Patent number: 5704221
    Abstract: A refrigerating exchanger (1) for a refrigeration facility such as a cold storage room or a refrigerated display case, including a refrigerant or heat-removing fluid circulating assembly (5) connected to a heat exchanging assembly (6) with a large surface area. The assemblies (5, 6) form an array of several layers (7) and several rows (8) in the form of a plurality of mutually similar parallel members (9) separated by spacers (10) for providing heat insulation and collecting defrosting runoff water. Each member (9) comprises at least one layer (7) as well as a respective inlet (11) and outlet (12) forming part of the circulating assembly (5).
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: January 6, 1998
    Assignee: McInternational
    Inventor: Francois Lego
  • Patent number: 5673565
    Abstract: There are described a defrosting method and apparatus for a freezer-refrigerator using a GA-fuzzy theory.A defrosting method for a freezer-refrigerator using a GA-fuzzy theory of the present invention comprises the step of: inputting reference learning data by experiment and actual data to a microcomputer; calculating each frost-quantity on evaporators for a freezing room and a cold-storage room from the input data; inferring each defrosting period for the freezing room and cold-storage room from each frost-quantity on the evaporators for the freezing room and cold-storage room by using a GA-fuzzy theory so that the defrosting periods can be synchronized with each other; and controlling a defrosting heater depending on each defrosting period.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: October 7, 1997
    Assignee: Samsung Electronics Co. Ltd.
    Inventors: Seong-wook Jeong, Jae-in Kim, Yun-seok Kang
  • Patent number: 5657636
    Abstract: A method and apparatus for eliminating the accumulation of moisture condensation on air conditioning supply grills of concentric diffusers which involves the positioning of heat transfer tape around the perimeter of an air conditioning supply grill, a humidistat positioned within the return air duct of the air conditioning system, and a relay located in the electrical component compartment of the air conditioning system which is connected to the humidistat so that when the humidistat senses high levels of moisture in the return air, the relay will allow current to flow through the heat transfer tape for warming of the air conditioning supply grill and prevention of moisture condensation accumulation thereon. Applications may include, but are not limited to, use in commercial air conditioning systems having concentric diffusers.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: August 19, 1997
    Inventor: William G. Suggs
  • Patent number: 5586441
    Abstract: A sealed, closed end heat pipe efficiently warms the drain for an evaporator so that condensation may flow unobstructed away from the evaporator in the refrigeration circuit. An evaporator end of the heat pipe is exposed to ambient air and a condenser end is located close to the drain inlet adjacent the evaporator. Thus, no external power source is required as fluid within the evaporator end is heated to vapor phase and circulates toward the condenser end, and cooled fluid from the condenser end returns to the evaporator end.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: December 24, 1996
    Assignee: Russell A Division Of Ardco, Inc.
    Inventors: Wilbert J. Wilson, Robert G. O'Neal
  • Patent number: 5542258
    Abstract: A refrigerator includes a freezing compartment and refrigerating compartment. Dew prevention heaters are provided for the respective compartments. The dew prevention heater for the freezing compartment cannot be activated if the freezer temperature is above 0.degree. C., but it can be activated if that temperature is below 0.degree. C. as follows: if the compressor is on, then the heater is always on; and if the compressor is off, then the heater will cycle on and off at a frequency dependent upon the magnitude of the temperature outside of the refrigerator. The activation of the dew prevention heater for the refrigerating compartment is independent of the temperature of the refrigerating compartment. Rather, that heater is "off" if the compressor is "off", and if the compressor is "on", the heater will cycle on and off at a frequency dependent upon the temperature outside of the refrigerator.
    Type: Grant
    Filed: February 9, 1995
    Date of Patent: August 6, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae E. Shim
  • Patent number: 5520006
    Abstract: An automated processing freezer system is described that provides a plurality of cooling units to chill the air within a freezing enclosure, whereby the coils of each cooling unit may be defrosted independently, without louvers or other moving mechanisms, while the cooling output of the freezer system is maintained 24 hours a day. Baffles in the freezing enclosure isolate each cooling unit from the airflow associated with the other cooling units, thereby eliminating the need for expensive and less efficient louvers surrounding the coils of each cooling unit.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: May 28, 1996
    Assignee: Northfield Freezing Systems, Inc.
    Inventor: Richard T. Middleton
  • Patent number: 5515689
    Abstract: Methods and apparatus for defrosting the outdoor coil in a variable speed heat pump system including determining, after the end of the last preceding defrosting, the optimal time to begin the next defrosting, and then initiating the defrosting responsive to the time interval since the end of the last defrosting tsD, the averages, over time, of liquid line temperature LLT, speed ES of the engine that drives the compressor, and outdoor dry bulb temperature ODT. The defrosting includes switching the system to the defrost mode at a predetermined maximum engine speed, periodically measuring the time taken during the defrosting ttD and the liquid line temperature LLT; periodically computing the rate of change of LLT with respect to time .DELTA.LLT/.DELTA.t, and when .DELTA.LLT/.DELTA.t is greater than the previous maximum value and ttD is greater than a predetermined time, storing the value of each in place of its preceding value.
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: May 14, 1996
    Assignee: Gas Research Institute
    Inventor: William G. Atterbury
  • Patent number: 5493867
    Abstract: A defrost cycle controller for modifying the total length of time a compressor operates before a defrost cycle is initiated, wherein the time the compressor is on between defrost cycles is referred to herein as a frost accumulation period. A microprocessor includes means for deenergizing the compressor and coupling the defrost heater to a power supply when a continuous compressor run time exceeds a predetermined demand defrost time. The microprocessor further includes means for determining the time required to actually defrost the evaporator during a defrost operation, referred to herein as a defrost time, and means for modifying the frost accumulation period in response to the time to complete the defrost operation.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: February 27, 1996
    Assignee: Whirlpool Corporation
    Inventors: Joseph M. Szynal, Beth A. Maddix, Ronald W. Guess
  • Patent number: 5493870
    Abstract: An air conditioning apparatus includes an air duct having an inlet and an outlet supplying conditioned air, and an air conditioner for cooling and heating air using a refrigeration cycle. In the refrigeration cycle, the air conditioner includes a first heat exchanger, a second heat exchanger disposed on a downstream side of the first heat exchanger, and a compressor. The air conditioner selectively operates in a cooling mode where cool air cooled by the first heat exchanger is supplied through the outlet of the air duct, in a heating mode where hot air heated by the first heat exchanger is supplied through the outlet of the air duct, and in a dehumidifying mode where air cooled by the first heat exchanger and subsequently heated by the second heat exchanger is supplied through the outlet of the air duct.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: February 27, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Satoru Kodama, Yuji Takeo, Eiji Takahashi, Akira Isaji
  • Patent number: 5339643
    Abstract: The disclosure involves a method for defrosting an inner door of a laboratory freezer having (a) a plurality of inner doors, each closing a separate compartment, and (b) an outer door covering the inner doors. The method includes the steps of opening the outer door, removing at least one inner door, closing the outer door and defrosting the removed inner door. In that way, an inner door is defrosted without disturbing the contents of the freezer and, particularly, the contents of the compartment from which the door is removed. Optionally, the freezer user may keep a spare inner compartment door on hand and use it to immediately replace the removed door before closing the outer door. Door defrosting steps and a new hinge mechanism facilitating quick door removal are also disclosed.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: August 23, 1994
    Assignee: Venturedyne Limited
    Inventor: Jeffrey A. Pikaart
  • Patent number: 5315835
    Abstract: A method for controlling a defrosting operation of a refrigerator by providing a defrosting operation control method wherein a refrigerator use pattern by the user is learned. The defrosting operation control method based on the learning of the refrigerator use pattern comprises the steps of dividing a day, namely, 24 hours into a plurality of time intervals each corresponding to a predetermined period, for example, one hour, calculating the number of refrigerator door openings by time intervals, repeating the calculating step for predetermined days, storing information about arithmetic average values of the number of door openings calculated by time intervals, and performing a defrosting operation during the period that the refrigerator is not used by the user, based on the arithmetic average value information.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: May 31, 1994
    Assignee: Goldstar Co., Ltd.
    Inventor: Seong S. Park
  • Patent number: 5291740
    Abstract: Defrosting tool for maintaining the temporarily exposed cold head interface of a cryostat in frost-free condition. A plurality of electrically heated heat exchange surfaces of the tool simultaneously contacts a like plurality of cold head interface surfaces to vaporize frost formed on the latter. The tool further provides a passage for venting the vaporized frost to the surrounding environment.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: March 8, 1994
    Inventor: Steven D. Schnurer
  • Patent number: RE37630
    Abstract: An air cooling and control system for a refrigerated food merchandiser having an insulated cabinet with a product area having adjacent product zones, plural modular evaporator coil sections of substantially equal heat exchange potential and being of predetermined length and arranged in horizontal, spaced, end-to-end predetermined disposition and separate air moving means associated with each coil section and a corresponding product zone for circulating separate air flows through the coil sections and to the product area for cooling. The system further includes a first refrigerant metering valve for controlling liquid refrigerant flow on the high side of the evaporator sections, and a second refrigerant metering valve for controlling suction pressure and refrigerant vapor flow on the low side of the evaporator sections. An electronic control senses exit air temperatures downstream of the evaporator sections and operates the second metering valve in response thereto.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: April 9, 2002
    Assignee: Hussmann Corporation
    Inventor: John A. Behr