EP3401624A1 - Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation - Google Patents

Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation Download PDF

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Publication number
EP3401624A1
EP3401624A1 EP17170851.4A EP17170851A EP3401624A1 EP 3401624 A1 EP3401624 A1 EP 3401624A1 EP 17170851 A EP17170851 A EP 17170851A EP 3401624 A1 EP3401624 A1 EP 3401624A1
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EP
European Patent Office
Prior art keywords
air conditioning
functional
conductor element
electric energy
conditioning unit
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.)
Pending
Application number
EP17170851.4A
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German (de)
English (en)
Inventor
Hüseyin Cem KIZILARI
Mustafa KARATAS
Rasit GÖKALAN
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.)
Vestel Elektronik Sanayi ve Ticaret AS
Original Assignee
Vestel Elektronik Sanayi ve Ticaret AS
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.)
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Publication date
Application filed by Vestel Elektronik Sanayi ve Ticaret AS filed Critical Vestel Elektronik Sanayi ve Ticaret AS
Priority to EP17170851.4A priority Critical patent/EP3401624A1/fr
Priority to TR2017/07618A priority patent/TR201707618A2/tr
Publication of EP3401624A1 publication Critical patent/EP3401624A1/fr
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02Detecting the presence of frost or condensate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00Details or features not otherwise provided for
    • F24F2221/54Heating and cooling, simultaneously or alternatively

Definitions

  • the present invention refers according to claim 1 to an air conditioning unit and according to claim 14 to a method for operating an air conditioning unit.
  • defrost is a big problem for the heating mode when air conditioner tries heating, in heating mode, heat transferred to the outside and the heat of outdoor unit of air conditioner will be dramatically decreased and goes to freeze in anytime otherwise condenser will be freezed then the heat cannot be transferred, performance and indoor unit pressure for heating will be decreased. So sensing building up of ice or snow is very important and needed.
  • NTCs temperature sensors
  • Document US4305259A discloses a frost sensor circuit which employs a thermistor to sense the amount of frost present on the cooling coils of a refrigerator, air conditioner, or the like, and to inhibit defrosting that would otherwise occur at regular intervals, in those cases where the frost present is not enough to justify a defrost function thereby to limit defrost heating to those cycles requiring it, thus saving electrical energy. This is done by mounting the thermistor at or on the coils to collect the same amount of frost as the coils and to have the defrost cycle control energize the same for a timed interval, melting the frost thereon and thereby determining the amount of frost build-up.
  • Document US3465535A discloses a frost detector for detecting the accumulation of frost on a surface of an evaporator during cooling operation of said evaporator comprising: sending means for converting electrical energy to vibratory energy; receiving means for converting vibratory energy to electrical energy; a metal wire connecting said sending and receiving means for conducting vibrations from said sending means to said receiving means; said wire being positioned adjacent said evaporator surface so that the build-up of frost on said surface reduces the vibratory energy at said receiver means to thereby cause a reduction in the electrical energy output thereof and means responsive to said reduction in electrical output energy for initiating a defrosting of said evaporator.
  • the air conditioning unit is preferably for buildings respectively a stationary air conditioning unit.
  • the inventive cooling unit in particularly air conditioning unit, preferably comprises at least an air conditioning means for heating and/or cooling of air, wherein the air conditioning means comprises a functional fluid and functional means, in particular a condenser means for condensing said functional fluid or an evaporator for evaporating said functional fluid or a heat-exchanger for transferring thermal energy from the functional liquid to the surrounding or vice versa, a frost detection means for detecting ice or snow inside or at the outside of the functional means, wherein the frost detection means comprises at least one conductor element for conducting electric energy from a source to an electric energy conducting part of the functional means, wherein the conductor element is arranged spaced apart and in close vicinity, in particularly less distance than 10mm, to the electric energy conducting part of the functional means, wherein the conductor element and the electric energy conducting part become short-circuited due to growth of
  • the conductor element has a rod-like shape and is arranged in parallel to the electric energy conducting part of the functional means.
  • This embodiment is beneficial since a conductive rod can be provided in a reliable and cheap manner.
  • the distance between the conductor element and functional means can be set up in a very precise manner. Building up of ice or snow in a gap between the conductor element and the functional means causes setting up of an electric connection between the functional means and an electric source, thus current flowing in said connection can be measured.
  • the conductor element has according to a further preferred embodiment of the present invention a ring-like shape and is arranged around an electric energy conducting rod-like or electric energy conducting pipe-like member of the functional means.
  • This embodiment is also beneficial since a ring member surrounds the pipe-like or rod-like element of the functional means, thus ice or snow growth can be detected along the circumferential surface of said element.
  • This embodiment is further beneficial since the size of the connection caused by grown ice or snow and therefore current flow can be analyzed in a predefined dependency.
  • the conductor element has according to a further preferred embodiment of the present invention a preferably straight rod-like shape and is arranged in an aligned manner to the electric energy conducting part of the functional means, wherein the distance between one end of the conductor element and the electric energy conducting part of the functional means and the distance between another end of the conductor element and the electric energy conducting part of the functional means differ from each other.
  • This embodiment is beneficial since the size of the connection caused by grown ice or snow and therefore current flow can be analyzed in a predefined dependency.
  • the conductor element has according to a further embodiment of the present invention a ring-like shape and is arranged in a none-coaxial manner around an electric energy conducting rod-like or electric energy conducting pipe-like member of the functional means.
  • This embodiment is beneficial since the size of the connection caused by grown ice or snow and therefore current flow can be analyzed in a predefined dependency.
  • the conductor element has a heterogenous structure, wherein the thickness, material composition and/or shape varies along a longitudinal axis or a circumferential direction.
  • This embodiment is beneficial since due to one, two, three or multiple of these features the growth and/or shape and/or position and/or size of the ice or snow connection can be affected.
  • Current flow can be analyzed in a predefined dependency of one, two, three or multiple of said features.
  • a conductive rod, ring or any conductive material is preferably located at the bottom (efficient place of the condenser) of the outdoor unit condenser and is preferably arranged my means of plastic holders holding the conductor element in an optimum distance to condenser and nearly but no contact. While starting icing, conductive rod is short-circuited with condenser through icing and it initiates defrosting algorithm by sensing current flow from source to ground by current sense circuit.
  • signals or data provided by a measurement and/or detecting unit can preferably be analyzed with respect to the individual conducting elements. It is further conceivable that signals or data representing current flow of multiple or all of the conducting elements or the entirety of the conducting elements is analyzed in a predefined manner.
  • Signals or data provided by the measurement and/or detecting unit are according to a further preferred embodiment of the present invention processed by means of a predefined algorithm, wherein triggering of defrosting is caused in dependency of the processed signals or data.
  • Signals or data provided by the measurement and/or detecting unit are preferably processed in dependency of the position and/or features of the respective conductor element.
  • Features can be, e.g. size, shape, material, distance to functional means, etc.
  • the air conditioning unit comprises according to the present invention at least one heating means, in particularly an electric heating means, for defrosting of one or multiple functional means.
  • the heating means is preferably operated in multiple steps or in a step less manner.
  • the conducting means is according to a further preferred embodiment of the present invention positioned by means of at least one electrically isolated holding member, wherein the isolated holding member has an electrical conductivity of less than 10 -5 S/m (siemens per meter), in particular of less than 10 -6 S/m or of less than 10 -7 S/m or of less than 10 -8 S/m.
  • the electric conductivity of the holding member is preferably lower than the electric conductivity of ice or snow.
  • the minimal distance between the conductor element and the electric energy conducting part of the functional means is according to a further preferred embodiment of the present invention below 5mm, in particular below 3mm or below 2mm or below 1 mm, in particular between 0,001 mm and 10mm or between 0,1 mm and 5mm or between 0,5mm and 3mm.
  • the before mentioned object is also solved by a method for operating a stationary air conditioning unit according to claim 14.
  • the before mentioned method preferably comprises at least the steps: Providing an air conditioning means for heating and cooling of air, wherein the air conditioning means comprises a functional fluid and functional means, in particular a condenser means for condensing said functional fluid or an evaporator for evaporating said functional fluid or a heat-exchanger for transferring thermal energy from the functional liquid to the surrounding or vice versa, providing a frost detection means for detecting ice or snow inside or at the outside of the functional means, wherein the frost detection means comprises at least one conductor element for conducting electric energy from a source to an electric energy conducting part of the functional means, wherein the conductor element is arranged spaced apart and in close vicinity, in particularly less distance than 10mm, to the electric energy conducting part of the functional means, operating the air conditioning means to provide heated air for heating a predefined zone, wherein the conductor element and the electric energy conducting part become short-circuited due to growth of
  • the present invention provides a method of sensing ice and snow by using any conductive material.
  • the defrost operation causes a reduction of the operation level of the functional means. This embodiment is beneficial since no further heating means are required.
  • Air conditioners are the main usage of this invention. Moreover, the invention can preferably be used by any other defrost application area.
  • Fig. 1 a shows an outer part 20 of an air conditioning unit 1.
  • At least one conductor element 41 is arranged in close vicinity to the outer part 20. In case growth of ice or snow starts the ice or snow forms a connection between the outer part 20 and conductor element 41. Thus, current can flow through conductor element 41 to outer part 20 and outer part 20 is preferably connected to ground.
  • Current is provided by a source 70. Between the source 70 and conductor element 41 preferably at least one current limiter 40 and one current measurment and/or detecting unit 60 is provided. The current measurement and/or detecting unit is preferably arranged closer to the source 70 than the current limiter 40.
  • Fig. 1 b shows a similar structure than fig. 1 a.
  • the conductor element 41 is shaped like a ring and positioned around a pipe or piston or rod-like element 71.
  • One or multiple electrically isolated holder means 72 is/are holding the conductor element 41 in a distance to the pipe or piston or rod-like element 71.
  • the ring 41 is electrically connected via connection 44 with a source 70, wherein a current limiter 40 and/or a current measurement and detection unit 60 is preferably arranged between the source 70 and ring 41.
  • a current limiter 40 and/or a current measurement and detection unit 60 is preferably arranged between the source 70 and ring 41.
  • the main concept of this invention is to sense frost anywhere in particularly on functional means (condenser, exchanger, evaporator coil etc.) so, the conductor element/s, in particular conductive rod or ring, is/are used to sense a defrost sequence.
  • frost growth starts on condenser the conductive element respectively rod or ring is very close to this material, so it is short circuited by icing and current is sensed by a circuit that can sense the current flowing from source to ground. So, a signal or data is outputted that represents the information that frost is present on at least one functional means, in particular on condenser or evaporator etc.
  • Fig. 2a shows schematically a cross-sectional view of a part of an air conditioning unit 1.
  • a rod-like or ring-like conductor element 41 is arranged in a condenser 8, wherein an electrically isolated holding means 54 positions the conducting means 41 in a defined distance 49 to the condenser 8.
  • Fig. 2b shows exemplarily that multiple conductor elements 41, 42, 43 can be provided.
  • Preferably are all conductor elements or multiple conductor elements or the majority of the conductor elements connected to the same source and/or current measurement and detecting unit.
  • each conductor element is connected via an individual connection to an individual source, current limiter and current measurement and/or detecting unit.
  • multiple conductor elements of the same type are provided.
  • One type maybe as described with respect to fig. 1 a
  • another type is described with respect to fig. 1 b.
  • each type might be arranged with a heterogenous distance profile with respect to the functional means of the air conditioning unit 1.
  • a further type of conductors comprises multiple materials forming different parts of the surface of the respective conductor element, preferably having different electrical conductivity and/or surface roughness and/or wetting properties and/or surface shape.
  • the present invention refers to an air conditioning unit 1, in particularly for buildings.
  • the inventive air conditioning unit preferably comprises at least an air conditioning means for heating and/or cooling of air, wherein the air conditioning means comprises a functional fluid and functional means 8, 10, in particular a condenser means 8 for condensing said functional fluid or an evaporator 10 for evaporating said functional fluid or a heat-exchanger for transferring thermal energy from the functional liquid to the surrounding or vice versa, a frost detection means 2 for detecting ice or snow inside or at the outside of the functional means, wherein the frost detection means 2 comprises at least one conductor element 41 for conducting electric energy from a source 70 to an electric energy conducting part 71 of the functional means 8, 10, wherein the conductor element 41 is arranged spaced apart and in close vicinity, in particularly less distance than 10 mm, to the electric energy conducting part 71 of the functional means 8, 10, wherein the conductor element 41 and the electric energy conducting part 71 become short-circuited due to growth of ice or snow, and a current measurement
EP17170851.4A 2017-05-12 2017-05-12 Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation Pending EP3401624A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17170851.4A EP3401624A1 (fr) 2017-05-12 2017-05-12 Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation
TR2017/07618A TR201707618A2 (tr) 2017-05-12 2017-05-25 Akim bazli buz ve kar tespi̇ti̇ne sahi̇p i̇kli̇mlendi̇rme üni̇tesi̇ ve böyle bi̇r i̇kli̇mlendi̇rme üni̇tesi̇ni̇ çaliştirmak i̇çi̇n yöntem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17170851.4A EP3401624A1 (fr) 2017-05-12 2017-05-12 Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation

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EP3401624A1 true EP3401624A1 (fr) 2018-11-14

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EP17170851.4A Pending EP3401624A1 (fr) 2017-05-12 2017-05-12 Unité de climatisation ayant une fonction de détection de neige et de glace à base de courant et procédé de fonctionnement d'une telle unité de climatisation

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EP (1) EP3401624A1 (fr)
TR (1) TR201707618A2 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465535A (en) 1968-05-01 1969-09-09 Gen Electric Frost detector for refrigerant evaporators
JPS5045748U (fr) * 1973-08-22 1975-05-08
JPS5226646A (en) * 1975-08-26 1977-02-28 Hoshizaki Electric Co Ltd Automatic defrost controlling system of ereezing device etc
DE2641600A1 (de) * 1976-09-16 1978-03-23 Stiebel Eltron Gmbh & Co Kg Ausloeseeinrichtung fuer eine abtauvorrichtung
US4305259A (en) 1980-04-03 1981-12-15 Eaton Corporation Frost sensor employing self-heating thermistor as sensor element
JPS6065581U (ja) * 1983-10-13 1985-05-09 オリオン機械株式会社 気体冷却器の除霜装置
US20070209446A1 (en) * 2006-03-10 2007-09-13 Stewart Bradley C Frozen material detection using electric field sensor
US20100269519A1 (en) * 2007-03-14 2010-10-28 Khosla Ronald R Retrofittable air conditioner to refrigeration conversion unit
KR20160004004A (ko) * 2014-07-02 2016-01-12 (주)뉴로시스 냉장고의 제상제어시스템

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465535A (en) 1968-05-01 1969-09-09 Gen Electric Frost detector for refrigerant evaporators
JPS5045748U (fr) * 1973-08-22 1975-05-08
JPS5226646A (en) * 1975-08-26 1977-02-28 Hoshizaki Electric Co Ltd Automatic defrost controlling system of ereezing device etc
DE2641600A1 (de) * 1976-09-16 1978-03-23 Stiebel Eltron Gmbh & Co Kg Ausloeseeinrichtung fuer eine abtauvorrichtung
US4305259A (en) 1980-04-03 1981-12-15 Eaton Corporation Frost sensor employing self-heating thermistor as sensor element
JPS6065581U (ja) * 1983-10-13 1985-05-09 オリオン機械株式会社 気体冷却器の除霜装置
US20070209446A1 (en) * 2006-03-10 2007-09-13 Stewart Bradley C Frozen material detection using electric field sensor
US20100269519A1 (en) * 2007-03-14 2010-10-28 Khosla Ronald R Retrofittable air conditioner to refrigeration conversion unit
KR20160004004A (ko) * 2014-07-02 2016-01-12 (주)뉴로시스 냉장고의 제상제어시스템

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