CN111356881A - Air conditioner, control method for air conditioner, and program - Google Patents

Air conditioner, control method for air conditioner, and program Download PDF

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Publication number
CN111356881A
CN111356881A CN201880003390.4A CN201880003390A CN111356881A CN 111356881 A CN111356881 A CN 111356881A CN 201880003390 A CN201880003390 A CN 201880003390A CN 111356881 A CN111356881 A CN 111356881A
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CN
China
Prior art keywords
heat exchanger
indoor
air conditioner
indoor heat
fan
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Granted
Application number
CN201880003390.4A
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Chinese (zh)
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CN111356881B (en
Inventor
毛塚烈将
田口孝
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Hitachi Johnson Controls Air Conditioning Inc
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Hitachi Johnson Controls Air Conditioning Inc
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Publication of CN111356881A publication Critical patent/CN111356881A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/22—Cleaning ducts or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/20—Safety or protection arrangements; Arrangements for preventing malfunction for preventing development of microorganisms

Abstract

The heat exchanger of the air conditioner can be appropriately cleaned in the cleaning operation. To this end, the air conditioner includes a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger, and a control device and an indoor fan for controlling the refrigeration cycle so as to perform a cleaning operation for cleaning a surface of the indoor heat exchanger, wherein the control device includes: performing a freezing control function for causing the surface temperature of the indoor heat exchanger to be below freezing point while the indoor heat exchanger is functioning as an evaporator during the cleaning operation (S130, S132, S134); and a function (S130, S132, S134) for driving the indoor fan for a predetermined period shorter than the execution period of the freezing control during execution of the freezing control and for bringing the indoor fan to a stop state for a period other than the predetermined period.

Description

Air conditioner, control method for air conditioner, and program
Technical Field
The invention relates to an air conditioner, a control method of the air conditioner and a program.
Background
As for the cleaning operation of the air conditioner, "the air conditioner includes a refrigeration cycle having a heat exchanger for cooling or heating ambient air, and a control device 130 for controlling the refrigeration cycle so as to perform a cleaning operation for cleaning the surface of the heat exchanger while performing a heating operation, a cooling operation, a dehumidifying operation, and the like (see the abstract), as described in patent document 1 below.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 6296633
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, the contents of driving the fan of the indoor unit or the like during the cleaning operation are not particularly described. However, if the driving state of the fan of the indoor unit or the like is not appropriate, the heat exchanger cannot be properly cleaned.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an air conditioner, a method of controlling the air conditioner, and a program that can appropriately clean a heat exchanger during a cleaning operation.
Means for solving the problems
In order to solve the above problems, an air conditioner according to the present invention includes a refrigeration cycle including a compressor for compressing a refrigerant and an indoor heat exchanger for cooling or heating air in an air conditioner room, a control device for controlling the refrigeration cycle so as to perform a cleaning operation for cleaning a surface of the indoor heat exchanger, and an indoor fan for blowing air to the indoor heat exchanger, wherein the control device includes: a function of performing freezing control for causing a surface temperature of the indoor heat exchanger to be below a freezing point, while the indoor heat exchanger functions as an evaporator in performing the cleaning operation; and a function of driving the indoor fan in a time equal to or less than half of an execution period of the freezing control during execution of the freezing control.
Effects of the invention
According to the present invention, the heat exchanger can be appropriately cleaned during the cleaning operation.
Drawings
Fig. 1 is a system diagram of an air conditioner 100 according to a first embodiment of the present invention.
Fig. 2 is a side sectional view of the indoor unit according to the first embodiment.
FIG. 3 is a flowchart of a cleaning operation processing routine in the first embodiment
Fig. 4 is a diagram showing an example of a moisture intake amount chart.
Fig. 5 is a diagram showing an example of the relationship between the room temperature and the estimated relative humidity value in the second embodiment.
Detailed Description
[ first embodiment ]
< Structure of air conditioner
Fig. 1 is a system diagram of an air conditioner 100 according to a first embodiment of the present invention.
The air conditioner 100 includes an outdoor unit 30, an indoor unit 60, and a control device 20 for controlling these units. The indoor unit 60 sets an operation mode (cooling, heating, dehumidification, ventilation, etc.), an indoor air volume (fast wind, strong wind, weak wind, etc.), a target indoor temperature, and the like, based on a signal input from the remote control 90.
(control device 20)
The control device 20 includes hardware of a general-purpose computer such as a CPU (central Processing unit), a dsp (digital signal processor), a ram (random Access memory), and a ROM (read Only memory), and stores a control program executed by the CPU and various data in the ROM. The control device 20 controls the outdoor unit 30 and each unit of the indoor unit 60 based on a control program. The details of which will be described later.
(outdoor unit 30)
The outdoor unit 30 includes a compressor 32, a four-way valve 34, and an outdoor heat exchanger 36. The compressor 32 includes a motor 32a and has a function of compressing the refrigerant flowing in through the four-way valve 34. The pipe a1 is provided with a suction-side temperature sensor 41 for detecting the temperature of the refrigerant sucked by the compressor 32, and a suction-side pressure sensor 45 for detecting the pressure of the refrigerant sucked by the compressor 32. The pipe a2 is provided with a discharge side temperature sensor 42 that detects the temperature of the refrigerant discharged from the compressor 32, and a discharge side pressure sensor 46 that detects the pressure of the refrigerant discharged from the compressor 32. Further, a compressor temperature sensor 43 that detects the temperature of the compressor 32 is attached to the compressor 32.
The four-way valve 34 has a function of switching the direction of the refrigerant supplied to the indoor unit 60 depending on whether the indoor heat exchanger 64 functions as an evaporator or a condenser. When the indoor heat exchanger 64 functions as an evaporator, for example, during a cooling operation, the four-way valve 34 switches so as to connect the pipes a2 and a3 to each other and to connect the pipes a1 and a6 to each other along the solid-line path. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor 32 is cooled by the outdoor heat exchanger 36. The cooled refrigerant is supplied to the indoor unit 60 through the pipe a 5.
When the indoor heat exchanger 64 functions as a condenser, for example, during a heating operation, the four-way valve 34 is switched so as to connect the pipes a2 and a6 and connect the pipes a1 and a3 along the broken-line path. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor 32 is supplied to the indoor unit 60 through the pipes a2 and a 6. The outdoor fan 48 includes a motor 48a and blows air to the outdoor heat exchanger 36.
The outdoor heat exchanger 36 is a heat exchanger that performs heat exchange between the refrigerant and the air sent from the outdoor fan 48, and is connected to the compressor 32 via the four-way valve 34. The outdoor unit 30 is provided with an outdoor heat exchanger inlet temperature sensor 51 (outside air temperature sensor) for detecting the temperature of the air flowing into the outdoor heat exchanger 36, an outdoor heat exchanger refrigerant gas temperature sensor 53 for detecting the temperature of the gas side refrigerant of the outdoor heat exchanger 36, and an outdoor heat exchanger refrigerant liquid temperature sensor 55 for detecting the temperature of the liquid side refrigerant of the outdoor heat exchanger 36.
The power supply unit 54 receives a three-phase ac voltage from the commercial power supply 22. The power measuring unit 58 is connected to the power supply unit 54, thereby measuring the power consumption of the air conditioner 100. The dc voltage output from the power supply unit 54 is supplied to the motor control unit 56. The motor controller 56 includes an exchanger (not shown) and supplies an ac voltage to the motor 32a of the compressor 32 and the motor 48a of the outdoor fan 48. The motor control unit 56 controls the motors 32a and 48a by sensor responses, thereby detecting the rotational speeds of the motors 32a and 48 a.
(indoor machine 60)
The indoor unit 60 includes an indoor expansion valve 62, an indoor heat exchanger 64, an indoor fan 66, a motor control unit 67, and a remote control communication unit 68 that performs bidirectional communication with a remote control 90 (operation unit). The indoor fan 66 includes a motor 66a and blows air to the indoor heat exchanger 64. The motor control unit 67 includes an inverter (not shown) and supplies an ac voltage to the motor 66 a. The motor controller 67 responds and controls the motor 66a with a sensor, thereby detecting the rotation speed of the motor 66 a.
The indoor expansion valve 62 is inserted between the pipes a5 and a7, and has a function of adjusting the flow rate of the refrigerant flowing through the pipes a5 and a7 and decompressing the refrigerant on the secondary side of the indoor expansion valve 62. The indoor heat exchanger 64 is a heat exchanger that performs heat exchange between the indoor air sent from the indoor fan 66 and the refrigerant, and is connected to the indoor expansion valve 62 through a pipe a 7.
The indoor unit 60 includes an indoor heat exchanger inlet air temperature sensor 70 (temperature sensor), an indoor heat exchanger discharge air temperature sensor 72, an indoor heat exchanger inlet humidity sensor 74 (temperature sensor), an indoor heat exchanger refrigerant liquid temperature sensor 25, and an indoor heat exchanger refrigerant gas temperature sensor 26. Here, the indoor heat exchanger inlet air temperature sensor 70 detects the temperature of the air taken in by the indoor fan 66. In addition, the indoor heat exchanger discharge air temperature sensor 72 detects the temperature of the air discharged from the indoor heat exchanger 64.
In addition, the indoor heat exchanger inlet temperature sensor 74 detects the humidity of the air taken in by the indoor fan 66. The indoor heat exchanger refrigerant liquid temperature sensor 25 and the indoor heat exchanger refrigerant gas temperature sensor 26 are provided at a connection point between the indoor heat exchanger 64 and the pipe a6, and detect the temperature of the refrigerant flowing therethrough. In this way, the compressor 32, the four-way valve 34, the outdoor heat exchanger 36, the indoor expansion valve 62, the indoor heat exchanger 64, and the pipes a1 to a7 form a refrigeration cycle RC.
Fig. 2 is a side sectional view of the indoor unit 60. The indoor unit 60 is a model called "ceiling embedded type" which is embedded in the ceiling 130 and exposes the lower surface thereof to the air-conditioning room.
In fig. 2, the indoor heat exchanger 64 is formed in a plate shape bent in a substantially V-shape, and is provided at the center of the indoor unit 60. The indoor fan 66 has fins arranged in a substantially cylindrical shape and is disposed in front of the indoor heat exchanger 64. A water receiving tray 140 that receives condensed water is disposed below the indoor heat exchanger 64 and the indoor fan 66.
An inclined air filter 142 is provided behind the indoor heat exchanger 64. The lower surface of the indoor unit 60 is covered with a decorative panel 143. An air inlet 144 formed by cutting a slit in the decorative plate 143 is formed below the air filter 142. The indoor heat exchanger inlet air temperature sensor 70 is disposed between the indoor heat exchanger 64 and the air filter 142.
An air blowing passage 146 is formed in front of the indoor fan 66. The horizontal air vanes 148 are provided midway in the air blowing path 146, and control the direction of the airflow in the horizontal direction (the direction perpendicular to the paper surface). The up-down wind direction plate 150 is provided at the outlet portion of the air blowing passage 146, and rotates about a fulcrum 150a to control the direction of the airflow in the up-down direction. The horizontal wind direction plate 148 and the vertical wind direction plate 150 are rotationally driven by the control device 20 (see fig. 1). The vertical vanes 150 shown by solid lines in fig. 2 are shown in the fully opened state.
When the air conditioner 100 is stopped, the up-down wind direction plate 150 rotates to the fully closed position 152 indicated by the one-dot chain line. When a cleaning operation described later is performed, the up-down wind direction plate 150 is rotated to a position 156 indicated by a one-dot chain line, and then rotated to a cleaning operation position 154. The larger the opening degree of the up-down wind direction plate 150, the smaller the duct resistance of the air blowing path 146. However, even when the up-down wind direction plate 150 is closed at the full close position 152, a gap FS is formed between the up-down wind direction plate 150 and the decorative plate 143, and a small amount of air flows through the gap FS.
< action of the first embodiment >
(outline of cleaning operation)
Next, the operation of the present embodiment will be described.
In the present embodiment, the "washing operation" is executed automatically or in response to a user instruction. Here, the "cleaning operation" is an operation of frosting or condensing the surface of the indoor heat exchanger 64, or cleaning the surface of the indoor heat exchanger 64 with the frosted or condensed water. In addition, the case where the washing operation is automatically executed is, for example, a case where the washing operation is periodically executed every predetermined time. The washing operation is classified into a "freeze washing operation" and a "dew condensation washing operation".
During the freeze cleaning operation, the controller 20 (see fig. 1) switches the four-way valve 34 in the direction indicated by the solid line so that the indoor heat exchanger 64 serves as an evaporator. Next, the controller 20 sets the states of the respective portions of the air conditioner 100 such as the rotation speed of the compressor 32, the opening degree of the indoor expansion valve 62, and the rotation speed of the indoor fan 66 so that the surface temperature of the indoor heat exchanger 64 becomes below the freezing point. If this state continues, frost gradually forms on the surface of the indoor heat exchanger 64. Here, when the surface temperature of the indoor heat exchanger 64 is maintained below the freezing point and the indoor fan 66 is stopped, frost on the surface of the indoor heat exchanger 64 further grows.
Here, the rotation speed of the indoor fan 66 during the freeze-washing operation will be described. As described above, the user of the air conditioner 100 can set the indoor air volume (a sharp wind, a strong wind, a weak wind, etc.) by operating the remote control 90. However, the user can specify the minimum air volume that can be set by operating the remote control 90, and the user cannot set an air volume lower than the minimum air volume. The rotation speed in the minimum air volume that can be specified by the user is referred to as "user-specified minimum rotation speed".
On the other hand, in the freeze washing operation, when frost is formed on the surface of the indoor heat exchanger 64, the control device 20 specifies a predetermined "frost-formation-time rotation speed" as the rotation speed of the indoor fan 66. The frosting rotation speed is a rotation speed lower than the user-specified minimum rotation speed. The reason why such a low frosting rotation speed is applied is that the user feels as little discomfort as possible due to the suppression of cold air leaking into the air-conditioned room when the washing operation is performed.
Next, the controller 20 switches the four-way valve 34 (see fig. 1) in the direction indicated by the broken line so that the indoor heat exchanger 64 functions as a condenser, thereby heating the indoor heat exchanger 64. Then, the frost formed in the indoor heat exchanger 64 is melted, and the surface of the indoor heat exchanger 64 is washed. Then, the control device 20 stops the freezing cycle RC to continuously drive the indoor fan 66 for a predetermined time. Thereby, the surface of the indoor heat exchanger 64 is dried. Through the above process, the freeze cleaning operation is finished.
Next, the dew condensation cleaning operation will be described. Even during the dew condensation cleaning operation, the control device 20 (see fig. 1) switches the four-way valve 34 in the direction indicated by the solid line so that the indoor heat exchanger 64 serves as an evaporator. Next, the control unit 20 sets the states of the respective units of the air conditioner 100 so that the surface temperature of the indoor heat exchanger 64 is lower than the dew point temperature and higher than zero.
If this state continues, condensation forms on the surface of the indoor heat exchanger 64, and the condensed water washes the surface of the indoor heat exchanger 64. Then, the controller 20 switches the four-way valve 34 in the direction indicated by the broken line so that the indoor heat exchanger 64 becomes a condenser, heats the indoor heat exchanger 64, and continues to drive the indoor fan 66. Thereby, the surface of the indoor heat exchanger 64 is dried. Through the above process, the dew condensation cleaning operation is ended.
(operation by cleaning operation processing program)
Fig. 3 is a flowchart of a cleaning operation processing routine in the present embodiment.
In fig. 3, when the process proceeds to step S100, the control device 20 collects various data. That is, the indoor fan 66 is driven with the refrigeration cycle RC stopped, air in the air-conditioned room is taken into the indoor unit 60, and various data such as detection results of various sensors shown in fig. 1 are collected.
Hereinafter, the detection structure of the indoor heat exchanger inlet air temperature sensor 70, the detection result of the indoor heat exchanger inlet humidity sensor 74, and the detection result of the outdoor heat exchanger inlet temperature sensor 51 in the collected data are referred to as the room temperature T, the relative humidity H, and the outside air temperature TD, respectively. In step S100, the up-down wind deflector 150 (see fig. 2) is rotated to the position 156.
Next, when the process proceeds to step S102, the control device 20 selects a rotation type based on the collected data. Here, the selected rotation type is "freeze cleaning operation", "dew condensation cleaning operation", or "operation stop". If the freeze-washing operation is possible, it is preferable to perform the freeze-washing operation. However, when the relative humidity in the air-conditioning room is too low, a sufficient amount of frost cannot be accumulated in the indoor heat exchanger 64, and a sufficient cleaning effect cannot be obtained. Conversely, when the relative humidity H is too high, condensation occurs at a position other than the indoor heat exchanger 64 when the freeze-washing operation is performed.
A drain pipe, a drain pump, and the like (not shown) for discharging the condensed water are attached to the drain pan 140 (see fig. 2) of the indoor unit 60. If the temperature at which dew condensation water is generated is 0 ℃ or lower, there is a possibility that a drain pipe or the like is clogged at the position. Therefore, if the room temperature T or the outside air temperature TD is around 0 ℃, the cleaning operation is preferably stopped. If the room temperature T or the outside air temperature TD is high, the cooling capacity may not be ensured to such an extent that the indoor heat exchanger 64 can be sufficiently frosted.
Therefore, in this case, it is preferable to select the dew condensation cleaning operation instead of the freezing cleaning operation. If the room temperature T or the outside air temperature TD becomes higher, the cooling capacity may not be ensured to such an extent that the indoor heat exchanger 64 can be sufficiently condensed. In this case, the cleaning operation is preferably stopped. For the above reasons, in step S102, the control temperature 20 selects any one of the operation types of "freeze cleaning operation", "dew condensation cleaning operation", and "operation stop" based on the room temperature T, the outside air temperature TD, and the relative humidity H.
If "operation stop" is selected in step S102, the process proceeds to step S106, and operation stop processing is executed. Here, the indoor fan 66 is stopped, and the process of this routine is ended. When the "dew condensation cleaning operation" is selected in step S102, the process proceeds to step S104, and the dew condensation cleaning operation is executed. Here, the dew condensation cleaning operation described above is executed, and the processing of the present routine is ended.
If the "freeze cleaning operation" is selected in step S102, the process proceeds to step S110. Here, the treatment is branched based on the range of the relative humidity H. More specifically, the processing is branched based on the result of comparison of the relative humidity H with the constants LH, HH. The constant LH is, for example, about "40%", and the constant HH is, for example, about "60%".
In step S110, if the relative humidity H is "H ≦ LH", the process advances to step S130, and "freeze control F1" is executed. In addition, if the relative humidity H is in the range "LH < H ≦ HH", the process advances to step S132, and "freeze control F2" is executed. In addition, if the relative humidity H is in the range of "HH < H", the process advances to step S134 to execute "freeze control F3".
Details of these freezing controls F1, F2, and F3 will be described later, but in any of these controls, frost forms on the surface of the indoor heat exchanger 64. When steps S130, S132, and S134 are completed, the process proceeds to step S138. In step S138, the thawing control is executed. That is, the controller 20 switches the four-way valve 34 (see fig. 1) in the direction indicated by the broken line so that the indoor heat exchanger 64 serves as a condenser, thereby heating the indoor heat exchanger 64.
Thereby, the frost formed in the indoor heat exchanger 64 is melted, and the surface of the indoor heat exchanger 64 is cleaned. Next, the process proceeds to step S140, where drying control is executed. In the drying control, the control device 20 stops the freezing cycle RC to continuously drive the indoor fan 66 for a predetermined time. Thereby, the surface of the indoor heat exchanger 64 is dried. Next, when the process proceeds to step S142, the operation stop process is executed. Here, the indoor fan 66 is stopped. As described above, the processing of the present routine is ended.
(details of freezing control)
Next, details of the freeze controls F1, F2, and F3 in steps S130, S132, and S134 will be described. In these steps, an applicable moisture intake PH is sought based on the relative humidity H and the moisture intake table stored in the control device 20.
Fig. 4 is a diagram showing an example of a moisture intake map. As shown, the moisture uptake PH is a uniquely determined amount relative to the relative humidity H. The moisture intake amount graph actually stores the moisture intake amounts PH at three points of the illustrated relative humidities LH, MH, and HH. Then, the controller 20 calculates the moisture intake amount PH other than these three points by linear interpolation.
The amount of moisture taken in PH is defined as A [ g/m ] where the amount of saturated water vapor at room temperature T is3]The air volume of the indoor fan 66 is Bm3/min]The air supply time of the indoor fan 66 is set as C [ min ]]In freezing control F1, the PH is an amount represented by "a × B × C"The gas intake amount PH is a predetermined value PH 1. In addition, in the freezing control F3, the moisture take-in amount PH is a predetermined value PH 3. In the freezing control F2, the moisture intake amount PH decreases as the relative humidity H increases, and becomes a monotonous decreasing function. In addition, as described above, when the constant LH and the constant HH are respectively 40% and 60%, the predetermined value PH1 is 1.5 to 3 times the predetermined value PH 3.
In the above steps S130, S132, and S134, the control device 20 determines the driving conditions of the indoor fan 66 so as to realize the moisture intake amount PH obtained from the moisture intake amount map (fig. 4). Then, the control device 20 drives the indoor fan 66 according to the determined driving condition.
Here, the saturated water vapor amount a is uniquely determined when the room temperature T is determined. If it is considered that the variation of the room temperature T can be ignored during the freezing control period, the saturated steam amount a can be considered to be a constant. In the present embodiment, the rotation speed of the indoor fan 66 during freeze control, that is, the above-described frost-time rotation speed is constant. In the present embodiment, the position of the up-down wind direction plate 150 is the washing operation position 154 shown in fig. 2 in the freezing control.
Here, if the rotational speed of the indoor fan 66 during frost deposition is constant and the position of the up-down wind direction plate 150 is also the cleaning operation position 154, it can be considered that the air volume B is also constant. Considering the saturated steam amount a and the air volume B as constants in this way, determining the driving conditions of the indoor fan 66 is equivalent to determining the blowing time C proportional to the moisture intake amount PH. Therefore, if the predetermined value PH1 is 1.5 to 3 times the predetermined value PH3, the blowing time C in the freeze control F1 is 1.5 to 3 times the blowing time C in the freeze control F3.
In steps S130, S132, and S134, the controller 20 (see fig. 1) switches the four-way valve 34 in the direction indicated by the solid line so that the indoor heat exchanger 64 serves as an evaporator. Then, the controller 20 rotates the up-down airflow plate 150 to the cleaning operation position 154 (see fig. 2), and sets the rotation speed of the compressor 32, the opening degree of the indoor expansion valve 62, and the like so that the surface temperature of the indoor heat exchanger 64 is below the freezing point. Next, the control device 20 drives the indoor fan 66 at a time corresponding to the air blowing time C obtained previously and at the rotational speed during frost formation. Thereby, frost forms in the indoor heat exchanger 64. When the air blowing time C elapses, the control device 20 stops the indoor fan 66.
When the indoor fan 66 is stopped, frost attached to the indoor heat exchanger 64 further grows due to the water vapor contained in the indoor unit 60. In the present embodiment, the execution times from the start to the end of steps S130, S132, and S134 are the same, and this execution time is referred to as "freeze control time D". The freezing control time D is, for example, 20 minutes. The air blowing time C is, for example, about 7 minutes in the freezing control F1 and about 3 minutes in the freezing control F3. The time for which the indoor fan 66 is stopped and frost is grown is equal to "D-C", which is about 13 to 17 minutes in the above embodiment.
That is, the blowing time C is half or less of the freezing control time D. Accordingly, the frost formed in the indoor heat exchanger 64 can be sufficiently grown in the non-blowing state by the moisture in the indoor unit 60. In addition, the period during which the indoor fan 66 is driven is concentrated on the first half of the freeze control time D. This enables operation in which the moisture is mainly taken in the first half and the growth is mainly performed in the second half. More specifically, the controller 20 stops the indoor fan 66 in the second half of the freezing control time D. This can further promote the growth of frost in the latter half.
Here, when the freeze purge operation is performed when the outside air temperature TD is low, the pressure difference between the pressure of the refrigerant discharged from the compressor 32 and the pressure of the refrigerant sucked into the compressor 32 becomes small, and may fall below the reference range of the compressor 32. In this state, if the control device 20 stops the indoor fan 66, frost formed in the indoor heat exchanger 64 cannot be sufficiently grown. Therefore, the rotation speed of the outdoor fan 48 when the indoor fan 66 is stopped can be made higher than the rotation speed of the outdoor fan 48 during driving of the indoor fan 66. In particular, when the freeze washing operation is performed at or below the predetermined value of the outdoor air temperature TD, the amount of frost formed in the indoor heat exchanger 64 can be increased by controlling the outdoor fan 48 in this manner.
< Effect of the first embodiment >
According to the above embodiment, the control device 20 has the function of performing the freezing control for causing the surface temperature of the indoor heat exchanger 64 to be below the freezing point by causing the indoor heat exchanger 64 to function as an evaporator when the washing operation is performed (S130, S132, S134), and the function of driving the indoor fan 66 for a predetermined period shorter than the execution period of the freezing control during the execution of the freezing control and causing the indoor fan 66 to be in the stopped state for a period other than the predetermined period (S130, S132, S134). The predetermined period is equal to or less than half of the execution period of the freeze control.
In this manner, in the predetermined period shorter than the execution period of the freezing control, it is more preferable that the frost accumulated in the indoor heat exchanger 64 can be sufficiently grown by driving the indoor fan 66 for a time equal to or less than half of the execution period of the freezing control, and the indoor heat exchanger 64 can be appropriately cleaned.
The control device 20 has a function of shortening the driving time of the indoor fan 66 in the latter half of the execution period of the freeze control as compared with the driving time of the indoor fan 66 in the former half of the execution period of the freeze control. Accordingly, since the operation in which the moisture is taken in as an important point in the first half and the frost growth is important in the second half can be performed, the indoor heat exchanger 64 can be cleaned more appropriately.
Further, the control device 20 stops the indoor fan 66 in the second half of the execution period of the freezing control. This can further promote the growth of frost in the second half period, and the indoor heat exchanger 64 can be cleaned more appropriately.
The air conditioner 100 further includes an operation unit 90 for specifying an air volume by an operation of a user, and the rotation speed of the indoor fan 66 during the cleaning operation is lower than the rotation speed of the lowest air volume that can be specified by the operation of the operation unit 90. This can suppress the cool air leaking into the air-conditioned room when the washing operation is performed, and can suppress the discomfort of the user.
The air conditioner 100 further includes a humidity sensor 74 that detects the humidity H of the air flowing out of the air-conditioning room, and the control device 20 shortens the driving time of the indoor fan 66 as the detected humidity becomes higher. As described above, by shortening the driving time of the indoor fan 66 as the humidity becomes higher, condensation and the like at unintended positions in the air conditioner 100 can be suppressed.
The air conditioner 100 further includes an outdoor fan 48, and the control device 20 sets the rotation speed of the outdoor fan outside the predetermined period to be higher than the rotation speed of the outdoor fan during the predetermined period during execution of the freezing control. This can increase the amount of frost formed in the indoor heat exchanger 64.
The air conditioner 100 further includes an outdoor fan 48 and an outdoor air temperature sensor 51 that detects an outdoor air temperature TD, and the control device 20 is characterized in that the rotation speed of the outdoor fan outside the predetermined period is set higher than the rotation speed of the outdoor fan during the predetermined period when the outdoor air temperature TD detected by the outdoor air temperature sensor 51 is equal to or lower than a predetermined temperature during execution of the freezing control. This can further increase the amount of frost formed in the indoor heat exchanger 64.
[ second embodiment ]
Next, the structure of an air conditioner according to a second embodiment of the present invention will be described. In the following description, the same reference numerals are given to parts corresponding to the parts of the other embodiments described above, and the description thereof may be omitted.
The configuration and operation of the present embodiment are the same as those of the first embodiment (see fig. 1 to 3) except for the following points.
First, in step S100 (see fig. 3) of the present embodiment, the control device 20 obtains a value as the "estimated relative humidity value Hest" based on the room temperature T in addition to the processing of the first embodiment. In addition, the estimated relative humidity value Hest can be applied to the processing after step S102 instead of the relative humidity H in the first embodiment.
Fig. 5 is a diagram showing an example of the relationship between the room temperature T and the estimated relative humidity value Hest.
As shown, the estimated relative humidity value Hest is a function that monotonically increases as the room temperature T rises. Here, the reason why the estimated relative humidity value Hest can be used instead of the relative humidity H is based on the correlation between the temperature and the relative humidity according to the installation area of the air conditioner 100. For example, assume that the air conditioner 100 is set in japan. When the climate in japan is considered, the temperature tends to be low in winter and high in summer.
Meanwhile, the relative humidity tends to be low in winter and high in summer. Accordingly, the relative humidity has a correlation that monotonically increases with respect to the temperature. Therefore, even when the estimated relative humidity value Hest is used instead of the relative humidity H, the air conditioner 100 can be expected to operate appropriately.
As described above, the air conditioner according to the present embodiment further includes the temperature sensor 70 that detects the temperature of the air flowing from the air-conditioned room, and the control device 20 shortens the drive time of the indoor fan 66 as the detected temperature becomes higher. This can eliminate the indoor heat exchanger inlet humidity sensor 74 shown in fig. 1 and 2, and can reduce the cost of the air conditioner.
[ modified examples ]
The present invention is not limited to the above embodiment, and various modifications are possible. The above embodiments are illustrative for easy understanding of the present invention, and are not necessarily limited to the embodiments having all the configurations described in the description. In addition, a part of the structure in one embodiment may be replaced with the structure in another embodiment. The structure of another embodiment may be added to the structure of one embodiment. Further, a part of the structure of each embodiment may be deleted, or another structure may be added or replaced. The control lines and information lines shown in the drawings are considered necessary for the description, and do not necessarily represent all the control lines and information lines required for a product. In practice, almost all structures can be considered to be connected to each other. Possible modifications to the above embodiment are as follows.
(1) In each of the above embodiments, various determinations are made based on the relative humidity H or the estimated relative humidity value Hest, but instead of these, various determinations may be made based on the absolute humidity or the estimated value thereof.
(2) Since the hardware of the control device 20 in the above-described embodiment can be realized by a general computer, the program or the like in the flowchart shown in fig. 3 can be stored in a storage medium or distributed via a transmission path.
(3) The process shown in fig. 3 is described as a process of software design using a program in the above embodiment, but a part or all of the process may be replaced with a process using hardware such as an ASIC (Application Specific integrated circuit) or an fpga (field Programmable Gate array).
(4) The present invention is suitable for use in a ceiling-embedded indoor unit in which the environment of an air-conditioned room and the environment of the indoor unit are likely to differ from each other, but is not limited to the type of indoor unit. For example, the present invention is applicable to a wall-mounted indoor unit and a window-type air conditioner in which an indoor unit and an outdoor unit are integrated.
Description of the symbols
20-control unit, 32-compressor, 48-outdoor fan, 51-outdoor heat exchanger inlet temperature sensor (outside air temperature sensor), 64-indoor heat exchanger, 66-indoor fan, 70-indoor heat exchanger inlet air temperature sensor (temperature sensor), 74-indoor heat exchanger inlet humidity sensor (humidity sensor), 90-remote controller (operation part), 100-air conditioner, H-relative humidity (humidity), RC-refrigeration cycle.
The claims (modification according to treaty clause 19)
(modified) an air conditioner, characterized in that,
the disclosed device is provided with:
a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger;
a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and
an indoor fan is arranged in the room, and the fan is arranged in the room,
the control device has the following functions:
a function of performing freezing control for causing a surface temperature of the indoor heat exchanger to be below a freezing point, while the indoor heat exchanger functions as an evaporator in performing the cleaning operation;
a function of driving the indoor fan for a predetermined period shorter than an execution period of the freezing control during execution of the freezing control, and bringing the indoor fan into a stopped state outside the predetermined period; and
and a function of shortening the driving time of the indoor fan in the latter half of the execution period of the freeze control as compared with the driving time of the indoor fan in the former half of the execution period of the freeze control.
2. The air conditioner according to claim 1,
the predetermined period is equal to or less than half of the execution period of the freeze control.
(deletion)
(modified) the air conditioner according to claim 2,
the control device stops the indoor fan in a second half of an execution period of the freezing control.
5. The air conditioner according to claim 1,
further comprises an operation part for specifying the air volume by the operation of the user,
the rotation speed of the indoor fan in the cleaning operation is lower than the rotation speed in the lowest air volume that can be specified by the operation of the operation unit.
6. The air conditioner according to claim 1,
further comprises a humidity sensor for detecting the humidity of the air flowing in from the air conditioner,
in the control device, the driving time of the indoor fan is shortened as the humidity detected by the humidity sensor is higher.
7. The air conditioner according to claim 1,
further comprises a temperature sensor for detecting the temperature of the air flowing from the air conditioning chamber,
in the control device, the driving time of the indoor fan is shortened as the temperature detected by the temperature sensor is higher.
(modified) an air conditioner, characterized in that,
the disclosed device is provided with:
a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger;
a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger;
an indoor fan; and
an outdoor fan for cooling the air outside the room,
the control device has the following functions:
a function of performing freezing control for causing a surface temperature of the indoor heat exchanger to be below a freezing point, while the indoor heat exchanger functions as an evaporator in performing the cleaning operation; and
a function of driving the indoor fan for a predetermined period shorter than an execution period of the freezing control during execution of the freezing control and stopping the indoor fan outside the predetermined period,
in the execution of the freezing control, the control device may set the rotation speed of the outdoor fan outside the predetermined period to be higher than the rotation speed of the outdoor fan during the predetermined period.
(modified) an air conditioner, characterized in that,
the disclosed device is provided with:
a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger;
a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger;
an indoor fan;
an outdoor fan; and
an outside air temperature sensor that detects an outside air temperature,
the control device has the following functions:
a function of performing freezing control for causing a surface temperature of the indoor heat exchanger to be below a freezing point, while the indoor heat exchanger functions as an evaporator in performing the cleaning operation;
a function of driving the indoor fan for a predetermined period shorter than an execution period of the freezing control during execution of the freezing control and stopping the indoor fan outside the predetermined period,
in the execution of the freezing control, when the outside air temperature detected by the outside air temperature sensor is equal to or lower than a predetermined temperature, the control device increases the rotation speed of the outdoor fan outside the predetermined period of time to be higher than the rotation speed of the outdoor fan during the predetermined period of time.
(modified) a control method of an air conditioner, the air conditioner comprising: a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger; a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and an indoor fan, the method for controlling the air conditioner is characterized in that,
comprises the following steps:
a process of performing freezing control in which the indoor heat exchanger functions as an evaporator and the surface temperature of the indoor heat exchanger is below the freezing point when the cleaning operation is performed; and
a step of driving the indoor fan for a predetermined period shorter than the execution period of the freezing control during execution of the freezing control and bringing the indoor fan into a stopped state outside the predetermined period,
the driving time of the indoor fan in the latter half of the execution period of the freezing control is shortened as compared with the driving time of the indoor fan in the former half of the execution period of the freezing control.
(modified) a program for an air conditioner, the air conditioner comprising: a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger; a computer for controlling the refrigeration cycle in a manner of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and a fan, the program for an air conditioner being characterized in that,
the computer functions as:
a unit that performs freezing control in which the indoor heat exchanger functions as an evaporator and a surface temperature of the indoor heat exchanger is below a freezing point when the cleaning operation is performed; and
means for driving the indoor fan for a predetermined period shorter than an execution period of the freezing control during execution of the freezing control, and bringing the indoor fan into a stopped state outside the predetermined period; and
means for shortening the driving time of the indoor fan in the latter half of the execution period of the freezing control as compared with the driving time of the indoor fan in the former half of the execution period of the freezing control.
Statement or declaration (modification according to treaty clause 19)
The features of claim 3 are defined with respect to claim 1.
Claim 3 is deleted.
Claims 8 and 9 are amended to the independent claims.
The features corresponding to claim 3 are defined in claims 10 and 11.

Claims (11)

1. An air conditioner is characterized in that,
the disclosed device is provided with:
a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger;
a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and
an indoor fan is arranged in the room, and the fan is arranged in the room,
the control device has the following functions:
a function of performing freezing control for causing a surface temperature of the indoor heat exchanger to be below a freezing point, while the indoor heat exchanger functions as an evaporator in performing the cleaning operation; and
and a function of driving the indoor fan for a predetermined period shorter than the execution period of the freezing control during execution of the freezing control, and stopping the indoor fan for a period other than the predetermined period.
2. The air conditioner according to claim 1,
the predetermined period is equal to or less than half of the execution period of the freeze control.
3. The air conditioner according to claim 1,
the control device has a function of shortening the driving time of the indoor fan in the latter half of the execution period of the freezing control as compared with the driving time of the indoor fan in the former half of the execution period of the freezing control.
4. An air conditioner according to claim 2 or 3,
the control device stops the indoor fan in a second half of an execution period of the freezing control.
5. The air conditioner according to claim 1,
further comprises an operation part for specifying the air volume by the operation of the user,
the rotation speed of the indoor fan in the cleaning operation is lower than the rotation speed in the lowest air volume that can be specified by the operation of the operation unit.
6. The air conditioner according to claim 1,
further comprises a humidity sensor for detecting the humidity of the air flowing in from the air conditioner,
in the control device, the driving time of the indoor fan is shortened as the humidity detected by the humidity sensor is higher.
7. The air conditioner according to claim 1,
further comprises a temperature sensor for detecting the temperature of the air flowing from the air conditioning chamber,
in the control device, the driving time of the indoor fan is shortened as the temperature detected by the temperature sensor is higher.
8. The air conditioner according to claim 1,
and an outdoor fan is also provided,
in the execution of the freezing control, the control device may set the rotation speed of the outdoor fan outside the predetermined period to be higher than the rotation speed of the outdoor fan during the predetermined period.
9. The air conditioner according to claim 1,
further comprises an outdoor fan and an outside air temperature sensor for detecting the outside air temperature,
in the execution of the freezing control, when the outside air temperature detected by the outside air temperature sensor is equal to or lower than a predetermined temperature, the control device increases the rotation speed of the outdoor fan outside the predetermined period of time to be higher than the rotation speed of the outdoor fan during the predetermined period of time.
10. A method for controlling an air conditioner, the air conditioner comprising: a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger; a control device for controlling the refrigeration cycle in a mode of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and an indoor fan, the method for controlling the air conditioner is characterized in that,
comprises the following steps:
a process of performing freezing control in which the indoor heat exchanger functions as an evaporator and the surface temperature of the indoor heat exchanger is below the freezing point when the cleaning operation is performed; and
and a step of driving the indoor fan for a predetermined period shorter than the execution period of the freezing control during execution of the freezing control, and bringing the indoor fan into a stopped state for a period other than the predetermined period.
11. A program for an air conditioner, the air conditioner comprising: a refrigeration cycle having a compressor for compressing a refrigerant and an indoor heat exchanger; a computer for controlling the refrigeration cycle in a manner of executing a cleaning operation for cleaning the surface of the indoor heat exchanger; and a fan, the program for an air conditioner being characterized in that,
the computer functions as:
a unit that performs freezing control in which the indoor heat exchanger functions as an evaporator and a surface temperature of the indoor heat exchanger is below a freezing point when the cleaning operation is performed; and
and a unit that drives the indoor fan for a predetermined period shorter than the execution period of the freezing control during execution of the freezing control, and stops the indoor fan for a period other than the predetermined period.
CN201880003390.4A 2018-10-05 2018-10-05 Air conditioner and control method thereof Active CN111356881B (en)

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