CN117073137A - Defrosting method and system for air conditioner operation - Google Patents
Defrosting method and system for air conditioner operation Download PDFInfo
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- CN117073137A CN117073137A CN202311017310.XA CN202311017310A CN117073137A CN 117073137 A CN117073137 A CN 117073137A CN 202311017310 A CN202311017310 A CN 202311017310A CN 117073137 A CN117073137 A CN 117073137A
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- 238000010257 thawing Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 71
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 22
- 238000004378 air conditioning Methods 0.000 claims description 21
- 238000011084 recovery Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003570 air Substances 0.000 description 117
- 238000005265 energy consumption Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
-
- 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
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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
- F24F11/70—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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an air conditioner operation defrosting method and system, comprising the following steps: monitoring current of an air conditioner compressor and indoor temperature data in real time; calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data; calculating a current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value, and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score; if the air conditioner needs defrosting, adjusting the flow rate of an air conditioner condensing agent and the rotating speed of an indoor fan according to the comprehensive score of the air conditioner; judging whether defrosting is finished according to the indoor temperature data, and if defrosting is finished, gradually recovering the refrigerant flow and the fan rotating speed. According to the invention, the refrigerant flow and the indoor fan rotating speed can be adaptively adjusted according to the current use environment factors, so that the defrosting efficiency is greatly improved, and the energy is saved; the air conditioner can avoid the condition of stopping or reducing the refrigerating efficiency when in defrosting operation, and can maintain a good refrigerating effect during defrosting treatment.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner operation defrosting method and system.
Background
Air conditioning, including but not limited to a multi-split central air conditioner and a fresh air machine, is quite common in modern society for adjusting indoor temperature so that the indoor temperature more accords with the physical comfort of people. The basic components of an air conditioner having a heating function generally include a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, and a throttle valve. When the air conditioner heats, the compressor operates to compress the refrigerant into a high-temperature and high-pressure gas refrigerant; the high temperature, high pressure gaseous refrigerant then passes through an indoor heat exchanger (which now acts as a condenser) to dissipate heat into the indoor to heat the indoor air, while the high temperature, high pressure gaseous refrigerant is condensed into a medium and high temperature liquid refrigerant; the medium-high temperature liquid refrigerant is then throttled into a low-temperature and low-pressure liquid refrigerant by a throttle valve (such as an electronic expansion valve or a thermal expansion valve); the low temperature, low pressure liquid refrigerant flows into the outdoor heat exchanger (which now acts as an evaporator) and evaporates therein into a low temperature, low pressure gaseous refrigerant by absorbing heat from the outdoor ambient air; the low temperature, low pressure gaseous refrigerant is then drawn in by the compressor and recompressed into a high temperature, high pressure gaseous refrigerant, and the air conditioner begins a new cycle accordingly.
When the temperature of the external environment is already low (e.g., near 0 ℃ or lower than 0 ℃), the temperature of the surface of the outdoor heat exchanger during the evaporation of the refrigerant is lowered to be lower than the temperature of the external environment, and thus the surface of the outdoor heat exchanger is likely to be frosted.
The frosting will reduce the air channels between the fins of the outdoor heat exchanger, increase the thermal resistance of the outdoor heat exchanger, lead to the rapid deterioration of the performance of the outdoor heat exchanger, and even possibly lead to the damage of the outdoor heat exchanger in severe cases, so that the defrosting is necessary when the frost layer of the outdoor heat exchanger reaches a certain thickness.
In the prior art, before defrosting of an air conditioner starts, whether defrosting treatment is needed or not cannot be accurately judged; once defrosting is started, the refrigerant and the indoor fan are controlled by adopting fixed flow rate and rotating speed, and the indoor fan cannot be fully suitable for dynamic environments; during the defrost process, it is often necessary to shut down or reduce the refrigeration efficiency, greatly affecting the user experience.
In view of this, the present invention has been made.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides an air conditioner operation defrosting method and system, which can effectively solve the problems in the background art.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention discloses an air conditioner operation defrosting method, which comprises the following steps:
monitoring current of an air conditioner compressor and indoor temperature data in real time;
calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
calculating a current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value, and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
if the air conditioner needs defrosting, adjusting the flow rate of an air conditioner condensing agent and the rotating speed of an indoor fan according to the comprehensive score of the air conditioner;
judging whether defrosting is finished according to the indoor temperature data, and if defrosting is finished, gradually recovering the refrigerant flow and the fan rotating speed.
In any of the above schemes, preferably, the calculating the compressor current characteristic value and the temperature characteristic value according to the air conditioner compressor current and the indoor temperature data comprises the following steps:
obtaining current values of compressors at n continuous time points, and calculating current average values at n continuous time points;
indoor temperature values at n consecutive time points are acquired, and indoor temperature change rates at n consecutive time points are calculated.
In any of the above schemes, it is preferable that the formula:calculating the current average I of n consecutive time points avg The method comprises the steps of carrying out a first treatment on the surface of the By the formula: />Calculating the indoor temperature change rate +.>In this formula, i is a time point number, and T is an indoor temperature.
In any of the above schemes, preferably, the method calculates a current air conditioner integrated score according to the compressor current characteristic value and the temperature characteristic value, and judges whether the air conditioner operates defrosting according to the air conditioner integrated score, including the following steps:
calculating a current air conditioner comprehensive score S according to the current average value of n continuous time points and the indoor temperature change rate;
setting a comprehensive score threshold S t If S > S t Judging that the air conditioner needs to operate for defrosting, if S is less than or equal to S t And judging that the air conditioner does not need to operate defrosting.
In any of the above schemes, preferably, the calculating the current air conditioner integrated score S according to the average value of the current at n consecutive time points and the indoor temperature change rate includes:
setting a current threshold I t By the formula:calculating the current ratio I ratio ；
Screening the indoor temperature change rates of n time points to obtain the maximum indoor temperature change rate
By the formula:calculate the air conditioner integrated score S, in this case, w 1 And w 2 Is a weight coefficient.
In any of the above schemes, preferably, if the air conditioner needs to defrost, the air conditioner condensing agent flow and the indoor fan rotation speed are adjusted according to the air conditioner comprehensive score, and the method comprises the following steps:
dividing the defrosting process into N sections of time, and calculating the refrigerant flow adjustment proportion and the air conditioning fan rotating speed adjustment proportion in the current time period according to the air conditioning comprehensive score S in the previous time period in each section of time;
and adjusting the refrigerant flow and the air conditioning fan rotating speed in the current time period according to the refrigerant flow adjusting proportion and the air conditioning fan rotating speed adjusting proportion in the current time period.
In any of the above solutions, preferably, the calculating the refrigerant flow adjustment ratio and the air conditioning fan rotation speed adjustment ratio in the current time period according to the air conditioning composite score S in the previous time period includes:
setting an air conditioner comprehensive score threshold S t And maximum value S of air conditioner integrated score max ；
By the formula:calculating the refrigerant flow adjustment ratio k Q And adjusting the refrigerant flow rate by a ratio k Q Is defined between 0 and 1, in this formula S max S is the preset maximum value of the air conditioner comprehensive score t A comprehensive score threshold value for the air conditioner;
by the formula: k (k) V ＝1-k Q Calculating the rotating speed adjusting proportion k of the air conditioner fan V In this formula: k (k) Q The ratio is adjusted for the refrigerant flow.
In any of the above schemes, preferably, the method includes judging whether to complete defrosting according to indoor temperature data, if yes, gradually recovering the refrigerant flow and the fan rotation speed, and includes the following steps:
setting an indoor temperature recovery threshold T rt If the indoor temperature at m continuous time points is higher than the indoor temperature recovery threshold T rt Judging that defrosting is completed;
setting a recovery period, dividing the recovery period into R sections, and gradually recovering the refrigerant flow and the fan rotating speed to a normal running state.
In any of the above schemes, preferably, the setting a recovery period, dividing the recovery period into R segments, gradually recovering the refrigerant flow and the fan rotation speed to the normal operation state, includes:
by the formula:calculating refrigerant flow rate Q in r time period ref,r In the present formula, Q ref Is the reference value of the refrigerant flow, Q normal Is the normal working value of the refrigerant flow;
by the formula:calculating the rotation speed of an air conditioner fan in the r time period, wherein V fan Is the reference value of the rotation speed of the air conditioner fan, V norrmal Is the normal working value of the rotating speed of the air conditioner fan.
In a second aspect, an air conditioner operating defrost system, the system comprising the steps of:
the monitoring module is used for monitoring the current of the air conditioner compressor and the indoor temperature data in real time;
the first calculation module is used for calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
the second calculation module is used for calculating the current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
the defrosting module is used for adjusting the flow rate of the air conditioner condensing agent and the rotating speed of the indoor fan according to the comprehensive score of the air conditioner if the air conditioner needs to defrost;
and the recovery module is used for judging whether defrosting is finished according to the indoor temperature data, and if the defrosting is finished, gradually recovering the flow of the refrigerant and the rotating speed of the fan.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an air conditioner operation defrosting method and system, which can adaptively adjust the flow of a refrigerant and the rotating speed of an indoor fan according to the current use environment factors, thereby greatly improving the defrosting efficiency and saving energy sources; the condition that the air conditioner stops or the refrigerating efficiency is reduced when in defrosting can be avoided, meanwhile, a good refrigerating effect can be maintained during defrosting treatment, and the user experience is greatly improved;
unnecessary energy consumption and waste are avoided by precisely controlling defrosting operation, high-efficiency defrosting is realized, and meanwhile, the electric energy consumption is reduced, so that the energy-saving and environment-friendly concept is met; and the air conditioner can be realized by using the existing air conditioner hardware equipment without adding a complex sensor or controller additionally.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
FIG. 1 is a schematic flow chart of a defrosting method for operating an air conditioner according to the present invention;
fig. 2 is a schematic block diagram of an air conditioner operation defrosting system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In order to better understand the above technical scheme, the following detailed description of the technical scheme of the present invention will be given with reference to the accompanying drawings of the specification and the specific embodiments.
As shown in fig. 1, an air conditioner operation defrosting method includes the steps of:
step 1, monitoring current of an air conditioner compressor and indoor temperature data in real time;
step 2, calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
step 3, calculating a current air conditioner comprehensive score according to the compressor current characteristic value and the temperature characteristic value, and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
step 4, if the air conditioner needs defrosting, adjusting the air conditioner condensing agent flow and the indoor fan rotating speed according to the air conditioner comprehensive score;
and 5, judging whether defrosting is finished according to the indoor temperature data, and if the defrosting is finished, gradually recovering the flow of the refrigerant and the rotating speed of the fan.
In the defrosting method for air conditioner operation according to the embodiment of the present invention,
the state change of the air conditioner in the running process can be effectively captured by monitoring the current of the air conditioner compressor and the indoor temperature data in real time, and in addition, the analysis precision of the running condition of the air conditioner is further improved by calculating the current characteristic value and the temperature characteristic value of the compressor according to the collected data;
the current air conditioner comprehensive score is calculated by utilizing the current characteristic value and the temperature characteristic value of the compressor, whether the air conditioner needs to be defrosted or not is intelligently judged, after the air conditioner needs to be defrosted is confirmed, the air conditioner condensing agent flow and the indoor fan rotating speed are automatically adjusted according to the air conditioner comprehensive score, and the accurate control of the air conditioner defrosting operation is realized;
whether defrosting is finished is judged by monitoring indoor temperature data, so that the defrosting effect is expected, the energy consumption increase or the refrigeration effect reduction caused by excessive defrosting is avoided, meanwhile, the refrigerant flow and the fan rotating speed are gradually recovered after defrosting is finished, and the air conditioner operation efficiency and the indoor comfort level are maintained.
Specifically, step 2, calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data, includes the following steps:
step 21, obtaining current values of compressors at n continuous time points, and calculating current average values at n continuous time points;
step 22, acquiring indoor temperature values at n continuous time points, and calculating indoor temperature change rates at n continuous time points.
In the above step, the current average value and the indoor temperature change rate are calculated by:
by the formula:calculating the current average I of n consecutive time points avg ；
By the formula:calculating the indoor temperature change rate at n consecutive time pointsIn this formula, i is a time point number, and T is an indoor temperature.
In the method for defrosting an air conditioner according to the embodiment of the present invention, whether the air conditioner is frosted or not can be determined by two strategies, on one hand, whether the air conditioner is frosted or not is determined by monitoring the current change of the air conditioner compressor, and when the surface of the evaporator is frosted, the flow of the refrigerant is blocked, so that the load of the air conditioner compressor is increased, and in this case, the current of the compressor generally has a more obvious rise. Therefore, in the running process of the air conditioner, the current value of the compressor is monitored in real time, and when the current exceeds a set threshold value, the phenomenon of frosting is considered to exist; on the other hand, the indoor temperature change rate is monitored by an indoor temperature sensor of the air conditioner itself. When the indoor temperature drop rate is significantly slowed or stagnant, it is considered that there may be a blooming phenomenon.
Specifically, the step 3 calculates a current air conditioner comprehensive score according to the compressor current characteristic value and the temperature characteristic value, and judges whether the air conditioner operates defrosting according to the air conditioner comprehensive score, and the method comprises the following steps:
step 31, calculating a current air conditioner comprehensive score S according to the current average value of n continuous time points and the indoor temperature change rate;
step 32, setting a composite score threshold S t If S > S t Judging that the air conditioner needs to operate for defrosting, if S is less than or equal to S t And judging that the air conditioner does not need to operate defrosting.
Further, the step 31 calculates a current air conditioner integrated score S according to the average value of the current at n consecutive time points and the indoor temperature change rate, including:
step 311, setting a current threshold I t By the formula:calculating the current ratio I ratio ；
Step 312, screening the indoor temperature change rates at n time points to obtain the maximum indoor temperature change rate
Step 313, by the formula:calculate the air conditioner integrated score S, in this case, w 1 And w 2 Is a weight coefficient.
Specifically, step 4, if the air conditioner needs to defrost, adjusts the air conditioner condensing agent flow and the indoor fan rotation speed according to the air conditioner comprehensive score, and includes the following steps:
step 41, dividing the defrosting process into N periods of time, and calculating the refrigerant flow adjustment proportion and the air conditioning fan rotating speed adjustment proportion in the current period of time according to the air conditioning comprehensive score S in the previous period of time in each period of time;
and step 42, adjusting the refrigerant flow and the air conditioning fan rotating speed in the current time period through the refrigerant flow adjusting proportion and the air conditioning fan rotating speed adjusting proportion in the current time period.
In step 41, the calculating the refrigerant flow adjustment ratio and the air conditioning fan rotation speed adjustment ratio in the current time period according to the air conditioning integrated score S in the previous time period includes:
setting an air conditioner comprehensive score threshold S t And maximum value S of air conditioner integrated score max ；
By the formula:calculating the refrigerant flow adjustment ratio k Q And adjusting the refrigerant flow rate by a ratio k Q Is defined between 0 and 1, in this formula S max S is the preset maximum value of the air conditioner comprehensive score t A comprehensive score threshold value for the air conditioner;
by the formula: k (k) V ＝1-k Q Calculating the speed of air conditioner fanProportion k V In this formula: k (k) Q The ratio is adjusted for the refrigerant flow.
Further, the step 42 of adjusting the refrigerant flow and the air conditioning fan rotation speed in the current period according to the refrigerant flow adjustment ratio and the air conditioning fan rotation speed adjustment ratio in the current period includes:
by the formula: q (Q) ref ＝Q min +k Q ·(Q max -Q min ) Regulating the refrigerant flow Q ref In the present formula, Q max And Q min Is the maximum value of the refrigerant flow rate and the minimum value of the refrigerant flow rate;
by the formula: v (V) fan ＝V min +k V ·(V max -V min ) Adjusting the rotation speed V of the air conditioner fan fan In the present formula, V max And V min Is the maximum value of the rotational speed of the air conditioning fan and the minimum value of the rotational speed of the air conditioning fan.
Specifically, step 5, judge whether to finish defrosting according to indoor temperature data, if finish defrosting, resume refrigerant flow and fan rotational speed step by step, including the following steps:
step 51, setting an indoor temperature recovery threshold T rt If the indoor temperature at m continuous time points is higher than the indoor temperature recovery threshold T rt Judging that defrosting is completed;
and 52, setting a recovery period, dividing the recovery period into R sections, and gradually recovering the refrigerant flow and the fan rotating speed to the normal running state.
Further, the step 52 of setting a recovery period and dividing the recovery period into R segments gradually recovering the refrigerant flow and the fan rotation speed to the normal operation state includes:
by the formula:calculating refrigerant flow rate Q in r time period ref,r In the present formula, Q ref Is the reference value of the refrigerant flow, Q normal Is the normal working value of the refrigerant flow;
by the formula:calculating the rotation speed of an air conditioner fan in the r time period, wherein V fan Is the reference value of the rotation speed of the air conditioner fan, V norrmal Is the normal working value of the rotating speed of the air conditioner fan.
The reference value of the refrigerant flow and the reference value of the indoor fan rotation speed are calculated by a designer or manufacturer of the equipment according to experimental results and theories.
In the air conditioner operation defrosting method disclosed by the embodiment of the invention, in the defrosting process, the temperatures of the refrigerating device and the heat transfer device are reduced, so that the operation efficiency is reduced, if the normal working state is suddenly restored, larger load impact is brought to the refrigerating device and the heat transfer device, damage or other faults can be possibly caused, and therefore, a gradual restoration mode is required to be adopted, so that the refrigerant flow and the fan rotating speed gradually return to the normal working state.
As shown in fig. 2, an air conditioner operates a defrosting system, which includes the steps of:
the monitoring module is used for monitoring the current of the air conditioner compressor and the indoor temperature data in real time;
the first calculation module is used for calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
the second calculation module is used for calculating the current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
the defrosting module is used for adjusting the flow rate of the air conditioner condensing agent and the rotating speed of the indoor fan according to the comprehensive score of the air conditioner if the air conditioner needs to defrost;
and the recovery module is used for judging whether defrosting is finished according to the indoor temperature data, and if the defrosting is finished, gradually recovering the flow of the refrigerant and the rotating speed of the fan.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the refrigerant flow and the indoor fan rotating speed can be adaptively adjusted according to the current use environment factors, so that the defrosting efficiency is greatly improved, and the energy is saved; the condition that the air conditioner stops or the refrigerating efficiency is reduced when in defrosting can be avoided, meanwhile, a good refrigerating effect can be maintained during defrosting treatment, and the user experience is greatly improved;
unnecessary energy consumption and waste are avoided by precisely controlling defrosting operation, high-efficiency defrosting is realized, and meanwhile, the electric energy consumption is reduced, so that the energy-saving and environment-friendly concept is met; and the air conditioner can be realized by using the existing air conditioner hardware equipment without adding a complex sensor or controller additionally.
The above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An air conditioner operation defrosting method is characterized in that: the method comprises the following steps:
monitoring current of an air conditioner compressor and indoor temperature data in real time;
calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
calculating a current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value, and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
if the air conditioner needs defrosting, adjusting the flow rate of an air conditioner condensing agent and the rotating speed of an indoor fan according to the comprehensive score of the air conditioner;
judging whether defrosting is finished according to the indoor temperature data, and if defrosting is finished, gradually recovering the refrigerant flow and the fan rotating speed.
2. The air conditioner operation defrosting method according to claim 1, wherein: according to the air conditioner compressor current and indoor temperature data, calculating a compressor current characteristic value and a temperature characteristic value, wherein the method comprises the following steps of:
obtaining current values of compressors at n continuous time points, and calculating current average values at n continuous time points;
indoor temperature values at n consecutive time points are acquired, and indoor temperature change rates at n consecutive time points are calculated.
3. The air conditioner operation defrosting method according to claim 2, wherein:
by the formula:calculating the current average I of n consecutive time points avg ；
By the formula:calculating the indoor temperature change rate +.>In this formula, i is a time point number, and T is an indoor temperature.
4. The air conditioner operation defrosting method according to claim 3, wherein: the method comprises the following steps of calculating a current air conditioner comprehensive score according to a compressor current characteristic value and a temperature characteristic value, judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score, and judging whether the air conditioner operates defrosting or not, wherein the method comprises the following steps:
calculating a current air conditioner comprehensive score S according to the current average value of n continuous time points and the indoor temperature change rate;
setting a comprehensive score threshold S t If S > S t Judging that the air conditioner needs to operate for defrosting, if S is less than or equal to S t And judging that the air conditioner does not need to operate defrosting.
5. The air conditioner operation defrosting method according to claim 4, wherein: the calculating the current air conditioner comprehensive score S according to the current average value and the indoor temperature change rate of n continuous time points comprises the following steps:
setting a current threshold I t By the formula:calculating the current ratio I ratio ；
Screening the indoor temperature change rates of n time points to obtain the maximum indoor temperature change rate
By the formula:calculate the air conditioner integrated score S, in this case, w 1 And w 2 Is a weight coefficient.
6. The air conditioner operation defrosting method according to claim 5, wherein: if the air conditioner needs defrosting, adjusting the air conditioner condensing agent flow and the indoor fan rotating speed according to the air conditioner comprehensive score, and comprising the following steps:
dividing the defrosting process into N sections of time, and calculating the refrigerant flow adjustment proportion and the air conditioning fan rotating speed adjustment proportion in the current time period according to the air conditioning comprehensive score S in the previous time period in each section of time;
and adjusting the refrigerant flow and the air conditioning fan rotating speed in the current time period according to the refrigerant flow adjusting proportion and the air conditioning fan rotating speed adjusting proportion in the current time period.
7. The air conditioner operation defrosting method according to claim 6, wherein: according to the air conditioner comprehensive score S of the previous time period, calculating the refrigerant flow adjustment proportion and the air conditioner fan rotation speed adjustment proportion of the current time period includes:
setting an air conditioner comprehensive score threshold S t And maximum value S of air conditioner integrated score max ；
By the formula:calculating the refrigerant flow adjustment ratio k Q And adjusting the refrigerant flow rate by a ratio k Q Is defined between 0 and 1, in this formula S max S is the preset maximum value of the air conditioner comprehensive score t A comprehensive score threshold value for the air conditioner;
by the formula: k (k) V ＝1-k Q Calculating the rotating speed adjusting proportion k of the air conditioner fan V In this formula: k (k) Q The ratio is adjusted for the refrigerant flow.
8. The air conditioner operation defrosting method according to claim 7, wherein: judging whether defrosting is finished according to indoor temperature data, if so, gradually recovering the flow of the refrigerant and the rotating speed of the fan, and comprising the following steps:
setting an indoor temperature recovery threshold T rt If the indoor temperature at m continuous time points is higher than the indoor temperature recovery threshold T rt Judging that defrosting is completed;
setting a recovery period, dividing the recovery period into R sections, and gradually recovering the refrigerant flow and the fan rotating speed to a normal running state.
9. The air conditioner operation defrosting method according to claim 8, wherein: the recovery period is set, the recovery period is divided into R sections, and the refrigerant flow and the fan rotating speed are gradually recovered to a normal running state, and the method comprises the following steps:
by the formula:calculating refrigerant flow rate Q in r time period ref,r In the present formula, Q ref Is the reference value of the refrigerant flow, Q normal Is the normal working value of the refrigerant flow;
by the formula:calculating the rotation speed of an air conditioner fan in the r time period, wherein V fan Is the reference value of the rotation speed of the air conditioner fan, V norrmal Is the normal working value of the rotating speed of the air conditioner fan.
10. An air conditioner operation defrosting system, which is characterized in that: the system comprises the following steps:
the monitoring module is used for monitoring the current of the air conditioner compressor and the indoor temperature data in real time;
the first calculation module is used for calculating a compressor current characteristic value and a temperature characteristic value according to the air conditioner compressor current and the indoor temperature data;
the second calculation module is used for calculating the current air conditioner comprehensive score according to the current electric current characteristic value and the temperature characteristic value and judging whether the air conditioner operates defrosting according to the air conditioner comprehensive score;
the defrosting module is used for adjusting the flow rate of the air conditioner condensing agent and the rotating speed of the indoor fan according to the comprehensive score of the air conditioner if the air conditioner needs to defrost;
and the recovery module is used for judging whether defrosting is finished according to the indoor temperature data, and if the defrosting is finished, gradually recovering the flow of the refrigerant and the rotating speed of the fan.
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