EP3086060A1 - Procédé et appareil de dégivrage pour appareil frigorifique ou climatiseur - Google Patents

Procédé et appareil de dégivrage pour appareil frigorifique ou climatiseur Download PDF

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Publication number
EP3086060A1
EP3086060A1 EP16020148.9A EP16020148A EP3086060A1 EP 3086060 A1 EP3086060 A1 EP 3086060A1 EP 16020148 A EP16020148 A EP 16020148A EP 3086060 A1 EP3086060 A1 EP 3086060A1
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EP
European Patent Office
Prior art keywords
defrosting
pressure
preset
value
evaporator
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.)
Granted
Application number
EP16020148.9A
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German (de)
English (en)
Other versions
EP3086060B1 (fr
Inventor
Umberto Merlo
Davide Maddiotto
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.)
LU-VE SpA
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LU-VE SpA
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Priority to RS20200342A priority Critical patent/RS60088B1/sr
Publication of EP3086060A1 publication Critical patent/EP3086060A1/fr
Application granted granted Critical
Publication of EP3086060B1 publication Critical patent/EP3086060B1/fr
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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
    • F25D21/002—Defroster control
    • 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
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F25B2700/11—Sensor to detect if defrost is necessary

Definitions

  • the present invention relates to a defrosting method and device in particular for air refrigerating and air conditioning apparatus.
  • the prior art provides to carry out defrosting methods on different types of evaporators (of an electric, water, hot gas type and so on) for recovering the operating conditions of a clean evaporator.
  • the defrosting operating cycles are performed at constant time intervals, being set by the system operator (for example a defrosting operation every 6 hours) independently of an effective need of performing such a defrosting operation, or after a preset number of evaporator operating hours.
  • the present application is related to solving the above mentioned problems by novel solutions specifically designed for overcoming the above mentioned drawbacks.
  • the aim of the present invention is to provide a defrosting method and device adapted to carry out a defrosting operation always at an optimal defrosting time, while preventing the evaporator from operating in non-optimal operating conditions, that is with non-optimal COPs of the refrigerating/heat pump operating cycle.
  • a main object of the present invention is to provide such a defrosting method and device which may be applied to any type of evaporators, independently of the evaporator performance or power, the refrigerating fluid used and the operating conditions of said evaporator, the number of compressors with which it cooperates, the number of evaporators arranged in a parallel relationship, and so on.
  • Another object of the present invention is to provide a method and device of the above indicated type, allowing a user to change at will a preset value of the defrosting cycle time, based on the user's specific requirements.
  • Another object of the present invention is to provide a method and device of the above indicated type, adapted to detect and signal any operation faults, or non-operating conditions, for example because of damages or malfunctions of one or more components of the apparatus to be defrosted, for example the operating fans.
  • Yet another object of the present invention is to provide such a defrosting method and device designed for properly detecting and signaling a possible lack of operation, for example due to damages or other malfunctions of one or more heating resistances.
  • Yet another object of the present invention is to provide such a defrosting method which may be carried out by a small number of hardware operating means easily commercially available to assure a very safe and reliable operation of the refrigerating apparatus and/or the like.
  • Yet another object of the present invention is to provide such an intelligent defrosting device which requires almost no maintenance.
  • Yet a further object of the present invention is to provide such an intelligent defrosting device which does not require any calibration either by the evaporator maker or by the installing operator or user.
  • a measurement controlling the logic means for selecting the time at which a defrosting operating cycle is started is the pressure difference between the environment to be refrigerated and that measured at a suitable point of the evaporator.
  • That parameter is the pressure existing in the plenum or negative/positive pressure chamber downstream/upstream of a thermal exchange battery, which pressure difference is measured by a suitable differential pressure sensor.
  • the differential pressure value measured by a suitable pressure sensor at a time at which the refrigerating apparatus fans are started again upon an end of a defrosting operating cycle, and an evolution of this signal over the operating time is followed (as ice or frost is formed, the pressure signal will increase because an increased aerodynamic resistance to be compensated for by the air fans).
  • step S1 If a response in the step S1 is NO, than the diagram flow goes to the time operating step S2 (alarm condition).
  • a response in the operating step S1 is YES, then it is determined, in the operating step S3, if the pressure difference is higher than or equal to a threshold pressure difference.
  • step S4 the air fans are put in an OFF or switched off condition, whereas the defrosting resistances are switched to an ON status or energized and the compressor is switched to an OFF condition.
  • step S4 also flows the step S2 related to the time operation (alarm condition).
  • step S4 From the step S4, the flow goes to the step S5, where the defrosting end temperature is measured.
  • step S5 From the step S5 the flow goes, if the response is NO, to the time defrosting step S6.
  • step S5 the flow goes to the step S7, where it is determined if the defrosting end temperature is higher than or equal to the set defrosting end temperature.
  • step S7 If the response is YES, from the step S7 the flow goes to the step S'7, wherein the air fans are in an ON condition, the heating resistances are OFF, the compressor is ON and the defrosting time and also the value ⁇ P fsbrin are stored.
  • step S8 it is determined if the defrosting time is different from the Target or desired defrosting time.
  • the flow goes to the step S9, where is determined the pressure difference variation ⁇ P soglia .
  • step S9 the flow goes to the step S3.
  • step S8 If the response in the step S8 is NO, the flow returns to the pressure difference measuring step S1.
  • the intelligent defrosting device performs, under the control of the inventive method, a series of control operations, followed by alarm signals related to the evaporator operation through the defrosting step, by using the operating logic arrangements disclosed hereinbelow.
  • These logic means provide to perform a series of checking operations, followed by alarm signals, related to the evaporator operating status during the defrosting step.
  • the following operation status of the following components is monitored: a) the air fans; b) the defrosting electric resistances (or other defrosting devices); c) any anomalous formations of ice at the end of the defrosting operation.
  • the safety logic means will be operated in a case in which ⁇ P soglia > fan ⁇ P max , that is as the threshold ⁇ P, which varies in a convergence cycle, exceeds the maximum ⁇ P value which can be achieved by the air fan associated with a given exchange battery.
  • the threshold value is never achieved, and accordingly the defrosting operation could not be actuated.
  • Another case in which the threshold ⁇ P could not be achieved is when an excessively high defrosting Target time value is set.
  • the inventive method will comprise the steps of:
  • Figures 2 and 2A respectively show the two sides of the refrigerating apparatus including the sensor means of the inventive device.
  • FIG. 2B shows the main hardware components of the intelligent defrosting device of the present invention.
  • the arrow A shows the air flow
  • the dashed semicircular line 101 shows a fan-coil assembly
  • the letters T1, T2 and T3 show temperature sensors
  • 102 shows a differential pressure measuring device
  • 103 shows a pressure probe
  • 104 shows a control panel
  • the arrow F1 shows a power supply of the control panel 104
  • the arrow F2 shows the output drive signal
  • the reference T4 shows a further temperature sensor.
  • FIGS 3 to 3B show further hardware components of the intelligent defrosting device according to the present invention.
  • a main hardware component thereof is a screened pressure gauge assembly 105, advantageously using a membrane 106, for example consisting of a commercially available GORE-TEX ® material.
  • the pressure gauge assembly 105 further comprises an anti-turbulence cover 107.
  • FIGS 3A and 3B schematically show defrosting end sensors which has been generally indicated by the reference letters T4, T1, T2, T3.
  • Figure 3B is a left side front view of Figure 3A .
  • Figures 3A and 3B clearly show possible positions of the defrosting end sensors T4, T1, T2, T3, that is on a bend portion of the refrigerating circuit, at a top central position on the manifold side (0) and inside the finned pack at a diagonal position T1, T2, T3.
  • FIGS 3, 3A and 3B also clearly show that the defrosting device 100 of the present invention comprises a small number of hardware components which, besides reducing the cost of the device, allow said device to be nearly free from maintenance.
  • the invention has provided an "intelligent" defrosting method and an “intelligent” defrosting device, which may always perform the defrosting operation at an optimal defrosting time, thereby preventing the evaporator from operating in non-optimal operating conditions, that is with non-optimal performance coefficients of the refrigerating/heat pump cycle.
  • a further advantage of the method and device according to the present invention is that the subject intelligent defrosting device may be applied to any type of evaporators, independently of their power or the refrigerating fluid used and the operating conditions thereof.
  • Yet another advantage of the present invention is that the operator may change at will the defrosting cycle time preset value, based on the operator requirements.
  • inventive method and device have been herein disclosed as used in air refrigerating and/or air conditioning apparatus, they could be obviously also used in other frost or ice forming apparatus, which ice, for an efficient and optimal operation of the apparatus, must be quickly removed, for example apparatus operating based on sucked air or air delivered on the exchange battery, as well as for any types of air fans (either of an axial or centrifugal type, and so on).
EP16020148.9A 2015-04-20 2016-04-20 Procédé et appareil de degivrage pour appareil frigorifique ou climatiseur Active EP3086060B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RS20200342A RS60088B1 (sr) 2015-04-20 2016-04-20 Postupak odmrzavanja i uređaj za hlađenje ili aparat za klimatizaciju

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2015A000564A ITMI20150564A1 (it) 2015-04-20 2015-04-20 Procedimento e dispositivo di sbrinatura, in particolare per apparecchi per la refrigerazione ed il condizionamento dell'aria

Publications (2)

Publication Number Publication Date
EP3086060A1 true EP3086060A1 (fr) 2016-10-26
EP3086060B1 EP3086060B1 (fr) 2020-01-29

Family

ID=53765290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16020148.9A Active EP3086060B1 (fr) 2015-04-20 2016-04-20 Procédé et appareil de degivrage pour appareil frigorifique ou climatiseur

Country Status (6)

Country Link
EP (1) EP3086060B1 (fr)
ES (1) ES2775048T3 (fr)
HU (1) HUE047831T2 (fr)
IT (1) ITMI20150564A1 (fr)
PT (1) PT3086060T (fr)
RS (1) RS60088B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107166741A (zh) * 2017-06-19 2017-09-15 广东美的暖通设备有限公司 热泵机组及其防冻结控制方法
CN107192206A (zh) * 2017-06-29 2017-09-22 青岛海尔股份有限公司 一种冰箱的化霜方法
NO20180682A1 (no) * 2018-05-15 2019-06-11 Romy Clima As Fremgangsmåte for styring av en ventilasjonsvarmepumpe
CN111426109A (zh) * 2020-03-16 2020-07-17 科希曼电器有限公司 基于温度及风压差检测的空气源热泵除霜系统以及方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299237A (en) * 1964-03-02 1967-01-17 Robertshaw Controls Co Defroster control or the like
EP0147825A2 (fr) * 1983-12-27 1985-07-10 Honeywell Inc. Système de régulation de dégivrage pour une pompe à chaleur
EP0881440A2 (fr) * 1997-05-27 1998-12-02 R.C. Condizionatori S.p.A. Commande de dégivrage d'évaporateur pour une unité de pompe à chaleur à air
US6430985B1 (en) * 1999-08-05 2002-08-13 Johnson Controls Technology Company Multiple point calibrated HVAC flow rate controller
US20040104278A1 (en) * 2002-11-22 2004-06-03 Walsh Paul J. System and apparatus for refrigeration and heating
KR100685767B1 (ko) * 2005-11-01 2007-02-22 주식회사 대우일렉트로닉스 폐열회수 환기장치의 제상운전 시스템 및 방법
JP2011247525A (ja) * 2010-05-28 2011-12-08 Panasonic Corp 冷凍装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299237A (en) * 1964-03-02 1967-01-17 Robertshaw Controls Co Defroster control or the like
EP0147825A2 (fr) * 1983-12-27 1985-07-10 Honeywell Inc. Système de régulation de dégivrage pour une pompe à chaleur
EP0881440A2 (fr) * 1997-05-27 1998-12-02 R.C. Condizionatori S.p.A. Commande de dégivrage d'évaporateur pour une unité de pompe à chaleur à air
US6430985B1 (en) * 1999-08-05 2002-08-13 Johnson Controls Technology Company Multiple point calibrated HVAC flow rate controller
US20040104278A1 (en) * 2002-11-22 2004-06-03 Walsh Paul J. System and apparatus for refrigeration and heating
KR100685767B1 (ko) * 2005-11-01 2007-02-22 주식회사 대우일렉트로닉스 폐열회수 환기장치의 제상운전 시스템 및 방법
JP2011247525A (ja) * 2010-05-28 2011-12-08 Panasonic Corp 冷凍装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107166741A (zh) * 2017-06-19 2017-09-15 广东美的暖通设备有限公司 热泵机组及其防冻结控制方法
CN107166741B (zh) * 2017-06-19 2019-10-01 广东美的暖通设备有限公司 热泵机组及其防冻结控制方法
CN107192206A (zh) * 2017-06-29 2017-09-22 青岛海尔股份有限公司 一种冰箱的化霜方法
NO20180682A1 (no) * 2018-05-15 2019-06-11 Romy Clima As Fremgangsmåte for styring av en ventilasjonsvarmepumpe
NO343798B1 (no) * 2018-05-15 2019-06-11 Romy Clima As Fremgangsmåte for styring av en ventilasjonsvarmepumpe
WO2019221606A1 (fr) * 2018-05-15 2019-11-21 Romy Clima As Procédé de commande d'une pompe à chaleur de ventilation
CN111426109A (zh) * 2020-03-16 2020-07-17 科希曼电器有限公司 基于温度及风压差检测的空气源热泵除霜系统以及方法

Also Published As

Publication number Publication date
ES2775048T3 (es) 2020-07-23
RS60088B1 (sr) 2020-05-29
EP3086060B1 (fr) 2020-01-29
ITMI20150564A1 (it) 2016-10-20
PT3086060T (pt) 2020-04-06
HUE047831T2 (hu) 2020-05-28

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