EP0115799A1 - Verfahren und Vorrichtung zur Regelung des Ein- und Ausschaltens des Abtauvorgangs eines Wärmepumpenverdampfers - Google Patents

Verfahren und Vorrichtung zur Regelung des Ein- und Ausschaltens des Abtauvorgangs eines Wärmepumpenverdampfers Download PDF

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Publication number
EP0115799A1
EP0115799A1 EP84100532A EP84100532A EP0115799A1 EP 0115799 A1 EP0115799 A1 EP 0115799A1 EP 84100532 A EP84100532 A EP 84100532A EP 84100532 A EP84100532 A EP 84100532A EP 0115799 A1 EP0115799 A1 EP 0115799A1
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EP
European Patent Office
Prior art keywords
evaporator
temperature
defrosting
normal operation
gaseous fluid
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Withdrawn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
EP84100532A
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English (en)
French (fr)
Inventor
Dominique Rampazzo
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.)
Novelerg SA
Original Assignee
Novelerg SA
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 Novelerg SA filed Critical Novelerg SA
Publication of EP0115799A1 publication Critical patent/EP0115799A1/de
Withdrawn legal-status Critical Current

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    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle

Definitions

  • the object of the present invention is to remedy these difficulties, and to provide a method and a device for regulating defrosting which avoid premature or too late permutations of the periods of operation and defrosting, and ensure satisfactory energy production with a minimum energy consumption.
  • the invention further extends to a device for implementing the method defined above, comprising a temperature probe of the source of the gaseous fluid which may contain humidity, a temperature probe of the fluid evaporator refrigeration, means for controlling the starting or stopping of a gaseous fluid delivery fan on the surface of the evaporator, means for controlling the reversal of the direction of.
  • the microprocessor for controlling the control means according to the indications of the temperature sensors, characterized in that the temperature sensor of the evaporator is placed in contact with the refrigerant on a piping d entry of the latter into the evaporator and in the immediate vicinity of the latter, and in that the microprocessor further comprises a clock recording the durations of normal operation and defrosting, and means for deactivating the control means during minimum normal operating and defrost times.
  • the microprocessor further comprises control means for switching from normal operation to defrosting, and from defrosting to normal operation, independently of the indications of the temperature probes, beyond maximum durations of normal operation and defrosting.
  • the heat pump installation includes a refrigerant compressor 1.
  • This is generally a fluorinated hydrocarbon, such as monochlorodifluoromethane.
  • the discharge of the compressor 1 is connected by the pipe 2 to the reversing valve 3. From the latter, the pipe 4 goes to the heat exchanger 5.
  • This exchanger ensures the heating of water from a heating circuit from the house, arriving in 6 and evacuated in 7, by condensation of the refrigerating fluid. From the exchanger 5, a duct 8 and the node 8A lead to the expansion valve 9, followed by the node 10.
  • the non-return valve 25 forces the ⁇ refrigerant to pass through the valve 9 in the normal direction of circulation and allows it to pass through the conduit 24 to reverse the direction of flow of the refrigerant, as will be explained below.
  • a fan 17 driven by an electric motor 18 makes it possible to circulate the air ambient in contact with evaporator elements.
  • conduits 19, 20, 21 converge towards a conduit 22 leading to the reversing valve 3, connected by the conduit 23 to the suction of the compressor.
  • a conduit 24, disposed between the nodes 8A and 10, makes it possible to circulate the refrigerating fluid when its direction of circulation is reversed from the evaporator to the condenser passing through the capillary 33 where it is expanded.
  • the permutations between normal operation and defrost cycles are checked using the temperature probes 26 and 27.
  • the probe 26 is intended to record the temperature of the ambient air. It must be placed in the vicinity of the exchanger between the refrigerant and the ambient air, but sufficiently distant from it so that its indication is not disturbed. It must also be sheltered from climatic influences, and therefore in the shade and sheltered from the wind.
  • the probe 27 is arranged on the duct 13, at the inlet of one of the evaporator elements. It is important that it is at the end of the pipe 13 close to the corresponding evaporation element 16, because the expansion of the refrigerant in the valve 9, and consequently its cooling, in fact continue in the pipes 11 , 12, 13 until entering the evaporator elements.
  • the probes 26 and 27 are connected by the links 26A and 27A, shown in dotted lines, to the microprocessor 28, which is provided with a clock 29. This controls the operation of the reversing valve sion 3 by the link 30, and that of the fan motor 18 by the link 31. These links 30, 31 are shown in lines and dots.
  • the flow of refrigerant is that shown by the arrows in solid lines.
  • the compressor 1 compresses and discharges the gaseous refrigerant through the pipe 2 and the valve 3 towards the pipe 4 and the exchanger 5.
  • the refrigerant circulates against the current of the water of the heating circuit of the 'house, arriving via line 6 and evacuated heated at 7.
  • the refrigerant condenses in the exchanger 5. It passes through line 8 and in the expansion valve 9, and it comes out relaxed. It is then divided between the three conduits 11, 12 and 13, before entering the evaporator elements 14, 15 and 16. It vaporizes there in exchange for heat with the ambient air discharged in contact with the pipes and their fins by. the fan 17 driven by the electric motor 18.
  • the vaporized refrigerant is evacuated through the conduits 19, 20 and 21, which meet in the conduit 22 back to the valve 3, then to the compressor via the conduit 23.
  • the sensors 26 for detecting the ambient temperature, and 27 for detecting the temperature of the piping at the inlet to the evaporator element 16, which can be assumed to be equal to that at the inlet. of the other two elements 14, 15, transmit their indications to the microprocessor 28.
  • the latter subtracts the temperature at the inlet of the evaporator from the ambient temperature, and averages this difference and the temperature at the inlet of the evaporator over time intervals of 2 to 6 minutes, so as to avoid premature switching due to instantaneous oscillations of the cycle operation.
  • the microprocessor memorizes the temperature difference as a reference difference each time the temperature of the evaporator falls below this value of threshold, and only after a minimum operating time since the last defrost, for example 20 minutes.
  • the microprocessor only controls switching to defrosting if the temperature difference exceeds the reference difference by a threshold of a few degrees, for example 1 ° to 2 ° C.
  • the microprocessor is furthermore provided with the command not to authorize the switching on the defrost, even if the indications of the In this sense, the probes are only available after a minimum period of normal operation since the last defrost, for example 30 minutes.
  • the microprocessor controls the transition to the phase of defrost. For this purpose, it controls by the link 30 the inversion of the connections of the valve 3, and by the link 31 the stopping of the fan 17.
  • the microprocessor is also provided with a switching setpoint for defrosting if the evaporator temperature has remained below the threshold between 0 and -2 ° C and independently of the other indications of the probes, after a maximum duration, for example 3 to 5 hours.
  • the refrigerant pumped by the compressor 1 follows the path represented by the arrows in broken lines. It passes through valve 3 in line 22, then goes through lines 19, 20 and 21 into the evaporator elements 14, 15 and 16 in which it condenses, ensuring the melting of the frost formed on the pipes and the fins. It then passes through the conduit 24 in the non-return valve 25 and in the capillary 33 where it relaxes, then in the exchanger 5, where it vaporizes by heat exchange with the circulation of water from the heating circuit, then returns via line 4, valve 3 and line 23 to the suction of compressor 1.
  • the microprocessor 28 records only the temperature of the probe 27, that is to say that of the refrigerating fluid. vaporized, this measurement being made in instantaneous value. It compares this temperature with a set value, for example 10 ° C, above which it commands the return to normal operation.
  • the microprocessor is provided with a setpoint authorizing switching to normal operation only after a minimum duration, of the order of 1 to 3 minutes. It also includes an instruction to stop defrosting after a maximum duration of around 15 minutes, even if the indication from the temperature probe did not require it, in order to avoid damage to the heat pump.
  • the expansion valve can be replaced by a capillary and vice versa.
  • the evaporator elements may be of a different type from that of tubes and fins. It is optionally possible to have a heat exchanger between the liquefied refrigerant leaving the exchanger with the heating water and the vaporized refrigerant returning from the evaporator, so as to improve the thermodynamic efficiency of the heat pump.
EP84100532A 1983-01-24 1984-01-19 Verfahren und Vorrichtung zur Regelung des Ein- und Ausschaltens des Abtauvorgangs eines Wärmepumpenverdampfers Withdrawn EP0115799A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8301001A FR2539859A1 (fr) 1983-01-24 1983-01-24 Procede et dispositif de regulation de la mise en degivrage et de l'arret du degivrage d'un evaporateur de fluide frigorifique pour pompe a chaleur
FR8301001 1983-01-24

Publications (1)

Publication Number Publication Date
EP0115799A1 true EP0115799A1 (de) 1984-08-15

Family

ID=9285211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100532A Withdrawn EP0115799A1 (de) 1983-01-24 1984-01-19 Verfahren und Vorrichtung zur Regelung des Ein- und Ausschaltens des Abtauvorgangs eines Wärmepumpenverdampfers

Country Status (2)

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EP (1) EP0115799A1 (de)
FR (1) FR2539859A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164948A2 (de) * 1984-06-12 1985-12-18 York International Corporation Steuervorrichtung und Verfahren zum Abtauen der Aussenrohrschlange einer Wärmepumpe
EP0881440A3 (de) * 1997-05-27 1999-10-06 R.C. Condizionatori S.p.A. Verdampferabtausteuerung für ein Luftwärmepumpenaggregat
WO2019243106A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator
US11365919B2 (en) 2018-07-06 2022-06-21 Danfoss A/S Apparatus for removing non-condensable gases from a refrigerant
US11549734B2 (en) 2018-06-22 2023-01-10 Danfoss A/S Method for terminating defrosting of an evaporator by use of air temperature measurements

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1207904A (fr) * 1957-07-24 1960-02-19 Ranco Inc Perfectionnements apportés aux dispositifs de commande pour des installations de réfrigération
US3280579A (en) * 1964-09-10 1966-10-25 Daryl F Kayl Heat pump defrost control unit
US4178767A (en) * 1978-06-19 1979-12-18 Dunham-Bush, Inc. Reverse fan heat pump defrost control system
FR2486217A1 (fr) * 1980-07-04 1982-01-08 Anectron Dispositif de commande d'un cycle de degivrage d'une pompe a chaleur
US4338790A (en) * 1980-02-21 1982-07-13 The Trane Company Control and method for defrosting a heat pump outdoor heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1207904A (fr) * 1957-07-24 1960-02-19 Ranco Inc Perfectionnements apportés aux dispositifs de commande pour des installations de réfrigération
US3280579A (en) * 1964-09-10 1966-10-25 Daryl F Kayl Heat pump defrost control unit
US4178767A (en) * 1978-06-19 1979-12-18 Dunham-Bush, Inc. Reverse fan heat pump defrost control system
US4338790A (en) * 1980-02-21 1982-07-13 The Trane Company Control and method for defrosting a heat pump outdoor heat exchanger
FR2486217A1 (fr) * 1980-07-04 1982-01-08 Anectron Dispositif de commande d'un cycle de degivrage d'une pompe a chaleur

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164948A2 (de) * 1984-06-12 1985-12-18 York International Corporation Steuervorrichtung und Verfahren zum Abtauen der Aussenrohrschlange einer Wärmepumpe
EP0164948A3 (en) * 1984-06-12 1986-08-27 Borg-Warner Corporation Control system and method for defrosting the outdoor coil of a heat pump
EP0881440A3 (de) * 1997-05-27 1999-10-06 R.C. Condizionatori S.p.A. Verdampferabtausteuerung für ein Luftwärmepumpenaggregat
WO2019243106A1 (en) * 2018-06-22 2019-12-26 Danfoss A/S A method for terminating defrosting of an evaporator
EP3587964A1 (de) * 2018-06-22 2020-01-01 Danfoss A/S Verfahren zur beendigung des abtauen eines verdampfers
CN112189120A (zh) * 2018-06-22 2021-01-05 丹佛斯有限公司 终止蒸发器除霜的方法
CN112189120B (zh) * 2018-06-22 2022-03-04 丹佛斯有限公司 终止蒸发器除霜的方法
US11549734B2 (en) 2018-06-22 2023-01-10 Danfoss A/S Method for terminating defrosting of an evaporator by use of air temperature measurements
US11365919B2 (en) 2018-07-06 2022-06-21 Danfoss A/S Apparatus for removing non-condensable gases from a refrigerant

Also Published As

Publication number Publication date
FR2539859A1 (fr) 1984-07-27
FR2539859B1 (de) 1985-03-29

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Inventor name: RAMPAZZO, DOMINIQUE