CN117588829A - Defrosting control method and device for air conditioning unit and air conditioning unit - Google Patents
Defrosting control method and device for air conditioning unit and air conditioning unit Download PDFInfo
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- CN117588829A CN117588829A CN202311521320.7A CN202311521320A CN117588829A CN 117588829 A CN117588829 A CN 117588829A CN 202311521320 A CN202311521320 A CN 202311521320A CN 117588829 A CN117588829 A CN 117588829A
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- 238000010257 thawing Methods 0.000 title claims abstract description 213
- 238000004378 air conditioning Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000002699 waste material Substances 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
- 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method and device for an air conditioning unit and the air conditioning unit, wherein the method comprises the following steps: detecting whether defrosting is needed by an air conditioning unit; detecting outdoor environment parameters and whether an unopened outdoor unit exists or not when defrosting is needed; determining a defrosting mode according to outdoor environment parameters and whether an unopened outdoor unit exists or not, and controlling an air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode. The invention solves the problem of large indoor ring temperature fluctuation caused by reverse defrosting of the air conditioning unit in the prior art, and improves the comfort of the air conditioning unit and the defrosting energy consumption of the air conditioning unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device for an air conditioner unit and the air conditioner unit.
Background
With the advent of variable frequency air source heat pump, variable frequency air source heat pump units can be commonly used for heating projects in the future, but the variable frequency air source heat pump still has the problem of frosting of winter units, and the occurrence of frost layers can influence the heating capacity of the air source heat pump, so that the heating duration is short and the defrosting is frequent.
The existing defrosting method is generally reverse circulation reversing defrosting, the flow direction of the refrigerant is changed through reversing of a four-way valve, and the air source heat pump absorbs heat from the indoor space to defrost the outdoor unit. But this technique causes a serious drop in room temperature, affecting indoor comfort.
Aiming at the problem of large indoor ring temperature fluctuation caused by reverse defrosting of an air conditioning unit in the related art, no effective solution is proposed at present.
Disclosure of Invention
The invention provides a defrosting control method and device for an air conditioning unit and the air conditioning unit, and aims to at least solve the problem that in the prior art, indoor ring temperature fluctuation is large due to reverse defrosting of the air conditioning unit.
In order to solve the above technical problem, according to an aspect of the embodiments of the present invention, there is provided a defrosting control method for an air conditioning unit, the air conditioning unit including a plurality of groups of outdoor units connected in parallel, the method including: detecting whether defrosting is needed by an air conditioning unit; detecting outdoor environment parameters and whether an unopened outdoor unit exists or not when defrosting is needed; determining a defrosting mode according to outdoor environment parameters and whether an unopened outdoor unit exists or not, and controlling an air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
Further, before detecting whether the air conditioning unit needs defrosting, the method further comprises: determining the number of open groups of the outdoor unit; and controlling the operation of the outdoor unit according to the opening group.
Further, determining the number of open groups of the outdoor unit includes: acquiring operation parameters of an air conditioning unit, and determining the required group number of the outdoor unit according to the operation parameters; detecting outdoor environment parameters, and judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters; and determining the number of the opening groups of the outdoor unit according to the judging result and the number of the demand groups.
Further, determining the number of open groups of the outdoor unit according to the judging result and the number of demand groups includes: when the outdoor environment does not reach the frosting state, determining the number of the opening groups of the outdoor unit as the number of the demand groups; when the outdoor environment reaches the frosting state, further judging whether the required group number reaches the preset maximum group number, and when the required group number reaches the preset maximum group number, determining that the opening group number of the outdoor unit is the preset maximum group number, otherwise, determining that the opening group number of the outdoor unit is the required group number.
Further, the preset maximum group number is the total group number of the outdoor units minus the first preset value, and the preset maximum group number is used for ensuring that the outdoor units always maintain the operation of the heating mode during defrosting.
Further, the outdoor environment parameters include at least: outdoor temperature, outdoor humidity; judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters, including: calculating dew point temperature according to the outdoor temperature and the outdoor humidity; and when the difference between the dew point temperature and the outdoor temperature is smaller than the preset temperature difference and the outdoor humidity is larger than the preset humidity, determining that the outdoor environment reaches a frosting state.
Further, the outdoor environment parameter at least includes an outdoor environment temperature, and determining a defrosting mode according to the outdoor environment parameter and whether there is an unopened outdoor unit includes: judging whether the outdoor environment temperature is less than a preset temperature; if yes, determining that the defrosting mode is a forced defrosting mode; under the forced defrosting mode, the outdoor units defrost in turn; otherwise, determining a defrosting mode according to whether the outdoor unit which is not started exists.
Further, determining a defrosting mode according to whether there is an unopened outdoor unit includes: when an unopened outdoor unit exists, determining that a defrosting mode is a natural defrosting mode, wherein the unopened outdoor unit performs natural defrosting in turn in the natural defrosting mode, and a compressor of the outdoor unit executing natural defrosting is stopped and a fan keeps running; and when the outdoor unit which is not started does not exist, determining that the defrosting mode is a forced defrosting mode.
According to another aspect of the embodiment of the present invention, there is provided a defrosting control device for an air conditioning unit, the air conditioning unit including a plurality of groups of outdoor units connected in parallel, the device including: the triggering module is used for detecting whether the air conditioning unit needs defrosting; the detection module is used for detecting outdoor environment parameters and whether an unopened outdoor unit exists or not when defrosting is needed; the defrosting module is used for determining a defrosting mode according to outdoor environment parameters and whether an unopened outdoor unit exists or not, and controlling the air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
According to still another aspect of the embodiment of the present invention, there is provided an air conditioning unit including the defrosting control device of the air conditioning unit as described above.
According to yet another aspect of embodiments of the present invention, there is provided a storage medium containing computer executable instructions for performing an air conditioning unit defrosting control method as described above when executed by a computer processor.
According to the defrosting control scheme of the air conditioning unit, the defrosting mode is determined through the outdoor environment parameters and whether the outdoor unit is idle or not, and the air conditioning unit is controlled to execute the natural defrosting mode or the forced defrosting mode.
Drawings
FIG. 1 is a schematic view of an alternative configuration of an air conditioning unit according to an embodiment of the present invention;
FIG. 2 is an alternative flow chart of a method of controlling defrosting of an air conditioning unit according to an embodiment of the present invention;
FIG. 3 is another alternative flow chart of a method of controlling defrosting of an air conditioning unit according to an embodiment of the present invention;
fig. 4 is a block diagram showing an alternative construction of a defrosting control device for an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 this application 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, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the controllers in the embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish between controllers connected to different devices. For example, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller, without departing from the scope of embodiments of the invention.
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 phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The air conditioning unit can be a cold and hot double-source air source heat pump system, the system comprises a variable frequency air source heat pump unit, a variable frequency water pump and a circulating waterway system thereof, an electric regulating valve is arranged on a circulating pipeline of the system, and the switching of the system operation mode is realized through the data feedback of a temperature monitoring unit. Fig. 1 shows an alternative structural schematic diagram of the air conditioning unit, taking the schematic diagram as an example, the system divides all units into three groups by three valve groups, when the valve groups are opened, the corresponding responsible units are opened, and when the valve groups are closed, the corresponding responsible units are closed.
The main machine of the air conditioning system is generally configured according to the large cooling capacity requirement in summer, so that the number of units is larger than that of units in winter.
In a preferred embodiment 1 of the present invention, there is provided a defrosting control method of an air conditioning unit, which can be directly applied to the above air conditioning unit. Specifically, fig. 2 shows an alternative flow chart of the method, as shown in fig. 2, comprising the following steps S202-S206:
s202: detecting whether defrosting is needed by an air conditioning unit;
s204: detecting outdoor environment parameters and whether an unopened outdoor unit exists or not when defrosting is needed;
s206: determining a defrosting mode according to outdoor environment parameters and whether an unopened outdoor unit exists or not, and controlling an air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
In the above embodiment, a defrosting control scheme of an air conditioning unit is provided, a defrosting mode is determined according to outdoor environment parameters and whether an idle outdoor unit exists, and the air conditioning unit is controlled to execute a natural defrosting mode or a forced defrosting mode.
In a preferred embodiment of the present invention, before detecting whether defrosting is required for the air conditioning unit, the method further comprises: determining the number of open groups of the outdoor unit; and controlling the operation of the outdoor unit according to the opening group. Specifically, determining the number of open groups of the outdoor unit includes: acquiring operation parameters of an air conditioning unit, and determining the required group number of the outdoor unit according to the operation parameters; detecting outdoor environment parameters, and judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters; and determining the number of the opening groups of the outdoor unit according to the judging result and the number of the demand groups. Whether the frosting working condition is reached or not is firstly judged according to the real-time environment temperature, so that the number of the outdoor units is controlled, and the environment condition can be fully utilized to bring the unit capacity into play to the maximum.
Preferably, determining the number of open groups of the outdoor unit according to the determination result and the number of demand groups includes: when the outdoor environment does not reach the frosting state, determining the number of the opening groups of the outdoor unit as the number of the demand groups; at this time, the outdoor unit is not easy to frost, so that the unit needs are mainly satisfied. When the outdoor environment reaches the frosting state, further judging whether the required group number reaches the preset maximum group number, and when the required group number reaches the preset maximum group number, determining that the opening group number of the outdoor unit is the preset maximum group number, otherwise, determining that the opening group number of the outdoor unit is the required group number. The preset maximum group number is obtained by subtracting a first preset value from the total group number of the outdoor units, and is used for ensuring that the outdoor units always maintain the operation of a heating mode during defrosting. The first preset value is selectable by 1, so that a group of outdoor units can normally participate in the heating mode operation all the time, and defrosting and indoor requirements are met at the same time.
Optionally, the outdoor environment parameters include at least: outdoor temperature, outdoor humidity; judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters, including: calculating dew point temperature according to the outdoor temperature and the outdoor humidity; and when the difference between the dew point temperature and the outdoor temperature is smaller than the preset temperature difference and the outdoor humidity is larger than the preset humidity, determining that the outdoor environment reaches a frosting state. For example, during operation, the outdoor temperature T is monitored Outer part And the outdoor humidity phi, the air dew point temperature T is calculated according to the two values Dew Judging whether the outdoor air environment reaches a state of possible frosting: i.e. T Outer part And T is Dew The temperature difference of the temperature sensor is smaller than the set temperature of 4 ℃ (default of 4 ℃, and the temperature difference is actually adjustable, at the moment, the temperature difference of heat exchange of air inlet and outlet of the fin side of the default unit is 4 ℃), and the outdoor humidity phi is larger than the set value of 75% (default of 75%, and the actual adjustment). If the frosting condition is reached, in order to ensure that a group of outdoor units can normally run all the time in the natural defrosting process of the system, the number of the openable outdoor units of the system=the total number of the outdoor units of-1; if the frosting condition is not reached, the system may start the number of outdoor units = total required number of outdoor units.
In another preferred embodiment of the present invention, the outdoor environment parameter includes at least an outdoor environment temperature, and determining the defrosting mode according to the outdoor environment parameter and whether there is an unopened outdoor unit includes: judging whether the outdoor environment temperature is less than a preset temperature; if yes, determining that the defrosting mode is a forced defrosting mode; under the forced defrosting mode, the outdoor units defrost in turn; otherwise, determining a defrosting mode according to whether the outdoor unit which is not started exists. When an unopened outdoor unit exists, determining that a defrosting mode is a natural defrosting mode, wherein in the natural defrosting mode, idle outdoor units perform natural defrosting in turn, a compressor of the outdoor unit performing natural defrosting is stopped, and a fan keeps running; and when the outdoor unit which is not started does not exist, determining that the defrosting mode is a forced defrosting mode.
Monitoring whether the unit receives a defrosting signal or not, if not, keeping the unit running unchanged, and monitoring whether the unit has the defrosting signal or not again after a certain time (default 5 min) is kept; synchronously monitoring outdoor environment temperature, judging whether the outdoor temperature is greater than a set value 2 ℃ (default 2 ℃ and is actually adjustable) if a defrosting signal exists, judging whether an available idle outdoor unit exists if the outdoor temperature is more than 2 ℃, and starting a natural defrosting mode if the idle outdoor unit exists: and opening an idle valve group and an interlocking unit thereof, closing compressors of the 1 valve group requiring defrosting and the unit thereof, keeping a unit fan to continuously run, monitoring whether the defrosting of the unit corresponding to the closed valve group requiring defrosting is finished every 5min (actually adjustable), re-monitoring defrosting signals if the defrosting is finished, and continuing to naturally defrost if the defrosting is not finished. If the outdoor temperature is higher than 2 ℃ and no usable idle outdoor unit exists or the outdoor temperature is lower than 2 ℃, the system starts a forced defrosting mode, the units needing to be defrosted start the forced defrosting mode in turn, after every 5min (actually adjustable), whether all the units corresponding to the valve group are defrosted is detected, if so, whether defrosting signals exist is monitored again, and if not, defrosting is continued until defrosting is completed. The defrosting control is an energy-saving mode, controls the automatic switching between high-efficiency operation modes, combines natural defrosting for control, can effectively reduce the energy consumption of unit defrosting and the operation of a water pump, and further improves the comprehensive operation energy efficiency of the system.
The air source heat pump system is designed in groups through the valve groups, so that the group of units corresponding to each valve group can be turned on in turn, when outdoor environment in winter reaches a frosting working condition and outdoor temperature meets a certain condition, the valve groups are turned off in turn, a host machine of the air source heat pump system is assisted by an outdoor natural heat source and a fan to complete a natural defrosting process, compared with a conventional system, a natural defrosting mode can be increased, air heat is utilized for defrosting, energy consumption of the units and a water pump in defrosting is saved, and energy waste loss is reduced.
In addition, the system has low-frequency operation control, after the system opening command is executed, 1 valve group is opened, all the corresponding controlled machine groups are started, the operation frequency of the machine group compressor is monitored when the standby group is started to complete normal operation, whether the frequency is lower than the minimum limit frequency (default 25 HZ) is judged, if the frequency is lower than 25HZ, the system is kept unchanged, if the frequency is higher than 25HZ, whether all the openable valve groups are opened is monitored, if not, one of the idle valve groups and all the machine groups responsible for the idle valve groups are opened, and if all the openable valve groups are opened, the system keeps unchanged in the original operation mode. The above process defaults to 10min for one cycle and back and forth. According to the low-frequency operation control, all units are regulated according to the same low frequency, so that the COP of the units can be obviously improved, the mode in the prior art is to carry out loading and unloading after full loading, compared with the prior art, the scheme of the invention can ensure that most of the air source heat pump units in the system are operated in the low frequency band, and aiming at the frequency conversion unit, the COP of the units is high in a partial load state, the frosting probability is small during heating working conditions, the heating time of the units is prolonged, meanwhile, when the heat exchanger of the outdoor unit is in the frosting state, the frequency of the compressor and the circulating water pump is regulated, different amplitude reductions can cause the reduction of the frost layers of the heat exchanger of the outdoor unit to different degrees, and the larger amplitude reduction is, and the frosting inhibition effect is more obvious.
The invention solves the problem of large fluctuation of the ring temperature in the frosting room caused by an air source heat pump system in winter from the two dimensions of a system control strategy and system optimization under the condition of not modifying the configuration of a unit. The low-frequency operation of the unit is controlled, so that the frost formation probability of the unit in winter is effectively reduced, the heating time of the unit is prolonged, the energy efficiency of the system is improved, and the useless power consumption of defrosting and the discomfort caused by indoor temperature fluctuation are reduced. Through system optimization, a natural defrosting mode is realized, the unit is replaced by natural defrosting to forcedly defrost, and the defrosting power consumption of the unit and the influence on room temperature are reduced.
In a preferred embodiment 1 of the present invention, another method for controlling defrosting of an air conditioning unit is provided, specifically, fig. 3 shows an alternative flowchart of the method, and as shown in fig. 3, the method includes the following steps S301 to S320:
s301, starting up a system;
s302, a normal heating mode;
s303, firstly, a valve group is opened, and the machine group controlled by the valve group is fully opened;
s304, monitoring whether the compressor frequency is lower than the lowest operating frequency, if so, entering S307, otherwise entering S305;
s305, the openable valve group is fully opened, if yes, S307 is entered, otherwise S306 is entered;
s306, opening an idle valve group;
s307, keeping the running state of the system unchanged;
s308, judging T Outer part And T is Dew If the temperature difference is smaller than the set temperature and the relative humidity is larger than the set value, S309 is entered, otherwise S310 is entered;
s309: openable valve group number = total valve group number-1;
s310. number of openable valve groups = total number of required valve groups;
s311, periodically monitoring the system state;
s312, defrosting mode;
s313, monitoring a defrosting signal;
s314, if the outdoor temperature is greater than the set value, entering S306, otherwise entering S315;
s315, a valve group to be defrosted turns on a forced defrosting mode;
s316, judging whether the system has an idle valve group, if so, entering S317, otherwise, entering S316;
s317, 1 idle valve group is opened;
s318, closing 1 frosted valve group and opening a natural defrosting mode;
s319, monitoring whether defrosting of the valve group is finished, if yes, entering S313, otherwise entering S320;
and S320, continuing defrosting until the defrosting is finished.
After the system is started, 1 valve group is started, all the corresponding controlled machine groups are started, the running frequency of the compressor of the machine group is monitored when the starting of the standby group is completed and normal running is completed, whether the frequency is lower than the minimum limiting frequency (default 25 HZ), if the frequency is lower than 25HZ, the system is kept unchanged, if the frequency is higher than 25HZ, whether all the openable valve groups are started, if not, one of the idle valve groups and all the machine groups responsible for the idle valve groups are started, and if all the openable valve groups are started, the system keeps unchanged in the original running mode. The above process defaults to 10min for one cycle and back and forth.
Monitoring outdoor temperature T during operation Outer part And relative humidity phi, and calculating the air dew point temperature T according to the two values Dew Judging whether the outdoor air environment reaches a state of possible frosting: i.e. T Outer part And T is Dew The temperature difference of the air inlet and outlet heat exchange temperature difference of the fin side of the default unit is 4 ℃ and the relative humidity phi is more than 75% of the set value (default 75% and actual adjustable). If the frosting condition is reached, in order to ensure that a group of valve groups can normally operate all the time in the natural defrosting process of the system, the number of the valve groups which can be opened by the system=the total valve group number-1; if the frosting condition is not reached, the system may open valve group number = total required valve group number.
Monitoring whether the unit has a defrosting signal or not, if not, keeping the unit running unchanged, and monitoring whether the unit has the defrosting signal or not again after a certain time (default 5 min) is kept; synchronously monitoring outdoor environment temperature, judging whether the outdoor temperature is greater than a set value of 2 ℃ (default of 2 ℃ and actual adjustment) if a defrosting signal exists, judging whether an available idle valve bank exists if the outdoor temperature is greater than 2 ℃, and starting a natural defrosting mode if the idle valve bank exists: and opening an idle valve group and an interlocking unit thereof, closing compressors of the 1 valve group requiring defrosting and the unit thereof, keeping a unit fan to continuously run, monitoring whether the defrosting of the unit corresponding to the closed valve group requiring defrosting is finished every 5min (actually adjustable), re-monitoring defrosting signals if the defrosting is finished, and continuing to naturally defrost if the defrosting is not finished. If the outdoor temperature is higher than 2 ℃ and no idle valve bank is available or the outdoor temperature is lower than 2 ℃, the system starts a forced defrosting mode, the units needing to be defrosted start the forced defrosting mode in turn, whether all the units corresponding to the valve bank are defrosted is detected after every 5min (actually adjustable), if yes, whether defrosting signals exist is monitored again, and if not, defrosting is continued until defrosting is completed.
The invention utilizes the redundant units to integrally reduce the frequency of the variable-frequency air source heat pump unit, thereby reducing the frosting degree of the unit, and the larger the reduced amplitude is, the better the frost inhibiting effect is, and the more the heating time is increased. The air source heat pump system is designed in groups through the valve groups, so that the group of units corresponding to each valve group can be turned on in turn, when outdoor environment in winter reaches frosting working conditions and outdoor temperature meets certain conditions, the valve groups are turned off in turn, and a host machine of the air source heat pump system is assisted by an outdoor natural heat source and a fan to complete a natural frosting process, so that the water outlet temperature of the system is not influenced, the indoor temperature is not suddenly lowered, and the comfort level of a human body is not influenced. And the high-efficiency operation modes are controlled to be automatically switched, and the natural defrosting is combined to control, so that the comprehensive operation energy efficiency of the system is further improved.
Example 2
Based on the method for controlling defrosting of an air conditioning unit provided in the above embodiment 1, in a preferred embodiment 2 of the present invention, there is further provided an air conditioning unit defrosting control device, specifically, fig. 4 shows an optional block diagram of the device, and as shown in fig. 4, the device includes:
a triggering module 402, configured to detect whether defrosting is required for the air conditioning unit;
the detection module 404 is connected with the triggering module 402 and is used for detecting outdoor environment parameters and whether an unopened outdoor unit exists when defrosting is needed;
the defrosting module 406 is connected with the detection module 404, and is used for determining a defrosting mode according to outdoor environment parameters and whether an unopened outdoor unit exists or not, and controlling the air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
In the above embodiment, a defrosting control scheme of an air conditioning unit is provided, a defrosting mode is determined according to outdoor environment parameters and whether an idle outdoor unit exists, and the air conditioning unit is controlled to execute a natural defrosting mode or a forced defrosting mode.
The device also comprises an opening module, a control module and a control module, wherein the opening module is used for determining the number of opening groups of the outdoor unit before detecting whether defrosting is needed by the air conditioning unit; and the operation module is used for controlling the operation of the outdoor unit according to the opening group number.
The opening module comprises: the acquisition sub-module is used for acquiring the operation parameters of the air conditioning unit and determining the required group number of the outdoor unit according to the operation parameters; the first judging submodule is used for detecting outdoor environment parameters and judging whether the outdoor environment reaches a frosting state or not according to the outdoor environment parameters; and the determining submodule is used for determining the opening group number of the outdoor unit according to the judging result and the demand group number.
The determining submodule includes: the first determining unit is used for determining the number of the opening groups of the outdoor unit as the number of the demand groups when the outdoor environment does not reach the frosting state; the second determining unit is used for further judging whether the required group number reaches a preset maximum group number when the outdoor environment reaches a frosting state, determining that the opening group number of the outdoor unit is the preset maximum group number when the required group number reaches the preset maximum group number, and otherwise determining that the opening group number of the outdoor unit is the required group number.
The preset maximum group number is obtained by subtracting a first preset value from the total group number of the outdoor units, and is used for ensuring that the outdoor units always maintain the operation of a heating mode during defrosting.
Preferably, the outdoor environment parameters include at least: outdoor temperature, outdoor humidity; the first judgment submodule includes: a calculation unit for calculating a dew point temperature according to an outdoor temperature and an outdoor humidity; and the third determining unit is used for determining that the outdoor environment reaches a frosting state when the difference between the dew point temperature and the outdoor temperature is smaller than a preset temperature difference and the outdoor humidity is larger than the preset humidity.
Further, the outdoor environment parameters include at least outdoor environment temperature, and the defrosting module 406 includes: the second judging submodule is used for judging whether the outdoor environment temperature is smaller than a preset temperature or not; a fourth determining unit configured to determine that the defrosting mode is a forced defrosting mode if yes; under the forced defrosting mode, the outdoor units defrost in turn; and a fifth determining unit for determining a defrosting mode according to whether the outdoor unit is not turned on or not.
The fifth determination unit includes: the first determining subunit is used for determining that the defrosting mode is a natural defrosting mode when an unopened outdoor unit exists, wherein the unopened outdoor unit is subjected to natural defrosting in turn in the natural defrosting mode, the compressor of the outdoor unit for executing natural defrosting is stopped, and the fan keeps running; and the second determining subunit is used for determining that the defrosting mode is a forced defrosting mode when the outdoor unit which is not started does not exist.
The specific manner in which the respective units and modules perform the operations in the apparatus of the above embodiments has been described in detail in the embodiments related to the method, and will not be described in detail here.
Example 3
Based on the air conditioning unit defrosting control device provided in the above embodiment 2, in a preferred embodiment 3 of the present invention, an air conditioning unit is further provided, which includes the air conditioning unit defrosting control device described above.
In the above embodiment, a defrosting control scheme of an air conditioning unit is provided, a defrosting mode is determined according to outdoor environment parameters and whether an idle outdoor unit exists, and the air conditioning unit is controlled to execute a natural defrosting mode or a forced defrosting mode.
Example 4
Based on the air conditioning unit defrosting control method provided in the above embodiment 1, there is also provided in a preferred embodiment 4 of the present invention a storage medium containing computer executable instructions which, when executed by a computer processor, are used to perform the air conditioning unit defrosting control method as described above.
In the above embodiment, a defrosting control scheme of an air conditioning unit is provided, a defrosting mode is determined according to outdoor environment parameters and whether an idle outdoor unit exists, and the air conditioning unit is controlled to execute a natural defrosting mode or a forced defrosting mode.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. An air conditioning unit defrosting control method is characterized in that the air conditioning unit comprises a plurality of groups of outdoor units connected in parallel, and the method comprises the following steps:
detecting whether defrosting is needed by the air conditioning unit;
detecting outdoor environment parameters and whether the outdoor unit which is not started exists or not when defrosting is needed;
determining a defrosting mode according to the outdoor environment parameters and whether the outdoor unit which is not started exists or not, and controlling the air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
2. The method of claim 1, further comprising, prior to detecting whether defrosting of the air conditioning unit is required:
determining the number of open groups of the outdoor unit;
and controlling the operation of the outdoor unit according to the number of the opening groups.
3. The method of claim 2, wherein determining the number of open groups of the outdoor unit comprises:
acquiring the operation parameters of the air conditioning unit, and determining the required group number of the outdoor unit according to the operation parameters;
detecting outdoor environment parameters, and judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters;
and determining the opening group number of the outdoor unit according to the judging result and the demand group number.
4. The method of claim 3, wherein determining the number of open groups of the outdoor unit based on the determination result and the number of demand groups comprises:
when the outdoor environment does not reach the frosting state, determining the number of the opening groups of the outdoor unit as the number of the demand groups;
when the outdoor environment reaches a frosting state, further judging whether the required group number reaches a preset maximum group number, and when the required group number reaches the preset maximum group number, determining that the opening group number of the outdoor unit is the preset maximum group number, otherwise, determining that the opening group number of the outdoor unit is the required group number.
5. The method of claim 4, wherein the preset maximum number of groups is a total number of groups of the outdoor unit minus a first preset value, the preset maximum number of groups being used to ensure that the outdoor unit is always maintained in a heating mode of operation during defrosting.
6. A method according to claim 3, wherein the outdoor environment parameters comprise at least: outdoor temperature, outdoor humidity; judging whether the outdoor environment reaches a frosting state according to the outdoor environment parameters, including:
calculating a dew point temperature according to the outdoor temperature and the outdoor humidity;
and when the difference between the dew point temperature and the outdoor temperature is smaller than a preset temperature difference and the outdoor humidity is larger than a preset humidity, determining that the outdoor environment reaches a frosting state.
7. The method of claim 1, wherein the outdoor environment parameter includes at least an outdoor environment temperature, and determining a defrosting mode according to the outdoor environment parameter and whether the outdoor unit is not turned on includes:
judging whether the outdoor environment temperature is less than a preset temperature;
if yes, determining that the defrosting mode is the forced defrosting mode; in the forced defrosting mode, the outdoor units defrost in turn;
otherwise, determining a defrosting mode according to whether the outdoor unit which is not started exists.
8. The method of claim 7, wherein determining a defrosting mode according to whether the outdoor unit is not turned on includes:
when the outdoor unit which is not started exists, determining the defrosting mode to be the natural defrosting mode, wherein the outdoor unit which is not started carries out natural defrosting in turn in the natural defrosting mode, and the compressor of the outdoor unit which carries out natural defrosting is stopped and the fan keeps running;
and when the outdoor unit which is not started does not exist, determining the defrosting mode as the forced defrosting mode.
9. An air conditioning unit defrosting control device, characterized in that the air conditioning unit comprises a plurality of groups of outdoor units connected in parallel, the device comprises:
the triggering module is used for detecting whether the air conditioning unit needs defrosting or not;
the detection module is used for detecting outdoor environment parameters and whether the outdoor unit which is not started exists or not when defrosting is needed;
the defrosting module is used for determining a defrosting mode according to the outdoor environment parameters and whether the outdoor unit which is not started exists or not, and controlling the air conditioner unit to defrost according to the defrosting mode; wherein, the defrosting mode at least comprises a natural defrosting mode and a forced defrosting mode.
10. An air conditioning unit comprising the defrosting control device of claim 9.
11. A storage medium containing computer executable instructions, which when executed by a computer processor are for performing the air conditioning unit defrosting control method of any one of claims 1 to 8.
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| CN202311521320.7A CN117588829A (en) | 2023-11-15 | 2023-11-15 | Defrosting control method and device for air conditioning unit and air conditioning unit |
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| CN202311521320.7A CN117588829A (en) | 2023-11-15 | 2023-11-15 | Defrosting control method and device for air conditioning unit and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118896426A (en) * | 2024-09-29 | 2024-11-05 | 珠海格力电器股份有限公司 | System control method, device, air source heat pump system, storage medium and electronic equipment based on air volume attenuation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118896426A (en) * | 2024-09-29 | 2024-11-05 | 珠海格力电器股份有限公司 | System control method, device, air source heat pump system, storage medium and electronic equipment based on air volume attenuation |
| CN118896426B (en) * | 2024-09-29 | 2025-01-28 | 珠海格力电器股份有限公司 | System control method, device, air source heat pump system, storage medium and electronic equipment based on air volume attenuation |
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