CN115307340A - Air source heat pump unit and defrosting control method thereof - Google Patents
Air source heat pump unit and defrosting control method thereof Download PDFInfo
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- CN115307340A CN115307340A CN202210850771.4A CN202210850771A CN115307340A CN 115307340 A CN115307340 A CN 115307340A CN 202210850771 A CN202210850771 A CN 202210850771A CN 115307340 A CN115307340 A CN 115307340A
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- 238000010257 thawing Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005070 sampling Methods 0.000 claims abstract description 100
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioner defrosting, and particularly provides an air source heat pump unit and a defrosting control method thereof. The method aims to solve the problem that the existing defrosting control method of the air source heat pump unit is difficult to accurately judge the best time for the unit to enter a defrosting mode in time. Therefore, the air source heat pump unit comprises a refrigerant circulation loop and an outdoor heat exchanger arranged on the refrigerant circulation loop, an outdoor heat exchange fan is arranged near the outdoor heat exchanger, and the defrosting control method comprises the following steps: when the air source heat pump unit is in an operating state, acquiring the air speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger; calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger; according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, the air source heat pump unit is selectively controlled to enter a defrosting mode, so that the air source heat pump unit not only can effectively adapt to different natural conditions, but also can effectively realize accurate defrosting.
Description
Technical Field
The invention relates to the technical field of air conditioner defrosting, and particularly provides an air source heat pump unit and a defrosting control method thereof.
Background
In the strategic background of carbon peak reaching and carbon neutralization, the air source heat pump unit is more and more widely used. The air source heat pump unit comprises an indoor unit, an outdoor unit and a refrigerant circulation loop connected between the indoor unit and the outdoor unit, wherein the refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop, so that the room temperature is changed. In winter, the air source heat pump unit operates a heating working condition, the heat exchanger of the outdoor unit exchanges heat with outdoor cold air, when the evaporation temperature of a refrigerant is lower than zero, water vapor in the air is frozen on the surface of the outdoor heat exchanger, the process is frosting, especially under the condition that the outdoor environment has higher humidity, the outdoor heat exchanger is easy to generate frosting phenomenon, and along with continuous frosting, the heat exchange efficiency of the outdoor heat exchanger can also be sharply reduced, and then the heating quantity of the whole air source heat pump unit is continuously attenuated. Therefore, when the air source heat pump unit operates in a heating working condition, whether the outdoor heat exchanger generates a frosting phenomenon needs to be monitored frequently, and a proper time needs to be selected to enter a defrosting mode so as to avoid unnecessary energy loss.
The existing air source heat pump unit is usually to add a plurality of sensors on the air source heat pump unit in order to accurately obtain the frosting condition of the outdoor heat exchanger, and then the frosting condition of the outdoor unit is judged according to the measurement data of the sensors. Specifically, many existing air source heat pump units determine the frosting condition of the outdoor heat exchanger by measuring the coil temperature of the outdoor heat exchanger and the temperature or humidity of the outdoor environment. Although the frosting condition of the outdoor heat exchanger can be timely and accurately judged in the ordinary weather, in some extreme weather, such as the weather of sudden snow and the like, the outdoor temperature sharply drops and the humidity sharply rises, and the frosting speed of the outdoor heat exchanger is greatly accelerated, in this situation, the judgment mode is difficult to timely judge whether the outdoor heat exchanger needs to be defrosted, so that the air source heat pump unit cannot timely enter a defrosting mode, and the running efficiency of the air source heat pump unit is reduced.
Accordingly, there is a need in the art for a new air source heat pump unit and a defrosting control method thereof to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem, namely, the problem that the existing defrosting control method of the air source heat pump unit is difficult to accurately judge the optimal time for the unit to enter the defrosting mode in time.
In a first aspect, the present invention provides a defrosting control method for an air source heat pump unit, where the air source heat pump unit includes a refrigerant circulation loop and an outdoor heat exchanger disposed on the refrigerant circulation loop, an outdoor heat exchange fan is disposed near the outdoor heat exchanger, and the defrosting control method includes:
when the air source heat pump unit is in an operating state, acquiring the air speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger;
calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger.
In a preferred technical solution of the above defrosting control method, "selectively controlling the air source heat pump unit to enter a defrosting mode according to an average value of wind speeds at a plurality of sampling points on an air outlet side of the outdoor heat exchanger" includes:
comparing the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger with a preset wind speed;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the comparison result of the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger and the preset wind speed.
In a preferred technical solution of the above defrosting control method, the step of selectively controlling the air source heat pump unit to enter a defrosting mode according to a comparison result between an average value of wind speeds at a plurality of sampling points on an air outlet side of the outdoor heat exchanger and the preset wind speed includes:
if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger is less than or equal to the preset wind speed, further acquiring the wind speeds of the plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the wind speeds of multiple sampling points on the air outlet side of the outdoor heat exchanger acquired for multiple times.
In the preferred technical solution of the above defrosting control method, the step of "further obtaining the wind speeds at a plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times" specifically includes:
within a preset time, acquiring the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times;
the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the wind speeds of multiple sampling points on the air outlet side of the outdoor heat exchanger acquired for multiple times comprises the following specific steps:
and further selectively controlling the air source heat pump unit to enter a defrosting mode according to the wind speeds of multiple sampling points on the air outlet side of the outdoor heat exchanger acquired for multiple times within the preset time.
In a preferred technical scheme of the above defrosting control method, the step of further selectively controlling the air source heat pump unit to enter a defrosting mode according to the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired for a plurality of times within the preset time period specifically includes:
calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time;
comparing the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time length, with the preset wind speed;
and further selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired for a plurality of times within the preset time and the comparison result of the preset wind speed.
In a preferred technical solution of the above-mentioned defrosting control method, the step of further selectively controlling the air source heat pump unit to enter a defrosting mode according to a comparison result between the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which is obtained a plurality of times within the preset time period, and the preset wind speed "includes:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired for a plurality of times within the preset time is less than or equal to the preset wind speed, controlling the air source heat pump unit to enter a defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, the step of further selectively controlling the air source heat pump unit to enter a defrosting mode according to a comparison result between the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which is obtained for a plurality of times within the preset time period, and the preset wind speed "further includes:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time length, is greater than the preset wind speed, the air source heat pump unit is not controlled to enter a defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, the step of selectively controlling the air source heat pump unit to enter a defrosting mode according to a comparison result between an average value of wind speeds at a plurality of sampling points on an air outlet side of the outdoor heat exchanger and the preset wind speed specifically includes:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger is larger than the preset wind speed, the air source heat pump unit is not controlled to enter a defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, before the step of "comparing an average value of wind speeds at a plurality of sampling points on an air outlet side of the outdoor heat exchanger with a preset wind speed", the defrosting control method further includes:
acquiring the current wind speed of the outdoor heat exchange fan;
and determining the preset wind speed according to the current wind speed of the outdoor heat exchange fan.
In a second aspect, the present invention further provides an air source heat pump unit, which includes a controller configured to perform the defrosting control method described in any of the above preferred embodiments.
Under the condition of adopting the technical scheme, the air source heat pump unit comprises a refrigerant circulation loop and an outdoor heat exchanger arranged on the refrigerant circulation loop, wherein an outdoor heat exchange fan is arranged near the outdoor heat exchanger, and the defrosting control method for the air source heat pump unit comprises the following steps: when the air source heat pump unit is in an operating state, acquiring the air speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger; calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger; and selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger. Based on the control mode, the defrosting control method can accurately judge the frosting condition of the outdoor heat exchanger in time no matter under any outdoor environment, so that the problems of mistaken defrosting under the condition of no frost and frosting but not timely defrosting are effectively solved, and based on the defrosting control method, the unit not only can effectively adapt to different natural conditions, but also can effectively realize accurate defrosting, so that the air source heat pump unit can enter a defrosting mode in time, the heat exchange efficiency of the air source heat pump unit is effectively ensured, and the service life and the heat efficiency of the air source heat pump unit are effectively prolonged.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view showing an internal structure of an outdoor unit of an air source heat pump unit according to the present invention;
FIG. 2 is a plot of a plurality of sampling points on an outdoor heat exchanger;
FIG. 3 is a flow chart of the main steps of the defrost control method of the present invention;
FIG. 4 is a flow chart of the specific steps of a preferred embodiment of the defrost control method of the present invention;
reference numerals: 11. an outdoor heat exchanger; 12. an outdoor heat exchange fan; 13. an air outlet grille; 101. and (6) sampling points.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, the air source heat pump unit of the present invention may be a household type or a commercial type, which is not limited. Such changes in the application object do not depart from the basic principle of the present invention and belong to the protection scope of the present invention.
It should be noted that in the description of the preferred embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and the like, which indicate a connection relationship, should be interpreted broadly, for example, as being directly connected, indirectly connected through an intermediate, or internally connected between two elements, and thus should not be interpreted as limiting the present invention. In other words, specific meanings of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Further, it should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
Specifically, the air source heat pump unit comprises an indoor unit, an outdoor unit and a refrigerant circulation loop arranged between the indoor unit and the outdoor unit, wherein a refrigerant for performing circulating heat exchange indoors and outdoors flows through the refrigerant circulation loop, and an indoor heat exchanger, a compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve are arranged on the refrigerant circulation loop; the indoor heat exchanger is arranged in the indoor unit, an indoor heat exchange fan is arranged near the indoor heat exchanger, the outdoor heat exchanger is arranged in the outdoor unit, an outdoor heat exchange fan is arranged near the outdoor heat exchanger, a refrigerant continuously circulates between the indoor heat exchanger and the outdoor heat exchanger through the refrigerant circulation loop to realize heat exchange, and the reverse circulation of the refrigerant in the refrigerant circulation loop can be controlled when the four-way valve is reversed, so that the air source heat pump unit is switched between a cooling working condition and a heating working condition. It should be noted that, the invention does not limit the specific structure of the air source heat pump unit, and those skilled in the art can set the structure according to the actual use requirement; for example, specific types of the indoor heat exchanger and the outdoor heat exchanger, and specific types of the indoor heat exchange fan and the outdoor heat exchange fan, and the like.
Further, the air source heat pump unit further includes a controller and a plurality of wind speed detectors, the wind speed detectors can detect wind speed on the air outlet side of the outdoor heat exchanger, the controller can obtain the detection result of the wind speed detectors, and can also control the operation mode of the air source heat pump unit, and the like, which are not limited. It can be understood by those skilled in the art that the present invention does not limit the specific structure and type of the controller, and the controller may be the original controller of the air source heat pump unit, or may be a controller separately configured to execute the defrosting control method of the present invention, and those skilled in the art can set the structure and type of the controller according to the actual use requirement.
Referring to fig. 1 and 2, as shown in fig. 1 and 2, the outdoor heat exchange fan 12 is disposed between the outdoor heat exchanger 11 and the air outlet grille 13, and a direction indicated by an arrow in fig. 1 is an air outlet direction. Referring to the orientation in fig. 1, as a preferred arrangement, a plurality of wind speed detectors are disposed on the air-out side (i.e., the left side) of the outdoor heat exchanger 11, i.e., the side close to the outdoor heat exchange fan 12; as shown in fig. 2, in the preferred embodiment, the end surface of the outdoor heat exchanger 11 is rectangular, five sampling points 101 are provided on the outdoor heat exchanger 11, one of the sampling points is provided in the middle of the outdoor heat exchanger 11, the remaining four sampling points are provided at the four corners of the outdoor heat exchanger 11, respectively, and a wind speed detector is provided at each sampling point so as to detect the wind speed at the five sampling points.
It should be noted that, although the outdoor heat exchanger 11 described in the preferred embodiment is provided with five sampling points, the number and the arrangement manner of the sampling points are not limited, and those skilled in the art can set the sampling points according to actual use requirements. However, as an optimal setting mode, a plurality of sampling points can be set to include the middle sampling point and the peripheral sampling point that sets up around the middle sampling point to guarantee data acquisition's comprehensiveness to the at utmost, and then effectively guarantee the accuracy nature of judgement.
Referring next to fig. 3, fig. 3 is a flow chart illustrating the main steps of the defrost control method of the present invention. As shown in fig. 1, based on the air source heat pump unit described in the above embodiment, the control method of the present invention mainly includes the following steps:
s1: when the air source heat pump unit is in an operating state, acquiring the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger;
s2: calculating the average value of the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger;
s3: and selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of the five sampling points on the air outlet side of the outdoor heat exchanger.
Further, in step S1, when the air source heat pump unit is in an operating state, the controller can obtain the wind speeds at five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 through the wind speed detectors arranged at the five sampling points 101, so as to perform subsequent determination. It should be noted that, although the wind speeds at the five sampling points 101 are adopted for the determination in the preferred embodiment, this is not limitative, and a person skilled in the art can set the number of the sampling points 101 according to actual use requirements.
Next, in step S2, based on the wind speed information collected in step S1, an average value of wind speeds of five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 is calculated, so as to effectively ensure accuracy of data collection, and thus accuracy of a judgment result. Finally, in step S3, the controller can selectively control the air source heat pump unit to enter the defrosting mode according to the average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11.
It should be noted that, the present invention does not limit the above specific control method, and those skilled in the art can set the control method according to actual needs. In addition, the invention does not limit the specific operation of the air source heat pump unit in the defrosting mode, and the technical personnel in the field can set the operation according to the actual use requirement as long as the corresponding defrosting effect can be realized.
Referring next to fig. 2, fig. 2 is a flowchart illustrating the specific steps of a preferred embodiment of the defrost control method of the present invention. As shown in fig. 2, based on the air source heat pump unit described in the above embodiment, the defrosting control method according to the preferred embodiment of the present invention includes the following steps:
s101: when the air source heat pump unit is in an operating state, acquiring the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger;
s102: calculating the average value of the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger, and recording the average value as a first average value;
s103: judging whether the first average value is less than or equal to a preset wind speed or not; if not, executing step S104; if yes, go to step S105;
s104: the air source heat pump unit is not controlled to enter a defrosting mode;
s105: acquiring the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger for multiple times within a preset time length;
s106: calculating the average value of the wind speeds of five sampling points on the air outlet side of the outdoor heat exchanger obtained for multiple times within a preset time length, and recording the average value as a second average value;
s107: judging whether the second average value is less than or equal to a preset wind speed or not; if not, executing step S104; if yes, go to step S108;
s108: and controlling the air source heat pump unit to enter a defrosting mode.
Further, in step S101, when the air source heat pump unit is in an operating state, the controller can obtain the wind speeds at five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 through the wind speed detectors arranged at the five sampling points 101, so as to perform subsequent determination. It should be noted that, although the wind speed at five sampling points 101 is adopted for determination in the preferred embodiment, this is not a limitation, and a person skilled in the art can set the number of sampling points 101 according to actual use requirements.
Further, in step S102, based on the wind speed information of the five sampling points collected in step S101, an average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 is calculated and recorded as a first average value, so as to effectively ensure accuracy of data collection and further accuracy of the determination result. Specifically, in the preferred embodiment, the average value of the wind speeds at five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 is compared with the preset wind speed, that is, the first average value calculated in step S102 is compared with the preset wind speed, and the air source heat pump unit is selectively controlled to enter the defrosting mode according to the comparison result.
It should be noted that, the present invention does not limit the specific value of the preset wind speed, and those skilled in the art can set the value according to the actual use requirement. As a preferred setting mode, the determination mode of the preset wind speed is as follows: acquiring the current wind speed of the outdoor heat exchange fan 12, namely the wind speed when the outdoor heat exchange fan is not shielded by a foreign object, and determining the preset wind speed according to the current wind speed of the outdoor heat exchange fan 12; the corresponding frosting wind speed is also different under different fan wind speeds, so the variable value that the preset wind speed is set to be in a direct proportion relation with the current wind speed of the outdoor heat exchange fan 12 is set in the application, namely the larger the current wind speed of the outdoor heat exchange fan 12 is, the larger the preset wind speed is, the smaller the current wind speed of the outdoor heat exchange fan 12 is, the smaller the preset wind speed is, the specific corresponding relation is tested and finished before leaving a factory and is input into the controller to be directly used, and the outdoor heat exchanger 11 needs to be defrosted as long as the wind speed collected by the wind speed detector is less than or equal to the preset wind speed.
Next, based on the determination result in step S103, if the average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 is greater than the preset wind speed, that is, the first average value is greater than the preset wind speed, step S104 is executed, that is, the air source heat pump unit is not controlled to enter the defrosting mode. Meanwhile, if the average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 is less than or equal to the preset wind speed, the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 are further acquired for multiple times, and the air source heat pump unit is selectively controlled to enter a defrosting mode according to the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 acquired for multiple times.
As a preferred control mode, step S105 is executed, and the wind speeds of five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 are obtained for multiple times within the preset time period; it should be noted that, in the present invention, any limitation is not imposed on the specific value of the preset time and the specific times of acquiring the wind speed within the preset time, and a person skilled in the art can set the value according to the actual use requirement; preferably, the preset time duration is 30 seconds, so that the response speed can be effectively considered on the basis of effectively ensuring the judgment accuracy.
Then, step S106 is executed, and an average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 acquired multiple times within the preset time is calculated, that is, an average value of a plurality of wind speed values of the five sampling points 101 acquired multiple times is calculated and recorded as a second average value, so as to ensure the accuracy of data acquisition to the maximum extent, and further effectively ensure the accuracy of the determination result. Specifically, in the preferred embodiment, the average value of the wind speeds of five sampling points 101 at the air outlet side of the outdoor heat exchanger 11 collected multiple times within the preset time period is compared with the preset wind speed, that is, the second average value calculated in step S106 is compared with the preset wind speed, and according to the comparison result, the air source heat pump unit is selectively controlled to enter the defrosting mode.
Finally, based on the judgment result in step S103, if the average value of the wind speeds of the five sampling points 101 at the air outlet side of the outdoor heat exchanger 11 obtained multiple times within the preset time is less than or equal to the preset wind speed, step S108 is executed, that is, the air source heat pump unit is controlled to enter a defrosting mode. And if the average value of the wind speeds of the five sampling points 101 on the air outlet side of the outdoor heat exchanger 11 acquired for multiple times within the preset time is greater than the preset wind speed, executing the step S104, namely, not controlling the air source heat pump unit to enter a defrosting mode.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method for an air source heat pump unit comprises a refrigerant circulation loop and an outdoor heat exchanger arranged on the refrigerant circulation loop, wherein an outdoor heat exchange fan is arranged near the outdoor heat exchanger, and the defrosting control method comprises the following steps:
when the air source heat pump unit is in an operating state, acquiring the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger;
calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger.
2. The defrosting control method according to claim 1, wherein the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to an average value of wind speeds at a plurality of sampling points on the air outlet side of the outdoor heat exchanger specifically comprises:
comparing the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger with a preset wind speed;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the comparison result of the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger and the preset wind speed.
3. The defrosting control method according to claim 2, wherein the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the comparison result between the average value of the wind speeds at the plurality of sampling points on the air outlet side of the outdoor heat exchanger and the preset wind speed specifically comprises:
if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger is less than or equal to the preset wind speed, further acquiring the wind speeds of the plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the wind speeds of multiple sampling points on the air outlet side of the outdoor heat exchanger acquired for multiple times.
4. The defrosting control method according to claim 3, wherein the step of further acquiring the wind speeds at a plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times specifically comprises:
within a preset time length, acquiring the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger for a plurality of times;
the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired for a plurality of times specifically comprises the following steps:
and further selectively controlling the air source heat pump unit to enter a defrosting mode according to the wind speeds of multiple sampling points on the air outlet side of the outdoor heat exchanger acquired for multiple times within the preset time.
5. The defrosting control method according to claim 4, wherein the step of further selectively controlling the air source heat pump unit to enter the defrosting mode according to the wind speeds of the plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired a plurality of times within the preset time period specifically comprises:
calculating the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time;
comparing the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time length, with the preset wind speed;
and further selectively controlling the air source heat pump unit to enter a defrosting mode according to the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time, and the comparison result of the preset wind speed.
6. The defrosting control method according to claim 5, wherein the step of further selectively controlling the air source heat pump unit to enter the defrosting mode according to the comparison result between the average value of the wind speeds of the plurality of sampling points on the air outlet side of the outdoor heat exchanger, which is obtained a plurality of times within the preset time period, and the preset wind speed comprises:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger acquired for a plurality of times within the preset time is less than or equal to the preset wind speed, controlling the air source heat pump unit to enter a defrosting mode.
7. The defrosting control method according to claim 5, wherein the step of further selectively controlling the air source heat pump unit to enter the defrosting mode according to the comparison result between the average value of the wind speeds of the plurality of sampling points on the air outlet side of the outdoor heat exchanger, which is obtained a plurality of times within the preset time period, and the preset wind speed further comprises:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger, which are obtained for a plurality of times within the preset time, is greater than the preset wind speed, the air source heat pump unit is not controlled to enter a defrosting mode.
8. The defrosting control method according to claim 2, wherein the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the comparison result between the average value of the wind speeds at the plurality of sampling points on the air outlet side of the outdoor heat exchanger and the preset wind speed specifically comprises:
and if the average value of the wind speeds of a plurality of sampling points on the air outlet side of the outdoor heat exchanger is larger than the preset wind speed, the air source heat pump unit is not controlled to enter a defrosting mode.
9. The defrosting control method according to any one of claims 2 to 8, wherein before the step of "comparing an average value of wind speeds at a plurality of sampling points on the air-out side of the outdoor heat exchanger with a preset wind speed", the defrosting control method further comprises:
acquiring the current wind speed of the outdoor heat exchange fan;
and determining the preset wind speed according to the current wind speed of the outdoor heat exchange fan.
10. An air source heat pump unit, characterized in that the air source heat pump unit comprises a controller configured to be able to execute the defrosting control method of any one of claims 1 to 9.
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| CN202210850771.4A CN115307340A (en) | 2022-07-19 | 2022-07-19 | Air source heat pump unit and defrosting control method thereof |
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