WO2020149700A1 - Refroidisseur unitaire - Google Patents

Refroidisseur unitaire Download PDF

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Publication number
WO2020149700A1
WO2020149700A1 PCT/KR2020/000866 KR2020000866W WO2020149700A1 WO 2020149700 A1 WO2020149700 A1 WO 2020149700A1 KR 2020000866 W KR2020000866 W KR 2020000866W WO 2020149700 A1 WO2020149700 A1 WO 2020149700A1
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WO
WIPO (PCT)
Prior art keywords
evaporator
frost
path
air
sensor
Prior art date
Application number
PCT/KR2020/000866
Other languages
English (en)
Korean (ko)
Inventor
류병진
박상일
유윤호
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Publication of WO2020149700A1 publication Critical patent/WO2020149700A1/fr

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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
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
    • 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
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D23/00—General constructional features
    • 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
    • F25D23/00—General constructional features
    • F25D23/006—General constructional features for mounting refrigerating machinery 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • F25B2700/111—Sensor to detect if defrost is necessary using an emitter and receiver, e.g. sensing by emitting light or other radiation and receiving reflection by a sensor

Definitions

  • the present invention relates to a unit cooler for refrigeration or refrigeration, and more particularly, to a unicooler capable of more accurately detecting an amount of frost formed on an evaporator by installing a sensor module in an optimal position.
  • a unit cooler is a cooling device composed of an evaporator and a fan, and a refrigerant passes through the evaporator to cool the air around the evaporator, and the cooled air is placed inside the fan (for example, a refrigeration warehouse).
  • the room may be cooled by blowing air.
  • the unit cooler according to the related art has a problem in that cooling efficiency is lowered due to condensation and freezing of moisture in the air during the evaporation process of the refrigerant, so that frost forms on the evaporator.
  • a defrost heater is installed on the unit cooler to remove frost frost on the evaporator, but the defrost heater is set to operate at a constant cycle, so that energy is consumed more than necessary or the life of the defrost heater is shortened. There was a problem.
  • the amount of frost frost on the evaporator may differ depending on the internal and external factors of the unit cooler, such as the season, weather, temperature, humidity in which the unit cooler is operated, and the time or frequency that the indoor space, which is the target space for cooling, is exposed to the outside.
  • unnecessary energy may be consumed when the defrost heater is operated at a constant cycle, freshness of food stored in the room may be reduced, and the life of the defrost heater is shortened for repair and replacement. This can lead to costly problems.
  • the first problem to be solved by the present invention is to provide a unit cooler capable of controlling whether an operation for defrosting is performed based on the amount of frost formed on the evaporator.
  • the second problem to be solved by the present invention is to provide a unit cooler capable of more accurately measuring the amount of frost formation in different frosts depending on the position on the evaporator.
  • a third problem to be solved by the present invention is to provide a unit cooler capable of effectively removing frost frosting on a sensor.
  • the unit cooler according to the present invention, an evaporator; Indoor fan; A sensor module detecting an amount of frost formed on the evaporator; And a control unit configured to control frost removal on the evaporator when the frost formation amount detected by the sensor module is greater than or equal to a reference value, and the sensor module includes air passing through the evaporator in an area where the evaporator is disposed. Is installed in a position corresponding to a relatively fast area (hereinafter referred to as a reference area).
  • a path through which the air passing through the evaporator flows includes: a suction path that is a path before air passes through the evaporator; A residence path, which is a path during which air passes through the evaporator; And a discharge path, which is a path after air passes through the evaporator, and a resistance (hereinafter, suction resistance) that hinders the flow of air on the suction path may vary depending on a direction from an area where the evaporator is disposed. .
  • the flow rate of air passing through the evaporator is inversely proportional to the suction resistance, and the reference region may be an area through which air sucked in a direction in which the suction resistance is relatively small, passes among regions in which the evaporator is disposed.
  • the area in which the evaporator is disposed is a rectangular area having upper and lower left and right corners and divided into four quadrants, and the suction resistance is any one of the upper and lower left and right corners, from first and second corners adjacent to each other. Relatively small in the direction of, the reference region may be present on a quadrant including a portion of the first and second corners among the four quadrants.
  • the area in which the evaporator is disposed is determined by using a point at which the height and the left and right widths intersect the first and second edges as an origin, and the reference area is 1/4 point of the height above and below the origin. And a region within a third of the left and right widths.
  • the sensor module may include a sensor that detects the amount of frost formation on the frost, and the detection unit may include a heating element that generates heat when a predetermined current flows and removes frost frost on the sensor. It may include a plurality of heating elements disposed at a predetermined distance from the sensor to surround the sensor.
  • the sensor module can control whether or not an operation for defrosting is performed based on the frost frost amount.
  • the sensor module is installed at a position corresponding to a region where the flow rate of air passing through the evaporator is relatively fast, so that the amount of frost formed on the evaporator can be more accurately measured.
  • a plurality of heating elements are disposed to surround the sensor, so that frost frosting on the sensor can be effectively removed.
  • FIG. 1 is a view showing a state in which the unit cooler installed in the freezing warehouse according to an embodiment of the present invention
  • FIG 2 is a front view of the unit cooler shown in Figure 1
  • FIG. 3 is a schematic diagram of a unit cooler and an outdoor unit according to an embodiment of the present invention
  • FIG. 4 is a perspective view of a sensing unit according to an embodiment of the present invention.
  • FIG. 5 is a view showing a state in which the sensor module according to an embodiment of the present invention is fixed to the evaporator
  • FIG. 6 is a view for explaining the optimal installation position of the sensor module according to an embodiment of the present invention.
  • FIG. 7 is a view for explaining the output of the sensor according to the operating time for each installation position of the sensor module shown in FIG. 6;
  • FIGS. 1 to 3 a unit cooler according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3.
  • FIG. 1 is a view showing a unit cooler installed in a freezing warehouse according to an embodiment of the present invention
  • Figure 2 is a front view of the unit cooler shown in Figure 1
  • Figure 3 is a unit cooler according to an embodiment of the present invention It is a schematic diagram of the outdoor unit.
  • a plurality of unit coolers 1b may be installed on the ceiling of a freezing warehouse, and refrigerated or frozen foods may be stored in the freezing warehouse.
  • the unit cooler 1b may be connected to the outdoor unit 1a by a refrigerant pipe, and the cooling operation by the outdoor unit 1a and the unit cooler 1b may be performed with reference to FIGS. 2 and 3.
  • the explanation is as follows.
  • the outdoor unit 1a may include a compressor 2, an outdoor heat exchanger 3, an outdoor fan 4, an expansion mechanism 5, a four-way valve 6, and an accumulator 7, and may be an indoor unit or unit cooler.
  • (1b) may include an indoor heat exchanger (8) and an indoor fan (9).
  • the heat exchange cycle is performed by switching the flow path of the refrigerant with the four-way valve 6 so that the outdoor heat exchanger 3 functions as an evaporator and the indoor heat exchanger 8 functions as a condenser.
  • the present invention aims to more accurately detect the amount of frost formed on the evaporator when cooling indoors, so that the cooling cycle will be described in detail below.
  • the low-temperature, low-pressure refrigerant flowing into the compressor 2 from the accumulator 7 is discharged in a high-temperature, high-pressure state from the compressor 2 driven by the compressor electric motor 2a. Can.
  • the refrigerant discharged from the compressor (2) flows into the outdoor heat exchanger (3), and can be exchanged with outdoor air.
  • the outdoor heat exchanger 3 can be understood as a condenser.
  • the amount of air provided to the outdoor heat exchanger 3 can be controlled by the outdoor fan 4 driven by the electric motor 4a for the outdoor fan.
  • the refrigerant that has passed through the outdoor heat exchanger (3) passes through the expansion mechanism (5) and can expand at low temperature and low pressure.
  • the refrigerant that has passed through the expansion mechanism (5) flows into the indoor heat exchanger (8), and may exchange heat with indoor air.
  • the indoor heat exchanger 8 since the heat energy of the indoor air is transferred to the refrigerant, the temperature of the indoor air is lowered and the refrigerant is evaporated, so the indoor heat exchanger 8 can be understood as an evaporator.
  • the amount of air provided to the indoor heat exchanger 8 can be controlled by the indoor fan 9 driven by the indoor fan electric motor 9a. This allows the interior to be cooled.
  • the refrigerant that has passed through the indoor heat exchanger (8) may flow into the accumulator (7) through the four-way valve (6).
  • the accumulator 7 can supply the gasified refrigerant to the compressor 2, thereby completing the cooling cycle by the outdoor unit 1a and the unit cooler 1b.
  • the outdoor heat exchanger 3 is called a condenser 3
  • the indoor heat exchanger 8 is called an evaporator 8.
  • the air passing through the evaporator 8 contains moisture, as the moisture of the air passing through the evaporator 8 condenses and freezes during the evaporation process of the refrigerant in the evaporator 8, the evaporator 8 Frosting may occur and cooling efficiency may decrease.
  • the present invention was devised to more accurately detect the amount of frost formation in the frost, while allowing the configuration for removing frost frost on the evaporator 8 to operate based on the frost frost amount on the vaporizer 8.
  • FIG. 4 is a perspective view of a sensing unit according to an embodiment of the present invention
  • FIG. 5 is a view showing a sensor module according to an embodiment of the present invention fixed to an evaporator
  • FIG. 6 is a sensor module according to an embodiment of the present invention 7 is a view for explaining an optimal installation position
  • FIG. 7 is a view for explaining the output of the sensor according to the operation time for each installation position of the sensor module shown in FIG. 6.
  • the unit cooler 1b includes a sensor module 10 and a control unit 50 in addition to the evaporator 8 and the indoor fan 9 described above.
  • the evaporator 8 which is an indoor heat exchanger, is connected to the condenser 3 which is an outdoor heat exchanger, and includes a refrigerant pipe 8a having a flow path through which refrigerant flows. That is, the refrigerant flows through the refrigerant pipe 8a of the evaporator 8 and absorbs heat energy from air passing through the evaporator 8 to be evaporated.
  • the refrigerant pipe (8a) is a cylindrical bar (bar) shape is continuously formed, spaced up and down can be arranged in multiples.
  • this is only an example, and the shape and arrangement of the refrigerant pipe 8a are not limited thereto.
  • the evaporator 8 may include a cooling fin 8b that facilitates heat exchange between air and refrigerant passing through the evaporator 8.
  • the indoor fan 9 may cause the flow of air passing through the evaporator 8. That is, the air passing through the evaporator 8 can be cooled by discharging heat energy as a refrigerant flowing through the refrigerant pipe 8a, and the indoor fan is cooled by blowing the cooled air into the room. Can.
  • frost may be formed on the evaporator 8.
  • the sensor module 10 may detect an amount of frost formed on the evaporator 8 and may include a fixing unit 20 and a sensing unit 30 as illustrated in FIG. 5.
  • the fixing unit 20 of the sensor module 10 may be detachably fixed to the evaporator 8.
  • the sensing unit 30 of the sensor module 10 is connected to or coupled to the fixing unit 20 and is arranged to be spaced a predetermined distance from the evaporator 8 to detect the amount of frost formed on the evaporator 8. .
  • the fixing part 20 may be fixed to the refrigerant pipe 8a of the evaporator 8.
  • the fixing part 20 may include a body 21 and legs 22.
  • the sensing unit 30 may be coupled to the body 21.
  • the body 21 and the base 31 may be snap-fit through the snap holes 32a and 32b formed in the base 31 of the sensing unit 30.
  • the legs 22 may be formed extending from the body 21 toward the evaporator 8. In addition, the leg 22 can be fixed to the refrigerant pipe (8a).
  • the leg 22 may be structurally fixed to the refrigerant pipe 8a, and as shown in FIG. 5, the inner circumferential surface of the leg 22 is fixed to be detachably attached to at least a portion of the outer circumferential surface of the refrigerant pipe 8a.
  • the leg 22 may be a bar holder having an inner circumferential surface formed in an arc shape.
  • the sensing unit 30 may be arranged to be spaced a predetermined distance from the evaporator 8.
  • the sensing unit 30 may be provided on one surface facing the evaporator 8 and may include a sensor 33 for detecting the amount of frost formed on the evaporator 8.
  • the sensor 33 may be an infrared sensor that detects an amount of frost frost by measuring the degree of reflection of the infrared (IR) emitted toward the evaporator 8 by the evaporator 8.
  • IR infrared
  • the sensor 33 may include a light emitting part 34 and a light receiving part 35.
  • the electrical signal value and the reference signal value detected when light of the infrared (IR) wavelength band emitted from the light emitting part 34 is reflected by the evaporator 8 or the frost formed on the evaporator 8 and received by the light receiving part 35 Depending on the difference from, it is possible to detect the amount of frost frost.
  • the reference signal value may be an electrical signal value that is received and sensed by the light receiving unit 35 when frost is not formed in the evaporator 8.
  • the senor 33 may detect an amount of frost formed on the evaporator 8 as other means and configurations, such as a differential pressure sensor and a temperature sensor.
  • the sensor module 10 may be disposed on an upstream side of a path (hereinafter, an air flow path) through which air passing through the evaporator 8 flows.
  • the sensor 33 is disposed to face the evaporator 8
  • the sensor 33 is compared to the case where the sensor module 10 is disposed on the upstream side of the air flow path on the downstream side. This is because it is advantageous to prevent frost frosting.
  • the control unit 50 may control so that the frost frosted on the evaporator 8 is removed when the frost frost on the evaporator 8 sensed by the sensor module 10 or the sensor 33 is greater than or equal to a predetermined reference value. have.
  • the control unit 50 includes application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, processors ( controllers), micro-controllers, microprocessors, and other electrical units for performing other functions.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors processors
  • controllers micro-controllers
  • microprocessors microprocessors, and other electrical units for performing other functions.
  • the unit cooler 1b is configured to remove frost frosted on the evaporator 8, using high-temperature, high-pressure gas discharged from the compressor 2, or directly to the evaporator 8 It may be provided by spraying water at room temperature or switching the flow path of the refrigerant with the four-way valve 6 so that the defrost cycle is performed.
  • the unit cooler 1b is configured to remove frost frosted on the evaporator 8, and may include a defrost heater 40.
  • the defrost heater 40 may be an electric heater that generates heat when a predetermined current flows and removes frost formed on the evaporator 8.
  • the defrost heater 40 is disposed to surround at least a portion of the evaporator 8, and can uniformly supply heat to the entire evaporator 8 to remove frost.
  • the control unit 50 determines whether a refrigerant is supplied to the refrigerant pipe 8a, whether the indoor fan 9 is operated, and whether the defrost heater 40 is used. It is possible to determine whether the defrosting operation is performed by controlling whether or not the operation is performed.
  • the control unit 50 When the frost formation amount of the frost is less than the reference value, the control unit 50 is supplied with refrigerant to the refrigerant pipe 8a for cooling operation of the unit cooler 1b, the indoor fan 9 is operated, and the defrost heater 40 ) Can be controlled to stop.
  • the control unit 50 blocks the supply of refrigerant to the refrigerant pipe 8a to remove frost, and allows the indoor fan 9 to stop to cool the unit cooler 1b. And the defrost heater 40 may be controlled to operate.
  • control unit 50 determines whether the defrosting operation for the entire evaporator 8 based on the frost frost amount detected by the sensor module 10, the sensor module 10 is the evaporator 8 It is possible to detect the amount of frost on the frost that is implanted in one of the parts.
  • the flow rate of air passing through the evaporator 8 may be different depending on the position on the evaporator 8, in this case, depending on the installation position or sensing part on the evaporator 8 of the sensor module 10,
  • the start and end times of the defrosting operation of the control unit 50 may be different.
  • the installation position of the sensor module 10 on the evaporator 8 is optimized to more accurately detect the amount of frost formed on the evaporator 8 so that the defrosting operation of the controller 50 can be started and terminated in a timely manner. It is necessary to do this, and the present invention has been devised to solve this.
  • the portion in which the sensor module 10 detects frost frosting amount is preferably a portion where the frost frost frost amount changes continuously between cooling operation or defrosting operation of the unit cooler 1b, and will be described later in more detail.
  • the sensor module 10 by installing the sensor module 10 at a position corresponding to an area (hereinafter referred to as a reference area) where the flow rate of air passing through the evaporator 8 is relatively fast among the areas where the evaporator 8 is disposed, the sensor module ( 10) It will be specifically described that the amount of frost formed on the evaporator 8 can be more accurately sensed.
  • the flow rate of air passing through the evaporator 8 may vary depending on the position on the evaporator 8, and the sensor module is analyzed by analyzing characteristics related to frost formation according to the flow rate of the air passing through the evaporator 8 ( Describes optimizing the installation location of 10).
  • a path through which the air passing through the evaporator 8 flows may include an intake path, a residence path, and a discharge path based on the evaporator 8. .
  • the suction path is a path until the air passes through the evaporator 8
  • the residence path is a path during which the air passes through the evaporator 8
  • the discharge path is after the air passes through the evaporator 8 It is a path.
  • a predetermined structure which is different depending on the direction, is disposed around the evaporator 8, and such a structure hinders the flow of air, so the resistance (hereinafter, the suction resistance) that hinders the flow of air on the suction path is: It may vary depending on the direction from the area (A) where the evaporator (8) is placed.
  • the air passages in the up, down, left, and right directions based on the area A in which the evaporator 8 is disposed may be asymmetric, and as a result, the suction resistance may also be asymmetric.
  • the flow rate of air passing through the evaporator 8 can be inversely proportional to the suction resistance. That is, when the suction path is relatively long or is narrowly formed due to an obstacle or the like and the suction resistance is relatively large, the flow velocity of air passing through the suction path may be relatively slow.
  • the area in which the evaporator 8 is disposed may have a rectangular area having upper, lower, left, and right corners and divided into four quadrants.
  • the suction resistance is any two of the upper, lower, left, and right corners, and may be relatively small in directions from the first and second corners adjacent to each other. More specifically, the suction resistance is different depending on the direction from the upper, lower, left, and right corners, but the suction resistance is the smallest in the direction from the first edge, and the suction resistance is the next from the second edge. Can be small.
  • the unit cooler 1b may be installed on the ceiling of a freezing warehouse, and a liquid phase is disposed on the right side of the area A where the evaporator 8 is disposed.
  • a region B in which a machine room including a distributor for distributing refrigerant, a header for laminating gaseous refrigerant, a part of the electric motor 9a for indoor fans, and the like is disposed.
  • the suction resistance to the area A where the evaporator 8 is disposed is upper, right, left, and left of the area A where the evaporator 8 is disposed. It may be large in the order of the downward direction.
  • the ceiling is present in the upward direction, so the suction resistance in the upper direction is large in the first order, and the mechanical chamber is present in the right direction, so that the suction resistance in the right direction is greater in the second order, and the left Since the direction is adjacent to the ceiling, the suction resistance in the left direction is large in the third order, and the suction resistance in the lower direction without a special flow disturbance element may be large in the fourth order.
  • the flow rate of air passing through the evaporator 8 is inversely proportional to the suction resistance, as shown in FIG. 6, based on the area A where the evaporator 8 is disposed, air passing through the evaporator 8
  • the flow velocity of may be faster toward the lower and left directions.
  • the lower direction may be the direction from the first corner
  • the left direction may be the direction from the second corner
  • the right direction may be the direction from the third corner
  • the upper direction may be the direction from the fourth corner.
  • the flow rate of air passing through the evaporator (8) may be faster toward the direction from the first and second edges.
  • the flow rate of air passing through the evaporator 8 may vary depending on the position on the region A where the evaporator 8 is disposed, and is particularly fast in the direction from the first and second edges described above.
  • the fast flow rate of air passing through the evaporator 8 may mean that the amount of convective heat transfer from the air to the refrigerant is large, and that the flow rate of air passing through the evaporator 8 is large.
  • the amount of convective heat transfer from the air to the refrigerant is relatively large in the portion of the evaporator 8 through which air having a relatively fast flow rate passes, so that the degree of cooling of the air and the degree of overheating of the refrigerant can be relatively large.
  • the graph shown in FIG. 6 is an actual measured data value, and the flow velocity of air passing through the evaporator 8 increases toward the lower and left directions, and correspondingly, the degree of cooling of the air, that is, passing through the evaporator 8 It can be seen that the air temperature difference ( ⁇ T) before and after also increases as it goes toward the lower and left directions.
  • the flow rate of air is relatively large in the portion of the evaporator 8 through which the air having a relatively fast flow rate passes, the supply of moisture that may be implanted in the evaporator 8 may be relatively large.
  • implantation growth to the castle proceeds rapidly due to a reduction in the degree of superheat of the refrigerant. It can be seen that implantation growth may stagnate after some point.
  • the sensor module 10 is installed in a position corresponding to an area (hereinafter referred to as a reference area) where the flow rate of air passing through the evaporator 8 is relatively fast among the areas A where the evaporator 8 is disposed. desirable.
  • the reference area may be an area through which the air sucked in a direction in which the suction resistance is relatively small passes among the areas A in which the evaporator 8 is disposed.
  • the reference region may be present on a quadrant that includes a portion of the first and second corners when the region A in which the evaporator 8 is disposed is divided into four quadrants. It can be seen from the foregoing that the quadrant is an area through which air having a relatively high flow rate passes, compared to the remaining quadrants.
  • the unit cooler 1b according to the present invention is installed on the ceiling of a freezing warehouse, and a machine room is disposed on the right side of the area A where the evaporator 8 is disposed. It can be seen from the above that the first edge is the lower edge, and the second edge is the left edge when the region B is to be present.
  • the third quadrant is a quadrant including a portion of the lower and left corners, and the reference region is on the third quadrant.
  • the sensor module 10 is installed at a position corresponding to the reference area existing on the third quadrant, it is possible to more accurately detect the amount of frost formed on the evaporator 8.
  • the upper and lower heights (H) and left and right widths (W) of the region (A) in which the evaporator (8) is disposed may be determined by using the point at which the lower and left edges intersect as the origin. have.
  • the reference region in the TA region to more accurately detect the amount of frost formed on the evaporator 8 referring to FIG. 7, when the reference region is present in the TA region And, the case where the reference area is present in a predetermined area (CA area) in the first quadrant is as follows.
  • the graph shown in FIG. 7 shows the actual measured data value, the horizontal axis represents the cooling operation time (t), the vertical axis represents the sensor output (V), and the sensor output (V) is the evaporator (8). ), the smaller the amount of frost formation on frost frost.
  • the reference region is present in the CA region, which is a region in which the flow velocity U of the air passing through the evaporator 8 is relatively slow, implantation growth of frost occurs rapidly in the early stage of cooling operation, but implantation growth of frost occurs after that. You can see that it is stagnant.
  • the reference region is present in the TA region, which is a relatively fast flow rate U of the air passing through the evaporator 8, it can be confirmed that frost-grown growth is continuously performed between cooling operations.
  • the cooling operation time is close to 2.5 hr, it is confirmed that the difference in the output (V) of the sensor of 0.5 V occurs compared to the case where the reference region exists in the CA region (that is, as much as the frost frost amount corresponding to 0.5 V). Means that it can detect more).
  • the presence of the reference region in the TA region can continuously detect the amount of frost formed by the sensor module 10 without being affected by the cooling operation time. It can be seen that it is advantageous to more accurately detect the amount of frost formation in frost frost (8).
  • frost when frost is formed on the sensor 33, the function of the sensor 33 that detects the amount of frost formed on the evaporator 8 may be reduced, so it is necessary to periodically remove the frost formed on the sensor 33. There is.
  • the sensing unit 30 may include heating elements 37 and 38 that remove the frost formed on the sensor 33 by generating heat when a predetermined current flows. Frost generated on the sensor 33 may be removed by heat generated from the heating elements 37 and 38.
  • the heating element 37 may be a plurality of heating elements arranged at a predetermined distance from the sensor 33 to surround the sensor 33. Thereby, frost frosted on the sensor 33 can be effectively removed.
  • the sensor 33 and the heating elements 37 and 38 may be disposed on the base 31 of the sensing unit 30.
  • the base 31 may be formed of a material having a high thermal conductivity, thereby facilitating heat transfer from the heating elements 37 and 38 to the sensor 33 on the base 31 to effectively remove frost frosting on the sensor 33. have.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

La présente invention concerne un refroidisseur unitaire comprenant : un évaporateur relié à un condenseur et comprenant un tuyau de fluide de refroidissement ayant un trajet d'écoulement dans lequel s'écoule un fluide de refroidissement; un ventilateur intérieur pour amener l'écoulement d'air passant à travers l'évaporateur; un module de capteur pour détecter la quantité de tartre de givre sur l'évaporateur; et une unité de commande pour effectuer une commande de telle sorte que l'indice de givre sur l'évaporateur soit retiré, lorsque la quantité de givre détectée par le module de capteur est égale à une valeur de référence ou supérieure. Le module de capteur est disposé à un emplacement correspondant à une région (ci-après, région de référence) dans laquelle le débit d'air traversant l'évaporateur est relativement rapide dans une région dans laquelle l'évaporateur est disposé.
PCT/KR2020/000866 2019-01-18 2020-01-17 Refroidisseur unitaire WO2020149700A1 (fr)

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KR10-2019-0006767 2019-01-18

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