CN110500713B - Defrosting control method and device for ensuring continuous heating and multi-split system - Google Patents
Defrosting control method and device for ensuring continuous heating and multi-split system Download PDFInfo
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- CN110500713B CN110500713B CN201910780542.8A CN201910780542A CN110500713B CN 110500713 B CN110500713 B CN 110500713B CN 201910780542 A CN201910780542 A CN 201910780542A CN 110500713 B CN110500713 B CN 110500713B
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/64—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
- F24F11/62—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
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method and device for ensuring continuous heating and a multi-split system. Wherein, the method comprises the following steps: when the system needs defrosting, determining the number M of the current heating operation modules; comparing the M with the total number N of the modules of the system, and selecting a corresponding defrosting control strategy according to the comparison result so as to control the modules needing defrosting to enter a defrosting state; wherein, at least, it is ensured that a module in the system is still in a heating state. The invention can realize continuous heating and quick defrosting of the air conditioning system, and solves the problems of frequent fluctuation of indoor environment temperature and even cold air blowing caused by frequent frosting and defrosting when the unit operates in certain environments (such as winter in cold and humid areas). Guarantee that the unit changes the white operation period, indoor ambient temperature remains stable, guarantees that heat pump set indoor set is continuously heated during changing the white operation period, guarantees that the user uses the travelling comfort, gives the optimal use experience of user.
Description
Technical Field
The invention relates to the technical field of multi-online systems, in particular to a defrosting control method and device for ensuring continuous heating and a multi-online system.
Background
The air source heat pump is increasingly widely applied to small and medium-sized buildings and partial public buildings, and is one of the most active central air conditioning systems at present; when the unit is in heating operation, the outdoor heat exchanger is used as an evaporator, the temperature of the evaporator is low, and when the temperature is lower than zero and the outdoor environment has certain humidity, the outdoor heat exchanger can frost; the frosting of outdoor heat exchanger can lead to heat exchanger heat transfer performance variation, and the circulation of air is obstructed, and unit heating capacity variation can appear not having heating effect even blowing cold wind phenomenon when serious, leads to user experience poor or arouses the customer complains even.
Therefore, when the unit heats, the defrosting device can timely defrost the unit according to the judgment of conditions such as the unit running state and the like so as to ensure the heating effect of the unit.
When the existing air conditioning unit operates in a defrosting mode, the direction is changed by a four-way valve, the refrigeration operation mode is switched, an indoor heat exchanger is used as an evaporator, an outdoor heat exchanger is used as a condenser, and a frost layer is melted by heat dissipated by condensation of the condenser. As such, during defrosting, since the indoor heat exchanger is an evaporator, it may cause the indoor ambient temperature to fluctuate, bringing an uncomfortable experience to the user.
Aiming at the problem that the indoor environment temperature fluctuates during defrosting operation in the prior art, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a defrosting control method and device for ensuring continuous heating and a multi-split system, and aims to solve the problem that the indoor environment temperature fluctuates during defrosting operation in the prior art.
In order to solve the technical problem, the invention provides a defrosting control method, wherein the method comprises the following steps: when the system needs defrosting, determining the number M of the current heating operation modules; comparing the number M of the heating operation modules with the total number N of the system modules; selecting a corresponding defrosting control strategy according to the comparison result so as to control the module to be defrosted to enter a defrosting state; wherein, at least, it is ensured that a module in the system is still in heating operation.
Further, according to the comparison result, selecting a corresponding defrosting control strategy to control the module to be defrosted to enter a defrosting state, including:
if M is less than N, determining a shutdown module in the system, determining the total rated capacity of the shutdown module and the total rated capacity of the module needing defrosting, and comparing; determining a corresponding defrosting control strategy according to the comparison result so as to control a module needing defrosting to enter a defrosting state;
and if the M is equal to the N, controlling the module needing defrosting to enter a defrosting state according to the corresponding defrosting control strategy.
Further, if M is equal to N, controlling a module to be defrosted to enter a defrosting state according to a corresponding defrosting control strategy, including:
setting … … mth defrosting module combination of the first defrosting module combination and the second defrosting module combination; wherein, include a module at least in every module combination of changing frosts, every module combination of changing frosts all satisfies the preset condition: the total rated capacity of the defrosting module combination is less than or equal to (the total rated capacity of the other modules-the total capacity of the current operation of the system);
sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state;
and the other modules for controlling the non-defrosting state continuously maintain the heating operation.
Further, after the remaining modules controlling the non-defrosting state continue to maintain the heating state, the method further includes: the capacity output sum of the heating operation module is equal to the total rated capacity of the module in the defrosting state plus the current operation capacity of the system, and the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
Further, the method further comprises: and if no defrosting module combination can meet the preset condition, controlling each module to sequentially enter a defrosting state from small to large according to the output capacity.
Further, determining a corresponding defrosting control strategy according to the comparison result so as to control a module needing defrosting to enter a defrosting state, wherein the defrosting control strategy comprises the following steps:
if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the module to be defrosted, controlling the module to be defrosted to synchronously enter a defrosting state;
if the total rated capacity of the shutdown module is less than the total rated capacity of the defrosting-needed module, setting … … th defrosting module combinations of a first defrosting module combination and a second defrosting module combination; sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state; each defrosting module combination needs to meet the following requirements: the total rated capacity of each defrosting module combination is less than or equal to the total rated capacity of the shutdown module; otherwise, the first and second … … mth defrosting module combinations are defined in sequence from small to large according to the rated capacity of each module.
Further, after determining a corresponding defrosting control strategy according to the comparison result to control a module to be defrosted to enter a defrosting state, the method further comprises:
if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the defrosting module, controlling the shutdown module to start to operate according to the capacity requirement of the shutdown module; the sum of the capacity outputs of the shutdown modules is n times of the total rated capacity of the defrosting-needed module, and n is more than 0; the maximum capacity output of the shutdown module does not exceed the total rated capacity of the shutdown module.
Further, after determining a corresponding defrosting control strategy according to the comparison result to control a module to be defrosted to enter a defrosting state, the method further comprises:
if the total rated capacity of the shutdown module is less than the total rated capacity of the defrosting-needed module, controlling the shutdown module to start to perform heating operation; the sum of the capacity outputs of the heating operation modules is n times of the total rated capacity of the defrosting-needed module, and n is more than 0; the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
Further, entering a defrosting state is realized at least by the following steps: the control module is switched to a refrigeration state, the throttling component operates according to the refrigeration state, and the indoor unit operates normally for heating; controlling the four-way valve to reverse, and operating the compressor according to a preset target defrosting operation frequency; adjusting the frequency of the fan according to the high pressure; and adjusting the opening of the flow adjusting device according to the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator.
Further, according to high pressure adjustment fan frequency, include: when the high voltage exceeds a preset value, controlling the fan to operate according to the initial frequency; then, the operating frequency of the fan is determined by the following formula: the operating frequency is equal to the initial frequency + (high voltage — the preset value).
Further, adjusting the opening degree of the flow adjusting device according to the gas-liquid separator inlet pipe temperature and the gas-liquid separator outlet pipe temperature comprises:
if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are not less than a first preset value, controlling the opening of the flow regulating device to increase;
if the second preset value is smaller than the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator is smaller than the first preset value, controlling the opening degree of the flow regulating device to be kept unchanged;
and if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are less than or equal to a second preset value, controlling the opening degree of the flow regulating device to be reduced.
Further, after selecting a corresponding defrosting control strategy according to the comparison result to control the module to be defrosted to enter a defrosting state, the method further comprises: and after defrosting is finished, controlling the module entering the defrosting state to recover heating operation.
The invention also provides a defrosting control device, wherein the device comprises: the calculation module is used for confirming the number M of the current heating operation modules when the system needs defrosting; the comparison module is used for comparing the number M of the heating operation modules with the total number N of the system modules; the processing module is used for selecting a corresponding defrosting control strategy according to the comparison result so as to control the module needing defrosting to enter a defrosting state; wherein, at least, it is ensured that a module in the system is still in heating operation.
The invention also provides a multi-split system which is characterized by comprising the defrosting control device; the multi-split system is formed by connecting a plurality of outdoor units in parallel.
The present invention also provides a computer-readable storage medium having stored thereon a computer program characterized in that the program, when executed by a processor, implements the above-described defrosting control method.
By applying the technical scheme of the invention, the air conditioning system can continuously heat and quickly defrost, and the problems that the indoor environment temperature fluctuates frequently and even cold air is blown due to frequent frosting and defrosting when the unit operates in certain environments (such as winter in cold and humid areas) are solved. Guarantee that the unit changes the white operation period, indoor ambient temperature remains stable, guarantees that heat pump set indoor set is continuously heated during changing the white operation period, guarantees that the user uses the travelling comfort, gives the optimal use experience of user.
Drawings
FIG. 1 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system heating operation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a system defrosting operation according to an embodiment of the invention;
fig. 4 is a block diagram of a defrosting control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a defrosting control method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S101, when the system needs defrosting, confirming the number M of the current heating operation modules;
step S102, comparing the number M of heating operation modules with the total number N of the system modules;
s103, selecting a corresponding defrosting control strategy according to the comparison result so as to control a module needing defrosting to enter a defrosting state; wherein, at least, it is ensured that a module in the system is still in heating operation.
It should be noted that the system mentioned in this embodiment is a multi-split system formed by connecting a plurality of outdoor units in parallel, and the module mentioned in this embodiment is an outdoor unit set.
Through this embodiment, guarantee that organic unit still heats when the system changes frost, can realize that air conditioning system continuously heats, changes frost fast, guarantees that unit changes the white operation period, and indoor ambient temperature remains stable, guarantees that heat pump set indoor set continuously heats during changing the white operation period, guarantees that the user uses the travelling comfort, experiences for the optimal use of user.
In this embodiment, if the comparison result between the number M of the heating operation modules and the total number N of the system modules is different, different defrosting control strategies are adopted.
1) If M < N, it indicates that there are one or more shutdown modules in the system, i.e. the current non-heating operation module is in a shutdown state, and is called a shutdown module. Then, determining the total rated capacity of the shutdown module and the total rated capacity of the defrosting module, and comparing; and determining a corresponding defrosting control strategy according to the comparison result so as to control the module needing defrosting to enter a defrosting state. In particular, the amount of the solvent to be used,
a. and if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the module to be defrosted, controlling the module to be defrosted to synchronously enter a defrosting state. Meanwhile, the shutdown control module is started to operate according to the capacity requirement; the sum of the output capacities of the shutdown modules is n times of the total rated capacity of the defrosting module, and n is more than 0; the maximum capacity output of the shutdown module does not exceed the total rated capacity of the shutdown module.
After or at the same time, controlling the shutdown module to start operation according to the capacity requirement of the shutdown module; the sum of the output capacities of the shutdown modules is n times of the total rated capacity of the defrosting module, and n is more than 0; the maximum capacity output of the shutdown module does not exceed the total rated capacity of the shutdown module.
b. If the total rated capacity of the shutdown module is less than the total rated capacity of the defrosting-needed module, setting … … th defrosting module combinations of the first defrosting module combination and the second defrosting module combination; sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state; each defrosting module combination needs to meet the following requirements: the total rated capacity of each defrosting module combination is less than or equal to the total rated capacity of the shutdown module. Otherwise, the first and second … … mth defrosting module combinations are defined in sequence from small to large according to the rated capacity of each module.
After or at the same time, controlling the shutdown module to start up to carry out heating operation; the sum of the outputs of the capacities of the heating operation modules is n times of the total rated capacity of the defrosting module, and n is more than 0; the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
2) And if the M is equal to the N, controlling the module needing defrosting to enter a defrosting state according to a first defrosting control strategy. In particular, the amount of the solvent to be used,
a. setting … … mth defrosting module combination of the first defrosting module combination and the second defrosting module combination; wherein, include a module at least in every module combination of changing frosts, every module combination of changing frosts all satisfies the preset condition: the total rated capacity of the defrosting module combination is less than or equal to (the total rated capacity of the other modules-the total capacity of the current operation of the system);
b. sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state;
c. and the other modules for controlling the non-defrosting state continuously maintain the heating operation. The capacity output sum of the heating operation module is equal to the total rated capacity of the module in the defrosting state plus the current operation capacity of the system, and the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
It should be noted that, if no combination of the defrosting modules can meet the preset condition, each module is controlled to sequentially enter the defrosting state from the small output capacity to the large output capacity. The defrosting requirement of the system can be met.
For the embodiment, entering the defrosting state can be realized at least by the following means:
1. the control module is switched to a refrigeration state, the throttling component operates according to the refrigeration state, and the indoor unit operates normally for heating.
2. And controlling the four-way valve to reverse, and operating the compressor according to a preset target defrosting operation frequency.
3. Adjusting the frequency of the fan according to the high pressure; in particular, the amount of the solvent to be used,
when the high voltage exceeds a preset value, controlling the fan to operate according to the initial frequency; when the high voltage does not exceed the preset value, the running frequency of the fan is 0; then, the operating frequency of the fan is determined by the following formula: the operating frequency is equal to the initial frequency + (high voltage — preset value).
4. And adjusting the opening of the flow adjusting device according to the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator. In particular, the amount of the solvent to be used,
if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are not less than a first preset value, controlling the opening of the flow regulating device to increase;
if the second preset value is smaller than the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator is smaller than the first preset value, controlling the opening degree of the flow regulating device to be kept unchanged;
and if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are less than or equal to a second preset value, controlling the opening of the flow regulating device to be reduced.
For the opening degree adjusting range of the flow adjusting device, there may be a corresponding relationship between the opening degree adjusting range and the inlet pipe temperature of the gas-liquid separator, and more specifically, there may be a corresponding relationship between the difference between the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator and the adjusting range.
After defrosting is finished, the module which enters the defrosting state is controlled to recover heating operation, and continuous heat supply of the unit is ensured.
By the technical scheme, the system can continuously heat while defrosting quickly, and the problems that the indoor environment temperature fluctuates frequently and even cold air is blown due to frequent frosting and defrosting when the unit operates in certain environments (such as winter in cold and humid areas) are solved. Guarantee that the unit changes the white operation period, indoor ambient temperature remains stable, guarantees that heat pump set indoor set is continuously heated during changing the white operation period, guarantees that the user uses the travelling comfort, gives the optimal use experience of user.
Example 2
Fig. 2 is a schematic diagram of a heating operation of the system according to an embodiment of the present invention, and as shown in fig. 2, the system is schematically illustrated by taking two modules as an example, and when the system is in a heating mode, both modules are operated in a heating state. Fig. 3 is a schematic diagram of defrosting operation of the system according to the embodiment of the invention, as shown in fig. 3, one module in the system is switched to a defrosting state, and the other module is still in a heating state. That is, when the system needs to be operated in a defrosting mode, at least one outdoor unit in the system is operated in a defrosting mode, and the other outdoor units are kept in heating operation. A part of high-temperature refrigerant of the outdoor unit in heating operation flows to the outdoor unit in defrosting operation, and a part of high-temperature refrigerant flows to the indoor unit for continuous heating. The refrigerant flowing to the outdoor unit in defrosting operation is throttled and depressurized by the flow regulating device and then compressed by the compressor, so that the refrigerant is used for defrosting of the unit. Therefore, continuous heating during the defrosting period of the system is guaranteed, the indoor temperature is guaranteed to be stable, and the user experience is improved.
The defrosting control scheme of the basic module (i.e. one unit module) in the embodiment is as follows:
if the unit detects that defrosting is needed, after the unit enters defrosting control, the unit single components are controlled as follows:
reversing a four-way valve, and switching a unit into a refrigeration running mode when the four-way valve is in a power-off state;
adjusting the compressor to a target defrosting operation frequency to operate, wherein the target defrosting operation frequency is a preset value;
thirdly, controlling the frequency of the fan according to high pressure, when the high pressure is higher than a preset value X1, starting the fan to run, wherein the initial running frequency is M, and then controlling the running frequency according to the high pressure, and the running frequency of the fan is M + (Ph-X1); otherwise, the frequency of the fan is 0; ph is high pressure;
controlling the flow regulating device according to the temperature of an inlet pipe and an outlet pipe of the gas-liquid separator, and opening the flow regulating device to increase the flow if the temperature of the inlet pipe of the gas-liquid separator and the temperature of the outlet pipe of the gas-liquid separator is more than or equal to A ℃; if the temperature is lower than B DEG C and lower than A DEG C, the flow regulating device keeps the current opening and the current flow; if [ the inlet pipe temperature of the gas-liquid separator-the outlet pipe temperature of the gas-liquid separator ] is less than or equal to B ℃, the flow regulating device is turned off, and the flow is reduced; the opening degree of the flow regulating device is regulated within a preset range [ Y1, Y2 ].
It should be noted that, the opening degree of the flow regulating device is controlled according to the temperature of the inlet and outlet pipes of the gas-liquid separator, so as to control the refrigerant flow, and avoid that too much refrigerant flows into the gas-liquid separator, so that a small flow flows to the indoor unit, thereby affecting the heating effect of the indoor unit or causing the defrosting module to malfunction.
The indoor unit operates according to normal control.
And sixthly, the throttling component operates according to refrigeration control.
Seventhly, after the defrosting of the defrosting module is finished, heating operation is recovered; and all modules normally control and operate according to the capacity distribution.
The order of execution of the several control operations described above is not limited.
The system consists of multiple modules (or 2 modules or 3 modules or 4 modules), the sequence of basic modules of the system (module 1, module 2, module 3 and module 4) is predefined, and the system is divided into the following control methods for defrosting operation according to the number of the basic modules in operation in the system and the detected number of the basic modules needing defrosting:
the systematic defrosting control scheme is as follows:
when N basic modules exist in the system, wherein M basic modules are in a heating operation state, and when the basic modules in the system need defrosting, the following judgment is carried out:
1) if M is less than N, judging the relation between the total rated capacity of the defrosting-needed module and the total rated capacity of the shutdown module;
if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the defrosting-needed module, all the defrosting-needed modules synchronously enter defrosting, the defrosting modules run according to the defrosting control of the basic module, the shutdown module in the system starts running according to capacity requirements, the sum of the capacity outputs of the shutdown modules is n times (n is larger than 0) of the total rated capacity of the defrosting modules, and the maximum output does not exceed the total rated capacity of the shutdown modules; and other non-defrosting heating operation modules are normally controlled according to capacity requirements. When the defrosting module is combined for defrosting operation, the shutdown module in the system is started to operate according to the capacity requirement, the sum of the capacity outputs of the shutdown module is n times (n is more than 0) of the total rated capacity of the basic module which is defrosting, and the maximum output does not exceed the total rated capacity of the shutdown module.
If the total rated capacity of the shutdown module is less than the total rated capacity of the module to be defrosted, defining a first defrosting modular combination, a second defrosting modular combination and a mth defrosting modular combination (the number of basic modules contained in the modular combinations can be 1-N-1), wherein the total rated capacity of the defrosting modules contained in each defrosting modular combination is less than or equal to the total rated capacity of all shutdown modules; all the defrosting modules are combined to comprise all basic modules needing defrosting; defrosting is sequentially carried out according to the combination sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination, and after the former defrosting module combination exits defrosting, the next defrosting module combination enters defrosting; the basic modules in the same defrosting module combination enter defrosting operation at the same time; when the defrosting module is combined for defrosting operation, the shutdown module is controlled to start for heating operation; the sum of the capacity outputs of the heating operation modules is n times of the total rated capacity of the defrosting module, and n is more than 0; the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
2) If M is equal to N, the defrosting control is carried out as follows:
defining a first defrosting module combination, a second defrosting module combination and an m-th defrosting module combination, wherein the total rated capacity of the first defrosting module combination is less than or equal to (the total rated capacity of the rest modules-the total current operation capacity of the system), during defrosting, sequentially entering defrosting according to the sequence of the first, second and third … … m-th defrosting module combinations, and after the previous defrosting module combination exits defrosting, entering defrosting by the next defrosting module combination; the other modules in non-defrosting operation continue to maintain heating operation, the sum of the capacity outputs of the heating operation modules is the sum of the total rated capacity of the module in defrosting and the current operation capacity of the system, and the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module;
and if the first defrosting module combination does not exist, the basic modules enter defrosting in sequence from small to large.
Example 3
Corresponding to the defrosting control method introduced in fig. 1, the present embodiment provides a defrosting control device, as shown in the block diagram of the structure of the defrosting control device shown in fig. 4, the device includes:
the calculating module 10 is used for confirming the number M of the current heating operation modules when the system needs defrosting;
the comparison module 20 is used for comparing the number M of the heating operation modules with the total number N of the system modules;
the processing module 30 is configured to select a corresponding defrosting control strategy according to the comparison result, so as to control the module to be defrosted to enter a defrosting state; wherein, at least, it is ensured that a module in the system is still in heating operation.
The specific implementation of the defrosting control device in this embodiment is the same as that in embodiment 1, and is not described herein again.
The defrosting control device can execute the method provided by the embodiment of the invention and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
Through this embodiment, guarantee that organic unit still heats when the system changes frost, can realize that air conditioning system continuously heats, changes frost fast, guarantees that unit changes the white operation period, and indoor ambient temperature remains stable, guarantees that heat pump set indoor set continuously heats during changing the white operation period, guarantees that the user uses the travelling comfort, experiences for the optimal use of user.
The embodiment also provides a multi-split system, which comprises the defrosting control device, so that continuous heating is ensured when the system is defrosted. The multi-split system is formed by connecting a plurality of outdoor units in parallel.
Example 4
An embodiment of the present invention provides a non-volatile computer storage medium, where a computer-executable instruction is stored in the computer storage medium, and the computer-executable instruction may execute the defrosting control method in any of the above method embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A defrosting control method characterized in that the method comprises:
when the system needs defrosting, determining the number M of the current heating operation modules;
comparing the number M of the heating operation modules with the total number N of the system modules;
selecting a corresponding defrosting control strategy according to the comparison result so as to control the module to be defrosted to enter a defrosting state; wherein, at least ensuring that a module in the system is still in heating operation; the system is a multi-split system formed by connecting a plurality of outdoor units in parallel, and the module is an outdoor unit set;
wherein, select corresponding defrosting control strategy according to the comparison result to the module that control needs to be defrosted enters into the state of defrosting, includes:
if M is less than N, determining a shutdown module in the system, determining the total rated capacity of the shutdown module and the total rated capacity of the module needing defrosting, and comparing; determining a corresponding defrosting control strategy according to the comparison result so as to control a module needing defrosting to enter a defrosting state;
if the M is equal to N, controlling a module needing defrosting to enter a defrosting state according to a corresponding defrosting control strategy; the defrosting control strategy under the condition that M is less than N is different from the defrosting control strategy under the condition that M is equal to N.
2. The method according to claim 1, wherein if M ═ N, then the module to be defrosted is controlled to enter a defrosting state according to a corresponding defrosting control strategy, comprising:
setting … … mth defrosting module combination of the first defrosting module combination and the second defrosting module combination; wherein, include a module at least in every module combination of changing frosts, every module combination of changing frosts all satisfies the preset condition: the total rated capacity of the defrosting module combination is less than or equal to (the total rated capacity of the other modules-the total capacity of the current operation of the system);
sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state;
and the other modules for controlling the non-defrosting state continuously maintain the heating operation.
3. The method of claim 2, wherein after the remaining modules that control the non-defrost state continue to maintain the heating operation, further comprising:
the capacity output sum of the heating operation module is equal to the total rated capacity of the module in the defrosting state plus the current operation capacity of the system, and the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
4. The method according to claim 2, wherein if M ═ N, the module to be defrosted is controlled to enter a defrosting state according to a corresponding defrosting control strategy, comprising:
and if no defrosting module combination can meet the preset condition, controlling each module to sequentially enter a defrosting state from small to large according to the output capacity.
5. The method according to claim 1, wherein determining a corresponding defrosting control strategy according to the comparison result to control a module to be defrosted to enter a defrosting state comprises:
if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the module to be defrosted, controlling the module to be defrosted to synchronously enter a defrosting state;
if the total rated capacity of the shutdown module is less than the total rated capacity of the defrosting-needed module, setting … … th defrosting module combinations of a first defrosting module combination and a second defrosting module combination; sequentially entering a defrosting state according to the sequence of the first defrosting module combination and the second defrosting module combination … …, namely the mth defrosting module combination; after the former defrosting module combination exits the defrosting state, the next defrosting module combination enters the defrosting state; wherein, every combination of defrosting module needs to satisfy: the total rated capacity of each defrosting module combination is less than or equal to the total rated capacity of the shutdown module; otherwise, the first and second … … mth defrosting module combinations are defined in sequence from small to large according to the rated capacity of each module.
6. The method according to claim 1, wherein after determining a corresponding defrosting control strategy according to the comparison result to control the module to be defrosted to enter the defrosting state, the method further comprises:
if the total rated capacity of the shutdown module is larger than or equal to the total rated capacity of the defrosting module, controlling the shutdown module to start to operate according to the capacity requirement of the shutdown module;
the sum of the capacity outputs of the shutdown modules is n times of the total rated capacity of the defrosting-needed module, and n is more than 0; the maximum capacity output of the shutdown module does not exceed the total rated capacity of the shutdown module.
7. The method according to claim 1, wherein after determining a corresponding defrosting control strategy according to the comparison result to control the module to be defrosted to enter the defrosting state, the method further comprises:
if the total rated capacity of the shutdown module is less than the total rated capacity of the defrosting-needed module, controlling the shutdown module to start to perform heating operation;
the sum of the capacity outputs of the heating operation modules is n times of the total rated capacity of the defrosting-needed module, and n is more than 0; the maximum capacity output of the heating operation module does not exceed the total rated capacity of the heating operation module.
8. The method of claim 1, wherein entering the defrost state is achieved by at least:
the control module is switched to a refrigeration state, the throttling component operates according to the refrigeration state, and the indoor unit operates normally for heating;
controlling the four-way valve to reverse, and operating the compressor according to a preset target defrosting operation frequency;
adjusting the frequency of the fan according to the high pressure;
adjusting the opening of the flow adjusting device according to the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator; the flow regulating device is arranged between the indoor unit and the four-way valve of each module.
9. The method of claim 8, wherein adjusting the fan frequency based on the high pressure comprises:
when the high voltage exceeds a preset value, controlling the fan to operate according to the initial frequency;
then, the operating frequency of the fan is determined by the following formula: the operating frequency is equal to the initial frequency + (high voltage — the preset value).
10. The method of claim 8, wherein adjusting the opening of the flow regulating device based on the gas-liquid separator inlet pipe temperature and the gas-liquid separator outlet pipe temperature comprises:
if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are not less than a first preset value, controlling the opening of the flow regulating device to increase;
if the second preset value is smaller than the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator is smaller than the first preset value, controlling the opening degree of the flow regulating device to be kept unchanged;
and if the inlet pipe temperature of the gas-liquid separator and the outlet pipe temperature of the gas-liquid separator are less than or equal to a second preset value, controlling the opening degree of the flow regulating device to be reduced.
11. The method according to claim 1, wherein after selecting a corresponding defrosting control strategy according to the comparison result to control the module to be defrosted to enter the defrosting state, the method further comprises:
and after defrosting is finished, controlling the module entering the defrosting state to recover heating operation.
12. A defrosting control apparatus characterized in that the apparatus comprises:
the calculation module is used for confirming the number M of the current heating operation modules when the system needs defrosting;
the comparison module is used for comparing the number M of the heating operation modules with the total number N of the system modules;
the processing module is used for selecting a corresponding defrosting control strategy according to the comparison result so as to control the module needing defrosting to enter a defrosting state; the method is specifically used for: if M is less than N, determining a shutdown module in the system, determining the total rated capacity of the shutdown module and the total rated capacity of the module needing defrosting, and comparing; determining a corresponding defrosting control strategy according to the comparison result so as to control a module needing defrosting to enter a defrosting state; if the M is equal to N, controlling a module needing defrosting to enter a defrosting state according to a corresponding defrosting control strategy; wherein, at least ensuring that a module in the system is still in heating operation; the system is a multi-split system formed by connecting a plurality of outdoor units in parallel, and the module is an outdoor unit set;
the defrosting control strategy under the condition that M is less than N is different from the defrosting control strategy under the condition that M is equal to N.
13. A multiple on-line system, comprising: the defrosting control unit of claim 12.
14. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 11.
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| CN110986284A (en) * | 2019-12-12 | 2020-04-10 | 珠海格力电器股份有限公司 | Defrosting control method and device capable of continuously heating and air conditioner |
| CN112161378B (en) * | 2020-09-07 | 2022-06-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Outdoor unit defrosting control method and device and air conditioner |
| CN112212467B (en) * | 2020-11-02 | 2021-11-02 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioning unit |
| CN112484238B (en) * | 2020-11-16 | 2021-11-23 | 珠海格力电器股份有限公司 | Defrosting control method and device, multi-module unit and heating and ventilation equipment |
| CN112539520B (en) * | 2020-12-17 | 2021-10-22 | 珠海格力电器股份有限公司 | Defrosting control method and device and multi-split air conditioner |
| CN112539521B (en) * | 2020-12-21 | 2022-02-22 | 珠海格力电器股份有限公司 | Air conditioner multi-split air conditioner and defrosting control method and device and storage medium thereof |
| CN112984595B (en) * | 2021-03-10 | 2022-04-19 | 青岛海信日立空调系统有限公司 | Ground heating unit |
| CN115751612A (en) * | 2021-09-02 | 2023-03-07 | 广东美的暖通设备有限公司 | Defrosting control method and device for multi-split air conditioning system |
| CN114135988A (en) * | 2021-11-15 | 2022-03-04 | 珠海格力电器股份有限公司 | Control method and device of modular air conditioning system, controller and air conditioning system |
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| CN104180570A (en) * | 2014-07-30 | 2014-12-03 | 珠海格力电器股份有限公司 | Defrosting control method and system of heat pump air-conditioning unit |
| JP6119811B2 (en) * | 2015-08-18 | 2017-04-26 | ダイキン工業株式会社 | Refrigeration equipment |
| CN109520031A (en) * | 2018-12-20 | 2019-03-26 | 珠海格力电器股份有限公司 | The air-conditioning system of defrost and heating is carried out simultaneously |
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