WO2007135815A1 - 冷却貯蔵庫及びその運転方法 - Google Patents
冷却貯蔵庫及びその運転方法 Download PDFInfo
- Publication number
- WO2007135815A1 WO2007135815A1 PCT/JP2007/057897 JP2007057897W WO2007135815A1 WO 2007135815 A1 WO2007135815 A1 WO 2007135815A1 JP 2007057897 W JP2007057897 W JP 2007057897W WO 2007135815 A1 WO2007135815 A1 WO 2007135815A1
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- WO
- WIPO (PCT)
- Prior art keywords
- physical quantity
- cooling
- target
- change
- inverter compressor
- Prior art date
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Classifications
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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
- 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
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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
- 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
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/067—Evaporator fan units
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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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
- 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
- F25D2317/06—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 with forced air circulation
- F25D2317/065—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 with forced air circulation characterised by the air return
- F25D2317/0655—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 with forced air circulation characterised by the air return through the top
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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
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/14—Refrigerator multi units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a cooling storage unit including an inverter compressor and an operation method thereof.
- Patent Document 1 the applicant of the present application has proposed an operation method as shown in Patent Document 1. This is because the rotation speed of the inverter compressor is variable over a plurality of stages, and in the storage means, the cooling characteristics indicating the change over time of the target drop in the internal temperature are stored in advance as data. At each sampling time, the target temperature drop based on the cooling characteristics is compared with the actual temperature drop calculated based on the value detected by the temperature sensor. If the temperature drop is less than the target temperature drop, the inverter compressor speed is increased by one step. If the actual temperature drop is greater than the target temperature drop, the inverter compressor The rotation speed is reduced by one step. As a result, the internal temperature is controlled so as to drop following the previously stored cooling characteristics.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-121341
- the inverter compressor's set speed force can be switched between 6 stages from ⁇ speed to 6-speed.
- the rotational speed of each set speed (r / se rotational speed per second) is, for example, 25 to 75 (r / sec). It was set to be equal to (r / sec).
- the present invention has been completed based on the above circumstances, and an object thereof is to perform stable cooling control.
- the operation method of the cooling storage according to the present invention is such that the compressor power provided in the cooling device for cooling the inside of the refrigerator is an inverter compressor having a variable number of rotations over a plurality of stages, and the target temperature of the inside of the warehouse is set.
- a cooling characteristic indicating a change over time of a predetermined physical quantity corresponding to a temporal drop is stored in advance as data, the physical quantity is detected at a predetermined sampling time, and the physical quantity becomes a target based on the detected value.
- the rotation speed of each stage of the inverter compressor It is characterized by the fact that the difference in rotational speed between adjacent stages is gradually increased as the rotational speed increases.
- the cooling storage of the present invention is a cooling storage in which the inside of the storage is cooled by a cooling device such as a compressor and a cooler, and the compressor is an inverter compressor having a variable number of rotations over a plurality of stages.
- a storage means in which a cooling characteristic indicating a change over time of a predetermined physical quantity corresponding to a time-dependent drop in the interior temperature as a target is stored as data, a physical quantity sensor for detecting the physical quantity, A physical quantity change degree calculation unit that calculates the degree of change of the physical quantity based on the signal of the physical quantity sensor every predetermined sampling time, and the sampling time based on the cooling characteristic stored in the storage means every sampling time.
- a target physical quantity change output unit that outputs a target change degree in the physical quantity, an actual physical quantity change degree calculated by the physical quantity change degree calculator, and the target physical quantity
- a comparison unit that compares the target physical quantity change output from the quantity change output unit, and based on the comparison result of the comparison unit, the actual physical quantity change is smaller than the target physical quantity change
- the rotational speed of the inverter compressor is increased by one step, and when the actual change in physical quantity is larger than the target change in physical quantity, the rotational speed of the inverter compressor is decreased by one step.
- the number of revolutions of each stage of the inverter compressor is set such that the difference in the number of revolutions between adjacent stages gradually increases as the number of revolutions increases.
- the physical quantity change degree is defined as a change quantity of the physical quantity per unit time. The same is true for the following configurations.
- the rotational speed at each stage of the inverter compressor is set so that the difference in rotational speed between adjacent stages gradually increases as the rotational speed increases. This is based on the knowledge that, for example, if the difference in rotation speed between adjacent stages is equal, the higher the rotation speed, the less the degree of cooling capacity increases between stages. In anticipation of an increase in cooling capacity, the difference in rotational speed between adjacent stages is gradually increased as the rotational speed increases. As a result, regardless of the rotational speed, the degree to which the cooling capacity increases between the respective stages can be made substantially the same.
- inverter compression is used so that the physical quantity changes according to the target cooling characteristics.
- the amount of change in the cooling capacity can be made almost the same, so that there is no excess or deficiency in the cooling capacity, that is, the slowing down of the cooling speed is minimized. Therefore, it is possible to stably perform control for changing the physical quantity in accordance with a predetermined cooling characteristic.
- the cooling characteristic is represented by a linear function of a physical quantity for one hour, and the target physical quantity change degree output unit outputs the target physical quantity change degree as a constant value.
- the target physical quantity change is constant regardless of the passage of time, and each calculation is not required, so the control system is simplified.
- the cooling characteristic is represented by a quadratic function for a physical quantity temporarily, and the target physical quantity change degree output unit calculates a physical quantity change degree in the physical quantity based on the quadratic function at each sampling time. And a function of outputting the calculated value as the target physical quantity change degree.
- the cooling characteristics are formed by a quadratic function of the physical quantity for a time, and at each sampling time, the quadratic function force is also calculated as the amount of change of the physical quantity per unit time in the physical quantity at that time. Is done.
- a reference table in which a physical quantity is compared with a target physical quantity change degree based on the cooling characteristics is created in advance, and the target physical quantity change output unit outputs the reference table force at each sampling time. It has a function to search and output the target physical quantity change corresponding to the physical quantity. In this configuration, for each sampling time, a target physical quantity change degree in the physical quantity at that time is searched and output from a reference table created in advance. In order to obtain the target physical quantity change degree, it is not necessary to perform calculations simply by referring to the reference table, so the control speed can be increased accordingly.
- a program for changing the rotational speed of the inverter compressor so as to change the physical quantity in accordance with a predetermined cooling characteristic is provided with a plurality of types having different cooling characteristics, etc. It is stored in a control means attached to the cooling device so that it can be selectively executed.
- the ideal cooling mode during pull-down cooling or control cooling may differ depending on conditions such as installation location, frequency of opening and closing doors, and the type of food to be stored. Therefore, during each cooling If multiple types of programs with different characteristics are prepared and are selectively executed according to the use conditions, it is possible to perform optimal cooling according to the use conditions.
- FIG. 1 is a perspective view of a refrigerator-freezer according to Embodiment 1 of the present invention.
- FIG.6 A graph comparing the temperature characteristics in the refrigerator between the refrigerated side and the refrigerated side
- FIG. 9 is a flowchart showing the control operation of the inverter compressor in the pull-down area.
- FIG. 10 is a flowchart showing the control operation of the inverter compressor in the control area.
- FIG. 11 is a graph showing cooling characteristics according to Embodiment 2.
- FIG. 12 is a flowchart showing the control operation of the inverter compressor.
- FIG. 13 is a view showing a reference table based on pull-down cooling characteristics according to the third embodiment.
- FIG. 15 is a flowchart showing the control operation of the inverter compressor.
- FIG. 16 Table showing the relationship between the inverter compressor set speed and the rotational speed in the conventional example.
- FIG. 17 Graph showing the relationship between the inverter compressor rotational speed and the cooling capacity.
- Cooling unit Cooling device 23 ⁇ ⁇ ⁇ Inverter compressor 26 ... Cooler 40 ⁇ "Control unit (control means) 41 ⁇ ⁇ ⁇ Internal temperature sensor (physical quantity sensor) 43 ... Data storage unit (Memory means) 45 ⁇ ⁇ ⁇ Inverter circuit xp ... ideal curve (pull-down cooling characteristics) xc, xcl ... reason Ideal curve (control cooling characteristics) Sp, Sc ... Actual temperature drop ⁇ , ⁇ 2 ⁇ Target temperature drop (pull-down cooling) Ac, Acl, Ac2... Target temperature drop (control cooling)
- Embodiment 1 of the present invention will be described with reference to FIGS.
- the refrigerator-freezer is a four-door type, and as shown in Fig. 1, it is equipped with a main body 10 that also has a heat insulating box body with a front opening, and this front opening is partitioned by a cross-shaped partition frame into four pieces.
- the entrance 11 is formed and the interior space of approximately 1Z4 corresponding to the entrance 11 in the upper right part when viewed from the front is partitioned by a heat insulating partition wall into a freezer compartment 14, and the remaining approximately 3Z4
- the area is a refrigerator compartment 13.
- Each doorway 11 is fitted with a heat insulating door 15 so that it can swing open and close.
- a machine room 18 is configured by, for example, a panel 17 (see FIG. 3) standing around.
- a rectangular opening 19 having the same size is formed on the upper surface of the main body 10 which is the bottom surface of the machine room 18, corresponding to the ceiling wall of the refrigerator compartment 13 and the ceiling wall of the freezer compartment 14. Yes.
- a cooling unit 20 is individually attached to each opening 19.
- the compressor 23, the condenser 24 with the condenser fan 24A, the capillary tube 25, and the cooler 26 (evaporator) are connected in a circulating manner by refrigerant piping.
- the refrigeration circuit 21 is configured.
- a heat insulating unit base 28 is provided so as to cover the opening 19 and the cooler 26 among the constituent members of the cooling unit 20 is on the lower surface side of the unit base 28 and the other constituent members are on the upper surface side. Installed.
- a drain pan 30 that also serves as a cooling duct is stretched downward on the ceiling of the refrigerator compartment 13 and the freezer compartment 14 so as to A cooler chamber 31 is formed between them.
- a suction port 33 is provided on the upper side of the drain pan 30, and a cooler fan is provided. 32 is equipped, and a discharge port 34 is formed on the lower side.
- the cooling unit 20 and the cooler fan 32 are driven, the air in the refrigerator compartment 13 (freezer compartment 14) flows from the suction port 33 to the cooler compartment as shown by the arrow in the figure.
- the cold air generated by heat exchange while passing through the cooler 26 is circulated in such a manner that it is blown from the discharge port 34 to the refrigerator compartment 13 (freezer compartment 14).
- the inside of the (freezing chamber 14) is cooled.
- the cooling units 20 respectively mounted in the refrigerator compartment 13 and the freezer compartment 14 are shared.
- the cooling capacity of the cooling unit 20 is determined by the capacity of the compressor 23, the required cooling capacity varies depending on conditions such as refrigeration and freezing, or the size of the internal volume of the refrigerator 23.
- An inverter compressor 23 (hereinafter referred to as the compressor 23 as appropriate) having the maximum required capacity and capable of controlling the rotation speed is used.
- the capillary tube 25 is also used in common, and a detailed description is omitted.
- a tube having an intermediate flow rate characteristic between refrigeration and freezing is used.
- the cooling unit 20 is structurally shared for refrigeration and refrigeration, while operation control is performed individually. This is because, when the cooling unit 20 is made common, the temperature characteristics during pull-down cooling, for example, may vary greatly depending on conditions such as refrigeration, freezing, or the size of the heat insulation box (internal volume). Based on perceptions.
- the performance test during pull-down cooling is indispensable.
- the cooling rate largely depends on the heat insulation box. Therefore, for this performance test, the cooling unit 20 and it are installed. It is necessary to do this in combination with a heat insulating box. Therefore, there is a problem that the complexity of the performance test cannot be eliminated even if the corner cooling unit 20 is used in common.
- means for controlling the temperature of the inside of the warehouse that does not depend on the heat insulation box along a predetermined temperature curve during pull-down cooling.
- the inverter compressor 23 is provided.
- the following advantages can be obtained. This is because when the control cooling is performed so that the speed (rotation speed) of the inverter compressor 23 is gradually reduced near the set temperature, the temperature drop becomes extremely slow.
- the on-time is overwhelmingly long, in other words, the number of on / off switching of the compressor 23 is greatly reduced, and it is operated at a low speed, leading to higher efficiency and energy saving. .
- a control unit 40 that includes a microcomputer or the like and executes a predetermined program is provided, and the electrical equipment provided on the upper surface of the unit base 28 on which the cooling unit 20 is mounted. Stored in box 29.
- An internal temperature sensor 41 for detecting the internal temperature is connected to the input side of the control unit 40.
- the control unit 40 is provided with a data storage unit 43 along with the clock signal generation unit 42.
- a straight line xp of a linear function is selected and stored in the data storage unit 43 as an ideal temperature curve during pull-down cooling.
- the target temperature drop degree (temperature drop per unit time: ⁇ / At) becomes a constant value Ap regardless of the temperature inside the box.
- the data storage unit 43 also stores an ideal temperature curve during control cooling.
- this temperature curve is set as a straight line xc with a gentler gradient than the ideal curve (straight line xp) during pull-down cooling.
- the target internal temperature drop Ac is constant, but is smaller than the target temperature drop Ap of the ideal curve xp.
- an operation program Py for controlling the drive of the inverter compressor 23 so as to follow the temperature characteristic Y in the figure is required.
- each cooling unit 20 is provided with the electrical box 29 and is provided with a control unit 40, which stores both the refrigeration program Px and the refrigeration program Py with the ideal curve data of each of them. Has been.
- an inverter compressor 23 is connected to the output side of the control unit 40 via an inverter circuit 45.
- the set speed of inverter compressor 23 can be switched between 6 speeds, 1st to 6th, and the relationship between each set speed and rotation speed (r / sec: rotation speed per second) is shown in the figure. As shown in Fig. 7, “25”, “30”, “37”, “47”, “60” and “75” are applied from the 1st to the 6th.
- the difference in rotation speed (r / sec) between adjacent stages (set speed) is ⁇ 5 '', ⁇ 7 '', ⁇ 10 '', ⁇ 13 '' and ⁇ 15 '', That is, the rotational speed of each stage is set such that the difference in rotational speed between adjacent stages gradually increases as the rotational speed increases.
- the main body 10 made of a heat-insulated box and two common cooling units 20 are divided and loaded, and are respectively installed in the openings 19 in the ceiling of the refrigerator compartment 13 and the freezer compartment 14.
- the set temperature inside the refrigerator compartment 13 and the freezer compartment 14 is inputted respectively, and the control attached to the cooling unit 20 attached to the refrigerator compartment 13 side by a switch (not shown) provided in the electrical box 29, etc.
- Part 40 selects the refrigeration program Px,
- the control unit 40 attached to the cooling unit 20 attached to the freezer compartment 14 side the freezing program Py is selected.
- the refrigerator compartment 13 and the freezer compartment 14 are controlled to be cooled based on the individual operation programs Px and Py.
- the refrigerator compartment 13 will be described.
- the pull-down control is started when the internal temperature exceeds the set temperature by a predetermined value or more, and the internal temperature is detected every predetermined sampling time.
- the actual temperature drop Sp is calculated based on the detected internal temperature, and this calculated value Sp is the target value read from the data storage unit 43.
- Ap —definite
- the calculated value Sp is less than or equal to the target value Ap
- the number of revolutions of the inverter compressor 23 is increased by one step via the inverter circuit 45.
- the compressor 23 The number of revolutions is reduced by one step, and this is repeated every predetermined sampling time, and pulled down to follow the ideal curve (straight line xp) shown in FIG.
- the control shifts to control.
- the control operation of the control cooling is basically the same as that during pull-down cooling, and as a result, as shown in Fig. 10, the internal temperature is detected at each predetermined sampling time, and the detected internal temperature is detected. Based on this, the actual temperature drop Sc in the cabinet is calculated.
- This calculated value Sc is compared with the target value Ac (—determined) of the temperature drop in the chamber on the ideal temperature curve xc, and if the calculated value Sc is less than or equal to the target value Ac, the rotational speed of the inverter compressor 23 If the calculated value Sc is larger than the target value Ac, the rotation speed of the compressor 23 is decreased by one step, and this is repeated at a predetermined sampling time, resulting in an ideal curve (straight line xc). Along the way, the temperature drops slowly. When the internal temperature falls to the lower limit temperature Td, which is lower than the set temperature To by a predetermined value, the inverter compressor 23 is turned off, the internal temperature gradually starts to rise, and when the internal temperature returns to the upper limit temperature Tu, the temperature curve xc again. The temperature control is performed according to the above, and by repeating this, the inside of the cabinet is maintained at the set temperature To.
- the rotational speed of each stage of the inverter compressor 23 is set so that the rotational speed difference between adjacent stages gradually increases as the rotational speed increases. Therefore, regardless of the rotational speed, the degree to which the cooling capacity increases between the stages can be made substantially the same.
- the linear function lines xp and xc are selected as ideal temperature forces during pull-down cooling and control cooling, the target temperature drop Ap and Ac are the internal temperature. Regardless of this, it is constant and each calculation is not required, and the control system can be simplified.
- the ideal cooling mode during pull-down cooling or control cooling may differ depending on conditions such as installation location, frequency of opening and closing the door 15 and the type of food stored. is there. Therefore, by preparing multiple types of programs with different characteristics at the time of cooling and selectively executing them according to the usage conditions, it is possible to perform optimal cooling according to the usage conditions.
- the target temperature drop is not constant but varies depending on the internal temperature, so a calculation unit is provided to calculate it.
- the above-mentioned quadratic function curve xcl force The temperature drop amount per unit time at the internal temperature at that time ( ⁇ ⁇ ⁇ ⁇ is the target temperature drop degree Acl Is calculated and output.
- the temperature drop Acl may be obtained as a derivative (dTZdt) of the quadratic function curve xcl at the internal temperature.
- the actual temperature drop Sc is calculated based on the detected internal temperature at each sampling time.
- the calculation unit uses a quadratic function curve xcl force and the internal temperature at that time.
- the target temperature drop Acl at is calculated. This calculated target value Acl ⁇ is compared with the actual temperature drop Sc, and if the actual temperature drop Sc is less than or equal to the target value Acl, the inverter compressor 23 is increased by one step and Decelerated in stages and controlled cooling is performed along the ideal curve (quadratic function curve xcl).
- the ideal temperature curve during pull-down cooling may be a quadratic function curve.
- the degree of increase in the cooling capacity between the stages can be made substantially the same regardless of the rotational speed of the inverter compressor 23, so that the actual temperature drop is the target temperature.
- the amount of change in the cooling capacity can be made almost the same, and the cooling capacity Therefore, it is possible to suppress the slowing of the cooling rate to the minimum without causing excess or deficiency, and to stably perform the control for lowering the internal temperature in accordance with the predetermined cooling characteristics. Since it is only necessary to change the setting of the rotational speed of the inverter compressor 23, it is possible to easily cope with the force.
- Embodiment 3 of the present invention based on the ideal pull-down cooling characteristic, the target temperature drop Ap2 corresponding to the internal temperature is calculated in advance, and as shown in FIG. A reference table is created in advance to contrast degree Ap2.
- ideal control cooling characteristics Based on this, the target temperature drop Ac2 corresponding to the internal temperature is calculated in advance, and a reference table that compares the internal temperature and the target temperature drop Ac2 is created in advance as shown in FIG. .
- the temperature of the reference table is set at a temperature that can be used as a control cooling area. Both reference tables are stored in the data storage unit 43.
- V Same as Form 1.
- the operation of the third embodiment is as follows.
- pull-down control is started, the internal temperature is detected at every predetermined sampling time.
- the actual temperature drop Sp is calculated based on the detected temperature, and the reference table force is the target temperature drop Ap2 at the current temperature Ap2. Is searched and output.
- This output target value Ap2 force is compared with the actual temperature drop Sp, and if the actual temperature drop Sp is less than or equal to the target value Ap2, the inverter compressor 23 is increased by one step, and vice versa.
- pull-down cooling is performed in line with the ideal pull-down cooling characteristics. After that, control operation is performed.
- the internal temperature is detected every predetermined sampling time.
- the actual chamber temperature drop Sc is calculated based on the detected chamber temperature, along with the reference table force Target temperature drop Ac2 at the current chamber temperature Ac2 Is retrieved and output.
- This output target value A c2 ⁇ is compared with the actual temperature drop Sc, and if the actual temperature drop Sc is less than or equal to the target value Ac2, the inverter compressor 23 is accelerated by one step, and vice versa.
- control cooling is performed so as to follow ideal control cooling characteristics (for example, approximate quadratic function). The same can be done on the freezer side.
- the degree of increase in the cooling capacity between the stages can be made almost the same regardless of the rotational speed of the inverter compressor 23, so that the actual temperature drop is the target.
- the amount of change in the cooling capacity can be made approximately the same when controlling the inverter compressor 23 to increase or decrease the rotation speed step by step. Does not cause excess or deficiency in cooling capacity, that is, slows down the cooling rate to a minimum It is possible to suppress the temperature in the chamber according to the predetermined cooling characteristic and to stably perform control.
- the load force can be easily dealt with simply by changing the rotational speed setting of the inverter compressor 23.
- the number of stages of the set speed of the inverter compressor and the number of revolutions of each stage are not limited to those exemplified in the above embodiment, and the number of stages is arbitrary, and the number of revolutions is basically between each stage. It is sufficient that the rotation speed is such that the degree of increase in the cooling capacity can be made substantially the same.
- the cooling characteristics to be copied are exemplified by the manner in which the internal temperature changes with time, but other measures such as the cooling device side scale, for example, the low pressure of the refrigerant and the evaporation temperature, etc. Other physical quantities may be changed over time.
- the physical quantity may increase with time so as to be inversely proportional to the drop in the internal temperature.
- the present invention is also of a type in which the internal temperature itself is compared at each sampling time, and based on the comparison, the number of revolutions of the inverter compressor is increased or decreased by one step. Can be applied as well.
- the present invention is not limited to the case where the cooling unit exemplified in the above embodiment is shared for refrigeration and freezing, but can also be applied to the case where the cooling unit is dedicated to refrigeration or freezing.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP07741333.4A EP2110626B1 (en) | 2006-05-19 | 2007-04-10 | Cooling storage and method of operating the same |
US12/227,160 US7908039B2 (en) | 2006-05-19 | 2007-04-10 | Cooling storage cabinet and method of operating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-140301 | 2006-05-19 | ||
JP2006140301A JP5027443B2 (ja) | 2006-05-19 | 2006-05-19 | 冷却貯蔵庫 |
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WO2007135815A1 true WO2007135815A1 (ja) | 2007-11-29 |
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PCT/JP2007/057897 WO2007135815A1 (ja) | 2006-05-19 | 2007-04-10 | 冷却貯蔵庫及びその運転方法 |
Country Status (6)
Country | Link |
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US (1) | US7908039B2 (ja) |
EP (1) | EP2110626B1 (ja) |
JP (1) | JP5027443B2 (ja) |
CN (1) | CN101449121A (ja) |
TW (1) | TW200801417A (ja) |
WO (1) | WO2007135815A1 (ja) |
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US20100106303A1 (en) * | 2008-10-24 | 2010-04-29 | Ole Thogersen | Control of pull-down in refrigeration systems |
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CN102449408B (zh) * | 2009-05-29 | 2014-07-30 | 大金工业株式会社 | 空调装置 |
KR101705528B1 (ko) * | 2010-07-29 | 2017-02-22 | 엘지전자 주식회사 | 냉장고 및 냉장고 제어 방법 |
DE102010052699A1 (de) * | 2010-11-26 | 2012-05-31 | Liebherr-Hausgeräte Ochsenhausen GmbH | Verfahren zum Betrieb eines Kühl- und/oder Gefriergeräts und Kühl- und/oder Gefriergerät |
TW201322902A (zh) * | 2011-11-24 | 2013-06-01 | Hon Hai Prec Ind Co Ltd | 集裝箱式資料中心裝置 |
US9140477B2 (en) * | 2012-05-21 | 2015-09-22 | Whirlpool Corporation | Synchronous compartment temperature control and apparatus for refrigeration with reduced energy consumption |
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Also Published As
Publication number | Publication date |
---|---|
US7908039B2 (en) | 2011-03-15 |
EP2110626A1 (en) | 2009-10-21 |
JP5027443B2 (ja) | 2012-09-19 |
JP2007309603A (ja) | 2007-11-29 |
EP2110626A4 (en) | 2010-07-28 |
US20090105884A1 (en) | 2009-04-23 |
TW200801417A (en) | 2008-01-01 |
CN101449121A (zh) | 2009-06-03 |
TWI377328B (ja) | 2012-11-21 |
EP2110626B1 (en) | 2016-11-02 |
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