CN114216213A - Defrosting control method of air conditioner and air conditioner - Google Patents
Defrosting control method of air conditioner and air conditioner Download PDFInfo
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- CN114216213A CN114216213A CN202111509872.7A CN202111509872A CN114216213A CN 114216213 A CN114216213 A CN 114216213A CN 202111509872 A CN202111509872 A CN 202111509872A CN 114216213 A CN114216213 A CN 114216213A
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- defrosting
- air conditioner
- water vapor
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of defrosting, and particularly relates to a defrosting control method of an air conditioner and the air conditioner, wherein the control method comprises the following steps: and in the heating operation of the air conditioner, whether the defrosting starting condition is achieved is determined according to the average increase rate of the water vapor partial pressure difference of the outdoor heat exchanger. According to the invention, the temperature of the outer pipe of the air conditioner is not taken as a judgment condition, but directly according to the frosting principle, when the outdoor unit is frosted, the temperature of the outer pipe is reduced, so that the partial pressure difference of the water vapor is rapidly increased, therefore, the defrosting time can be determined according to the average increase rate of the partial pressure difference of the water vapor, the defrosting is started when the most suitable defrosting time is reached, and the use experience of a user is improved.
Description
Technical Field
The invention belongs to the technical field of defrosting, and particularly relates to a defrosting control method of an air conditioner and the air conditioner.
Background
In cold winter, the outdoor may frost due to low heating temperature, and in the current control, the judgment condition of a fixed heating time and the outer tube temperature is generally used to judge whether defrosting should be performed. The judgment condition is not intelligent enough, the judgment is carried out by means of artificial partition judgment, the frosting principle is not attached, and if the defrosting time is earlier, the defrosting is frequently carried out within a period of time when the user uses the defrosting, so that the user experience is influenced; if the defrosting time is later, the indoor heating capacity is poorer and poorer, the defrosting time is longer, and the user experience is also influenced.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a defrosting control method of an air conditioner and the air conditioner.
A first object of the present invention is to provide a defrosting control method of an air conditioner, including:
and in the heating operation of the air conditioner, whether the defrosting starting condition is achieved is determined according to the average increase rate of the water vapor partial pressure difference of the outdoor heat exchanger.
Further optionally, the determining whether the condition for starting defrosting is reached according to the average increase rate of the water vapor partial pressure difference of the outdoor heat exchanger comprises
Calculating the real-time partial pressure difference delta P of the water vapor of the outdoor heat exchanger;
every t0Mean value E of the partial pressure difference Δ P of the water vapor over the time calculation period tn；
Calculating the current mean value EnAnd the previous mean value En-1A difference Δ E ═ En-En-1；
And determining whether a condition for starting defrosting is reached according to the difference value delta E.
Further optionally, said determining whether a condition for initiating defrosting is reached based on said difference Δ E comprises
Comparing the difference Delta E with a set difference Delta ESetting upThe size of (d);
when Δ E ≧ Δ E is satisfiedSetting upAnd judging that the defrosting starting condition is reached.
Further optionally, the calculating the real-time partial pressure difference Δ P of water vapor of the outdoor heat exchanger comprises
Acquiring real-time temperature value and humidity value of outdoor environment, and calculating real-time outdoor environment water vapor partial pressure value P1；
Acquiring real-time temperature value and humidity value of air near the outer pipe of the air conditioner, and calculating water vapor partial pressure value P of air near the real-time outer pipe temperature2；
Calculating the partial pressure difference of water vapor Delta P, wherein the Delta P is P1-P2。
Further optionally, the compressor starts t1After time, every t0Mean value E of partial pressure difference of water vapor in set time length t of time calculationnWherein t1 is more than or equal to t and more than or equal to t0。
Further optionally, the obtaining of the real-time temperature value of the air near the outer tube of the air conditioner is obtaining of a real-time temperature value of the outer tube of the air conditioner.
Further optionally, after a defrosting starting condition is reached, the air conditioner is controlled to enter defrosting, defrosting is finished after a defrosting finishing condition is reached, and the defrosting starting condition is judged again.
A second object of the present invention is to provide a control apparatus of an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, when the one or more processors execute the program instructions, the one or more processors are configured to implement the method of any one of the above.
A third object of the invention proposes a non-transitory computer-readable storage medium having stored thereon program instructions for implementing the method according to any one of the above when the program instructions are executed by one or more processors.
A fourth object of the present invention is to provide an air conditioner, which employs any one of the above methods, or includes the above control device, or has a non-transitory computer readable storage medium as described above.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the invention, the temperature of the outer pipe of the air conditioner is not taken as a judgment condition, but directly according to the frosting principle, when the outdoor unit is frosted, the temperature of the outer pipe is reduced, so that the partial pressure difference delta P of the water vapor is rapidly increased, and the defrosting time can be determined according to the average increase rate of the partial pressure difference of the water vapor under different working conditions, so that the air conditioner can start defrosting at the most appropriate time, and the user experience is provided.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1: is a control flow diagram of an embodiment of the invention;
FIG. 2: is a control flow diagram of a specific implementation of an embodiment of the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a defrosting control method of an air conditioner, which is a control flow chart shown in fig. 1 and comprises steps S1-S2, wherein the control flow chart comprises the following steps:
s1, heating operation of the air conditioner;
and S2, determining whether the defrosting starting condition is reached according to the average increase rate of the water vapor partial pressure difference of the outdoor heat exchanger.
In this embodiment, since the frosting process is caused by the desublimation of the water vapor in the outdoor environment near the outer tube, the magnitude of the partial pressure difference of the water vapor in the outer tube of the outdoor heat exchanger represents the magnitude of the frosting phase change driving force. When the outer pipe of the outdoor heat exchanger frosts, the temperature of the outer pipe is reduced, so that the partial pressure difference delta P of the steam is rapidly increased, and the judgment is more accurate by taking the increase rate of the partial pressure difference delta P of the steam as a judgment standard for starting defrosting.
Further optionally, the step S2 includes S21 to S24, wherein:
s21, calculating the real-time partial pressure difference delta P of the water vapor of the outdoor heat exchanger;
s22 every t0Mean value E of the partial pressure difference Δ P of the water vapor over the time calculation period tn；
S23 calculating the current mean value EnAnd the previous mean value En-1A difference Δ E ═ En-En-1；
S24 determines whether the condition for starting defrosting is reached according to the difference value delta E.
In this embodiment, when the air condensing units frosted more thickly, the off-premises station heat transfer condition worsened, and outer tube temperature can descend, and outer tube temperature's decline can make water vapor partial pressure difference Δ P rise rapidly, and this embodiment utilizes water vapor partial pressure difference Δ P to judge at the average growth rate of a period of time whether get into immediately and change the frost, and difference Δ E can reflect the average growth rate of water vapor partial pressure difference. Since it takes a while for the air conditioner to operate from the start-up to the time when a system parameter is relatively stable, and then the partial pressure difference Δ P of the water vapor will be stable for a while, it is preferable that the compressor is started up at t1After a time, at which point the system reaches steady state, then every t0Mean value E of partial pressure difference of water vapor in set time length t of time calculationnWherein t1 is more than or equal to t and more than or equal to t0When the temperature of the air conditioner outer pipe begins to fall, the partial pressure difference delta P of the water vapor begins to rise rapidly, and whether defrosting is started immediately is judged according to the average increase rate of the partial pressure difference delta P of the water vapor in a period of time.
Further optionally, step S24 includes S241 to S242, wherein
S241, comparing the difference value delta E with a set difference value delta ESetting upThe size of (d);
s242, when the condition that delta E is more than or equal to delta E is metSetting upAnd judging that the defrosting starting condition is reached.
In this embodiment, a determination condition is formed by the average increase rate of the partial pressure difference of water vapor reaching a certain value (for example, 0.05pa/s) over a period of time, and it is determined whether defrosting is immediately performed, and the difference Δ E can reflect the average increase rate of the partial pressure difference of water vapor, when Δ E is greater than or equal to Δ ESetting upWhen the condition for starting defrosting is reached, judging that the defrosting condition is reached, and when delta E is less than delta ESetting upAnd when the air conditioner is in operation, the heating operation of the air conditioner is maintained.
In one embodiment, as shown in the flowchart of fig. 2, after the compressor is operated for t1 (for example, 15min), the average value of the partial pressure difference Δ Ρ of the past 5min is recorded as E0, the average value of the partial pressure difference Δ Ρ of the past 5min is calculated as E1 after 1min, and Δ Ε is calculated as the difference between E1 and E0. Determining the value of Δ E and the set mean value Δ ESetting upWhen Δ E is larger than Δ ESetting upDefrosting is carried out, otherwise, heating operation is continued; then let E0＝E1And record the next E1A value of (D), calculating E1-E0Then continue to judge Δ E and the set mean value Δ ESetting upAnd (c) so on. And when the condition of starting defrosting is met, controlling the air conditioner to enter defrosting, finishing defrosting when the condition of finishing defrosting is met, and judging the condition of starting defrosting again, namely determining whether the condition of starting defrosting is met again according to the average increase rate of the partial pressure difference of the water vapor of the outdoor heat exchanger. As shown in the flowchart of fig. 2, when the air conditioner reaches the condition of finishing defrosting, the air conditioner performs heating operation again and returns to perform the first step.
Further optionally, step S21 includes S211-S213, wherein
S211, acquiring real-time temperature value and humidity value of outdoor environment, and calculating real-time outdoor environment water vapor partial pressure value P1；
S212, acquiring real-time temperature value and humidity value of air near the outer pipe of the air conditioner, and calculating water vapor partial pressure value P of air near the real-time outer pipe temperature2；
S213, calculating the partial pressure difference delta P of the water vapor, wherein the delta P is P1-P2。
In this embodiment, the real-time temperature value and the real-time humidity value of the outdoor environment can be detected by the temperature sensor and the humidity sensor which are arranged on the outdoor unit shell. And a stable rear sensor and a humidity sensor are arranged on the outer pipe of the outdoor heat exchanger to detect the temperature and the humidity of the air near the outdoor heat exchanger, and the temperature of the air near the outer pipe is approximately equal to the temperature of the outer pipe, so that the temperature of the air near the outer pipe can be directly determined by detecting the real-time temperature of the outer pipe.
In this embodiment, there are various ways to calculate the partial pressure value of the water vapor, and one implementable way is as follows:
partial pressure of water vapor
Wherein Ps is the saturated pressure of water vapor,
relative humidity of air (detectable by a humidity sensor);
the water vapor saturation pressure Ps can be calculated in various ways, for example, according to the Goff equation, and will not be described in detail herein.
Ps＝ef(T)；
f(T)＝a/T+b+c·T+d·T2+e·T3+f·T4+g·lnT；
T＝273.15+t；
Wherein t is the temperature of the air dry bulb, and a, b, c, d, e, f and g are formula coefficients;
the present embodiment also proposes a control device of an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, when the one or more processors execute the program instructions, the one or more processors are configured to implement the method of any one of the above.
The present embodiments also propose a non-transitory computer-readable storage medium having stored thereon program instructions for implementing the method according to any one of the above when the program instructions are executed by one or more processors.
The present embodiment also proposes an air conditioner that employs the method of any one of the above, or includes the control device described above, or has a non-transitory computer-readable storage medium described above.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A defrosting control method of an air conditioner is characterized by comprising the following steps:
and during heating operation of the air conditioner, determining whether a condition for starting defrosting is achieved according to the average increase rate of the partial pressure difference of the water vapor of the outdoor heat exchanger.
2. The defrosting control method of an air conditioner according to claim 1, wherein the determining whether the defrosting start condition is reached according to the average increase rate of the partial pressure difference of water vapor of the outdoor heat exchanger comprises
Calculating the real-time partial pressure difference delta P of the water vapor of the outdoor heat exchanger;
every t0Mean value E of the partial pressure difference Δ P of the water vapor over the time calculation period tn；
Calculating the current mean value EnAnd the previous mean value En-1A difference Δ E ═ En-En-1；
And determining whether a condition for starting defrosting is reached or not according to the difference value delta E.
3. The defrosting control method of an air conditioner according to claim 2, wherein the determining whether the condition for starting defrosting is reached according to the difference Δ E comprises
Comparing the difference Delta E with a set difference Delta ESetting upThe size of (d);
when Δ E ≧ Δ E is satisfiedSetting upAnd judging that the defrosting starting condition is reached.
4. The defrosting control method of an air conditioner according to claim 2, wherein the calculating the real-time partial pressure difference Δ P of water vapor of the outdoor heat exchanger includes
Acquiring real-time temperature value and humidity value of outdoor environment, and calculating real-time outdoor environment water vapor partial pressure value P1；
Acquiring real-time temperature value and humidity value of air near the outer pipe of the air conditioner, and calculating water vapor partial pressure value P of air near the real-time outer pipe temperature2；
Calculating the partial pressure difference of water vapor Delta P, wherein the Delta P is P1-P2。
5. The defrosting control method of an air conditioner according to claim 4,
compressor start-up t1After time, every t0Mean value E of partial pressure difference of water vapor in set time length t of time calculationnWherein t1 is more than or equal to t and more than or equal to t0。
6. The defrosting control method of an air conditioner according to claim 1, wherein the obtaining of the real-time temperature value of the air near the outer pipe of the air conditioner is obtaining of a real-time temperature value of the outer pipe of the air conditioner.
7. The defrosting control method of an air conditioner according to claim 1, wherein the air conditioner is controlled to enter defrosting when a defrosting start condition is reached, defrosting is finished when a defrosting finish condition is reached, and the defrosting start condition is determined again.
8. A control apparatus of an air conditioner, comprising one or more processors and a non-transitory computer readable storage medium storing program instructions, the one or more processors being configured to implement the method according to any one of claims 1 to 7 when the program instructions are executed by the one or more processors.
9. A non-transitory computer-readable storage medium having stored thereon program instructions which, when executed by one or more processors, are to implement the method of any one of claims 1-7.
10. An air conditioner, characterized in that it employs the method of any one of claims 1-7, or comprises the control device of claim 8, or has a non-transitory computer-readable storage medium according to claim 9.
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