EP1215454B1 - Procédé de réduction de la consommation d'énergie d'une machine frigorifique et machine frigorifique fonctionnant suivant ce procédé - Google Patents

Procédé de réduction de la consommation d'énergie d'une machine frigorifique et machine frigorifique fonctionnant suivant ce procédé Download PDF

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Publication number
EP1215454B1
EP1215454B1 EP01830751A EP01830751A EP1215454B1 EP 1215454 B1 EP1215454 B1 EP 1215454B1 EP 01830751 A EP01830751 A EP 01830751A EP 01830751 A EP01830751 A EP 01830751A EP 1215454 B1 EP1215454 B1 EP 1215454B1
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EP
European Patent Office
Prior art keywords
turning
motor compressor
rate
time interval
cycle
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Expired - Lifetime
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EP01830751A
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German (de)
English (en)
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EP1215454A3 (fr
EP1215454A2 (fr
Inventor
Antonio Canova
Andrea Bianchi
David Martini
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Magnetek SpA
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Magnetek SpA
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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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/18—Optimization, e.g. high integration of refrigeration components
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation

Definitions

  • the present invention relates to a method and device for reducing energy consumption in compression refrigerating machines.
  • the invention also relates to a refrigerating machine equipped with means for reducing energy consumption.
  • Compression refrigerating machines comprise a circuit for a thermodynamic fluid, which performs a cycle of compression, cooling and possible condensation, expansion, heating, and subsequent compression.
  • the fluid is compressed by a compressor and then cooled and condensed in a heat exchanger, which, either directly or indirectly, yields heat to the environment.
  • the liquid thus cooled is expanded in an expansion valve or in any other suitable means, such as a turbine, for recovery of part of the energy.
  • the expanded fluid at a low temperature, is made to circulate in an exchanger inside the refrigerating machine, where it heats up absorbing heat from the compartment of the refrigerating machine that is to be kept at a low temperature.
  • the fluid thus heated up is then sent back again to the compressor for a new thermal cycle.
  • the compressor is operated by an electric motor and is switched on and off according to the temperature detected by a thermostat set in the refrigerated compartment of the refrigerating machine.
  • the compressor is started up when the temperature inside the refrigerated compartment exceeds a maximum threshold and is turned off again when the temperature drops below a minimum threshold. If the refrigerated compartment remains closed and inside it there is no generation of heat (for example due to processes of fermentation of products stored in the compartment itself), switching-on of the compressor and the consequent extraction of heat from the refrigerated compartment has the sole function of compensating for penetration of heat from the outside to the inside of the refrigerated compartment through the walls and the apertures of the compartment.
  • the switching-on time of the compressor depends upon the heat flow obtained with the refrigerating fluid and is thus a function, among other things, of the running rate (r.p.m.) of the motor that controls the compressor.
  • r.p.m. running rate of the motor that controls the compressor.
  • a higher r.p.m. i.e., a higher number of revs
  • the fluid that carries out thermodynamic conversion in the cooling circuit has to pump out the heat that has entered the refrigerated compartment owing to the opening thereof or the introduction of products, or else the heat that is generated inside the refrigerated compartment on account of the aforesaid fermentation phenomena.
  • the time interval during which the motor that operates the compressor is on depends, in this case, both upon the r.p.m. of the motor and upon the amount of heat that enters the refrigerated compartment or is generated therein.
  • the tendency, in the first place, is to improve thermal insulation, in order to minimize the penetration of heat inside the refrigerated compartment.
  • EP-A-0490089 discloses a refrigerator compressor controlled with a method according to the preamble of claim 1, and according to which two operating frequencies are set.
  • the lower frequency corresponds to the highest overall efficiency of the compressor under normal operating conditions of the refrigeration appliance associated with the compressor, while the other frequency is higher and is used under conditions of a higher refrigerating capacity demand.
  • the purpose of the present invention is to provide a device and method for controlling the motor compressor of the refrigerating machine which will enable further reduction of energy consumption, modifying the modes of operation of the motor compressor.
  • the method of the present invention it is envisaged to measure the duration of at least two successive time intervals of turning-off of the motor compressor, and to operate the motor compressor when it is turned back on after the second turning-off time interval at the optimal rate if the second turning-off time interval has a duration equal to or greater than that of the previous turning-off time interval, or at a higher rate if the second turning-off time interval has a duration lower than that of the previous turning-off time interval.
  • the learning cycle for determining the optimal operating rate of the motor compressor.
  • the characteristics of the motor compressor are verified in order to identify the minimum operating rate below which there is a worsening of the efficiency of the motor compressor.
  • the learning cycle can be used to identify the class to which the refrigerating machine belongs.
  • the invention also relates to a refrigerating machine controlled according to the method illustrated above, as well as a control circuit for a motor compressor programmed according to said method.
  • Fig. 1 is a very schematic illustration of a compression refrigerating machine in its main components.
  • Designated by the reference number 1 is a motor compressor comprising an electric motor 3, supplied by the mains, indicated by the reference number 4, and a compressor 5.
  • the compressor 5 is inserted in a refrigerating circuit comprising a heat exchanger 7 traversed by a coil 9, which forms the condenser and in which the fluid compressed by the compressor 5 is condensed and brought to the liquid state.
  • Designated by the reference number 11 is an expansion valve, where the liquid undergoes expansion before passing through a vaporizer coil 13, in which the fluid is completely vaporized by absorbing heat from the refrigerated compartment 15 of the refrigerating machine.
  • the motor compressor 1 is controlled by means of a programmable microprocessor control unit 17 connected to the supply of the motor 3 and to a temperature sensor or a thermostat 19 set inside the refrigerated compartment 15.
  • the motor compressor 1 is operated cyclically according to the temperature detected by the sensor 19 and to the temperature that it is desired to maintain inside the refrigerated compartment 15.
  • the motor compressor 1 is turned on when the temperature inside the refrigerated compartment 15 exceeds a maximum value T M and is kept turned on until, thanks to the extraction of heat by the refrigerating fluid, the temperature inside the refrigerated compartment 15 reaches a minimum value T m .
  • the power absorbed by the motor compressor 1 during the turning-on cycle varies in time, decreasing from a maximum value to a minimum value.
  • FIG. 2A shows qualitatively the plot of the power absorbed as a function of time between an instant t 0 , in which the temperature T inside the refrigerated compartment 15 reaches the maximum value T M (and hence the motor compressor 1 is turned on), and an instant t a , in which the temperature T inside the refrigerated compartment 15 reaches the minimum value T m (and hence the motor compressor 1 is turned off).
  • the value W M of the maximum power and the value W m of the minimum power absorbed by the motor compressor 1 during the turning-on cycle depend upon the speed of rotation of the motor compressor 1 itself, and hence upon the supply frequency of the motor 3.
  • a higher speed of rotation corresponds to a higher rate of flow of the refrigerating fluid in the circuit, and consequently to a faster extraction of heat from the refrigerated compartment 15.
  • Fig. 2B shows the same graph for a lower speed of rotation of the motor compressor 1.
  • the values of maximum and minimum power absorbed by the motor compressor 1 are lower than those of the case illustrated in Fig. 2A.
  • the instants of turning on and turning off of the motor compressor 1 are denoted by t 0 and t b .
  • the rate of flow of the refrigerating fluid in the circuit is lower, and hence the turning-on time (t b - t 0 ) is higher than that of the example of Fig. 2A.
  • the curve representing the power presents a slope that is less steep than the slope of Figure 2A.
  • the area under the curve representing the absorbed power corresponds to the energy absorbed during the turning-on cycle or period. This area is approximately the same in the two cases, in so far as it corresponds to the same quantity of heat extracted from the refrigerated compartment 15. Consequently, for each turning-on cycle, the energy absorbed by the motor compressor 1 is substantially equal irrespective of the speed of rotation of the compressor, and hence of the supply frequency of the motor 3.
  • the mean energy absorbed by the machine in a period of time that comprises a plurality of turning-on cycles changes according to the speed of rotation of the motor compressor 1.
  • the diagram of Fig. 3A shows, in a time interval (t 1 - t 0 ), three turning-on cycles of the motor compressor 1. Each turning-on cycle has a duration denoted by t on . Between one turning-off of the motor compressor 1 and a subsequent turning-on, there elapses a time interval t off which is constant if it is assumed that the refrigerated compartment 15 is not opened. In fact, according to this hypothesis the duration of turning-off depends exclusively upon the flow of heat through the walls delimiting the refrigerated compartment 15.
  • the graph of Fig.3B shows, for the same time interval (t 1 - t 0 ), the situation in which the motor compressor 1 works at a lower rate.
  • t 1 - t 0 the time interval considered, there fall two entire turning-on cycles corresponding to the cycle of Fig. 2B, whereas a third turning-on cycle starts just before the instant t 1 , this in so far as, whilst the turning-off interval is the same in the two cases, the duration of the turning-on cycle is longer in the second case than in the first case.
  • the refrigerated compartment 15 remains closed.
  • the refrigerated compartment 15 may be opened to enable removal of a product or insertion of a new product to be preserved. If the motor compressor 1 were always controlled at the lowest rate, it would not be possible to obtain cooling or freezing of the new product inserted into the refrigerated compartment 15 nor extraction of the greater amount of heat that enters the refrigerated compartment 15 on account of opening of the access door.
  • the turning-off time (denoted by t off in the diagrams of Figs 3A and 3B) depends upon the characteristics of the refrigerating machine and, more in particular, upon the class to which it belongs, which is indicative of the quality of insulation of its walls. Also this information may not be known a priori.
  • Figs 4A and 4B are schematic representations, in the form of block diagrams, of a learning cycle that the program executed by the programmable control unit 17 can perform, for example, on occasion of the first turning-on of the machine (or whenever this may become necessary) in order to acquire the mechanical and thermodynamic characteristics of the system, and hence set the optimal parameters for operation when running the machine in an energy-saving mode.
  • the control unit 17 can pass to management of the motor compressor 1 by means of a regime cycle, illustrated schematically in the form of a block diagram in Fig.5.
  • the learning cycle illustrated in Figs 4A and 4B envisages a first cooling step and a second learning step.
  • the learning cycle functions as described in what follows.
  • the motor compressor 1 is turned on at a speed of rotation corresponding to the maximum supply frequency of the motor 3. This maximum frequency is denoted by f max .
  • the working frequency of the motor 3, and hence in the final analysis, the speed of rotation of the motor compressor 1, is denoted in the block diagram by f.
  • the motor compressor 1 is kept operating at the maximum working rate until the temperature inside the refrigerated compartment 15 reaches the minimum value T m , at which the motor compressor 1 is turned off.
  • the motor compressor 1 remains off until, on account of the gradual penetration of heat from outside into the refrigerated compartment 15, the temperature T inside the latter again reaches the maximum value T M , at which there is a new turning-on of the motor compressor 1. Also in this step, the motor compressor 1 is sent into rotation at the maximum rate (f max ), at which there is the maximum rate of cooling. This second turning-on represents the start of the learning cycle proper.
  • the learning cycle is an iterative cycle, and the iterations are counted by means of a counter, designated by N.
  • N a counter
  • the control unit 17 must detect the energy absorbed during a turning-on cycle, this being denoted by EC in the diagram and corresponding to the area under the power-absorption curve illustrated in Fig. 2.
  • the control unit 17 must determine the time duration of each turning-off interval between two consecutive operating cycles of the motor compressor 1. This time is denoted by t off .
  • the control unit 17 stores in memory the duration of the turning-off interval that has just concluded. This parameter is denoted in the diagram by (t off ) N-1 . Also the value of the energy absorbed in the previous turning-on cycle of the motor compressor 1 is stored in memory (or has been stored previously). This parameter is denoted by EC N-1 .
  • the control unit 17 calculates the energy absorbed during the cycle (EC N ) by sampling of the absorbed power.
  • the motor compressor 1 When the minimum temperature T m is reached in the refrigerated compartment 15, the motor compressor 1 is turned off, and the control unit 17 starts counting the turning-off time of the compressor.
  • the energy absorbed during the N-th turning-on cycle is stored in memory as the parameter EC N , whereas the duration of the time interval during which the compressor 5 remains stationary after the N-th turning-on cycle is denoted by (t off ) N .
  • Counting of the turning-off time (t off ) N ceases when the temperature T inside the refrigerated compartment 15 reaches again the maximum value T M , at which the motor compressor 1 must be turned on again.
  • the control unit 17 will have available in memory two values corresponding to the durations of the turning-off periods of the compressor, denoted by (t off ) N-1 and (t off ) N . If the duration of the second turning-off period (i.e., the duration (t off ) N ) is equal to or higher than the duration of the preceding turning-off period (t off ) N-1 , this means that the refrigerated compartment 15 has not been opened during the second turning-off period. If, instead, the motor compressor 1 has remained off for a time shorter than the preceding cycle, this means that the refrigerated compartment 15 has been opened at least once.
  • a control is carried out on the energy absorbed in two successive turning-on cycles if and only if the preceding control has ascertained that the refrigerated compartment 15 has not been opened in the course of the last turning-off interval.
  • the second decision block represented in Fig. 4B indicates that the control unit 17 carries out a comparison between the energy absorbed in the last two turning-on cycles, i.e., between the quantities EC N and EC N-1 .
  • the value of the optimal rate of operation is identified as the one used in the first cycle.
  • the control system When the optimal value (f ott ) of the rate is defined, the control system has concluded the learning cycle and passes on to operating according to the regime operating cycle, schematically represented by the block diagram of Fig. 5.
  • the control unit 17 keeps in memory the time duration of two successive turning-off periods, denoted in the diagram of Fig. 5 by (t off ) N-1 and (t off ) N .
  • the motor compressor 1 is turned on whenever the temperature inside the refrigerated compartment 15 reaches the maximum temperature T M and is kept turned on up to the moment at which the temperature in the refrigerated compartment 15 reaches the minimum value T m .
  • the speed of operation of the compressor, and hence the rate of cooling, is determined on the basis of a comparison between the durations of the last two turning-off intervals.
  • the duration of the last turning-off interval (t off ) N is greater than or equal to the duration of the penultimate turning-off interval (t off ) N-1 , this means that the refrigerated compartment 15 has not been opened, and hence that the motor compressor 1 can be made to operate at the minimum rate, i.e., at the optimal rate (f ott ) determined during the learning cycle.
  • the duration of the last turning-off interval (t off ) N is shorter than that of the preceding turning-off interval, this means that the refrigerated compartment 15 has been opened, and hence the system must proceed to a rapid cooling, thus imposing on the motor compressor 1 the need to work, in the new turning-on cycle, at the maximum rate (f max ), which enables rapid restoration of the conditions of minimum temperature T m , with extraction of the excess heat introduced into the refrigerated compartment 15 and deriving, for example, from the mere opening and re-closing of the compartment, or else from the introduction of new products that are to undergo refrigeration.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Feedback Control In General (AREA)
  • Compressor (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Claims (12)

  1. Procédé de régulation d'un moteur compresseur dans une machine frigorifique, comprenant les étapes consistant à déterminer un rythme optimal (fott) de fonctionnement du moteur compresseur, qui minimise la consommation d'énergie de la machine, et à faire fonctionner ledit moteur compresseur pendant chaque cycle d'activation de façon alternative audit rythme optimal (fott) ou à un rythme supérieur (fmax) selon le degré de refroidissement requis, caractérisé par le fait de mesurer la durée d'au moins deux intervalles d'arrêt successifs (toff) du moteur compresseur et de faire fonctionner le moteur compresseur lorsque celui-ci est à nouveau activé après le deuxième intervalle de temps d'arrêt soit au rythme optimal (fott) si le deuxième intervalle de temps d'arrêt présente une durée égale ou supérieure à celle de l'intervalle de temps d'arrêt précédent, soit à un rythme supérieur (fmax) si le deuxième intervalle de temps d'arrêt présente une durée (toff) inférieure à celle (toff) de l'intervalle de temps d'arrêt précédent.
  2. Procédé selon la revendication 1, caractérisé par les opérations consistant à :
    déterminer l'intervalle de temps d'arrêt ((toff)N) entre un arrêt du moteur compresseur et une nouvelle activation ultérieure du moteur compresseur ;
    comparer ledit intervalle de temps avec l'intervalle de temps précédent ((toff)N-1) entre l'arrêt précédent et la réactivation précédente du moteur compresseur ;
    lorsque le moteur compresseur est à nouveau activé, faire fonctionner le moteur compresseur au rythme minimal optimal (fott) si l'intervalle de temps d'arrêt ((toff)N) est supérieur ou égal à l'intervalle de temps d'arrêt précédent, ou bien audit rythme supérieur (fmax) si l'intervalle de temps ((toff)N) est inférieur à l'intervalle de temps d'arrêt précédent ((toff)N-1).
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé par le fait de prévoir un cycle d'apprentissage pour déterminer la valeur du rythme optimal (fott) de fonctionnement du moteur compresseur.
  4. Procédé selon la revendication 3, caractérisé en ce que ledit cycle d'apprentissage est réalisé à chaque moment où la machine frigorifique est démarrée.
  5. Procédé selon l'une des revendications 3 ou 4, caractérisé par le fait de déterminer le rythme minimal de fonctionnement du moteur compresseur en dessous duquel il se produit une augmentation des pertes d'énergie du moteur compresseur, et en ce que ledit rythme minimal est considéré comme le rythme optimal (fott).
  6. Procédé selon l'une quelconque des revendications 3, 4 ou 5, caractérisé en ce que, pendant le cycle d'apprentissage, on détermine la catégorie à laquelle appartient la machine frigorifique en déterminant la durée de la période d'arrêt du moteur compresseur.
  7. Procédé selon l'une des revendications 5 ou 6, caractérisé par le fait de déterminer l'énergie (EC) absorbée par le moteur compresseur pendant une pluralité de cycles d'activation du moteur compresseur, de réduire le rythme de fonctionnement du moteur compresseur entre des cycles d'activation successifs jusqu'à ce qu'un rythme (fott) soit atteint en dessous duquel l'énergie absorbée pendant un cycle d'activation augmente par le fait des pertes dans le moteur compresseur, ledit rythme étant considéré comme le rythme optimal.
  8. Procédé selon la revendication 7, caractérisé par le fait de réduire le rythme de fonctionnement du moteur compresseur entre un cycle d'activation et le suivant uniquement si, pendant l'intervalle d'activation entre lesdits deux cycles d'activation successifs, le compartiment réfrigéré de la machine frigorifique n'a pas été ouvert.
  9. Procédé selon la revendication 8, caractérisé en ce que, si le compartiment réfrigéré de la machine frigorifique a été ouvert entre un cycle d'activation et un deuxième cycle d'activation, le moteur compresseur est forcé à fonctionner au rythme maximal (fmax) lors du deuxième cycle d'activation.
  10. Procédé selon la revendication 9, caractérisé par le fait de vérifier la survenue potentielle de l'ouverture du compartiment réfrigéré de la machine frigorifique en comparant la durée d'intervalles de temps d'arrêt successifs du moteur compresseur.
  11. Machine frigorifique comprenant un moteur compresseur et un circuit de régulation électronique pour réguler le moteur compresseur avec un microprocesseur et un programme de régulation, caractérisée en ce que ledit microprocesseur est programmé pour réaliser un procédé de régulation selon l'une ou plusieurs des revendications 1 à 10.
  12. Circuit de régulation pour une machine frigorifique à compression, comprenant un microprocesseur, caractérisé en ce que ledit microprocesseur est programmé pour réaliser un procédé de régulation selon l'une ou plusieurs des revendications 1 à 10.
EP01830751A 2000-12-13 2001-12-10 Procédé de réduction de la consommation d'énergie d'une machine frigorifique et machine frigorifique fonctionnant suivant ce procédé Expired - Lifetime EP1215454B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000FI000250A IT1314887B1 (it) 2000-12-13 2000-12-13 Metodo per la riduzione dei consumi energetici in una macchinafrigorifera, e macchina frigorifera operante secondo detto metodo
ITFI000250 2000-12-13

Publications (3)

Publication Number Publication Date
EP1215454A2 EP1215454A2 (fr) 2002-06-19
EP1215454A3 EP1215454A3 (fr) 2002-09-11
EP1215454B1 true EP1215454B1 (fr) 2004-10-13

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EP01830751A Expired - Lifetime EP1215454B1 (fr) 2000-12-13 2001-12-10 Procédé de réduction de la consommation d'énergie d'une machine frigorifique et machine frigorifique fonctionnant suivant ce procédé

Country Status (5)

Country Link
EP (1) EP1215454B1 (fr)
AT (1) ATE279699T1 (fr)
DE (1) DE60106377T2 (fr)
ES (1) ES2228788T3 (fr)
IT (1) IT1314887B1 (fr)

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ITVA20030039A1 (it) * 2003-10-21 2005-04-22 Whirlpool Co Congelatore orizzontale.
EP1990591A1 (fr) 2007-05-08 2008-11-12 Sorgenia S.P.A. Dispositif indépendant et universel pour contrôler la vitesse de compresseurs motorisés d'appareils domestiques réfrigérant et leur procédé de contrôle
DE102007032053A1 (de) * 2007-07-10 2009-01-15 Abröll, Andreas Vorrichtung und Verfahren zur Regulierung des Stromverbrauchs eines elektrischen Geräts
US9696077B2 (en) * 2012-02-21 2017-07-04 Whirlpool Corporation Dual capillary tube / heat exchanger in combination with cycle priming for reducing charge migration
US9285161B2 (en) * 2012-02-21 2016-03-15 Whirlpool Corporation Refrigerator with variable capacity compressor and cycle priming action through capacity control and associated methods
US9618246B2 (en) 2012-02-21 2017-04-11 Whirlpool Corporation Refrigeration arrangement and methods for reducing charge migration
BR102020017901A2 (pt) * 2020-09-01 2022-03-15 Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda. Método para definição automática de parâmetros de controle de capacidade de refrigeração em um inversor ou controlador

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Publication number Priority date Publication date Assignee Title
US4608833A (en) * 1984-12-24 1986-09-02 Borg-Warner Corporation Self-optimizing, capacity control system for inverter-driven centrifugal compressor based water chillers
US4831313A (en) * 1987-09-14 1989-05-16 Lennox Industries, Inc. Two speed motor controller
IT1247635B (it) * 1990-12-11 1994-12-28 Zanussi Elettromecc Perfezionamento nei motocompressori frigoriferi con controllo elettronico
JPH07332740A (ja) * 1994-06-03 1995-12-22 Toshiba Corp 空気調和機の運転制御方法
US5533349A (en) * 1994-12-16 1996-07-09 Robertshaw Controls Company Determination of ambient air temperature outside of an appliance
DK174114B1 (da) * 1996-10-09 2002-06-24 Danfoss Compressors Gmbh Fremgangsmåde til hastighedsregulering af en kompressor samt styring, der gør brug af fremgangsmåden
JPH10288408A (ja) * 1997-04-10 1998-10-27 Yaskawa Electric Corp 省エネルギー冷凍システムの制御方法
DE19753425C1 (de) * 1997-12-02 1999-08-12 Liebherr Hausgeraete Verfahren zur Steuerung der Drehzahl eines Kompressormotors eines Kühl- oder Gefriergeräts

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ES2228788T3 (es) 2005-04-16
EP1215454A3 (fr) 2002-09-11
ATE279699T1 (de) 2004-10-15
ITFI20000250A1 (it) 2002-06-13
IT1314887B1 (it) 2003-01-16
EP1215454A2 (fr) 2002-06-19
DE60106377T2 (de) 2005-10-20
DE60106377D1 (de) 2004-11-18

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