EP1726895A1 - Frostschutzvorrichtung für Kältegerät - Google Patents

Frostschutzvorrichtung für Kältegerät Download PDF

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Publication number
EP1726895A1
EP1726895A1 EP05425467A EP05425467A EP1726895A1 EP 1726895 A1 EP1726895 A1 EP 1726895A1 EP 05425467 A EP05425467 A EP 05425467A EP 05425467 A EP05425467 A EP 05425467A EP 1726895 A1 EP1726895 A1 EP 1726895A1
Authority
EP
European Patent Office
Prior art keywords
protection device
heaters
ice
electric
freeze protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05425467A
Other languages
English (en)
French (fr)
Inventor
Giuseppe Floris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1726895A1 publication Critical patent/EP1726895A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/02—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/008—Defroster control by timer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/141—Removal by evaporation
    • F25D2321/1413—Removal by evaporation using heat from electric elements or using an electric field for enhancing removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays

Definitions

  • the present patent concerns the chillers of conditioners, refrigerated display units and industrial cooling systems and in particular it concerns a device for control, prevention and removal of any ice that may have formed on the ducts and on the finned packs of the chillers.
  • cooling systems use a gas or mixture of gas or a previously cooled non-freezable liquid which is circulated in a closed cooling circuit in which said gas is compressed and expanded.
  • the temperature of an environment for example the external environment
  • the temperature of another environment for example the environment to be cooled
  • the set of compression or expansion ducts and plates is commonly called finned pack.
  • the condensation water freezes on the plates and on the ducts of the finned cooling pack (evaporator).
  • the drip pans When the temperature drops below zero, the drip pans have to be heated so that the condensed water flows out normally without re-freezing in the drip pans themselves or in the drain channels.
  • Said ice produces various highly negative effects on the efficiency of the chiller.
  • a first negative effect is due to the lower thermal conduction of the layer of ice.
  • the heat of the air passing through the finned pack is not absorbed, or is absorbed to a lesser extent, by the gas circulating in the ducts of the finned pack and consequently there is less cooling of the air passing through the finned pack.
  • the chiller consequently increases its speed to reach the set cooling temperature. In this way the cooling unit compressor is overloaded and subject to extra work without a consequent significant improvement in result.
  • a second negative effect consists in reduction of the gap in the finned pack.
  • the ice that forms on the plates and on the ducts increases the overall dimensions of the plates and ducts and consequently the space for passage of the air, or the gap, decreases, reducing the cooling flow rate and capacity with the result that the air circulation fan is overloaded.
  • the aim of the new device is to detect and eliminate ice from the areas where it is most likely to form.
  • a further aim of the new device is to eliminate ice before its formation significantly reduces the efficiency of the chiller.
  • the new anti-freeze protection device for chillers comprising an electric/electronic control circuit, ice sensors and local heaters.
  • the sensors and heaters are applied and positioned, spaced from each other if necessary, in the points and areas where formation of ice is most likely and/or where ice causes the greatest reduction in chiller efficiency.
  • Said sensors and said heaters are connected to the electric/electronic control circuit.
  • the sensors signal its presence to the electric/electronic circuit which suspends operation of the chiller, closing the expansion valves located at the evaporator inlet or regulating opening of said valves and consequently the amount of refrigerant in circulation or the expansion temperature, or suspends operation of the chiller compressor only, and if necessary operates the heaters in order to melt the ice into water which is removed using the means known for removal of condensation.
  • the sensors can be provided with a regulator, in order to increase or decrease their sensitivity.
  • Said electric/electronic circuit can be provided with controls and adjusting means in order to allow the setting of various operating functions such as activation-deactivation times, switch-off of the chiller unit and timing of switch-on of the heaters, switch-off of the chiller unit and joint operation of the heaters, activation when ice is detected or timed activation, and others.
  • Anti-freeze protection device for chillers comprising one or more ice sensors, one or more heaters, at least one electric/electronic circuit connected to said sensors and heaters, and in which said sensors and heaters are located at the points where ice is most likely to form. Said electric/electronic circuit activates said heaters when said sensors detect the formation of ice.
  • the figure illustrates an example of embodiment and application of the new device.
  • the ice sensors (1) detect the formation of ice on a finned pack (A) and in the condensate collection tray inside a duct (C) of a cooling system.
  • Electric heaters (2) are positioned on some plates of the finned pack (A) and in the condensate collection tray.
  • Both the sensors (1) and the heaters (2) are connected to the electric/electronic circuit (3).
  • the finned pack inlet duct is provided with regulator valve (4) connected to said electric/electronic circuit (3).
  • Said electric/electronic circuit (3) is provided with at least one display (3.1) to show the parameters detected and the operating parameters, with buttons and knobs (3.2) for adjustment of the operating parameters and a connector (3.3) for the supply.
  • a connector (3.4) can be provided for interfacing to a computer in order to permit detection and optimised remote setting of the electric/electronic circuit.
  • the new device constituted as described above detects the formation of ice at the critical points and/or at the points where formation of ice is most likely.
  • the electric/electronic circuit (3) performs the set actions to melt or remove it.
  • One possible action provides for closure of the refrigerant inlet valves or cocks (4) or suspension of operation of the chiller unit, and therefore interruption of the flow of refrigerant into the ducts of the finned pack (A).
  • the electric fan continues to operate and the air flow melts the ice without significantly increasing the air temperature.
  • a second possible action provides for stoppage of the inlet of refrigerant or of the chiller unit and electric fan and subsequent operation of the heaters (2).
  • the ice is melted into water which is removed like the usual condensate.
  • the heaters (3) are switched off and the chiller unit and electric fan are re-activated.
  • the new device can also be connected to humidity detection probes and to humidifiers and used to keep a constant humidity level in the cooling system air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP05425467A 2005-05-27 2005-06-30 Frostschutzvorrichtung für Kältegerät Withdrawn EP1726895A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPD20050160 ITPD20050160A1 (it) 2005-05-27 2005-05-27 Dispositivo antighiaccio per refrigeratori

Publications (1)

Publication Number Publication Date
EP1726895A1 true EP1726895A1 (de) 2006-11-29

Family

ID=36778986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425467A Withdrawn EP1726895A1 (de) 2005-05-27 2005-06-30 Frostschutzvorrichtung für Kältegerät

Country Status (2)

Country Link
EP (1) EP1726895A1 (de)
IT (1) ITPD20050160A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103512103A (zh) * 2012-06-29 2014-01-15 太仓南极风能源设备有限公司 空调外机感霜装置
EP2578970A3 (de) * 2011-10-04 2018-04-11 LG Electronics Kühlschrank und Steuerungsverfahren dafür
WO2020028078A1 (en) * 2018-07-30 2020-02-06 Carrier Corporation Defrost system and method of defrosting an evaporator section of a temperature control unit

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084388A (en) * 1976-11-08 1978-04-18 Honeywell Inc. Refrigeration control system for optimum demand operation
US4265092A (en) * 1979-12-26 1981-05-05 Tyler Refrigeration Corporation Refrigerated display case using air defrost with supplemental heater
US4979431A (en) * 1988-11-08 1990-12-25 Mitsui O. S. K. Lines, Ltd. Gaseous flow construction of box member for refrigerated transportion and box member for refrigerated transportation using the same
EP0603576A2 (de) * 1992-12-22 1994-06-29 Whirlpool Europe B.V. Vorrichtung zum Herabsetzen des Energieverbrauchs während der Entfrostung eines Kühlschrankes
EP0787961A2 (de) * 1996-01-30 1997-08-06 Whirlpool Europe B.V. Vorrichtung zum Festellen von Eisbildung und zum Entfernen des Eises mittels Erhitzung, insbesondere für Haushaltskühlschrank-Verdampfer
EP0819898A2 (de) * 1996-07-16 1998-01-21 Thermovonics Co., Ltd Temperaturgeregeltes Gerät
US5842355A (en) * 1995-03-22 1998-12-01 Rowe International, Inc. Defrost control system for a refrigerator
US6318095B1 (en) * 2000-10-06 2001-11-20 Carrier Corporation Method and system for demand defrost control on reversible heat pumps
US20010047657A1 (en) * 2000-05-31 2001-12-06 Sung-Ho Cho Refrigerator for kimchi and controlling method therefor
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US20020184900A1 (en) * 2001-06-07 2002-12-12 Wellman Keith E. Control circuit and method for sequentially defrosting a series of refrigerated display cases

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084388A (en) * 1976-11-08 1978-04-18 Honeywell Inc. Refrigeration control system for optimum demand operation
US4265092A (en) * 1979-12-26 1981-05-05 Tyler Refrigeration Corporation Refrigerated display case using air defrost with supplemental heater
US4979431A (en) * 1988-11-08 1990-12-25 Mitsui O. S. K. Lines, Ltd. Gaseous flow construction of box member for refrigerated transportion and box member for refrigerated transportation using the same
EP0603576A2 (de) * 1992-12-22 1994-06-29 Whirlpool Europe B.V. Vorrichtung zum Herabsetzen des Energieverbrauchs während der Entfrostung eines Kühlschrankes
US5842355A (en) * 1995-03-22 1998-12-01 Rowe International, Inc. Defrost control system for a refrigerator
EP0787961A2 (de) * 1996-01-30 1997-08-06 Whirlpool Europe B.V. Vorrichtung zum Festellen von Eisbildung und zum Entfernen des Eises mittels Erhitzung, insbesondere für Haushaltskühlschrank-Verdampfer
EP0819898A2 (de) * 1996-07-16 1998-01-21 Thermovonics Co., Ltd Temperaturgeregeltes Gerät
US20010047657A1 (en) * 2000-05-31 2001-12-06 Sung-Ho Cho Refrigerator for kimchi and controlling method therefor
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US6318095B1 (en) * 2000-10-06 2001-11-20 Carrier Corporation Method and system for demand defrost control on reversible heat pumps
US20020184900A1 (en) * 2001-06-07 2002-12-12 Wellman Keith E. Control circuit and method for sequentially defrosting a series of refrigerated display cases

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2578970A3 (de) * 2011-10-04 2018-04-11 LG Electronics Kühlschrank und Steuerungsverfahren dafür
CN103512103A (zh) * 2012-06-29 2014-01-15 太仓南极风能源设备有限公司 空调外机感霜装置
WO2020028078A1 (en) * 2018-07-30 2020-02-06 Carrier Corporation Defrost system and method of defrosting an evaporator section of a temperature control unit

Also Published As

Publication number Publication date
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