CN105588267A - Defrosting control method and device for automatically detecting frost quantity of heat pump system - Google Patents
Defrosting control method and device for automatically detecting frost quantity of heat pump system Download PDFInfo
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- CN105588267A CN105588267A CN201510287207.6A CN201510287207A CN105588267A CN 105588267 A CN105588267 A CN 105588267A CN 201510287207 A CN201510287207 A CN 201510287207A CN 105588267 A CN105588267 A CN 105588267A
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- 238000010257 thawing Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000002360 preparation method Methods 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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Abstract
An embodiment of the invention discloses a defrosting control method and device for automatically detecting frost quantity of a heat pump system, relates to the technical field of heat pumps, and can solve the problem that a heat pump system of an air conditioner in the prior art cannot accurately control defrosting time of an outdoor heat exchanger so that the heat pump system of the air conditioner is poor in thermal comfort. According to a specific scheme, the method comprises the following steps: judging whether running time of the heat pump system is greater than or equal to first preset time or not; when the running time of the heat pump system is greater than or equal to the first preset time, acquiring initial power of an outdoor fan, maximum power of the outdoor fan and the temperature of a liquid tube of an outdoor heat exchanger, wherein the maximum power of the outdoor fan is a maximum value of the running power of the outdoor fan in the running time of the heat pump system; and determining the defrosting starting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of the liquid tube of the outdoor heat exchanger. The defrosting control method and device are used for defrosting the heat pump system.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a defrosting control method and device for automatically detecting the frosting amount of a heat pump system.
Background
The air-conditioning heat pump system 10 is shown in fig. 1 and comprises a compressor 101, a four-way reversing valve 102, an indoor heat exchanger 103, a throttling device 104, an outdoor heat exchanger 105 and an outdoor fan 106, wherein the outdoor fan 106 provides heat exchange air flow for the outdoor heat exchanger 105. When the air-conditioning heat pump system 10 is in a heating state, refrigerant is compressed by the compressor 101 and then is changed into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the indoor heat exchanger 103 through the four-way reversing valve 102, the high-temperature high-pressure gas releases heat through the indoor heat exchanger 103 and is changed into high-temperature high-pressure liquid, the high-temperature high-pressure liquid is changed into low-temperature low-pressure liquid through the throttling device 104, the low-temperature low-pressure liquid absorbs heat through the outdoor heat exchanger 105, the low-temperature low-pressure gas is changed. In the air conditioning heat pump system 10, during heating, the outdoor heat exchanger 105 is in a low-temperature and low-pressure state, and normally, when the temperature of the outdoor heat exchanger 105 is lower than 0 ℃, a frosting phenomenon occurs on the outer surface of the outdoor heat exchanger 105. The formation of the frost layer of the outdoor heat exchanger 105 reduces the heat transfer coefficient of the outdoor heat exchanger 105, and meanwhile, the existence of the frost layer increases the resistance of the air flowing through the outdoor heat exchanger 105, reduces the heating performance of the air-conditioning heat pump system 10, thereby affecting the heating effect of the heat pump system. In order to ensure efficient operation of the air conditioning system, the outer surface of the outdoor heat exchanger 105 needs to be periodically defrosted.
In the prior art, the liquid pipe temperature and the defrosting time of the outdoor heat exchanger 105 are detected as conditions for judging whether the heat pump system 10 starts defrosting or finishes defrosting, however, in the process of detecting the liquid pipe temperature and the defrosting time of the outdoor heat exchanger 105, due to factors such as outdoor environment temperature or external load of an air conditioning system, which easily cause misjudgment, the air conditioning heat pump system 10 starts defrosting when the frosting amount of the outdoor heat exchanger 105 is very small, and thus the thermal comfort of the air conditioning heat pump system 10 is poor.
Disclosure of Invention
The embodiment of the invention provides a defrosting control method and device for automatically detecting the frosting amount of a heat pump system, which can solve the problem that in the prior art, the air-conditioning heat pump system cannot accurately control the defrosting time of an outdoor heat exchanger, so that the thermal comfort of the air-conditioning heat pump system is poor.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the present invention provides a defrosting control method for automatically detecting frosting amount of a heat pump system, which is applied to a controller, the controller controls the heat pump system to defrost, the heat pump system includes an outdoor fan and an outdoor heat exchanger, the outdoor fan provides heat exchange airflow to the outdoor heat exchanger, and the method includes:
judging whether the running time of the heat pump system is greater than or equal to a first preset time or not;
when the running time of the heat pump system is greater than or equal to a first preset time, acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger, wherein the maximum power of the outdoor fan is the maximum value of the running power of the outdoor fan in the running time of the heat pump system;
and determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
In a second aspect, an embodiment of the present invention provides a controller, where the controller controls a heat pump system to perform defrosting, the heat pump system includes an outdoor fan and an outdoor heat exchanger, and the outdoor fan provides a heat exchange airflow to the outdoor heat exchanger, and the controller includes:
the processing unit is used for judging whether the running time of the heat pump system is greater than or equal to a first preset time or not;
the heat pump system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger when the running time of the heat pump system is greater than or equal to a first preset time, and the maximum power of the outdoor fan is the maximum value of the running power of the outdoor fan in the running time of the heat pump system;
and the execution unit is used for determining that the heat pump system starts a defrosting mode according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
According to the defrosting control method and device for automatically detecting the frosting amount of the heat pump system, provided by the embodiment of the invention, a controller controls the heat pump system to defrost, the heat pump system comprises an outdoor fan and an outdoor heat exchanger, the outdoor fan provides heat exchange airflow for the outdoor heat exchanger, and whether the running time of the heat pump system is greater than or equal to a first preset time or not is judged; if the running time of the heat pump system is greater than or equal to a first preset time, acquiring the initial power of an outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of an outdoor heat exchanger, wherein the maximum power of the outdoor fan is the maximum value of the running power of the indoor fan and the maximum value of the running power of the outdoor fan in the running time of the heat pump system; and determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger. Therefore, in the process of heating of the air-conditioning heat pump system, after the heat pump system runs for a period of time, the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger can be obtained, and then whether the heat pump system starts defrosting or not is judged according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger, so that the problem that in the prior art, the defrosting time of the outdoor heat exchanger cannot be accurately controlled by the air-conditioning heat pump system, and the thermal comfort of the air-conditioning heat pump system is poor can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a heat pump system in the prior art according to the present embodiment;
fig. 2 is a schematic flow chart of a defrosting control method for automatically detecting the frosting amount of a heat pump system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a relationship between a first threshold and an outdoor ambient temperature according to the present embodiment;
fig. 4 is a schematic diagram illustrating a relationship between a second threshold and an outdoor ambient temperature according to this embodiment;
fig. 5 is a schematic flow chart of another defrosting control method for automatically detecting the frosting amount of a heat pump system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a defrosting control method for automatically detecting the frosting amount of a heat pump system, which is applied to a controller, wherein the controller controls the heat pump system to defrost, the heat pump system comprises an outdoor fan and an outdoor heat exchanger, the outdoor fan provides heat exchange airflow for the outdoor heat exchanger, and as shown in figure 2, the defrosting control method for automatically detecting the frosting amount of the heat pump system comprises the following steps:
201. and judging whether the running time of the heat pump system is greater than or equal to a first preset time.
Alternatively, the first preset time may be any value in the range of 25 minutes to 40 minutes, and preferably, the first preset time may be 25 minutes, where the specific value of the first preset time is not limited by the present invention.
202. And when the running time of the heat pump system is greater than or equal to a first preset time, acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
The maximum power of the outdoor fan is the maximum value of the operating power of the indoor fan and the outdoor fan in the operating time of the heat pump system. After the heat pump system starts to operate, the operating power of the outdoor fan at any time point in the operating time of the heat pump system is obtained, and the maximum power of the outdoor fan can be obtained by comparing the operating powers of the outdoor fans. The operating power of the outdoor fan is equal to the working current of the outdoor fan and the working voltage of the outdoor fan, optionally, the working current of the outdoor fan may be obtained through a current sensor, and of course, the working current of the outdoor fan may also be obtained through other manners, and the present invention is not limited specifically herein. The operating voltage of the outdoor fan may be 220V or 380V, and in this embodiment, the operating voltage of the outdoor fan is not limited in the present invention.
Optionally, the temperature of the liquid pipe of the outdoor heat exchanger may be detected by a temperature sensor, and of course, may also be detected by other manners, and here, how to detect the temperature of the liquid pipe of the outdoor heat exchanger is not particularly limited in the present invention.
Optionally, obtaining the initial power of the outdoor fan includes:
the method comprises the steps of obtaining the operating power of n time points in a preset period of an outdoor fan, wherein n is an integer larger than 0.
The value of the preset period may be any value within a range of 60 seconds to 100 seconds, preferably, the value of the preset period is 80 seconds, and the specific value of the preset period is not limited in the present invention. The value of n may be 4, 5, or 6, or may be other values. Preferably, when the value of the preset period is 80 seconds and the value of n is 6, the operating powers at n time points in the preset period of the outdoor fan, that is, the operating powers at 6 time points in the outdoor fan 80 are obtained, and preferably, the following are respectively: an operation power when the outdoor fan operates for 30 seconds, an operation power when the outdoor fan operates for 40 seconds, an operation power when the outdoor fan operates for 50 seconds, an operation power when the outdoor fan operates for 60 seconds, an operation power when the outdoor fan operates for 70 seconds, and an operation power when the outdoor fan operates for 80 seconds. In this embodiment, the reason why the value is taken from the operating power when the outdoor fan is operated for 30 seconds is that the operating power of the outdoor fan is not stable in the first 30 seconds of the operation of the outdoor fan, and if the value is taken from the first 30 seconds of the operation of the outdoor fan, the accuracy of the initial power of the outdoor fan is affected.
And calculating the average value of the running power of n time points in the preset period of the outdoor fan.
After the operating power at 6 time points within 80 seconds of the outdoor fan is obtained, the operating power at the time when the outdoor fan operates for 30 seconds, the operating power at the time when the outdoor fan operates for 40 seconds, the operating power at the time when the outdoor fan operates for 50 seconds, the operating power at the time when the outdoor fan operates for 60 seconds, the operating power at the time when the outdoor fan operates for 70 seconds, and the operating power at the time points of 6 time points within 80 seconds of the outdoor fan are added and summed, and then divided by 6, so that the average value of the operating power at the 6 time points within 80 seconds of the outdoor fan can be obtained.
And the average value of the running power of n time points in the preset period of the outdoor fan is the initial power of the outdoor fan.
After obtaining the average value of the operating powers at 6 time points within 80 seconds of the outdoor fan, the average value of the operating powers at 6 time points within 80 seconds of the outdoor fan is used as the initial power of the outdoor fan, and thus the initial power of the outdoor fan is obtained.
For example, if the values of the operating powers obtained at 6 time points within 80 seconds of the outdoor fan are respectively: the operation power when the outdoor fan operates for 30 seconds is 504, the operation power when the outdoor fan operates for 40 seconds is 517, the operation power when the outdoor fan operates for 50 seconds is 531, the operation power when the outdoor fan operates for 60 seconds is 553, the operation power when the outdoor fan operates for 70 seconds is 578 and the operation power when the outdoor fan operates for 80 seconds is 617, the operation powers at the 6 time points are added and summed, and then divided by 6, so that an average value 550 of the operation powers at the 6 time points within 80 seconds of the outdoor fan can be obtained, and the average value 550 of the operation powers at the 6 time points within 80 seconds of the outdoor fan is used as the initial power of the outdoor fan, so that the initial power 550 of the outdoor fan is obtained.
203. And determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
The defrosting mode is started to indicate the heat pump system to start entering a defrosting state, so that the heating capacity of the heat pump system is prevented from being reduced due to a frost layer on the outer surface of the outdoor heat exchanger, and the normal operation of the heat pump system is prevented from being influenced.
Therefore, in the process of heating of the air-conditioning heat pump system, after the heat pump system runs for a period of time, the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger can be obtained, and then whether the heat pump system starts defrosting or not is judged according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger, so that the problem that in the prior art, the defrosting time of the outdoor heat exchanger cannot be accurately controlled by the air-conditioning heat pump system, and the thermal comfort of the air-conditioning heat pump system is poor can be solved.
With reference to step 203, optionally, determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan, and the temperature of the liquid pipe of the outdoor heat exchanger, including:
when it is determined that the product of the initial power of the outdoor fan and the first frosting amount ratio is less than or equal to the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger is less than or equal to a first threshold value; or, when it is determined that the product of the initial power of the outdoor fan and the first frosting amount ratio is greater than the maximum power of the outdoor fan and the temperature of the liquid pipe of the outdoor heat exchanger is less than or equal to the second threshold, the heat pump system starts the defrosting preparation mode.
Wherein the frosting amount ratio is defined as a ratio at which frosting of the outdoor heat exchanger causes an increase in power consumption of the outdoor fan motor. Alternatively, the first frosting amount ratio may be any value in the range of 1.05 to 1.16, and preferably, the first frosting amount ratio is 1.15, and here, the present invention is not limited with respect to a specific value of the first frosting amount ratio.
For example, the initial power of the outdoor fan is 550, the first frost amount ratio is 1.15, and the first threshold is-16 degrees celsius, and if the maximum power of the outdoor fan is 680 and the temperature of the liquid pipe of the outdoor heat exchanger is-18 degrees celsius, it may be determined that these values satisfy the condition: the product of the initial power of the outdoor fan and the first frosting amount ratio is less than or equal to the maximum power of the outdoor fan, the temperature of a liquid pipe of the outdoor heat exchanger is less than or equal to a first threshold value, and the heat pump system can start a defrosting preparation mode.
Or, for example, the initial power of the outdoor fan is 550, the first frost amount ratio is 1.15, and the second threshold value is-21 degrees celsius, and if the maximum power of the outdoor fan is 610 and the temperature of the liquid pipe of the outdoor heat exchanger is-22 degrees celsius, it may be determined that these values satisfy the condition: the product of the initial power of the outdoor fan and the first frosting amount ratio is larger than the maximum power of the outdoor fan, the temperature of a liquid pipe of the outdoor heat exchanger is smaller than or equal to a second threshold value, and similarly, the heat pump system can start a defrosting preparation mode.
As shown in fig. 3, the first threshold varies with the variation of the outdoor ambient temperature and increases with the increase of the outdoor ambient temperature, and the relationship may be as shown by a curve a in fig. 3, for example, when the outdoor ambient temperature has a value of-13 degrees celsius, the first threshold is-16 degrees celsius. Similarly, in conjunction with fig. 4, the second threshold varies with the change of the outdoor ambient temperature and increases with the increase of the outdoor ambient temperature, and the relationship may be as shown by curve B in fig. 4, for example, when the outdoor ambient temperature has a value of-13 degrees celsius, the second threshold is-21 degrees celsius.
And when the time that the heat pump system is in the defrosting preparation mode is determined to be greater than or equal to the second preset time, the heat pump system starts the defrosting mode.
Alternatively, the second preset time may be any value in the range of 8 minutes to 11 minutes, and preferably, the second preset time is 9 minutes, where the specific value of the second preset time is not limited by the invention. When the time that the heat pump system is in the defrosting preparation mode reaches 9 minutes, the defrosting mode can be started, and the frost layer on the outer surface of the outdoor heat exchanger is defrosted.
In this embodiment, when the heat pump system defrosts the outer surface of the outdoor heat exchanger, the heating mode enters the defrosting preparation mode, and then the defrosting preparation mode performs the defrosting mode, so as to defrost the outer surface of the outdoor heat exchanger. The reason that the heat pump system is not directly switched to the defrosting mode from the heating mode is that the defrosting preparation mode can play a role in buffering, so that the balance of switching pressure parameters is ensured in the process of switching the heat pump system from the heating mode to the defrosting mode, the heat pump system is further ensured to be normally switched to the defrosting mode from the heating mode, and the outer surface of the outdoor heat exchanger is defrosted.
Optionally, when it is determined that the time for the heat pump system to start the defrosting preparation mode is greater than or equal to a second preset time, the heat pump system starts the defrosting mode, including:
and when the product of the initial power of the outdoor fan and the second frosting amount ratio is determined to be larger than the maximum power of the outdoor fan, and the temperature of a liquid pipe of the outdoor heat exchanger is larger than a second threshold value, the heat pump system starts a first defrosting mode.
Otherwise, the heat pump system turns on the second defrost mode.
Alternatively, the second frosting amount ratio may be any value within the range of 1.2 to 1.35, and preferably, the second frosting amount ratio is 1.32, and here, the present invention is not limited with respect to a specific value of the second frosting amount ratio.
For example, the initial power of the outdoor fan is 550, the second frosting amount ratio is 1.32, and the second threshold value is-21 degrees celsius, and if the maximum power of the outdoor fan is 700 degrees celsius and the temperature of the liquid pipe of the outdoor heat exchanger is-19 degrees celsius, it may be determined that these values satisfy the condition: the product of the initial power of the outdoor fan and the second frosting amount ratio is larger than the maximum power of the outdoor fan, the temperature of a liquid pipe of the outdoor heat exchanger is larger than a second threshold value, and the heat pump system can start a first defrosting mode; if the condition is not met, the heat pump system may initiate a second defrost mode.
Optionally, when the heat pump system starts the first defrosting mode, the heat pump system operates at the first frequency to defrost, and the defrosting time of the heat pump system is less than or equal to a third preset time.
Or,
when the heat pump system starts the second defrosting mode, the heat pump system operates at the second frequency for defrosting, and the defrosting time of the heat pump system is greater than or equal to the fourth preset time.
The first frequency may be any value within a range of less than or equal to 50Hz, and the specific value of the first frequency is not limited herein. The third predetermined time may be less than or equal to 2 minutes, and the invention is not limited to the specific value of the third predetermined time.
Alternatively, the second frequency may be any value within a range of greater than or equal to 80Hz, and the invention is not limited to specific values of the second frequency. The fourth predetermined time may be greater than or equal to 8 minutes, and the specific value of the fourth predetermined time is not limited in the present invention.
For example, when the condition is satisfied: the product of the initial power of the outdoor fan and the second frosting amount ratio is larger than the maximum power of the outdoor fan, and when the temperature of a liquid pipe of the outdoor heat exchanger is larger than a second threshold value, the frosting amount of the outer surface of the outdoor heat exchanger is not much, at the moment, the heat pump system starts a first defrosting mode, namely, the heat pump system operates at the frequency of less than or equal to 50Hz, and the defrosting time is less than or equal to 2 minutes, so that when the frosting amount is not much, the heat pump system operates at a lower frequency for defrosting, and the influence on the heating process of the heat pump system can be reduced as much as possible on the basis of defrosting. When the condition is not met, the frosting amount of the outer surface of the outdoor heat exchanger is large, at the moment, the heat pump system starts a second defrosting mode, namely a compressor in the heat pump system operates and defrosts at the frequency of more than or equal to 80Hz, and the defrosting time is more than or equal to 8 minutes.
In the present embodiment, when the heat pump system determines defrosting of the outdoor heat exchanger, as shown in fig. 5:
501. judging whether the running time of the heat pump system is greater than or equal to a first preset time or not;
502. when the operation time of the heat pump system is greater than or equal to a first preset time, acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger, and when the operation time of the heat pump system is less than the first preset time, repeatedly executing the step 501;
503. judging whether a first preset condition is met, if not, executing step 504, and if so, executing step 505, wherein the first preset condition is as follows: the product of the initial power of the outdoor fan and the first frosting amount ratio is less than or equal to the maximum power of the outdoor fan, and the temperature of a liquid pipe of the outdoor heat exchanger is less than or equal to a first threshold value;
504. judging whether a second preset condition is met, if so, executing step 505, and if not, executing step 501, wherein the second preset condition is as follows: the product of the initial power of the outdoor fan and the first frosting amount ratio is larger than the maximum power of the outdoor fan, and the temperature of a liquid pipe of the outdoor heat exchanger is smaller than or equal to a second threshold value;
505. the heat pump system starts a defrosting preparation mode;
506. judging whether the time of the heat pump system in the defrosting preparation mode is greater than or equal to second preset time or not; if yes, go to step 507, otherwise go to step 505;
507. judging whether a third preset condition is met, if so, executing step 508, and if not, executing step 509, wherein the third preset condition is as follows: the product of the initial power of the outdoor fan and the second frosting amount ratio is larger than the maximum power of the outdoor fan, and the temperature of a liquid pipe of the outdoor heat exchanger is larger than a second threshold value;
508. the heat pump system starts a first defrosting mode;
509. the heat pump system initiates a second defrost mode.
According to the defrosting control method and device for automatically detecting the frosting amount of the heat pump system, provided by the embodiment of the invention, a controller controls the heat pump system to defrost, the heat pump system comprises an outdoor fan and an outdoor heat exchanger, the outdoor fan provides heat exchange airflow for the outdoor heat exchanger, and whether the running time of the heat pump system is longer than a first preset time or not is judged; if the running time of the heat pump system is longer than the first preset time, acquiring the initial power of an outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of an outdoor heat exchanger, wherein the maximum power of the outdoor fan is the maximum value of the running power of the indoor fan and the maximum power of the outdoor fan in the running time of the heat pump system; and determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger. Therefore, in the process of heating of the air-conditioning heat pump system, after the heat pump system runs for a period of time, the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger can be obtained, and then whether the heat pump system starts defrosting or not is judged according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger, so that the problem that in the prior art, the defrosting time of the outdoor heat exchanger cannot be accurately controlled by the air-conditioning heat pump system, and the thermal comfort of the air-conditioning heat pump system is poor can be solved.
Based on the embodiments corresponding to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, an embodiment of the present invention provides a controller 60, where the controller 60 controls a heat pump system to defrost, the heat pump system includes an outdoor fan and an outdoor heat exchanger, and the outdoor fan provides a heat exchange airflow to the outdoor heat exchanger, as shown in fig. 6, the controller 60 includes:
the processing unit 601 is configured to determine whether an operation time of the heat pump system is greater than or equal to a first preset time.
The obtaining unit 602 is configured to obtain an initial power of an outdoor fan, a maximum power of the outdoor fan, and a temperature of a liquid pipe of an outdoor heat exchanger when an operation time of the heat pump system is greater than or equal to a first preset time, where the maximum power of the outdoor fan is a maximum value of an operation power of the outdoor fan in the operation time of the heat pump system.
And the execution unit 603 is configured to determine, according to the initial power of the outdoor fan, the maximum power of the outdoor fan, and the temperature of the liquid pipe of the outdoor heat exchanger, that the heat pump system starts a defrosting mode.
Optionally, the execution unit 603 is further configured to, when it is determined that a product of the initial power of the outdoor fan and the first frost formation amount ratio is less than or equal to the maximum power of the outdoor fan, and the liquid pipe temperature of the outdoor heat exchanger is less than or equal to a first threshold; or, when it is determined that the product of the initial power of the outdoor fan and the first frosting amount ratio is greater than the maximum power of the outdoor fan and the temperature of the liquid pipe of the outdoor heat exchanger is less than or equal to a second threshold, the defrosting preparation mode is turned on.
And the execution unit 603 is further configured to start the defrosting mode when it is determined that the time that the heat pump system is in the defrosting preparation mode is greater than or equal to a second preset time.
Optionally, the execution unit 603 is further configured to start the first defrosting mode when it is determined that a product of the initial power of the outdoor fan and the second frosting amount ratio is greater than the maximum power of the outdoor fan and the temperature of the liquid pipe of the outdoor heat exchanger is greater than a second threshold; otherwise, the execution unit starts the second defrosting mode.
Optionally, when the execution unit 603 starts the first defrosting mode, the heat pump system operates at the first frequency to defrost, and the defrosting time of the heat pump system is less than or equal to a third preset time;
or,
when the execution unit 603 starts the second defrosting mode, the heat pump system operates at the second frequency for defrosting, and the defrosting time of the heat pump system is greater than or equal to the fourth preset time.
Optionally, the obtaining unit 602 is further configured to obtain operating powers at n time points in a preset period of the outdoor fan, where n is an integer greater than 0.
The obtaining unit 602 is further configured to calculate an average value of the operating powers at n time points in a preset period of the outdoor fan; and the average value of the running power of n time points in the preset period of the outdoor fan is the initial power of the outdoor fan.
In the controller provided by the embodiment of the invention, the processing unit is used for judging whether the running time of the heat pump system is greater than or equal to a first preset time; the acquisition unit is used for acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger when the running time of the heat pump system is greater than or equal to a first preset time, wherein the maximum power of the outdoor fan is the maximum value of the running power of the outdoor fan in the running time of the heat pump system; the execution unit is used for determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger. Therefore, in the process of heating of the air-conditioning heat pump system, after the heat pump system runs for a period of time, the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger can be obtained, and then whether the heat pump system starts defrosting or not is judged according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger, so that the problem that in the prior art, the defrosting time of the outdoor heat exchanger cannot be accurately controlled by the air-conditioning heat pump system, and the thermal comfort of the air-conditioning heat pump system is poor can be solved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A defrosting control method for automatically detecting frosting amount of a heat pump system is applied to a controller, the controller controls the heat pump system to defrost, the heat pump system comprises an outdoor fan and an outdoor heat exchanger, the outdoor fan provides heat exchange airflow for the outdoor heat exchanger, and the defrosting control method is characterized by comprising the following steps:
judging whether the running time of the heat pump system is greater than or equal to a first preset time or not;
when the running time of the heat pump system is greater than or equal to a first preset time, acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger, wherein the maximum power of the outdoor fan is the maximum value of the running power of the outdoor fan in the running time of the heat pump system;
and determining the defrosting mode of the heat pump system according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
2. The method of claim 1, wherein said determining that the heat pump system is in the defrost mode based on the initial power of the outdoor fan, the maximum power of the outdoor fan, and the liquid tube temperature of the outdoor heat exchanger comprises:
when it is determined that the product of the initial power of the outdoor fan and the first frost formation amount ratio is less than or equal to the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger is less than or equal to a first threshold value; or, when it is determined that the product of the initial power of the outdoor fan and the first frosting amount ratio is greater than the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger is less than or equal to a second threshold, the heat pump system starts a defrosting preparation mode;
and when the time that the heat pump system is in the defrosting preparation mode is determined to be greater than or equal to a second preset time, the heat pump system starts the defrosting mode.
3. The method of claim 2, wherein when it is determined that the time the heat pump system is in the defrost preparation mode is greater than or equal to a second preset time, the heat pump system initiates the defrost mode comprising:
when the product of the initial power of the outdoor fan and the second frosting amount ratio is determined to be larger than the maximum power of the outdoor fan, and the temperature of a liquid pipe of the outdoor heat exchanger is larger than a second threshold value, the heat pump system starts a first defrosting mode;
otherwise, the heat pump system starts a second defrost mode.
4. The method of claim 3,
when the heat pump system starts a first defrosting mode, the heat pump system operates at a first frequency for defrosting, and the defrosting time of the heat pump system is less than or equal to a third preset time;
or,
and when the heat pump system starts a second defrosting mode, the heat pump system operates at a second frequency for defrosting, and the defrosting time of the heat pump system is greater than or equal to a fourth preset time.
5. The method according to any one of claims 1-4, wherein said obtaining an initial power of said outdoor fan comprises:
acquiring the operating power of n time points in a preset period of the outdoor fan, wherein n is an integer greater than 0;
calculating the average value of the running power of n time points in the preset period of the outdoor fan;
and the average value of the running power of n time points in the outdoor fan preset period is the initial power of the outdoor fan.
6. A controller, the controller controls a heat pump system to defrost, the heat pump system includes an outdoor fan, an outdoor heat exchanger, the outdoor fan provides a heat exchange air flow to the outdoor heat exchanger, the controller includes:
the processing unit is used for judging whether the running time of the heat pump system is greater than or equal to a first preset time or not;
the heat pump system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger when the running time of the heat pump system is greater than or equal to a first preset time, and the maximum power of the outdoor fan is the maximum value of the running power of the outdoor fan in the running time of the heat pump system;
and the execution unit is used for determining that the heat pump system starts a defrosting mode according to the initial power of the outdoor fan, the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger.
7. The controller of claim 6,
the execution unit is further used for determining that the product of the initial power of the outdoor fan and the first frosting amount ratio is smaller than or equal to the maximum power of the outdoor fan, and the liquid pipe temperature of the outdoor heat exchanger is smaller than or equal to a first threshold; or, when it is determined that the product of the initial power of the outdoor fan and the first frosting amount ratio is greater than the maximum power of the outdoor fan and the temperature of a liquid pipe of the outdoor heat exchanger is less than or equal to a second threshold, starting a defrosting preparation mode;
the execution unit is further used for starting the defrosting mode when the time that the heat pump system is in the defrosting preparation mode is determined to be greater than or equal to a second preset time.
8. The controller of claim 7,
the execution unit is further used for starting a first defrosting mode when the product of the initial power of the outdoor fan and the second frosting amount ratio is determined to be larger than the maximum power of the outdoor fan and the liquid pipe temperature of the outdoor heat exchanger is larger than a second threshold; otherwise, the execution unit starts a second defrosting mode.
9. The controller of claim 8,
when the execution unit starts a first defrosting mode, the heat pump system operates at a first frequency for defrosting, and the defrosting time of the heat pump system is less than or equal to a third preset time;
or,
when the execution unit starts a second defrosting mode, the heat pump system operates at a second frequency for defrosting, and the defrosting time of the heat pump system is greater than or equal to a fourth preset time.
10. The controller according to any one of claims 6 to 9,
the acquiring unit is further configured to acquire operating powers of n time points within a preset period of the outdoor fan, where n is an integer greater than 0;
the acquiring unit is further configured to calculate an average value of the operating powers at n time points within a preset period of the outdoor fan; and the average value of the running power of n time points in the outdoor fan preset period is the initial power of the outdoor fan.
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