CN109084443B - Air conditioner outdoor unit condenser frosting inhibition method and air conditioner - Google Patents

Air conditioner outdoor unit condenser frosting inhibition method and air conditioner Download PDF

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CN109084443B
CN109084443B CN201810836090.6A CN201810836090A CN109084443B CN 109084443 B CN109084443 B CN 109084443B CN 201810836090 A CN201810836090 A CN 201810836090A CN 109084443 B CN109084443 B CN 109084443B
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temperature
outdoor
frost
time
suppression control
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CN109084443A (en
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李越峰
张娣
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Sichuan Changhong Air Conditioner Co Ltd
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Sichuan Changhong Air Conditioner Co Ltd
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    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F11/77—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 by controlling the speed of ventilators
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F24F2110/22—Humidity of the outside air
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a method for inhibiting frosting of a condenser of an air conditioner outdoor unit and an air conditioner, comprising the following steps of: s1: when the air conditioner is in a heating mode, the outdoor fan normally operates; s2: real-time detection of outdoor ambient temperature ToaRelative humidity of outdoor air phi and outdoor condenser coil temperature Tp(ii) a S3: according to ToaObtaining the dew point temperature T by the enthalpy-humidity diagram fitting functiond(ii) a S4: judgment of TpWhether or not higher than TdIf yes, executing S5, otherwise executing S2; s5: and (3) frost inhibition control: and controlling the outdoor fan to increase the rotating speed and operate in the forward direction. The invention can accurately judge the frosting time and environment, can effectively inhibit the adhesion of frost flowers, obviously delay the frosting time, greatly reduce the defrosting frequency, reduce the time of indoor temperature fluctuation caused by shutdown defrosting, and improve the comfort of the air conditioner.

Description

Air conditioner outdoor unit condenser frosting inhibition method and air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a method for inhibiting frosting of a condenser of an air conditioner outdoor unit and an air conditioner.
Background
With the increasing living standard of people, the air conditioner becomes a necessary electrical appliance for each family, the refrigeration or heating process of the air conditioner is actually the heat exchange process, when the heat pump heats, the outdoor condenser absorbs the heat at the outdoor side, and the air conditioning system transfers the heat to the indoor side to release the heat. When the air conditioner heats, when the temperature of the fins of the outdoor heat exchanger is lower than the dew point temperature of air, the surfaces of the fins begin to condense water, when the temperature of the surfaces of the fins is lower than the freezing point temperature, the frosting phenomenon can not be avoided, the frosting phenomenon is a phase change phenomenon, a large amount of heat can be discharged, and heat exchange is just started to be facilitated. Therefore, during heating, the outdoor condenser is frequently frosted and defrosted, which causes indoor temperature fluctuation and affects comfort of the air conditioner.
The invention discloses a control method for relieving frosting of an outdoor condenser of an air conditioner in a patent CN101975440B, wherein whether the temperature T1 of an indoor evaporator coil is met is detected, T1 is more than or equal to N, wherein N is more than or equal to 31 ℃ and less than or equal to 50 ℃, if yes, the temperature T2 of the outdoor condenser coil is continuously detected, and otherwise, the outdoor condenser is defrosted; when the temperature T2 is less than or equal to 0 ℃ and lasts for a certain time, the rotating speed of the indoor and outdoor fan motors is adjusted to delay the frosting treatment of the outdoor condenser, and through the treatment, the frosting time is delayed after the normal indoor heating effect is ensured. Although this control method has a certain effect on inhibiting condensation and frost formation, the judgment on the frost formation time and the environment is rough, and whether the frost formation is inhibited or not is judged only by the temperature of the outdoor condenser coil, so that the frost crystals cannot be removed at the first time of frost formation, and the effect of inhibiting the frost formation is not ideal.
In addition, experiments prove that in the early frosting stage, the frost layer is mainly generated by dendritic frost flowers, the attachment of the frost flowers cannot be completely inhibited only by increasing the rotating speed of the fan and only by unidirectional wind power, the frost flowers growing in the height direction can be blown down or blown to a position far away from an air opening, so that the frost layer is sequentially thickened along one direction, the effect of delaying frosting is not ideal, and the frost layers are not easy to remove.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the air conditioner outdoor unit condenser frosting inhibition method and the air conditioner, which can accurately judge the frosting environment, effectively inhibit the attachment of frost flowers, obviously delay the frosting time, prolong the effective heating time, reduce the influence on the indoor temperature fluctuation caused by shutdown defrosting and improve the comfort of the air conditioner.
A method for inhibiting frosting of a condenser of an air conditioner outdoor unit comprises the following steps:
s1: when the air conditioner is in a heating mode, the outdoor fan normally operates;
s2: real-time detection of outdoor ambient temperature ToaRelative humidity of outdoor air phi and outdoor condenser coil temperature Tp；
S3: according to the outdoor ambient temperature ToaObtaining the corresponding dew point temperature T according to the relative humidity phi of the outdoor air through a preset functiond；
S4: judging the temperature T of the coil pipe of the outdoor condenserpWhether it is lower than freezing point temperature and not higher than dew point temperature TdIf yes, executing S5, otherwise returning to execute step S2;
s5: and (3) frost inhibition control: and controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed.
Further, before executing S5, the following steps are executed:
s41: timing according to preset frost inhibition judgment time, and if the outdoor condenser coil temperature T is in the timing processpIs always lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, the air conditioner enters into frost suppression control after timing is finished, and step S5 is executed; otherwise, the process returns to step S2.
Further, the method comprises the following steps:
s6: when the positive operation of the outdoor fan reaches the preset first frost suppression control time, the T at the moment is subjected topAnd (4) judging: if TpTemperature below freezing point and not higher than dew point temperature TdThen go to step S7; otherwise, stopping the frost suppression control of the air conditioner, recovering the normal operation of the outdoor fan, and returning to execute the step S2;
s7: and (4) judging: if the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value, the air conditioner continuously operates at the rotating speed until a defrosting condition is reached, the air conditioner enters defrosting control, and the method is ended; otherwise, the process returns to step S5.
Further, the method comprises the following steps:
s6: when the forward operation of the outdoor fan reaches the preset valueAt the first frost suppressing control time, T at that momentpAnd (4) judging: if TpTemperature below freezing point and not higher than dew point temperature TdThen go to step S7; otherwise, stopping the frost suppression control of the air conditioner, recovering the normal operation of the outdoor fan, and returning to execute the step S2;
s7: and (4) judging: if the rotating speed of the outdoor fan reaches the preset rotating speed upper limit threshold, entering second-stage frost suppression control, and executing step S8; otherwise, returning to execute the step S5;
s8: and (3) second-stage frost inhibition control: controlling the outdoor fan to alternately perform forward running and reverse running according to preset forward running time and reverse running time and perform the forward running and the reverse running in a circulating manner;
s9: during the second stage of frost suppression control, once TpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second stage of the defrosting control exceeds the preset second defrosting control time, stopping the second stage of the defrosting control, recovering the normal operation of the outdoor fan, and returning to execute the step S2; otherwise, the second-stage frost suppression control is kept running until the defrosting condition is reached, the air conditioner stops the second-stage frost suppression control, the defrosting control is started, and the method is ended.
An air conditioner, includes outdoor fan, still includes:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, executing a frost suppression control instruction, namely controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time and sending humidity information to the control unit;
and the storage module is used for storing preset values, including preset functions.
Further, still include:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, sending an instruction to enable a timing module to time, and if not, ending the timing until the temperature T is measuredpIs always lower than the freezing point temperature and is not higher than the dew point temperature TdExecuting a frost suppression control instruction, namely controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed;
the timing module is used for timing according to preset frost inhibition judgment time when receiving the instruction;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time and sending humidity information to the control unit;
and the storage module is used for storing preset values, including preset functions and frost inhibition judgment time.
Further, the control unit is also used for controlling the positive running of the outdoor fan when the positive running of the outdoor fan reaches the preset first frost control time when the frost control is carried outpAnd (4) judging:
if TpA temperature below freezing point and not higher than the dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, the outdoor fan continuously operates at the rotating speed, and if not, a frost suppression control instruction is executed; when the operation is continuously carried out at the rotating speed and the defrosting condition is reached, an instruction is sent to stop defrosting control and execute the instruction of defrosting control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operationA row;
the timing module is also used for timing according to preset first frost suppression control time during frost suppression control;
and the storage module is also used for storing the first frost suppression control time and the upper limit threshold of the rotating speed.
Further, the control unit is also used for controlling the positive running of the outdoor fan when the positive running of the outdoor fan reaches the preset first frost control time when the frost control is carried outpAnd (4) judging:
if TpA temperature below freezing point and not higher than the dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, an instruction is sent to enter second-stage frost suppression control, namely the outdoor fan is controlled to alternately carry out forward operation and reverse operation according to preset forward operation time and reverse operation time and to be executed in a circulating mode, and if not, a frost suppression control instruction is executed; once T during the second stage of frost suppression controlpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second-stage defrosting control exceeds the preset second defrosting control time, sending an instruction to stop the second-stage defrosting control and controlling the outdoor fan to recover to normal operation, otherwise, keeping the second-stage defrosting control to operate until a defrosting condition is reached, sending an instruction to stop the second-stage defrosting control and executing the defrosting control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operation;
the timing module is also used for timing according to preset first frost suppression control time during the frost suppression control, timing according to preset second frost suppression control time during the second-stage frost suppression control, and timing according to preset forward running time and reverse running time during the second-stage frost suppression control;
the storage module is also used for storing the first frost suppression control time, the second frost suppression control time, the upper limit threshold value of the rotating speed, the forward operation time and the reverse operation time.
Furthermore, the rotating speed of the outdoor fan in the frost suppression control is increased quantitatively or proportionally, the rotating speed N increased each time in the quantitative increasing process is less than or equal to 50r/min, and the ratio of the rotating speed after the increasing process in the proportional increasing process to the rotating speed before the increasing process is less than or equal to 120%.
Further, the upper threshold of the rotation speed is set to 150% of the rated rotation speed of the outdoor fan.
Compared with the prior art, the invention has the following beneficial effects:
1. obtaining dew point temperature data in real time through a preset function, and calculating the temperature T of the outdoor condenser coilpWith freezing point and corresponding dew point temperature TdThe comparison is carried out, based on the combined judgment of the dew point and the freezing point temperature, the time and the environment for starting the frosting of the coil pipe can be accurately judged, the generation of the frost crystals can be effectively inhibited by the mode of the speed-up operation of the outdoor fan when the frost crystals start to condense or are about to start to condense, the frequency for entering defrosting control is effectively reduced, and the accuracy of the frosting judgment is improved;
2. the frost inhibition effect is improved by gradually increasing the rotating speed of the fan, so that the frost inhibition effect is ensured, the energy consumption and the noise pollution are reduced as much as possible, and the comfort of a user is improved;
3. through setting up the two-stage and suppressing the frost control, increased positive and negative circulation operation's mode and strengthened suppressing the frost control on the basis that outdoor fan acceleration rate is suppressed the frost, can effectively restrain the adhesion of frost flower, showing the time that has delayed the frost, greatly reduced the frequency of defrosting, reduced because of shutting down the time that the defrosting leads to indoor temperature fluctuation, promoted user's travelling comfort.
Drawings
FIG. 1 is a schematic block flow diagram of method example 1;
FIG. 2 is a schematic block diagram of the flow of the optimization scheme in method example 1;
FIG. 3 is a schematic block flow diagram of method example 2;
FIG. 4 is a schematic block flow diagram of method embodiment 3;
FIG. 5 is a schematic structural diagram of an embodiment of the apparatus.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with reference to the specific drawings.
Method example 1:
as shown in fig. 1, a method for suppressing frost formation of a condenser of an outdoor unit of an air conditioner includes the steps of:
s1: when the air conditioner is in a heating mode, the outdoor fan normally operates;
s2: real-time detection of outdoor ambient temperature ToaRelative humidity of outdoor air phi and outdoor condenser coil temperature Tp；
S3: according to the outdoor ambient temperature ToaObtaining the corresponding dew point temperature T according to the relative humidity phi of the outdoor air through a preset functiond；
S4: judging the temperature T of the coil pipe of the outdoor condenserpWhether it is below freezing point (0 ℃ at standard atmospheric pressure) and not higher than dew point temperature TdIf yes, executing S5, otherwise returning to execute step S2;
s5: and (3) frost inhibition control: and controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed.
The outdoor ambient temperature, i.e. the outdoor dry bulb temperature, the relative humidity of the outdoor air can in an embodiment be replaced by the outdoor wet bulb temperature, since either the relative humidity or the wet bulb temperature can be used together with the outdoor ambient temperature to derive the corresponding dew point temperature by means of a preset function. The preset function described herein is defined by the outdoor ambient temperature and the relative humidity of the outdoor air (or outdoor wet bulb temperature T)ow) The input of (a) obtains a function corresponding to the dew point temperature output, which can be obtained by fitting the corresponding data in the psychrometric chart (or psychrometric chart). It can be understood that, in order to facilitate the intelligent control of the air conditioning equipment, the preset function may store the data in the psychrometric chart in a memory inside the air conditioning by means of a fitting function, which is a method already existing in the prior art, and there may be many fitting modes as long as it can achieve relatively accurate conversion of the corresponding data in the psychrometric chart, so specific fitting functions are not listed here. The psychrometric chart may generally compriseDry bulb temperature, wet bulb temperature, dew point temperature, relative humidity, moisture content, enthalpy and the like. In particular, the rotating speed of the outdoor fan in the frost suppression control can be increased quantitatively or proportionally, the rotating speed N of each time of increasing in the quantitative increasing can be selected to be a value not greater than 50r/min, and the specific increasing value can be a certain fixed value or can be determined according to specific situations; the proportional acceleration rate can increase the rotating speed to a value which is not more than 120% of the previous rotating speed each time, and the acceleration rate can be a certain fixed value or can be determined according to specific conditions.
When temperature T of coilpBelow TdAir appears as moisture in a dewing manner, following TpFurther lowering, when the temperature is below freezing point, the frosting phenomenon will occur. According to the relevant literature for researching frosting process, the frosting process is started in the form of super-cooling water drops, and although the frosting mechanism of the cold face is very complex, the cold face frosting basically goes through the processes of water drop generation, growth, freezing, initial frost crystal generation, growth and the like. As the initial frost crystals grow, the passages among the fins can be shielded in a crossed manner, so that the wind speed can be reduced rapidly, the heat exchange capacity can be reduced rapidly, and if part of unsolidified frost crystals can be delayed or removed, the air circulation among the fins can be kept, and the heat exchange can be continued. That is, the coil pipe frosts, and has two basic conditions, namely, the temperature of the coil pipe is lower than the dew point temperature, otherwise, the coil pipe cannot be dewed, and the coil pipe cannot be frosted; and secondly, the temperature of the coil is lower than the freezing point, otherwise, the top of the coil is more dewed and does not frost. In other words, as long as the coil temperature is above either the dew point temperature or the freezing point, no frost will form on the coil. The method of this embodiment is implemented by adjusting the outdoor condenser coil temperature TpCorresponding freezing point temperature and dew point temperature TdMeanwhile, comparison is carried out, so that the time and the environment for the coil pipe to frost can be accurately judged, the frost crystal generation is effectively inhibited in the mode of the speed-up operation of the outdoor fan when the frost crystal just starts or is about to condense, the frequency of entering defrosting control is effectively reduced, and the accuracy of frost judgment and the comfort of a user are improved. If in this way the coil temperature can be raised above the dew point temperature or freezing point temperature, thenWhen the frost crystal stops growing or is eliminated, the frost inhibition control can be stopped, and the outdoor fan returns to normal operation.
As shown in fig. 2, as a further optimized solution, the method includes the following steps:
s1: when the air conditioner is in a heating mode, the outdoor fan normally operates;
s2: real-time detection of outdoor ambient temperature ToaRelative humidity of outdoor air phi and outdoor condenser coil temperature Tp；
S3: according to the outdoor ambient temperature ToaObtaining the corresponding dew point temperature T according to the relative humidity phi of the outdoor air through a preset functiond；
S4: judging the temperature T of the coil pipe of the outdoor condenserpWhether it is lower than freezing point temperature and not higher than dew point temperature TdIf yes, executing S41, otherwise returning to execute step S2;
s41: timing according to preset frost inhibition judgment time, and if the outdoor condenser coil temperature T is in the timing processpIs always lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, the air conditioner enters into frost suppression control after timing is finished, and step S5 is executed; otherwise, the process returns to step S2.
S5: and (3) frost inhibition control: and controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed.
The frost suppression judging time can be set according to specific conditions, and preferably, a value less than 150 seconds can be selected. When the frost inhibition judgment time is selected to be 0 second, the scheme is simplified into a scheme (namely a scheme before optimization) of skipping the frost inhibition judgment timing and directly entering the frost inhibition control.
Considering that the coil temperature is possibly detected wrongly due to some accidental reasons, the time delay judgment is added before the frost inhibition control is carried out, so that the accuracy of frost inhibition judgment can be further improved, and the stability of the frost inhibition control is ensured.
The freezing point temperature in this context may be the freezing zero point temperature of water in the use environment set before installation of the air conditioner according to parameters such as ambient air pressure.
Method example 2:
as shown in fig. 3, a method for suppressing frost formation of a condenser of an outdoor unit of an air conditioner according to any one of embodiments 1 of the method further includes:
s6: when the positive operation of the outdoor fan reaches the preset first frost suppression control time, the T at the moment is subjected topAnd (4) judging: if TpTemperature below freezing point and not higher than dew point temperature TdThen go to step S7; otherwise, stopping the frost suppression control of the air conditioner, recovering the normal operation of the outdoor fan, and returning to execute the step S2;
s7: and (4) judging: if the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value, the air conditioner continuously operates at the rotating speed until a defrosting condition is reached, the air conditioner enters defrosting control, and the method is ended; otherwise, the process returns to step S5.
The preset first frost suppression control time can be set according to specific conditions, and preferably, a value less than 150 seconds can be selected. The upper threshold of the rotation speed can be set differently according to different types of motors, for example, the upper threshold of the rotation speed can be set to 150% of the rated rotation speed of the outdoor fan. The defrost conditions and defrost control described herein may be implemented in the prior art and will not be described further herein.
The embodiment is based on T after the outdoor fan accelerates and inhibits frostpJudging whether the coil pipe of the condenser of the outdoor unit is still in a frost crystal growth state or not, and strengthening the inhibition on the growth of the frost crystals by gradual acceleration after successive judgment after the frost inhibition for a period of time. If the frost crystal growth cannot be inhibited when the rotating speed of the outdoor fan reaches the preset upper rotating speed limit, then defrosting control is carried out to thoroughly remove the frost crystals; once the rotating speed of the outdoor fan reaches the preset rotating speed upper limit, frost crystals cannot grow on the coil (namely the temperature of the coil is higher than the freezing point or the dew point), the air conditioner should quit the frost suppression control, and the normal operation is recovered. Therefore, the air conditioner defrosting control efficiency can be effectively improved, and the frequency of entering defrosting control is reduced.
Method example 3:
as shown in fig. 4, a method for suppressing frost formation of a condenser of an outdoor unit of an air conditioner according to any one of embodiments 1 of the method further includes:
s6: when the positive operation of the outdoor fan reaches the preset first frost suppression control time, the T at the moment is subjected topAnd (4) judging: if TpTemperature below freezing point and not higher than dew point temperature TdThen go to step S7; otherwise, stopping the frost suppression control of the air conditioner, recovering the normal operation of the outdoor fan, and returning to execute the step S2;
s7: and (4) judging: if the rotating speed of the outdoor fan reaches the preset rotating speed upper limit threshold, entering second-stage frost suppression control, and executing step S8; otherwise, returning to execute the step S5;
s8: and (3) second-stage frost inhibition control: controlling the outdoor fan to alternately perform forward running and reverse running according to preset forward running time and reverse running time and perform the forward running and the reverse running in a circulating manner;
s9: during the second stage of frost suppression control, once TpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second stage of the defrosting control exceeds the preset second defrosting control time, stopping the second stage of the defrosting control, recovering the normal operation of the outdoor fan, and returning to execute the step S2; otherwise, the second-stage frost suppression control is kept running until the defrosting condition is reached, the air conditioner stops the second-stage frost suppression control, the defrosting control is started, and the method is ended.
The forward running time and the reverse running time can be selected from 5-60 seconds, and are preferably 20 seconds.
In the embodiment, the second-stage frost suppression control is added on the basis of the method embodiment 2, and the frost suppression control is realized by performing forward and reverse circulating operation after the rotating speed of the outdoor fan reaches the preset upper limit, because the traditional one-way wind only blows more frost flowers to the position far away from the air inlet, the frost layer is sequentially thickened along one direction, and the two-way circulating wind in the method can solve the problem, effectively suppress the adhesion of the frost flowers, remarkably delay the frost formation time, greatly reduce the defrosting frequency, reduce the time of indoor temperature fluctuation caused by shutdown defrosting, and improve the comfort of the air conditioner.
Apparatus example 1:
as shown in fig. 5, an air conditioner includes an outdoor fan, and further includes:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point and not higher than the dew point temperature TdIf yes, executing a frost suppression control instruction, namely controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time when the air conditioner is in a heating mode, and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time when the air conditioner is in a heating mode and sending humidity information to the control unit;
and the storage module is used for storing preset values, including preset functions.
The control unit is respectively connected with the temperature sensor, the humidity sensor and the storage module.
The apparatus in this embodiment may implement the method as described in the scheme of method embodiment 1. The control unit described herein may employ an MCU or a PLC, etc.
Apparatus example 2:
as shown in fig. 5, an air conditioner includes an outdoor fan, and further includes:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point and not higher than the dew point temperature TdIf yes, sending an instruction to enable a timing module to time, and if not, ending the timing until the temperature T is measuredpIs not higher than the dew point temperature T all the timedExecuting a frost suppression control command, namely controlling the outdoor fan to increase the rotating speed and using the increased speedThe rotating speed is positively operated;
the timing module is used for timing according to preset frost inhibition judgment time when receiving the instruction;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time when the air conditioner is in a heating mode, and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time when the air conditioner is in a heating mode and sending humidity information to the control unit;
and the storage module is used for storing preset values, including preset functions and frost inhibition judgment time.
The control unit is respectively connected with the timing module, the temperature sensor, the humidity sensor and the storage module.
The apparatus in this embodiment may implement the method as described in the optimization scheme in method embodiment 1. The frost suppression judging time can be preferably 100-150 seconds.
Apparatus example 3:
as shown in fig. 5, in addition to any of the air conditioners described in device embodiments 1 or 2:
the control unit is also used for controlling the forward running of the outdoor fan when the forward running reaches the preset first frost suppression control time when the frost suppression control is carried outpAnd (4) judging:
if TpTemperature below freezing point and not higher than dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, the outdoor fan continuously operates at the rotating speed, and if not, a frost suppression control instruction is executed; when the operation is continuously carried out at the rotating speed and the defrosting condition is reached, an instruction is sent to stop defrosting control and execute the instruction of defrosting control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operation;
the timing module is also used for timing according to preset first frost suppression control time during frost suppression control;
and the storage module is also used for storing the first frost suppression control time and the upper limit threshold of the rotating speed.
The control unit is respectively connected with the timing module, the temperature sensor, the humidity sensor and the storage module.
The apparatus in this embodiment may implement the method as described in method embodiment 2. The frost suppression judging time can be preferably 100-150 seconds. The upper limit threshold of the rotating speed can be set differently according to different types of motors, for example, the upper limit threshold of the rotating speed can be set to be 80-95% of the maximum rotating speed of the outdoor fan.
It can be understood that, for the defrosting control, in addition to the judgment of whether the rotating speed of the outdoor fan reaches the preset upper rotating speed threshold, the defrosting control can also be judged according to whether the increasing times of the rotating speed of the outdoor fan reaches the preset threshold of the increasing times of the rotating speed; it is to be understood that it is further possible to determine by both of the above two thresholds together, and the defrosting control can be entered as long as either one of the two thresholds is satisfied.
Apparatus example 4:
as shown in fig. 5, in addition to any of the air conditioners described in device embodiments 1 or 2:
the control unit is also used for controlling the forward running of the outdoor fan when the forward running reaches the preset first frost suppression control time when the frost suppression control is carried outpAnd (4) judging:
if TpTemperature below freezing point and not higher than dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, an instruction is sent to enter second-stage frost suppression control, namely the outdoor fan is controlled to alternately carry out forward operation and reverse operation according to preset forward operation time and reverse operation time and to be executed in a circulating mode, and if not, a frost suppression control instruction is executed; once T during the second stage of frost suppression controlpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second-stage defrosting control exceeds the preset second-stage defrosting control time, sending an instruction to stop the second-stage defrosting control and controlling the outdoor fan to recover to normal operation, otherwise, keeping the second-stage defrosting control to operate until the defrosting condition is reached, sending an instruction to stop the second-stage defrosting control and executing the second-stage defrosting controlInstructions for defrost control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operation;
the timing module is also used for timing according to preset first frost suppression control time during the frost suppression control, timing according to preset second frost suppression control time during the second-stage frost suppression control, and timing according to preset forward running time and reverse running time during the second-stage frost suppression control;
the storage module is also used for storing the first frost suppression control time, the second frost suppression control time, the upper limit threshold value of the rotating speed, the forward operation time and the reverse operation time.
The control unit is respectively connected with the timing module, the temperature sensor, the humidity sensor and the storage module.
The apparatus in this embodiment may implement the method as described in method embodiment 3. The first defrosting control time and the second defrosting control time can be freely set according to specific conditions and requirements, for example, the first defrosting control time can be preferably 100-150 seconds, and the second defrosting control time is preferably 10-120 seconds. The upper threshold of the rotating speed can be set differently according to different types of motors, for example, 150% of the rated rotating speed of the outdoor fan or 80-95% of the maximum rotating speed can be set. The forward running time and the reverse running time can be between 5 and 60 seconds; in particular, the forward running time and the reverse running time are preferably 20 seconds.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, and all technical solutions belonging to the principle of the present invention belong to the protection scope of the present invention. Modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.

Claims (6)

1. A method for inhibiting frosting of a condenser of an outdoor unit of an air conditioner is characterized by comprising the following steps:
s1: when the air conditioner is in a heating mode, the outdoor fan normally operates;
s2: real-time detection of outdoor ambient temperature ToaRelative humidity of outdoor air phi and outdoor condenser coil temperature Tp；
S3: according to the outdoor ambient temperature ToaObtaining the corresponding dew point temperature T according to the relative humidity phi of the outdoor air through a preset functiond；
S4: judging the temperature T of the coil pipe of the outdoor condenserpWhether it is lower than freezing point temperature and not higher than dew point temperature TdIf yes, executing S5, otherwise returning to execute step S2;
s5: and (3) frost inhibition control: controlling the outdoor fan to increase the rotating speed and positively operating at the increased rotating speed;
s6: when the positive operation of the outdoor fan reaches the preset first frost suppression control time, the T at the moment is subjected topAnd (4) judging: if TpTemperature below freezing point and not higher than dew point temperature TdThen go to step S7; otherwise, stopping the frost suppression control of the air conditioner, recovering the normal operation of the outdoor fan, and returning to execute the step S2;
s7: and (4) judging: if the rotating speed of the outdoor fan reaches the preset rotating speed upper limit threshold, entering second-stage frost suppression control, and executing step S8; otherwise, returning to execute the step S5;
s8: and (3) second-stage frost inhibition control: controlling the outdoor fan to alternately perform forward running and reverse running according to preset forward running time and reverse running time and perform the forward running and the reverse running in a circulating manner;
s9: during the second stage of frost suppression control, once TpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second stage of the defrosting control exceeds the preset second defrosting control time, stopping the second stage of the defrosting control, recovering the normal operation of the outdoor fan, and returning to execute the step S2; otherwise, the second-stage frost suppression control is kept running until the defrosting condition is reached, the air conditioner stops the second-stage frost suppression control, the defrosting control is started, and the method is ended.
2. The outdoor unit condenser frost suppressing method of claim 1, wherein the following steps are performed before S5 is performed:
s41: timing according to preset frost inhibition judgment time, and if the outdoor condenser coil temperature T is in the timing processpIs always lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, the air conditioner enters into frost suppression control after timing is finished, and step S5 is executed; otherwise, the process returns to step S2.
3. The utility model provides an air conditioner, includes outdoor fan, its characterized in that still includes:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, executing a frost suppression control instruction, namely controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time and sending humidity information to the control unit;
the storage module is used for storing preset values, including preset functions;
the control unit is also used for controlling the forward running of the outdoor fan to T when the forward running of the outdoor fan reaches the preset first frost suppression control time during the frost suppression controlpAnd (4) judging:
if TpA temperature below freezing point and not higher than the dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, an instruction is sent to enter second-stage frost suppression control, namely the outdoor fan is controlled to alternately carry out forward operation and reverse operation according to preset forward operation time and reverse operation time and to be executed in a circulating mode, and if not, the frost suppression control is executedInstructions; once T during the second stage of frost suppression controlpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second-stage defrosting control exceeds the preset second defrosting control time, sending an instruction to stop the second-stage defrosting control and controlling the outdoor fan to recover to normal operation, otherwise, keeping the second-stage defrosting control to operate until a defrosting condition is reached, sending an instruction to stop the second-stage defrosting control and executing the defrosting control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operation;
the timing module is also used for timing according to preset first frost suppression control time during the frost suppression control, timing according to preset second frost suppression control time during the second-stage frost suppression control, and timing according to preset forward running time and reverse running time during the second-stage frost suppression control;
the storage module is also used for storing first frost suppression control time, second frost suppression control time, a rotating speed upper limit threshold value, forward operation time and reverse operation time.
4. The utility model provides an air conditioner, includes outdoor fan, its characterized in that still includes:
a control unit for controlling the outdoor environment temperature T according to the detected temperatureoaThe relative humidity phi of the outdoor air detected by the humidity sensor is used for obtaining the corresponding dew point temperature T through a preset functiond(ii) a Outdoor condenser coil temperature T detected by temperature sensorpJudging whether the temperature is lower than the freezing point temperature and is not higher than the dew point temperature TdIf yes, sending an instruction to enable a timing module to time, and if not, ending the timing until the temperature T is measuredpIs always lower than the freezing point temperature and is not higher than the dew point temperature TdExecuting a frost suppression control instruction, namely controlling the outdoor fan to increase the rotating speed and positively operate at the increased rotating speed;
the timing module is used for timing according to preset frost inhibition judgment time when receiving the instruction;
the temperature sensor is used for detecting the temperature of the outdoor condenser coil and the outdoor environment temperature in real time and sending temperature information to the control unit;
the humidity sensor is used for detecting the relative humidity phi of outdoor air in real time and sending humidity information to the control unit;
the storage module is used for storing preset values, including preset functions and frost inhibition judgment time;
the control unit is also used for controlling the forward running of the outdoor fan to T when the forward running of the outdoor fan reaches the preset first frost suppression control time during the frost suppression controlpAnd (4) judging:
if TpA temperature below freezing point and not higher than the dew point temperature TdAnd then judging: whether the rotating speed of the outdoor fan reaches a preset rotating speed upper limit threshold value or not is judged, if yes, an instruction is sent to enter second-stage frost suppression control, namely the outdoor fan is controlled to alternately carry out forward operation and reverse operation according to preset forward operation time and reverse operation time and to be executed in a circulating mode, and if not, a frost suppression control instruction is executed; once T during the second stage of frost suppression controlpNot lower than freezing point temperature or higher than dew point temperature TdIf the duration time of the second-stage defrosting control exceeds the preset second defrosting control time, sending an instruction to stop the second-stage defrosting control and controlling the outdoor fan to recover to normal operation, otherwise, keeping the second-stage defrosting control to operate until a defrosting condition is reached, sending an instruction to stop the second-stage defrosting control and executing the defrosting control;
if TpNot lower than freezing point temperature or higher than dew point temperature TdIf so, sending an instruction to stop frost suppression control and controlling the outdoor fan to recover normal operation;
the timing module is also used for timing according to preset first frost suppression control time during the frost suppression control, timing according to preset second frost suppression control time during the second-stage frost suppression control, and timing according to preset forward running time and reverse running time during the second-stage frost suppression control;
the storage module is also used for storing first frost suppression control time, second frost suppression control time, a rotating speed upper limit threshold value, forward operation time and reverse operation time.
5. The method for suppressing frost formation in a condenser of an outdoor unit of an air conditioner according to any one of claims 1 to 2 or the air conditioner according to any one of claims 3 to 4, wherein:
the rotating speed of the outdoor fan in the frost suppression control is increased quantitatively or proportionally, the rotating speed N increased each time in the quantitative increasing is less than or equal to 50r/min, and the ratio of the rotating speed after the increasing in the proportional increasing to the rotating speed before the increasing is less than or equal to 120%.
6. The method for suppressing frost formation in a condenser of an outdoor unit of an air conditioner according to any one of claims 1 to 2 or the air conditioner according to any one of claims 3 to 4, wherein:
the rotating speed upper limit threshold is set to be 150% of the rated rotating speed of the outdoor fan.
CN201810836090.6A 2018-07-26 2018-07-26 Air conditioner outdoor unit condenser frosting inhibition method and air conditioner Active CN109084443B (en)

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