CN110567116A - Defrosting control method and system for air treatment unit, storage medium and processor - Google Patents
Defrosting control method and system for air treatment unit, storage medium and processor Download PDFInfo
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- CN110567116A CN110567116A CN201910769959.4A CN201910769959A CN110567116A CN 110567116 A CN110567116 A CN 110567116A CN 201910769959 A CN201910769959 A CN 201910769959A CN 110567116 A CN110567116 A CN 110567116A
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- 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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
the invention belongs to the field of air conditioners and discloses a defrosting control method, a defrosting control system, a storage medium and a processor of an air treatment unit, wherein the method comprises the steps of obtaining the temperature of an outdoor coil pipe and the pressure value of the outdoor coil pipe after the unit operates; when the temperature of the outdoor coil pipe is lower than a first preset temperature and the accumulated time exceeds a first preset time length, acquiring the outdoor environment temperature; judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not; if so, correcting the outdoor environment temperature by adopting a first preset coefficient; if not, correcting the outdoor environment temperature by adopting a second preset coefficient; calculating the temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature; and entering a defrosting process when the temperature difference value is greater than the pressure value. The invention can make the set judgment condition of entering the defrosting process more accord with the actual operation condition of the unit, avoid entering the defrosting too early or too late, and further improve the heating efficiency of the unit.
Description
Technical Field
the invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method and system for an air handling unit, a storage medium and a processor.
Background
with the continuous improvement of living standard, more and more household appliances enter the lives of people. Various problems can be encountered in the use process of household appliances, for example, when the air conditioner is in heating operation in winter, after the temperature of the outdoor heat exchanger reaches below zero, frost may be formed, and the air flowing is blocked due to a thick frost layer, which affects the heating capability of the air conditioner. In order to ensure that the air conditioning system can continuously heat, the air conditioner needs to be subjected to defrosting treatment.
The existing air conditioner is provided with a defrosting function, but the starting condition of the defrosting process is not accurately judged, so that the air conditioner can enter defrosting too early or too late. The premature defrosting of the air conditioner can cause high pressure and frequent defrosting of the system, thereby causing waste of heat; the problem that the air conditioner enters the defrosting too late, the system is low in pressure, the heating efficiency is low and the like is caused.
disclosure of Invention
the invention aims to provide a defrosting control method, a defrosting control system, a storage medium and a processor of an air handling unit, so that the set judgment condition for entering a defrosting process is more consistent with the actual operation condition of the unit, the unit is prevented from entering defrosting too early or too late, and the heating efficiency of the unit is improved.
the technical scheme provided by the invention is as follows:
In one aspect, a defrosting control method for an air handling unit is provided, which includes:
after the unit is electrified and operated in a heating mode, acquiring the temperature of the outdoor coil and the pressure value of the outdoor coil in real time;
When the temperature of the outdoor coil pipe is lower than a first preset temperature and the accumulated time exceeds a first preset time length, acquiring the outdoor environment temperature;
judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not;
if so, correcting the outdoor environment temperature by adopting a first preset coefficient to obtain the corrected outdoor environment temperature;
if not, correcting the outdoor environment temperature by adopting a second preset coefficient to obtain the corrected outdoor environment temperature, wherein the second preset coefficient is larger than the first preset coefficient;
Calculating the temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature;
And entering a defrosting process when the temperature difference value is greater than the pressure value.
further, after determining whether the outdoor environment temperature is greater than or equal to a second preset temperature, the method further includes:
when the outdoor environment temperature is greater than or equal to the second preset temperature, correcting the pressure value by adopting a third preset coefficient to obtain a corrected pressure value;
when the outdoor environment temperature is lower than the second preset temperature, correcting the pressure value by adopting a fourth preset coefficient to obtain a corrected pressure value, wherein the fourth preset coefficient is larger than the third preset coefficient;
when the temperature difference value is greater than the pressure value, entering a defrosting process specifically comprises the following steps:
And entering a defrosting process when the temperature difference value is larger than the corrected pressure value.
Further, still include:
and when the temperature of the outdoor coil pipe is higher than the first preset temperature and the accumulated timing exceeds a second preset duration, restarting timing.
further, when the temperature difference is greater than the pressure value, the defrosting process is further followed by:
when the temperature of the outdoor coil pipe is higher than a third preset temperature and the defrosting time exceeds a third preset time length, finishing defrosting; or;
And when the defrosting time exceeds a fourth preset time length, finishing defrosting, wherein the fourth preset time length is longer than the third preset time length.
in another aspect, a defrosting control system for an air handling unit is also provided, which includes:
The system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the temperature of an outdoor coil pipe and the pressure value of the outdoor coil pipe in real time after the unit is electrified and operated;
The timing module is used for starting timing when the temperature of the outdoor coil pipe is lower than a first preset temperature;
The acquisition module is further used for acquiring the outdoor environment temperature when the outdoor coil temperature is less than a first preset temperature and the accumulated time exceeds a first preset time length;
The judging module is used for judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not;
The calculation module is used for correcting the outdoor environment temperature by adopting a first preset coefficient when the outdoor environment temperature is higher than the second preset temperature to obtain the corrected outdoor environment temperature;
the calculation module is further configured to correct the outdoor environment temperature by using a second preset coefficient when the outdoor environment temperature is lower than the second preset temperature, so as to obtain a corrected outdoor environment temperature, where the second preset coefficient is greater than the first preset coefficient;
The calculation module is further used for calculating the temperature difference value between the corrected outdoor environment temperature and the outdoor coil temperature;
and the control module is used for controlling the unit to enter a defrosting process when the temperature difference value is greater than the pressure value.
Further, the calculation module is further configured to, when the outdoor environment temperature is greater than or equal to the second preset temperature, correct the pressure value by using a third preset coefficient to obtain a corrected pressure value;
The calculation module is further configured to correct the pressure value by using a fourth preset coefficient when the outdoor environment temperature is lower than the second preset temperature, so as to obtain a corrected pressure value, where the fourth preset coefficient is greater than the third preset coefficient;
and the control module is also used for controlling the unit to enter a defrosting process when the temperature difference value is greater than the corrected pressure value.
further, the timing module is further configured to restart timing when the outdoor coil temperature is greater than the first preset temperature and the accumulated timing exceeds a second preset duration.
further, the control module is further configured to control the unit to finish defrosting when the temperature of the outdoor coil is greater than a third preset temperature and the defrosting time exceeds a third preset duration;
The control module is further used for controlling the unit to finish defrosting when the defrosting time exceeds a fourth preset time length, wherein the fourth preset time length is longer than the third preset time length.
in still another aspect, a computer-readable storage medium is provided, on which a computer program is stored, the program, when executed by a processor, implementing the above-mentioned defrosting control method for an air handling unit.
In still another aspect, a processor for running a computer program is provided, and when the processor executes the program, the defrosting control method of the air treatment unit is realized.
Compared with the prior art, the defrosting control method, the defrosting control system, the storage medium and the processor of the air treatment unit have the following beneficial effects that: according to the invention, when the judgment condition of entering the defrosting process is set, the pressure value of the outdoor coil is introduced to correct the temperature of the outdoor coil, namely when the pressure value is lower, the frosting degree is serious, at the moment, the difficulty of entering the defrosting process of the unit is reduced, so that the judgment condition of entering the defrosting process is more consistent with the actual operation condition of the unit, the high pressure and frequent defrosting of the system caused by early entering the defrosting process can be prevented, and the low pressure and reduced heating efficiency and the like caused by late entering the defrosting process of the unit are prevented.
drawings
The above features, technical features, advantages and implementations of a method, a system, a storage medium and a processor for defrosting an air handling unit are further described in the following description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of one embodiment of a defrosting control method for an air handling unit of the present invention;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a defrosting control method for an air handling unit according to the present invention;
FIG. 3 is a schematic flow chart diagram illustrating a defrosting control method for an air handling unit according to another embodiment of the present invention;
FIG. 4 is a block diagram illustrating the structure of one embodiment of the defrosting control of an air handling unit of the present invention.
description of the reference numerals
100. an acquisition module; 200. a timing module; 300. a judgment module; 400. a calculation module; 500. and a control module.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
it will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
fig. 1 is a flowchart of an embodiment of a defrosting control method for an air handling unit, the defrosting control method for the air handling unit including:
S101, after the unit is electrified and operated in a heating mode, acquiring the temperature of an outdoor coil and the pressure value of the outdoor coil in real time;
S102, when the temperature of the outdoor coil pipe is lower than a first preset temperature and the accumulated time exceeds a first preset time length, acquiring the outdoor environment temperature;
s103, judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not;
If so, correcting the outdoor environment temperature by adopting a first preset coefficient to obtain the corrected outdoor environment temperature;
S105, if not, correcting the outdoor environment temperature by adopting a second preset coefficient to obtain the corrected outdoor environment temperature, wherein the second preset coefficient is larger than the first preset coefficient;
s106, calculating the temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature;
and S107, when the temperature difference value is larger than the pressure value, entering a defrosting process.
Specifically, after the compressor starts heating operation, the temperature of the outdoor coil and the pressure value of the outdoor coil are obtained, and then whether the temperature of the outdoor coil is smaller than a first preset temperature is judged, wherein the first preset temperature is a preset temperature at which the outdoor coil starts frosting.
after the compressor starts heating operation, when the outdoor coil temperature is judged to be higher than a first preset temperature (the temperature at which the outdoor coil starts to frost) according to the acquired outdoor coil temperature, timing is started, when the accumulated time exceeds a second preset time, the timer is emptied and timing is restarted, and the second preset time can be set to be 3 min. When the temperature of the outdoor coil pipe is higher than the frosting starting temperature of the outdoor coil pipe and the accumulated time length exceeds the second preset time length, the fact that the outdoor coil pipe does not start frosting is indicated, and at the moment, a subsequent judgment process is not needed.
and when the temperature of the outdoor coil pipe is less than 3 ℃, timing is started, and when the accumulated time when the temperature of the outdoor coil pipe is less than 3 ℃ exceeds a first preset time length, the outdoor environment temperature is obtained, and whether the outdoor environment temperature is greater than a second preset temperature is further judged. The first preset time is the accumulated frosting time and can be set to be 30min, when the air handling unit is in the first defrosting mode, the accumulated time when the outdoor coil temperature is less than 3 ℃ exceeds 20min, whether the outdoor environment temperature is greater than the second preset temperature or not is judged, and the second preset temperature can be set to be close to 0 ℃, such as 0 ℃, +/-0.5 ℃ and the like.
For example, when the outdoor environment temperature is lower than 0 ℃, the moisture content in the air is reduced, and the difficulty of frosting the unit external unit is increased, so that when the outdoor environment temperature is higher than 0 ℃ or lower than 0 ℃, the judgment conditions for the unit to defrost should be different, and if the judgment conditions are set to be the same, the probability of mistaken defrosting is increased.
in order to reduce the probability of false defrosting, when the outdoor environment temperature is higher than 0 ℃, a first preset coefficient is adopted to correct the outdoor environment temperature, namely the outdoor environment temperature is multiplied by the first preset coefficient to obtain the corrected outdoor environment temperature; and when the outdoor environment temperature is less than 0 ℃, correcting the outdoor environment temperature by adopting a second preset coefficient, namely multiplying the outdoor environment temperature by the second preset coefficient to obtain the corrected outdoor environment temperature, wherein the second preset coefficient is greater than the first preset coefficient. And then calculating the temperature difference value between the corrected outdoor environment temperature and the outdoor coil temperature, and entering a defrosting process when the temperature difference value is greater than the pressure value of the outdoor coil.
For example, let Te be the outdoor ambient temperature, Tc be the outdoor coil temperature, C1 be the first predetermined coefficient, C2 be the second predetermined coefficient, P be the pressure value of the outdoor coil, and C2 > C1.
when Te is more than or equal to 0 ℃, and Te multiplied by C1-Tc is more than or equal to P, entering a defrosting process;
When Te is less than 0 ℃, and Te multiplied by C2-Tc is more than or equal to P, entering a defrosting process.
setting C2 to be greater than C1, when the outdoor ambient temperature Te is less than 0 ℃, Te is negative, and Tc is also negative, Te × C2 is smaller, so that the difficulty of entering defrosting increases when the outdoor ambient temperature Te is less than 0 ℃. In actual operation, the empirical value for C1 is 0.6 and the empirical value for C2 is 0.8. The unit of the pressure value P of the outdoor coil pipe is bar, when the Te multiplied by C1-Tc is larger than or equal to P, the P is a value in bar, for example, when P is 6bar, the value of P is 6 in Te multiplied by C1-Tc is larger than or equal to P.
because the accuracy of the outdoor coil temperature measured by the NTC is not high, and the temperature measured from one point is difficult to accurately represent the overall coil temperature state, the outdoor coil temperature needs to be corrected. And the severity of frosting can be reflected to the pressure value of outdoor coil pipe, at the actual operation in-process of unit, after outdoor coil pipe frosts, can lead to the wind through outdoor coil pipe to become fewly, and wind through outdoor coil pipe diminishes the back, can make outdoor coil pipe's heat transfer effect reduce, leads to the cold volume of whole outdoor coil pipe to pile up, and the cold volume piles up the back and produces the low pressure easily in the outdoor coil pipe, and the low pressure is lower then explains that frosting degree is more serious more.
Therefore, in the scheme, when the judgment condition of entering the defrosting process is set, the temperature of the outdoor coil is not corrected by adopting a fixed value, the temperature of the outdoor coil is corrected by introducing the pressure value of the outdoor coil, namely when the pressure value is lower, the frosting degree is serious, the difficulty of entering the defrosting process by the unit is reduced, the judgment condition of entering the defrosting process is more consistent with the actual operation condition of the unit, the high pressure and frequent defrosting of the system caused by too early entering of defrosting can be prevented, and the low pressure and heating efficiency reduction and the like caused by too late entering of the unit are prevented.
fig. 2 is a flowchart illustrating another embodiment of a defrosting control method for an air handling unit according to the present invention, the defrosting control method for the air handling unit includes:
s201, after the unit is electrified and operated in a heating mode, acquiring the temperature of an outdoor coil and the pressure value of the outdoor coil in real time;
S202, when the temperature of the outdoor coil pipe is lower than a first preset temperature and the accumulated timing exceeds a first preset time length, acquiring the outdoor environment temperature;
s203, judging whether the outdoor environment temperature is greater than or equal to a second preset temperature;
s204, when the outdoor environment temperature is greater than or equal to the second preset temperature, correcting the outdoor environment temperature by adopting a first preset coefficient to obtain the corrected outdoor environment temperature;
S205, when the outdoor environment temperature is greater than or equal to the second preset temperature, correcting the pressure value by adopting a third preset coefficient to obtain a corrected pressure value;
s206, when the outdoor environment temperature is lower than the second preset temperature, correcting the outdoor environment temperature by adopting a second preset coefficient to obtain the corrected outdoor environment temperature, wherein the second preset coefficient is larger than the first preset coefficient;
S207, when the outdoor environment temperature is lower than the second preset temperature, correcting the pressure value by adopting a fourth preset coefficient to obtain a corrected pressure value, wherein the fourth preset coefficient is larger than the third preset coefficient;
S208, calculating the temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature;
S209, when the temperature difference value is larger than the corrected pressure value, entering a defrosting process.
Specifically, in this embodiment, in order to further improve the accuracy of determining the defrosting condition, not only the outdoor environment temperature is corrected by using different preset coefficients, but also the pressure value of the outdoor coil is corrected by using different preset coefficients.
When the outdoor environment temperature is higher than a second preset temperature (such as 0 ℃), correcting the pressure value of the outdoor coil by adopting a third preset coefficient, namely multiplying the pressure value by the third preset coefficient to obtain a corrected pressure value; and when the outdoor environment temperature is lower than a second preset temperature (such as 0 ℃), correcting the pressure value of the outdoor coil pipe by adopting a fourth preset coefficient, namely multiplying the pressure value by the fourth preset coefficient to obtain the corrected pressure value. The fourth predetermined coefficient is greater than the third predetermined coefficient. And then calculating the temperature difference value between the corrected outdoor environment temperature and the outdoor coil temperature, and entering a defrosting process when the temperature difference value is greater than the corrected pressure value.
For example, let Te be the outdoor ambient temperature, Tc be the outdoor coil temperature, C1 be the first predetermined coefficient, C2 be the second predetermined coefficient, C3 be the third predetermined coefficient, C4 be the fourth predetermined coefficient, P be the pressure value of the outdoor coil, and C2 > C1, C4 > C3.
When Te is more than or equal to 0 ℃, and Te multiplied by C1-Tc is more than or equal to C3 multiplied by P, entering a defrosting process;
When Te is less than 0 ℃, and Te multiplied by C2-Tc is more than or equal to C4 multiplied by P, entering a defrosting process.
Setting C4 to be greater than C3 means that when the outdoor ambient temperature is lower than 0 ℃, the pressure value of the outdoor coil is corrected through C4, so that the difficulty of entering the defrosting process is increased. The empirical value of C3 was 1.4 and that of C4 was 1.8, as measured on the unit several times.
in some embodiments of the present invention, as shown in fig. 3, after entering the defrosting process, the unit further includes:
S108, when the temperature of the outdoor coil pipe is higher than a third preset temperature and the defrosting time exceeds a third preset time length, finishing defrosting; or;
And S109, when the defrosting time exceeds a fourth preset time length, finishing defrosting, wherein the fourth preset time length is longer than the third preset time length.
specifically, the third preset temperature is the temperature of the outer disk exiting defrosting, and the temperature of the outer disk exiting defrosting is preset and defaults to 16 ℃. After the unit enters a defrosting process, defrosting can be finished when any one of the following conditions is met.
The first condition is as follows: the temperature of the outdoor coil pipe is greater than the temperature of the outer coil pipe which is out of defrosting, and the accumulated time of entering defrosting exceeds a third preset time (such as 3 min).
the second condition is as follows: the cumulative time for entering defrosting exceeds a fourth preset time (such as 6 min).
after the unit enters the defrosting process, the unit meets any one of the above conditions, and the defrosting process is considered to be finished, so that the defrosting process can be finished.
it should be understood that, in the foregoing embodiments, the sequence numbers of the steps do not mean the execution sequence, and the execution sequence of the steps should be determined by functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The present invention also provides a defrosting control system for an air handling unit, as shown in fig. 4, including:
the acquiring module 100 is used for acquiring the temperature of the outdoor coil pipe and the pressure value of the outdoor coil pipe in real time after the unit is powered on and performs heating operation;
the timing module 200 is used for starting timing when the temperature of the outdoor coil pipe is lower than a first preset temperature;
The obtaining module 100 is further configured to obtain an outdoor environment temperature when the outdoor coil temperature is less than a first preset temperature and the accumulated time exceeds a first preset time length;
The judging module 300 is configured to judge whether the outdoor environment temperature is greater than or equal to a second preset temperature;
A calculating module 400, configured to, when the outdoor environment temperature is greater than the second preset temperature, correct the outdoor environment temperature by using a first preset coefficient, so as to obtain a corrected outdoor environment temperature;
The calculation module 400 is further configured to, when the outdoor environment temperature is lower than the second preset temperature, correct the outdoor environment temperature by using a second preset coefficient to obtain a corrected outdoor environment temperature, where the second preset coefficient is greater than the first preset coefficient;
The calculating module 400 is further configured to calculate a temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature;
and the control module 500 is used for controlling the unit to enter a defrosting process when the temperature difference value is greater than the pressure value.
In some embodiments of the present invention, the calculation module 400 is further configured to, when the outdoor environment temperature is greater than or equal to the second preset temperature, correct the pressure value by using a third preset coefficient, so as to obtain a corrected pressure value;
the calculation module 400 is further configured to, when the outdoor environment temperature is lower than the second preset temperature, correct the pressure value by using a fourth preset coefficient to obtain a corrected pressure value, where the fourth preset coefficient is greater than the third preset coefficient;
The control module 500 is further configured to control the unit to enter a defrosting process when the temperature difference is greater than the corrected pressure value.
in some embodiments of the present invention, the timing module 200 is further configured to restart timing when the outdoor coil temperature is greater than the first preset temperature and the accumulated timing exceeds a second preset duration.
In some embodiments of the present invention, the control module 500 is further configured to control the unit to end defrosting when the outdoor coil temperature is greater than a third preset temperature and the defrosting time exceeds a third preset duration;
the control module 500 is further configured to control the unit to finish defrosting when the defrosting time exceeds a fourth preset time length, where the fourth preset time length is greater than the third preset time length.
the specific manner in which each module in this embodiment performs operations has been described in detail in relation to the embodiment of the method, and will not be elaborated upon here.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described defrosting control method of an air handling unit.
all or part of the flow in the control method according to the above embodiments may be implemented by instructing related hardware through a computer program, where the computer program may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
the invention also provides a processor for running the computer program, and the processor executes the program to realize the defrosting control method of the air treatment unit. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like which is the control center for the computer device and which connects the various parts of the overall computer device using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the computer device by running or executing the computer programs and/or modules stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, video data, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
it should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. a defrosting control method of an air treatment unit is characterized by comprising the following steps:
after the unit is electrified and operated in a heating mode, acquiring the temperature of the outdoor coil and the pressure value of the outdoor coil in real time;
when the temperature of the outdoor coil pipe is lower than a first preset temperature and the accumulated time exceeds a first preset time length, acquiring the outdoor environment temperature;
Judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not;
if so, correcting the outdoor environment temperature by adopting a first preset coefficient to obtain the corrected outdoor environment temperature;
If not, correcting the outdoor environment temperature by adopting a second preset coefficient to obtain the corrected outdoor environment temperature, wherein the second preset coefficient is larger than the first preset coefficient;
calculating the temperature difference between the corrected outdoor environment temperature and the outdoor coil temperature;
And entering a defrosting process when the temperature difference value is greater than the pressure value.
2. the defrosting control method of an air handling unit according to claim 1, wherein after determining whether the outdoor ambient temperature is greater than or equal to a second preset temperature, the method further comprises:
when the outdoor environment temperature is greater than or equal to the second preset temperature, correcting the pressure value by adopting a third preset coefficient to obtain a corrected pressure value;
when the outdoor environment temperature is lower than the second preset temperature, correcting the pressure value by adopting a fourth preset coefficient to obtain a corrected pressure value, wherein the fourth preset coefficient is larger than the third preset coefficient;
When the temperature difference value is greater than the pressure value, entering a defrosting process specifically comprises the following steps:
and entering a defrosting process when the temperature difference value is larger than the corrected pressure value.
3. A defrosting control method for an air handling unit according to claim 1 or 2, further comprising:
And when the temperature of the outdoor coil pipe is higher than the first preset temperature and the accumulated timing exceeds a second preset duration, restarting timing.
4. The defrosting control method of an air handling unit according to claim 1, wherein when the temperature difference is greater than the pressure value, entering a defrosting process further comprises:
when the temperature of the outdoor coil pipe is higher than a third preset temperature and the defrosting time exceeds a third preset time length, finishing defrosting; or;
And when the defrosting time exceeds a fourth preset time length, finishing defrosting, wherein the fourth preset time length is longer than the third preset time length.
5. an air handling unit defrosting control system, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the temperature of an outdoor coil pipe and the pressure value of the outdoor coil pipe in real time after the unit is electrified and operated;
the timing module is used for starting timing when the temperature of the outdoor coil pipe is lower than a first preset temperature;
the acquisition module is further used for acquiring the outdoor environment temperature when the outdoor coil temperature is less than a first preset temperature and the accumulated time exceeds a first preset time length;
the judging module is used for judging whether the outdoor environment temperature is greater than or equal to a second preset temperature or not;
The calculation module is used for correcting the outdoor environment temperature by adopting a first preset coefficient when the outdoor environment temperature is higher than the second preset temperature to obtain the corrected outdoor environment temperature;
the calculation module is further configured to correct the outdoor environment temperature by using a second preset coefficient when the outdoor environment temperature is lower than the second preset temperature, so as to obtain a corrected outdoor environment temperature, where the second preset coefficient is greater than the first preset coefficient;
the calculation module is further used for calculating the temperature difference value between the corrected outdoor environment temperature and the outdoor coil temperature;
And the control module is used for controlling the unit to enter a defrosting process when the temperature difference value is greater than the pressure value.
6. The air handling unit defrosting control system of claim 5 wherein,
the calculation module is further configured to correct the pressure value by using a third preset coefficient when the outdoor environment temperature is greater than or equal to the second preset temperature, so as to obtain a corrected pressure value;
the calculation module is further configured to correct the pressure value by using a fourth preset coefficient when the outdoor environment temperature is lower than the second preset temperature, so as to obtain a corrected pressure value, where the fourth preset coefficient is greater than the third preset coefficient;
and the control module is also used for controlling the unit to enter a defrosting process when the temperature difference value is greater than the corrected pressure value.
7. an air handling unit defrosting control system according to claim 5 or 6,
the timing module is further used for restarting timing when the outdoor coil temperature is higher than the first preset temperature and the accumulated timing exceeds a second preset duration.
8. The air handling unit defrosting control system of claim 5 wherein,
the control module is further used for controlling the unit to finish defrosting when the temperature of the outdoor coil pipe is greater than a third preset temperature and the defrosting time exceeds a third preset time length;
The control module is further used for controlling the unit to finish defrosting when the defrosting time exceeds a fourth preset time length, wherein the fourth preset time length is longer than the third preset time length.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1-4.
10. a processor for running a computer program, characterized in that the processor implements the method of any of claims 1-4 when executing the program.
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| WO2024193043A1 (en) * | 2023-03-23 | 2024-09-26 | 广东美的制冷设备有限公司 | Defrosting control method, air conditioner, and readable storage medium |
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