CN109469963B - Defrosting control method and unit - Google Patents
Defrosting control method and unit Download PDFInfo
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- CN109469963B CN109469963B CN201811136118.1A CN201811136118A CN109469963B CN 109469963 B CN109469963 B CN 109469963B CN 201811136118 A CN201811136118 A CN 201811136118A CN 109469963 B CN109469963 B CN 109469963B
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- heat exchanger
- outdoor heat
- pipe temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
-
- 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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- 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 a unit, wherein the defrosting control method is used for determining whether an outdoor heat exchanger frosts or not according to the pipe temperature difference of the outdoor heat exchanger of the unit; if not, determining not to enter a defrosting mode; if yes, whether the defrosting mode is entered or not is determined according to the current working parameters. Therefore, a series of problems that the unit enters a defrosting mode when the outdoor heat exchanger is frostless, energy waste is caused, heating efficiency is reduced, and user experience is influenced can be avoided. The unit is prevented from doing useless work, and the energy-saving and environment-friendly effects are achieved. And the heating efficiency is improved, so that the unit can run more reasonably, and the comfort level of a user is improved.
Description
Technical Field
The invention relates to the field of units, in particular to a defrosting control method and a unit.
Background
Currently, whether the multi-split air conditioner enters the defrosting mode is generally judged based on the outdoor environment temperature, the outdoor heat exchanger pipeline temperature and the time when the multi-split air conditioner is in the heating mode. When the multi-split air conditioner is in a heating mode in winter, the outdoor heat exchanger can also frequently enter a defrosting mode when no frost exists. For example: when the outdoor ambient temperature is low, but the humidity is low, or the load of the indoor unit is suddenly increased, the temperature of the pipe line of the outdoor heat exchanger is lowered in a short time, and if the time for which the unit is operated in the heating mode also satisfies the condition for determining whether to enter the defrosting mode, the unit enters the defrosting mode. In fact, the outdoor heat exchanger is in a frostless state at the moment.
Aiming at the problems of lower comfort and environmental pollution caused by the fact that the unit enters a defrosting mode when the outdoor heat exchanger is in a frostless state in the related art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a defrosting control method and a unit, which can solve the problems of low comfort and environmental pollution caused by the fact that the unit enters a defrosting mode when an outdoor heat exchanger is in a frostless state in the related art.
In a first aspect, an embodiment of the present invention provides a defrosting control method, where the method includes:
determining whether the outdoor heat exchanger frosts or not according to the pipe temperature difference of the unit outdoor heat exchanger;
if not, determining not to enter a defrosting mode;
if yes, whether the defrosting mode is entered or not is determined according to the current working parameters.
Further, determining whether the outdoor heat exchanger is frosted according to the pipe temperature difference of the unit outdoor heat exchanger comprises:
calculating the average value of the pipe temperature difference within a first preset time after the unit is started to operate, and taking the average value as a reference value; the pipe temperature difference is the difference value of pipe temperature values of any two branch pipelines of the outdoor heat exchanger;
then, detecting the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length;
if yes, determining that the outdoor heat exchanger is frosted; and if not, determining that the outdoor heat exchanger is not frosted.
Further, determining whether to enter a defrosting mode according to the current working parameters comprises:
acquiring current working parameters;
judging whether the current working parameters meet the preset conditions for the unit to enter a defrosting mode;
if yes, controlling the unit to enter a defrosting mode; and if not, controlling the unit to maintain the heating mode.
Further, the operating parameters include: the minimum pipe temperature value of the outdoor heat exchanger, the time length of the unit maintaining the heating mode,
judging whether the current working parameters meet the preset conditions for the unit to enter the defrosting mode or not comprises the following steps:
if the minimum pipe temperature value is smaller than a maximum pipe temperature threshold value and the time length is larger than a first preset time length, determining that the current working parameters meet the preset condition that the unit enters a defrosting mode; and the maximum pipe temperature threshold value and the outdoor environment temperature value have a corresponding relation.
In a second aspect, an embodiment of the present invention provides an assembly configured to execute the method in the first aspect, where the assembly includes: a main controller, an outdoor heat exchanger and a temperature sensor,
the temperature sensor is positioned on a branch pipeline of the outdoor heat exchanger and used for detecting the temperature of the branch pipeline;
the main controller is connected with the temperature sensors and is used for acquiring the temperatures of the branch pipelines and determining whether the outdoor heat exchanger frosts or not according to the pipe temperature difference of any two branch pipelines; if not, determining that the unit does not enter a defrosting mode; and if so, determining whether the unit enters a defrosting mode or not according to the current working parameters.
Further, the main controller is further configured to calculate an average value of the pipe temperature difference within a first preset time period after the unit is started up and operated, and use the average value as a reference value; the pipe temperature difference is the difference value of pipe temperature values of any two branch pipelines of the outdoor heat exchanger; then, determining the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length; if yes, determining that the outdoor heat exchanger is frosted; and if not, determining that the outdoor heat exchanger is not frosted.
Further, the unit is an air conditioner.
Further, the air conditioner is a multi-split air conditioner.
By applying the technical scheme of the invention, whether the outdoor heat exchanger frosts or not is determined according to the pipe temperature difference of the outdoor heat exchanger of the unit; if not, determining not to enter a defrosting mode; if yes, whether the defrosting mode is entered or not is determined according to the current working parameters. Therefore, the unit can be prevented from entering a defrosting mode in a frostless state, so that the unit is prevented from doing useless work, and the energy-saving and environment-friendly effects are achieved. And the influence on the use experience of a user due to frequent entering of the defrosting mode can be avoided, the unit can run more reasonably, the heating efficiency of the unit is improved, and the comfort level of the user is improved.
Drawings
FIG. 1 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 4 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 5 is a block diagram of an assembly according to an embodiment of the present invention;
fig. 6 is a block diagram of an assembly according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments, it being understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
In order to solve the problems of lower comfort and environmental pollution caused by the fact that the unit enters a defrosting mode when the outdoor heat exchanger is in a frostless state in the related art. As shown in fig. 1, an embodiment of the present invention provides a defrosting control method, including:
s101, determining whether the outdoor heat exchanger frosts according to the pipe temperature difference of the outdoor heat exchanger of the unit; if not, executing step S102; if yes, executing step S103;
step S102, determining not to enter a defrosting mode;
and step S103, determining whether to enter a defrosting mode according to the current working parameters.
Therefore, the unit can be prevented from entering a defrosting mode in a frostless state, so that the unit is prevented from doing useless work, and the energy-saving and environment-friendly effects are achieved. And the influence on the use experience of a user due to frequent entering of the defrosting mode can be avoided, the unit can run more reasonably, the heating efficiency of the unit is improved, and the comfort level of the user is improved.
In one possible implementation manner, as shown in fig. 2, the step S101 of determining whether the outdoor heat exchanger is frosted according to the pipe temperature difference of the unit outdoor heat exchanger includes:
step S201, calculating an average value of pipe temperature difference within a first preset time after the unit is started to operate, and taking the average value as a reference value;
the pipe temperature difference is the difference value of pipe temperature values of any two branch pipelines of the outdoor heat exchanger;
step S202, detecting the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length; if yes, go to step S203; if not, executing step S204;
step S203, determining that the outdoor heat exchanger is frosted;
and step S204, determining that the outdoor heat exchanger is not frosted.
Wherein, when the unit is started and stably operates, the average value of the pipe temperature difference in the first preset time length can be determined. The branch pipelines of the two outdoor heat exchangers can be selected at will and used as sample pipelines to determine the average value of the temperature difference of the pipelines. It can be understood that a specific number of time points can be selected within the first preset time period and recorded as N, and then the average value can be determined by taking the sum of the tube temperature difference values of the N time points as a divisor. The average value may be obtained from the calculus, but the invention is not limited thereto.
It should be noted that, if the pipelines of the outdoor heat exchanger are not frosted, the difference between the pipe temperature difference and the reference value is smaller than the preset difference, and after frosting, the frosting degree between the pipelines is different, which may result in a large difference in the temperature of the pipelines, at this time, the difference between the pipe temperature difference and the reference value is greater than or equal to the preset difference and lasts for the second preset time, so that frosting of the outdoor heat exchanger may be more accurately determined. The first preset time and the second preset time can be set according to the unit performance and the location of the air conditioner.
In one possible implementation manner, as shown in fig. 3, the step S103 of determining whether to enter the defrosting mode according to the current operating parameters includes:
s301, acquiring current working parameters;
step S302, judging whether the current working parameters meet the preset conditions for the unit to enter a defrosting mode; if yes, executing step S303; if not, executing step S304;
step S303, controlling the unit to enter a defrosting mode;
and step S304, controlling the unit to maintain the heating mode.
In one possible implementation, the operating parameters include: the minimum pipe temperature value of the outdoor heat exchanger and the duration of the unit maintaining the heating mode, and whether the current working parameters meet the preset conditions for the unit to enter the defrosting mode or not is judged to comprise the following steps: if the minimum pipe temperature value is smaller than the maximum pipe temperature threshold value and the duration is longer than a first preset duration, determining that the current working parameters meet preset conditions for the unit to enter a defrosting mode; the maximum pipe temperature threshold value and the outdoor environment temperature value have a corresponding relation.
When the unit is in the heating mode for a long time, the frosting state of the outdoor heat exchanger can occur. It is to be noted that a precondition of the method shown in fig. 3 is that frosting of the outdoor heat exchanger has been determined. And further judging whether the current working parameters meet the preset condition that the unit enters a defrosting mode, and controlling the unit to enter the defrosting mode when the current working parameters meet the preset condition so as to melt the frost covered on the heat exchanger of the outdoor unit. Therefore, the heating efficiency can be further improved, energy waste is avoided, and the comfort level of a user is improved.
Fig. 4 illustrates a defrosting control method according to an embodiment of the present invention, and as shown in fig. 4, the method includes:
step S401, starting up the unit;
s402, enabling the unit to enter a heating mode;
s403, detecting the outdoor environment temperature t and the outdoor heat exchanger tube temperatures t1 and t 2;
the outdoor environment temperature t can be detected through an outdoor environment temperature sensor or a temperature sensing bulb, t3 can be determined according to t, and t3 is a maximum pipe temperature threshold value; t1 is the temperature of the upper pipe, t2 is the temperature of the lower pipe;
s404, recording the average temperature difference X of the upper pipeline and the lower pipeline of the heat exchanger within M minutes before;
wherein, for convenient calculation, the average temperature difference can be converted into absolute value.
Step S405, recording the temperature difference Y of the upper pipeline and the lower pipeline in real time after M minutes;
step S406, if the continuous A minutes is judged to be X-Y | ≧ Δ T?, executing step S407, and if not, returning to execute step S405;
wherein, for the convenience of calculation, the difference value can be converted into an absolute value.
Step S407, judging Min (t1, t2) < t3, if yes, executing step S408 if continuous heating time > B minutes?, and otherwise executing step S409;
b is the duration of the unit maintaining the heating mode, Min (t1, t2) represents the minimum pipe temperature value, and t3 is the maximum pipe temperature threshold;
step S408; entering a defrosting mode to operate;
step S409, entering a heating mode to operate; and during the heating mode operation, the step S407 may be executed in real time.
Therefore, the unit can be prevented from entering a defrosting mode in a frostless state, so that the unit is prevented from doing useless work, and the energy-saving and environment-friendly effects are achieved. And the influence on the use experience of a user due to frequent entering of the defrosting mode can be avoided, the unit can run more reasonably, the heating efficiency of the unit is improved, and the comfort level of the user is improved.
Fig. 5 shows an assembly for performing the method shown in the above embodiments, the assembly comprising: a main controller 1, an outdoor heat exchanger 2 and a temperature sensor 3,
the temperature sensor 3 is positioned on the branch pipeline of the outdoor heat exchanger 2 and used for detecting the temperature of the branch pipeline;
the main controller 1 is connected with the temperature sensor 3 and used for acquiring the temperature of the branch pipelines and determining whether the outdoor heat exchanger 2 frosts or not according to the pipe temperature difference of any two branch pipelines; if not, determining that the unit does not enter a defrosting mode; and if so, determining whether the unit enters a defrosting mode or not according to the current working parameters.
Wherein, the temperature sensor is at least two.
In a possible implementation manner, the main controller 1 is further configured to calculate an average value of the pipe temperature difference within a first preset time period after the unit is started up and operated, and use the average value as a reference value; the pipe temperature difference is the difference value of the pipe temperature values of any two branch pipelines of the outdoor heat exchanger 2; then, determining the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length; if yes, determining that the outdoor heat exchanger 2 is frosted; if not, the outdoor heat exchanger 2 is determined not to be frosted.
In one possible implementation, the unit is an air conditioner.
In one possible implementation, the air conditioner is a multi-split air conditioner.
In one possible implementation, as shown in fig. 6, when the unit is in the heating mode, the refrigerant flows through: the air conditioner comprises a compressor, an oil equalizer, a four-way valve, an air pipe, an indoor unit, a liquid pipe, an outdoor heat exchanger, a four-way valve, a steam separator and a return air compressor. The compressor, the oil equalizer, the four-way valve, the air pipe, the indoor unit, the outdoor heat exchanger, the four-way valve and the steam distributor are sequentially connected. And the outdoor heat exchanger shown in fig. 5 is provided with two temperature sensors respectively located on any two branch pipelines of the outdoor heat exchanger.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a mobile terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments illustrated in the drawings, the present invention is not limited to the embodiments, which are illustrative rather than restrictive, and it will be apparent to those skilled in the art that many more modifications and variations can be made without departing from the spirit of the invention and the scope of the appended claims.
Claims (9)
1. A defrosting control method characterized in that the method comprises:
determining whether the outdoor heat exchanger frosts or not according to the pipe temperature difference of the unit outdoor heat exchanger;
if not, determining not to enter a defrosting mode;
if yes, determining whether to enter a defrosting mode according to the current working parameters;
determining whether the outdoor heat exchanger is frosted according to the pipe temperature difference of the unit outdoor heat exchanger comprises the following steps:
calculating the average value of the pipe temperature difference within a first preset time after the unit is started to operate, and taking the average value as a reference value; the pipe temperature difference is the difference value of pipe temperature values of any two branch pipelines of the outdoor heat exchanger;
then, detecting the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length;
if yes, determining that the outdoor heat exchanger is frosted; and if not, determining that the outdoor heat exchanger is not frosted.
2. The method of claim 1, wherein determining whether to enter a defrost mode based on current operating parameters comprises:
acquiring current working parameters;
judging whether the current working parameters meet the preset conditions for the unit to enter a defrosting mode;
if yes, controlling the unit to enter a defrosting mode; and if not, controlling the unit to maintain the heating mode.
3. The method of claim 2, wherein the operating parameters comprise: the minimum pipe temperature value of the outdoor heat exchanger, the time length of the unit maintaining the heating mode,
judging whether the current working parameters meet the preset conditions for the unit to enter the defrosting mode comprises the following steps:
if the minimum pipe temperature value is smaller than a maximum pipe temperature threshold value and the time length is larger than a first preset time length, determining that the current working parameters meet the preset condition that the unit enters a defrosting mode; and the maximum pipe temperature threshold value and the outdoor environment temperature value have a corresponding relation.
4. An assembly for performing the method of any one of claims 1 to 3, the assembly comprising: a main controller, an outdoor heat exchanger and a temperature sensor,
the temperature sensor is positioned on a branch pipeline of the outdoor heat exchanger and used for detecting the temperature of the branch pipeline;
the main controller is connected with the temperature sensors and is used for acquiring the temperatures of the branch pipelines and determining whether the outdoor heat exchanger frosts or not according to the pipe temperature difference of any two branch pipelines; if not, determining that the unit does not enter a defrosting mode; and if so, determining whether the unit enters a defrosting mode or not according to the current working parameters.
5. The assembly according to claim 4,
the main controller is further used for calculating an average value of pipe temperature difference within a first preset time after the unit is started to operate, and taking the average value as a reference value; the pipe temperature difference is the difference value of pipe temperature values of any two branch pipelines of the outdoor heat exchanger; then, determining the pipe temperature difference in real time, and judging whether the difference value between the pipe temperature difference and the reference value is greater than or equal to a preset difference value and lasts for a second preset time length; if yes, determining that the outdoor heat exchanger is frosted; and if not, determining that the outdoor heat exchanger is not frosted.
6. Assembly according to claim 4 or 5,
the unit is an air conditioner.
7. The assembly according to claim 6,
the air conditioner is a multi-split air conditioner.
8. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the defrost control method of any one of claims 1-3 when executing the program.
9. A storage medium containing computer-executable instructions for performing the defrost control method of any one of claims 1-3 when executed by a computer processor.
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| CN201811136118.1A CN109469963B (en) | 2018-09-28 | 2018-09-28 | Defrosting control method and unit |
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| CN201811136118.1A CN109469963B (en) | 2018-09-28 | 2018-09-28 | Defrosting control method and unit |
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| CN109469963B true CN109469963B (en) | 2019-12-20 |
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| CN201440005U (en) * | 2009-08-04 | 2010-04-21 | 艾欧史密斯(中国)热水器有限公司 | Antifreezing solar water heater |
| JP6254473B2 (en) * | 2014-03-27 | 2017-12-27 | 大阪瓦斯株式会社 | Condensation detector |
| JP6201872B2 (en) * | 2014-04-16 | 2017-09-27 | 三菱電機株式会社 | Air conditioner |
| US10168067B2 (en) * | 2015-09-22 | 2019-01-01 | Lennox Industries Inc. | Detecting and handling a blocked condition in the coil |
| CN107202399B (en) * | 2017-05-17 | 2020-08-04 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
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