EP3105517B1 - Procédé de regulation de l'atmosphère d'une enceinte frigorifique - Google Patents

Procédé de regulation de l'atmosphère d'une enceinte frigorifique Download PDF

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Publication number
EP3105517B1
EP3105517B1 EP15709224.8A EP15709224A EP3105517B1 EP 3105517 B1 EP3105517 B1 EP 3105517B1 EP 15709224 A EP15709224 A EP 15709224A EP 3105517 B1 EP3105517 B1 EP 3105517B1
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EP
European Patent Office
Prior art keywords
setpoint
hygrometry
temperature
air flow
automaton
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EP15709224.8A
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German (de)
English (en)
French (fr)
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EP3105517A1 (fr
Inventor
Benoit DUPARC
Laurent KRZAK
Sandrine PETIT
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Dpkl
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Dpkl
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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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • 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
    • 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
    • F25B2600/11—Fan speed control
    • F25B2600/112—Fan speed control of evaporator fans
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0413—Treating air flowing to refrigeration compartments by purification by humidification
    • F25D2317/04131—Control means therefor
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature

Definitions

  • the present invention falls within the field of storage and preservation of food and agri-food products.
  • the invention specifically targets this conservation by refrigeration and control of the atmosphere of the place of storage and conservation.
  • the invention will find a preferential application in improving the operation of refrigerated enclosures for the storage and preservation of food products.
  • the invention aims to optimize the operation of refrigerated room devices, under controlled atmosphere or not.
  • said products may be fresh and constitute perishable foodstuffs.
  • foodstuffs can be plant products, namely fruits and vegetables. It will also find applications in the preservation of meat and fish, dairy products, in particular fermented products such as cheese, but also the field of salting such products. It also aims to preserve other natural products, such as plants, especially flowers.
  • the temperature of the product is higher than the temperature of saturated vapor from the atmosphere inside the enclosure.
  • the pressure of the water vapor at the surface of the product is always higher than that which prevails within the atmosphere, even when the latter is practically saturated. This state generates an evapotranspiration and drying effect on the products.
  • a known solution consists in carrying out a pressurized projection of water particles, in particular consisting of microdroplets, combined or not with water vapour, forming a cloud or dry fog which limits the deposition of water on the surface of the products.
  • a solution requires the installation of a complex hydraulic installation to install and maintain, requiring in particular to control the hardness of the water, to limit the limescale deposits in the circuit, as well as to treat it against the proliferations microbial and bacterial.
  • treatment agents such as chlorine
  • a climacteric fruit such as an apple, a pear or even a banana
  • ethylene by the phenomenon of breathing.
  • This component acts as a plant hormone, accelerating cell development and maturation. It is therefore necessary to control the ethylene content in the atmosphere of the enclosure, in order to control the aging of such fruits.
  • One solution consists of injecting a chemical agent into the enclosure to control the gas levels.
  • a chemical agent in order to counter the effects of ethylene, a gas of the cyclopropene type (or “1-methylcyclopropene” called “MCP”) is injected.
  • MCP cyclopropene type
  • a state-of-the-art solution as described in particular by the requests US 5,062,276 A , EP 2 447 651 A1 , and US 2007/137227 A1 , consists in controlling both the temperature and the humidity within the enclosure by acting jointly on the temperature of the evaporator and the speed of the fan associated with the evaporator.
  • the aim of the present invention is to overcome the drawbacks of the state of the art, by matching all the components of a refrigeration installation (in particular the compressor, the evaporator and the condenser) and by optimizing their operation according to the parameters desired, with the aim of preserving and preserving the quality of the stored foodstuffs.
  • the invention aims to maintain a constant humidity level of the air in the refrigerated enclosure, naturally, without adding water.
  • the invention aims not only to maintain a humidity level (for example between 90% and 100%) over a period of a few days, but the power to keep the humidity level constant throughout storage or refrigeration. the duration of which is typically between 2 and 12 months.
  • This object is obtained in particular by fixing the pressure of the fluid at the outlet of the condenser.
  • this discharge pressure at the outlet of the condenser is adjusted around a fixed pressure set point. This set point is fixed over time.
  • the subject of the invention is a method for regulating the temperature and the hygrometry of an internal air prevailing in a refrigerating enclosure according to claim 1.
  • the regulation method according to the invention makes it possible to limit the water stress undergone by the products, in particular fruits and vegetables, ensuring the maintenance of their density and their freshness, thereby limiting their quality and their losses. nutritional.
  • This water stress is reduced, on the one hand, by maintaining a low temperature difference between the evaporation temperature of the refrigerant within the evaporator and the temperature of the refrigeration enclosure, and, on the other hand, by reaching the temperature at which the internal atmosphere has the hygrometry rate corresponding to that of the hygrometry set point (and in the case where the hygrometry set point is 100%, the temperature at which the internal atmosphere becomes saturated of water vapor approaching the dew point) while keeping the current barometric conditions of the internal atmosphere unchanged.
  • the operation of the invention is natural, without the addition of any chemical agent or preservative, or treatment agent. It does not involve a hydraulic circuit, avoiding the related maintenance costs.
  • the implementation of the invention makes it possible to minimize the operating times of the various components of the refrigeration installation, to avoid certain problems linked to the operation of these components (for example the disruption of a pressure reducer in the refrigeration, fan shutdowns due to electrical tripping of their motors, blower motors tripping, icing up of the evaporator), to increase energy efficiency, to optimize the operation and lifespan of the refrigeration system, reduce noise pollution and achieve significant energy savings.
  • the invention allows the automatic management of the defrosting of the evaporator, which consequently makes it possible to considerably limit the loss of weight of the stored products and to reduce the energy expenditure of the refrigeration installation.
  • the invention also relates to a refrigeration installation for implementing the method.
  • the figure 1 represents a refrigeration installation 1 which comprises a refrigeration loop 2 and a refrigeration enclosure 3 crossed by the refrigeration loop 2 so as to be able to be cooled by a refrigerant fluid (for example freon) circulating in the refrigeration loop 2.
  • a refrigerant fluid for example freon
  • the refrigeration loop 2 comprises, in the direction of circulation of the fluid refrigerant, a compressor 4, a condenser 5, an expander 6 and an evaporator 7.
  • the compressor 4, the condenser 5 are arranged outside the refrigeration enclosure 3 while the evaporator 7 is arranged inside it. .
  • the latter can be arranged outside the refrigeration enclosure 3 (but in the immediate vicinity of the latter).
  • the production of cold is carried out by a succession of changes of state of the refrigerant which take place in the refrigeration loop 2 (the gaseous refrigerant becomes liquid in the condenser 5, it becomes partially gaseous in the expansion valve 6, and becomes gaseous again in the evaporator 7); these changes of state generate variations in temperature and pressure of the refrigerant and of the air prevailing around the heat exchangers formed by the condenser 5 and the evaporator 7 (an increase in the pressure and temperature of the refrigerant in the compressor 4, an increase in the temperature of the external air prevailing around the condenser 5, a drop in the pressure and temperature of the refrigerant fluid in the evaporator 7, and a drop in the temperature of the internal air prevailing around the evaporator 7).
  • the condenser 5 is associated with an external fan 8 (located outside the refrigeration enclosure 3) making it possible to generate an air flow through the condenser 5, and the evaporator 7 is associated with an internal fan 9 (located in the refrigeration enclosure 3) allowing an air flow to be generated through the evaporator 7.
  • the condenser 4, the external fan 8 and the internal fan 9 each comprise motors making it possible to vary their respective power (power of the compressor 4 and speed of the fans 8, 9).
  • the motor of the external fan 8 can be pole switching or variable frequency. The same applies to the internal fan motor 9.
  • the refrigeration loop 2 comprises a supply valve 10 which makes it possible to prevent or to allow the circulation of the refrigerant in the refrigeration loop 2.
  • This supply valve 10 is preferably located outside the refrigeration enclosure 3, located between the condenser 5 and the expansion valve 6.
  • the refrigeration installation also comprises a controller 11 making it possible to regulate the compressor 4, the external fan 8, the internal fan 9 and the supply valve 10 according to a temperature setpoint and a humidity setpoint of the the air inside the refrigeration enclosure 3.
  • the regulations of the compressor 4, of the external fan 8 and/or of the internal fan 9 are made by the automaton 11.
  • the regulations of the compressor 4 and of the internal fan 9 are made following an algorithm.
  • the regulation of the external fan 8 is made according to a PID regulation.
  • the automaton 11 is also connected to various probes 11, 13, 14, 15, 16, 17, 18 making it possible to know the physical parameters of the refrigerant, of the air in the refrigeration enclosure 3 and of the air around of the expander 5 and of the external fan 8.
  • these probes comprise a hygrometry probe 12 placed in the refrigeration enclosure 3, a first temperature probe 13 placed at the level of the suction side of the air from the internal fan 9, a second temperature sensor 14 arranged at the level of the air blowing side of the internal fan 9, a defrosting sensor 15 arranged on the evaporator 7 so as to detect the presence of frost, a third temperature sensor 16 placed close to the external fan 8 (preferably at the level of the air intake side), a first pressure probe 17 placed at the compressor inlet 4 and a second pressure probe 18 placed between the compressor 4 and co ndenser 5.
  • the invention relates to a method for regulating the temperature and humidity of the air located inside the refrigerated enclosure 3 according to the temperature setpoint and the humidity setpoint which are entered in the automaton 11 by a user. These temperature and hygrometry instructions depend on the products kept in the refrigerated chamber 3.
  • the regulation is carried out by the automaton 11 which compares, on the one hand, the temperature of the air located inside the refrigerated enclosure 3 with and the temperature setpoint, and, on the other hand, the hygrometry measured by the hygrometry probe 12 with the hygrometry set point.
  • the temperature which is compared with the temperature setpoint is that measured by the first temperature probe 13.
  • the controller 11 activates a process for producing cold so that the temperature of the The air inside the refrigeration chamber 3 drops and reaches the temperature setpoint. In the case where the temperature of the air located inside the refrigeration enclosure 3 is less than or equal to the temperature setpoint, the controller 11 activates a process for stopping the production of cold. Depending on the variation in temperature, the automaton 11 successively activates the process for producing cold and the process for stopping the production of cold.
  • the automaton 11 Prior to the activation of each cold production process, the automaton 11 verifies that the various organs included in the refrigeration loop 2 are in a state of being able to operate correctly. In the event that a member is not in a state of functioning correctly, the automaton 11 stops the regulation process and issues an alarm.
  • the cold production process includes a step of activating the refrigeration loop 2, followed by a series of temperature regulation control steps and the humidity of the air inside the refrigeration enclosure 3.
  • the automaton 11 opens the supply valve 10 then activates the compressor 4.
  • the automaton 11 compares the humidity and the air temperature with the hygrometry and temperature instructions. It is possible that the air humidity is higher than the humidity setpoint, or lower than this setpoint, or equal to it. Whatever one of the three cases, in order to vary the hygrometry of the interior of the enclosures 3, the automaton 11 regulates, on the one hand, a variable setpoint for the operation of the compressor 4 to vary the temperature of the refrigerant in the evaporator 7, and, on the other hand, a variable air flow setpoint of the internal fan 9. Depending on the variation of the difference between the measured humidity and the humidity setpoint, the automaton 11 regulates the air flow setpoints of the internal fan 9 and the operation of the compressor motor 4 differently.
  • the automaton 11 regulates the air flow setpoint of the internal fan 9 downwards and the lower compressor motor operating setpoint 4. Because the compressor motor operating setpoint 4 decreases, the temperature of the refrigerant in the evaporator 7 increases. Due to the fact that the temperature of the refrigerant in the evaporator 7 increases and the air flow of the internal fan 9 decreases, the water previously trapped on the heat exchange surface of the evaporator 7 is released and, consequently , the humidity of the air inside the refrigeration chamber 3 increases.
  • the automaton 11 regulates the air flow setpoint of the internal fan 9 upwards and the operating setpoint of the compressor motor 4 upwards. Because the compressor motor operating setpoint 4 increases, the temperature of the refrigerant in the evaporator 7 drops. As the temperature of the refrigerant in the evaporator 7 drops and the air flow from the internal fan 9 increases, the water contained in the air and trapped on the heat exchange surface of the evaporator 7 and , as a result, the humidity of the air inside the refrigeration enclosure 3 decreases.
  • the automaton 11 maintains equal the air flow setpoint of the external fan 8 and the setpoint of compressor operation 4.
  • the heat exchange surface of the evaporator 7 depends on the products to be kept in the refrigerated enclosure 3.
  • the ratio of the heat exchange surface of the evaporator 7 to the internal volume of the refrigerated enclosure 3 can vary from 0.4 m 2 /m 3 to 1.5 m 2 /m 3 . More precisely, the more the preservation of the products requires a high humidity setpoint, the more it will be necessary to have a high ratio, typically for a setpoint close to 100% humidity, the ratio should be between 1.3 m 2 /m 3 and 1.5 m 2 /m 3 .
  • the initial value of the variable operating setpoint of the compressor motor 4 is previously entered into the automaton 11. In general, this value depends on the product stored in the refrigeration chamber 3. Typically the initial value of the variable operating setpoint of the motor of compressor 4 corresponds to a percentage of the maximum power of this motor, for example 30%.
  • the variation in the value of the compressor motor operating setpoint 4 is determined by the automaton 11 from the difference between the hygrometry measured by the hygrometry probe 12 and the hygrometry setpoint.
  • the value of the variation of the operating setpoint of the motor of compressor 4 corresponds to a percentage of the maximum power of this motor, for example 10%.
  • the initial value of the variable setpoint of the air flow of the internal fan 9 is entered beforehand into the automaton 11. In general, this value depends on the product kept in the refrigerated enclosure 3 and takes into account the fact that the temperature of the the air prevailing in the refrigeration chamber 3 is well above the setpoint. In general, the initial value of the variable set point of the air flow rate of the internal fan 9 corresponds to a relatively high percentage of the maximum power of the motor of the internal fan 9 (typically, 50%).
  • the variation in the value of the air flow setpoint of the internal fan 9 is determined by the controller 11.
  • This variation in the value of the setpoint of the air flow of the internal fan 9 can be determined from the difference between the humidity measured by the humidity probe 12 and the humidity setpoint or from the difference between the temperature of the air prevailing in the refrigeration chamber and the temperature setpoint. It is preferable to determine the variation in the value of the setpoint of the air flow rate of the internal fan 9 from the difference between the measured humidity and the humidity setpoint.
  • the value of the variation of the variable setpoint of the air flow of the internal fan 9 can correspond to a percentage of the maximum power of the motor of the internal fan 9.
  • the air flow setpoint of the internal fan 9 can be determined as a function either of the difference between the temperature setpoint and the measured temperature, or of the difference between the humidity setpoint and the measured humidity, depending on what is used. The greater the difference, the higher the set point for the air flow rate of the internal fan 9.
  • the setpoint can be 100% of the power of the motor of the internal fan 9; for a difference between 5°C and 7°C, the setpoint can be 80% of the power of the motor of the internal fan 9; for a difference between 3°C and 5°C, the setpoint can be 65% the power of the internal fan motor 9; for a difference between 1°C and 3°C, the setpoint can be 50% of the power of the motor of the internal fan 9; and for 1 difference less than 1°C, the set point can be 30% of the power of the internal fan motor 9).
  • the variation in the value of the air flow setpoint of the internal fan 9 is determined from the difference between the measured humidity and the humidity setpoint and the difference between the measured temperature and the temperature setpoint , the choice of the difference used being determined from the speed of the drop in temperature of the air located inside the refrigeration chamber 3.
  • the variation in the value of the set point of the air flow rate of the internal fan 9 is determined from the difference between the hygrometry measured and the humidity setpoint, and, when the speed of the drop in the temperature of the air located inside the refrigeration enclosure 3 becomes less than or equal to the minimum speed, the variation in the value of the setpoint of the air flow of the internal fan 9 is determined from the difference between the measured temperature and the temperature setpoint.
  • the minimum rate of air temperature drop can be expressed by a rate of temperature drop (e.g.
  • the air flow set point of the internal fan 9 is determined from the difference between the measured humidity and the humidity set point, the air flow set point is all the more high that the difference is significant, and, when the variation of the value of the setpoint of the air flow of the internal fan 9 is determined from the difference between the measured temperature and the temperature setpoint, in order to increase speed of the air temperature drop, the air flow set point is increased by a fixed value (for example a percentage of the maximum power of the internal fan motor 9 - here, 10%).
  • the variation of the air flow setpoint value is again determined from the difference between the measured humidity and the humidity setpoint, and if it remains less than or equal to the minimum speed, the variation of the value of the setpoint of the air flow of the internal fan 9 continues to be determined is determined from the difference between the measured temperature and the temperature setpoint.
  • the controller 11 regulates the operation of the motor of the compressor 4 to regulate the temperature of the refrigerant in the evaporator 7, the constant maintenance of the pressure of the refrigerant at the outlet of the compressor 4 is no longer regulated by the latter. . Therefore, during the entire series of steps for controlling the temperature regulation and the humidity of the air located inside the refrigerated enclosure 3, the controller 11 activates the fan external 8 to a variable air flow setpoint so as to keep constant the pressure of the refrigerant at the outlet of the condenser 5 (and therefore at the inlet of the expansion valve 6) throughout the duration of the cold production processes of the process for regulating the the temperature and humidity of the air located inside the refrigeration enclosure 3.
  • the pressure of the refrigerant at the outlet of the condenser 5 can thus be set at 20 bars.
  • the initial value of the variable setpoint of the airflow of the external fan 8 is previously entered into the automaton 11.
  • this initial value of the variable setpoint of the airflow of the external fan 8 corresponds to a percentage of the maximum power of the motor of the external fan 8 (in general, this value is zero, but, depending on the type of products stored in the refrigerated enclosure 3, it can be non-zero, for example between 5 and 20%).
  • the variation in the value of the setpoint of the air flow of the external fan 8 is determined by the automaton 11 from, mainly, the difference between the fixed pressure setpoint at the outlet of the condenser 5 and the pressure measured by the second pressure sensor 18 which depends on the compressor 4 operating set point. It is also determined according to the temperature measured by the third temperature sensor 16. extract the necessary number of calories from the refrigerant to reach the fixed pressure setpoint. Thus, if the compressor motor operating setpoint 4 increases, the automaton 11 increases the airflow setpoint value of the external fan 8 so as to extract a greater number of calories at the level of the condenser 5.
  • the controller 11 decreases the value of the airflow setpoint of the external fan 8 or stops the external fan 8 so as to extract a smaller number of calories at the level of the condenser 5 Typically the value of the variation of the variable setpoint of the air flow of the external fan 8 corresponds to a percentage of the maximum power of the motor of the external fan 8.
  • the pressure of the refrigerant at the outlet of the condenser 5 is kept constant and serves as a point of equilibrium for the refrigerant, and the controller 11 can simultaneously, and with extreme precision, regulate the power of the compressor motor 4, the temperature of the refrigerant in the evaporator 7, the speed of the air flow from the internal fan 9 and the temperature and humidity of the air inside the refrigeration enclosure 3.
  • the process for stopping the production of cold comprises a step of deactivating the refrigeration loop 2, followed by a series of steps for controlling the regulation of the humidity of the air located inside the refrigeration chamber 3.
  • the automaton 11 deactivates the compressor 4 and the internal fan 8 and closes supply valve 10.
  • the controller 11 compares the humidity measured by the humidity probe 12 with the humidity setpoint. It is possible that the air humidity is lower than the humidity set point, or higher than or equal to this set point.
  • the automaton 11 regulates the variable air flow setpoint of the internal fan 9 differently in order to vary the humidity inside the enclosure 3.
  • the controller 11 regulates the airflow setpoint of the internal fan 9 so that the humidity measured approaches the humidity setpoint.
  • the PLC regulates the internal fan airflow set point downwards.
  • the regulation of the airflow of the internal fan 9 can be carried out according to the difference between the humidity setpoint and the measured humidity, the greater the difference, the higher the airflow setpoint.
  • the automaton 11 stops the internal fan 9.
  • the initial value of the variable setpoint of the air flow rate of the internal fan 9 is entered beforehand into the automaton 11. In general, this value depends on the product stored in the refrigerated enclosure 3 and takes into account the fact that the temperature of the air in the refrigeration chamber is equal to the setpoint. In general, the initial value of the variable air flow setpoint of the internal fan 9 corresponds to a low percentage of the maximum power of the motor of the internal fan 9 (typically, 10%).
  • the variation in the value of the set point of the air flow of the internal fan 9 is determined by the automaton 11. This variation of the set value of the air flow of the internal fan 9 is determined from the difference Between the hygrometry measured by the hygrometry probe 12 and the hygrometry set point. The value of the variation of the variable setpoint of the air flow of the internal fan 9 can correspond to a percentage of the maximum power of the motor of the internal fan 9.
  • the method in accordance with the present invention makes it possible to precisely regulate the temperature and the humidity of the air which is located inside the refrigeration enclosure 3 by varying the air flow rate of the internal fan 9.
  • the setpoint of hygrometry which can be between 50% and 100% hygrometry, can be respected to at least 1%
  • the regulation method according to the invention makes it possible to obtain a temperature differential of between 0.2° and 3° C. (and not between 3° C. and 10°C as in known refrigerating devices). This drop in the temperature differential also saves energy and, when the temperature of the air inside the refrigerated enclosure 3 is below 0° C., a reduction in the risk of frost on the surface of evaporator heat exchange 7.
  • the defrost probe 15 enables the automaton 11 to activate a defrosting process only if necessary (and not systematically as in known refrigerating devices) and only for the time necessary.
  • the automaton 11 When the defrost sensor 15 indicates the presence of frost, the automaton 11 either activates the internal fan 9 (if it is stopped) or increases its air flow set point (if it is activated) so that the frost melts by the action of forced air.
  • the triggering of the defrosting process can also be achieved due to the measurement by the second temperature probe 14 of a value indicating the presence of ice (frost). It is possible to use the latent heat of melting ice. This type of defrosting makes it possible in particular to raise the humidity level.
  • the present invention makes it possible to have a small difference between the temperatures measured by the first and second temperature probes 13, 14 (less than 3° C.) and to permanently adjust the air flow of the internal fan 9, the flow air from the external fan 8 and the operation of the compressor 4. It follows that the evaporation of water from the surface of the stored foodstuffs is minimal, if not zero.
  • This management of the hygrometry is carried out precisely thanks to a very small variation in the temperature of the air in the refrigeration enclosure 3, to less ventilation and above all to a management of various parameters according to the diagram of the humid air, these parameters being measured in real time in the refrigeration chamber 3.
  • the figure 2 shows, as a function of time, a curve 100 illustrating the evolution of the air temperatures measured inside the refrigeration enclosure 3.
  • the time line of the abscissas is not regular but the duration of each of its intervals of time it is stipulated.
  • the implementation of the process makes it possible to manage the temperature to within 0.1°C.
  • the humidity setpoint for the air in the refrigeration enclosure 3 is 96% and the temperature setpoint for this air is 0°C. As illustrated on the figure 2 , it is the refrigerant (curve 101) which is cooled before the air (curve 100).
  • Point 102 corresponds to the opening of the supply valve 10, the air and refrigerant temperatures are close to 2°C.
  • the air humidity is 98%
  • its temperature is 1.9°C
  • the temperature of the refrigerant in the evaporator 7 is -5°C
  • the flow setpoint of air from the internal fan 9 is 60% of the maximum power of the fan motor, these 60% correspond to a mixing rate of 30 volumes of the refrigeration chamber 3 per hour.
  • the humidity of the air is 99%, its temperature is 1.6°C, that of the refrigerant is - 7°C and the air flow setpoint is still 60%.
  • the air humidity is 91%
  • its temperature is 1.4°C
  • that of the refrigerant is 0.2°C
  • the air flow set point is 20%.
  • the humidity of the air is 94%, its temperature is 1.2°C, that of the refrigerant is - 2°C and the air flow setpoint is still 20%.
  • the humidity of the air is 98%, its temperature is 0.9°C, that of the refrigerant is -5°C and the air flow set point is 40%.
  • the air humidity is 94%
  • its temperature is 0.6°C
  • that of the refrigerant is - 7°C
  • the air flow set point is again 60% .
  • the air humidity is 96%
  • its temperature is 0.5°C
  • that of the refrigerant is - 0.5°C
  • the air flow set point is again 20%.
  • the air humidity is 99%, its temperature is 0.3°C, that of the refrigerant is - 4°C and the air flow set point is again 40% .
  • the humidity of the air is 96%, its temperature is 0° C. and the internal fan 9 is stopped (until the humidity level where the temperature varies again).
  • the method according to the invention makes it possible to accurately control the humidity level inside the refrigeration enclosure 3, from a point of equilibrium fixed at the level of the condenser 5 and maintained around a fixed setpoint pressure through the management of the ventilation at this level, as well as the management of the ventilation inside said enclosure 3.
  • said fluid may consist of a refrigerant liquid, especially glycol water. Ventilation management is then carried out in the same way to control the humidity inside enclosure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Air Conditioning Control Device (AREA)
EP15709224.8A 2014-02-06 2015-02-06 Procédé de regulation de l'atmosphère d'une enceinte frigorifique Active EP3105517B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HRP20221133TT HRP20221133T1 (hr) 2014-02-06 2015-02-06 Postupak reguliranja atmosfere u rashladnom prostoru

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1450901A FR3017200A1 (fr) 2014-02-06 2014-02-06 Procede de regulation de l'atmosphere d'une enceinte frigorifique.
PCT/FR2014/050767 WO2015118232A1 (fr) 2014-02-06 2014-03-31 Procede de regulation de l'atmosphere d'une enceinte frigorifique
PCT/FR2015/050293 WO2015118277A1 (fr) 2014-02-06 2015-02-06 Procede de regulation de l'atmosphere d'une enceinte frigorifique

Publications (2)

Publication Number Publication Date
EP3105517A1 EP3105517A1 (fr) 2016-12-21
EP3105517B1 true EP3105517B1 (fr) 2022-08-10

Family

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Application Number Title Priority Date Filing Date
EP15709224.8A Active EP3105517B1 (fr) 2014-02-06 2015-02-06 Procédé de regulation de l'atmosphère d'une enceinte frigorifique

Country Status (9)

Country Link
EP (1) EP3105517B1 (hr)
DK (1) DK3105517T3 (hr)
ES (1) ES2927796T3 (hr)
FR (2) FR3017200A1 (hr)
HR (1) HRP20221133T1 (hr)
HU (1) HUE060069T2 (hr)
PL (1) PL3105517T3 (hr)
PT (1) PT3105517T (hr)
WO (2) WO2015118232A1 (hr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105940981B (zh) * 2016-06-15 2023-06-23 广西壮族自治区农业科学院甘蔗研究所 一种利用1-mcp研究苗期甘蔗抗旱性的装置
US10955164B2 (en) 2016-07-14 2021-03-23 Ademco Inc. Dehumidification control system
US11796241B2 (en) 2020-10-14 2023-10-24 Viking Range, Llc Method and apparatus for controlling humidity within a compartment of refrigeration appliance
FR3122722B1 (fr) * 2021-05-05 2023-04-07 Dpkl Procédé de pilotage de la température et de l’hygrométrie de l’air contenu dans une enceinte réfrigérée

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5062276A (en) * 1990-09-20 1991-11-05 Electric Power Research Institute, Inc. Humidity control for variable speed air conditioner
DE20321771U1 (de) * 2003-06-11 2009-10-29 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit gesteuerter Entfeuchtung
EP2447651B1 (en) * 2010-10-27 2017-05-24 Whirlpool Corporation Refrigeration appliance with a humidity control and method for controlling such appliance
EP2546084A1 (en) * 2011-07-12 2013-01-16 A.P. Møller - Mærsk A/S Humidity control in a refrigerated transport container with an intermittently operated compressor

Also Published As

Publication number Publication date
WO2015118232A1 (fr) 2015-08-13
FR3017200A1 (fr) 2015-08-07
FR3017201A1 (fr) 2015-08-07
PL3105517T3 (pl) 2022-10-31
HUE060069T2 (hu) 2023-01-28
WO2015118277A1 (fr) 2015-08-13
HRP20221133T1 (hr) 2022-11-25
PT3105517T (pt) 2022-09-23
DK3105517T3 (da) 2022-10-03
EP3105517A1 (fr) 2016-12-21
FR3017201B1 (fr) 2019-08-02
ES2927796T3 (es) 2022-11-11

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