CN117346357A - Defrosting control method of heat pump unit and related equipment - Google Patents

Defrosting control method of heat pump unit and related equipment Download PDF

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Publication number
CN117346357A
CN117346357A CN202311554440.7A CN202311554440A CN117346357A CN 117346357 A CN117346357 A CN 117346357A CN 202311554440 A CN202311554440 A CN 202311554440A CN 117346357 A CN117346357 A CN 117346357A
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CN
China
Prior art keywords
defrosting
defrosted
outdoor unit
outdoor
defrosting mode
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311554440.7A
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Chinese (zh)
Inventor
赵恒君
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Shenzhen Oribo Technology Co Ltd
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Shenzhen Oribo Technology Co Ltd
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Application filed by Shenzhen Oribo Technology Co Ltd filed Critical Shenzhen Oribo Technology Co Ltd
Priority to CN202311554440.7A priority Critical patent/CN117346357A/en
Publication of CN117346357A publication Critical patent/CN117346357A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/136—Defrosting or de-icing; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/242—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/269—Time, e.g. hour or date
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data

Abstract

The application provides a defrosting control method and related equipment of a heat pump unit, wherein the defrosting control method comprises the following steps: receiving working state information of an outdoor unit to be defrosted in a heat pump unit; judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information; if so, the outdoor unit is controlled to enter a defrosting mode. After receiving the working state information of the outdoor unit to be defrosted in the heat pump unit, judging that the heating quantity generated by the rest outdoor unit in the heating mode still can meet the heating requirement before the outdoor unit enters the defrosting mode, and then judging that the outdoor unit to be defrosted enters the defrosting mode so as to ensure that the heating requirement of a user is met.

Description

Defrosting control method of heat pump unit and related equipment
Technical Field
The application belongs to the technical field of heat pump control, and particularly relates to a defrosting control method of a heat pump unit and related equipment.
Background
The heat pump unit is used as a device for acquiring clean energy from air, and is adopted by a medium-sized and large-sized building, for example, the heat pump unit is used for supplying heat, for example, after entering a heating mode, the heat pump unit heats water in a water system of the medium-sized and large-sized building, so that the heat supply of the medium-sized and large-sized building is realized.
However, in the operation under the low temperature working condition, the outdoor unit of the heat pump unit may be frosted, and when frosting is performed to a certain extent, the frosted outdoor unit needs to enter a defrosting mode, and the outdoor unit entering the defrosting mode does not perform heating, so that the heating amount is reduced, and the heat pump unit cannot meet the heating requirement.
Disclosure of Invention
In view of this, the embodiments of the present application provide a defrosting control method for a heat pump unit and related devices, so as to solve the problem that in the operation process of the heat pump unit, the heating capacity is reduced due to the fact that the outdoor unit enters the defrosting mode, and the preset heating requirement cannot be met.
The first aspect of the present application provides a defrosting control method for a heat pump unit, including: receiving working state information of an outdoor unit to be defrosted in a heat pump unit; judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information; if so, the outdoor unit is controlled to enter a defrosting mode.
By adopting the defrosting control method of the heat pump unit, after the working state information of the outdoor unit to be defrosted in the heat pump unit is received, before the outdoor unit enters the defrosting mode, the rest of heating quantity generated by the outdoor unit in the heating mode is judged to still meet the heating requirement, and then the outdoor unit to be defrosted is judged to enter the defrosting mode, so that the heating requirement of a user is met.
In some embodiments of the first aspect, the method further includes receiving operating status information of an outdoor unit to be defrosted in the heat pump unit: receiving working state information of an outdoor unit in a heating mode in a heat pump unit; the information is the first number of the outdoor units to be defrosted in the heat pump unit and the second number of the outdoor units in the heating mode, wherein the first number is the total number of the outdoor units to be defrosted, the second number is the total number of the outdoor units in the heating mode, and the rated heating quantity of all the outdoor units is the same; judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information; if yes, the outdoor unit is controlled to enter a defrosting mode, specifically: judging whether the heating quantity of the heat pump unit meets the heating requirement after the outdoor unit enters the defrosting mode according to the first quantity and the second quantity, and if so, controlling the outdoor unit to be defrosted to enter the defrosting mode.
In some embodiments of the first aspect, a method of controlling an outdoor unit to enter a defrost mode includes: if the first quantity and the second quantity meet the condition that the first quantity is smaller than the second quantity multiplied by a preset ratio; and controlling all the outdoor units to be defrosted to enter a defrosting mode.
In some embodiments of the first aspect, a method of controlling an outdoor unit to enter a defrost mode includes: if the first quantity and the second quantity meet the condition that the first quantity is larger than or equal to the second quantity multiplied by a preset ratio; and controlling all the outdoor units to be defrosted to enter a defrosting mode in turn so as to avoid excessive outdoor units entering the defrosting mode, thereby causing that the heating quantity of the heat pump unit can not meet the heating requirement.
In some embodiments of the first aspect, controlling all outdoor units to be defrosted to enter a defrosting mode in turn further includes: confirming the defrosting waiting time of all outdoor units to be defrosted; sequencing all the outdoor units to be defrosted according to the defrosting waiting time, wherein the longer the defrosting waiting time of the outdoor units to be defrosted is, the higher the priority of the outdoor units to be defrosted is; and controlling the outdoor unit to be defrosted to enter a defrosting mode according to the priority order from high to low.
In some embodiments of the first aspect, controlling all outdoor units to be defrosted to enter a defrosting mode in turn further includes: confirming low pressure values of all outdoor units to be defrosted; if the low pressure value is smaller than or equal to the low pressure value threshold value and the duration is a first preset duration, determining that the outdoor unit to be defrosted is a target outdoor unit; the control target outdoor unit preferentially enters a defrosting mode, and the rest outdoor units to be defrosted alternately enter the defrosting mode.
In some embodiments of the first aspect, the method further comprises: confirming defrosting duration of an outdoor unit entering a defrosting mode; if the defrosting duration is longer than the preset defrosting duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode; or confirming the high pressure value of the outdoor unit entering the defrosting mode; and if the high pressure value is greater than the high pressure threshold value and the duration of the high pressure value is a second preset duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode.
The second aspect of the present application also provides a controller, comprising: a processor, and; a memory for storing executable instructions of the processor; wherein execution of the executable instructions by the processor causes the controller to perform the defrost control method described above.
The third aspect of the present application further provides a heat pump unit, which includes a controller, where the controller is configured to implement the defrosting control method described above.
A fourth aspect of the present application also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the defrost control method described above.
Drawings
Fig. 1 is a schematic structural diagram of a heat pump unit according to an embodiment of the present application.
Fig. 2 is a flow chart of a defrosting control method of a heat pump unit according to an embodiment of the present application.
Fig. 3 is another flow chart of a defrosting control method of the heat pump unit according to the embodiment of the application.
Fig. 4 is an application scenario diagram of a defrosting control method of a heat pump unit according to an embodiment of the present application.
Fig. 5 is another application scenario diagram of a defrosting control method of a heat pump unit according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a controller according to an embodiment of the present application.
Detailed Description
The term "plurality" as used herein refers to two or more. In addition, it should be understood that in the description of this application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying any relative importance or order.
The following briefly describes the case of the related art:
the heat pump unit is used as a device for acquiring clean energy from air, and is adopted by a medium-sized and large-sized building, for example, the heat pump unit is used for supplying heat, for example, after entering a heating mode, the heat pump unit heats water in a water system of the medium-sized and large-sized building, so that the heat supply of the medium-sized and large-sized building is realized.
However, in the operation under the low temperature working condition, the outdoor unit of the heat pump unit may be frosted, and when frosting is performed to a certain extent, the frosted outdoor unit needs to enter a defrosting mode, and the outdoor unit entering the defrosting mode does not perform heating, so that the heating amount is reduced, and the heat pump unit cannot meet the heating requirement.
In view of this, the embodiments of the present application provide a defrosting control method for a heat pump unit, a controller, and a storage medium, so as to solve the problem that in the operation process of the heat pump unit, the heating amount decreases due to the fact that the outdoor unit enters the defrosting mode, and the preset heating requirement cannot be met.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a heat pump unit 100 according to an embodiment of the present application, and the heat pump unit 100 includes a controller 10 and a plurality of outdoor units 20. The controller 10 controls the plurality of outdoor units 20 to enter and exit the defrosting mode to control the number of the outdoor units 20 entering the defrosting mode in the heat pump unit, thereby ensuring the heating amount generated by the outdoor units 20 in the heat pump unit.
It will be appreciated that the outdoor unit 20 includes a compressor, a heat exchanger including a fin heat exchanger and a plate heat exchanger. When the outdoor unit 20 is in the heating mode, the refrigerant flows into the fin heat exchanger after hot water is prepared by the plate heat exchanger, and external heat is absorbed by the fin heat exchanger to convert the liquid refrigerant into gaseous refrigerant, so that external heat is also absorbed, and the surface temperature of the fin heat exchanger is reduced. When the air flows through the evaporator, if the temperature of the fin heat exchanger is lower than the dew point temperature of the air and the surface temperature of the fin heat exchanger is lower than 0 ℃, water of the fin heat exchanger is separated out to form a frost layer, namely frosting.
When the outdoor unit 20 enters the defrost mode, the heat exchanger (condenser) releases heat to the outside through the fin heat exchanger, converting the gaseous refrigerant into the liquid refrigerant. When releasing heat to the outside, the frost layer on the fin heat exchanger can be melted along with the released heat, and the defrosting effect is achieved. Meanwhile, the outdoor unit entering the defrost mode does not perform heating, which may result in a decrease in heating amount.
The heat pump assembly 100 may be switched among a heating mode, a to-be-defrosted mode, and a defrosting mode. The heat pump unit 100 includes an outdoor unit 20 and an end device, that is, the outdoor unit 20 and the end device may also be switched among a heating mode, a standby mode and a to-be-defrosted mode, where the to-be-defrosted mode includes the outdoor unit 20 gradually frosted during the operation of the outdoor unit 20 in the heating mode, and the to-be-defrosted outdoor unit 20 having a frosted degree reaching a requirement of entering the defrosting mode, stopping the operation of the heating mode, and entering the standby mode. Both the outdoor unit 20 and the terminal equipment are provided with heat exchangers. In the heating mode, the heat exchanger of the outdoor unit 20 is used as an evaporator, and the heat exchanger of the terminal device is used as a condenser, so as to realize heat supply of the heat pump unit 100. In the defrosting mode, the heat exchanger of the outdoor unit 20 is used as a condenser, and the heat exchanger of the terminal equipment is used as an evaporator.
It will be appreciated that the temperature of the fin heat exchanger will also vary as the heat exchanger of the outdoor unit 20 exchanges heat with the outside. The inner side or the outer side of the fin heat exchanger is provided with a temperature sensor. The temperature sensor is used for sensing the pipeline temperature of the fin heat exchanger. The outdoor unit 20 further includes an ambient temperature sensor disposed outside the heat exchanger for sensing a temperature of an environment outside the heat exchanger.
Referring to fig. 2, fig. 2 is a flow chart of a defrosting control method of a heat pump unit according to an embodiment of the present application, where the defrosting control method is applied to a controller of the heat pump unit, and the defrosting control method includes the following steps:
step S101: and receiving the working state information of the outdoor unit to be defrosted in the heat pump unit.
The outdoor unit 20 to be defrosted refers to an outdoor unit 20 requiring defrosting, and may be an outdoor unit 20 satisfying a defrosted condition in a heating mode and a standby mode. The defrosted condition may be set according to actual conditions, for example, the defrosted condition is that the temperature Ta of the heat exchanger external environment is smaller than a first value and the temperature Te of the fin heat exchanger is smaller than a second value.
The controller 10 of the heat pump unit 100 receives operation state information of the outdoor units 20 to be defrosted in the heat pump unit 100, wherein the operation state information includes a first number of the outdoor units 20 to be defrosted in the heat pump unit 100, and the first number is a total number of the outdoor units 20 to be defrosted.
In other embodiments, the method further includes receiving operation state information of the outdoor units 20 in the heating mode in the heat pump unit 100, the operation state information further includes operation state information of the outdoor units 20 in the heating mode, the operation state information of the outdoor units 20 in the heating mode includes a second number of the outdoor units 20 in the heating mode, the second number is a total number of the outdoor units 20 in the heating mode, and heating amounts of all the outdoor units 20 are the same.
In other embodiments, the heating amount of the outdoor unit 20 refers to the rated heating amount of the outdoor unit 20.
Step S102: and judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information.
That is, after the outdoor unit 20 to be defrosted is judged to enter the defrosting mode according to the operation state information of the outdoor unit 20, the heating amount provided by the outdoor unit 20 except the outdoor unit 20 entering the defrosting mode is sufficient to satisfy the heating requirement.
It can be appreciated that, in a certain application scenario, the heating requirement may be a temperature requirement, for example, the temperature requirement set by the user is 60 ℃, and the heat pump unit 100 prepares the water with a lower temperature to 60 ℃ by controlling the outdoor unit 20 to operate in the heating mode.
In the operation process, it is required to determine whether the heating amount that the heat pump unit 100 can currently output can prepare the water temperature to the temperature requirement, that is, whether the heating amount that the heat pump unit 100 can currently output is enough to prepare the high water temperature.
It can be understood that, in a certain application scenario, the heating requirement may be a requirement of maintaining a temperature, for example, the temperature requirement set by the user is 60 ℃, and the hot water consumption is large at this time, and the heat pump unit 100 maintains the hot water consumption and maintains the hot water temperature at 60 ℃ by controlling the outdoor unit 20 to operate in the heating mode.
Therefore, it is necessary to determine whether the heating capacity of the heat pump unit 100 satisfies the heating requirement after the outdoor unit 20 to be defrosted enters the defrosting mode before the outdoor unit 20 to be defrosted enters the defrosting mode.
Step S103: if so, the outdoor unit is controlled to enter a defrosting mode.
After determining that the outdoor unit 20 enters the defrosting mode, if the heating capacity of the heat pump unit 100 meets the heating requirement, the outdoor unit 20 to be defrosted is controlled to enter the defrosting mode.
In summary, after receiving the operating status information of the outdoor unit 20 to be defrosted in the heat pump unit 100, it is determined that the remaining heating capacity of the outdoor unit 20 in the heating mode can still meet the heating requirement before the outdoor unit 20 enters the defrosting mode, and then it is determined that the outdoor unit 20 to be defrosted enters the defrosting mode to ensure that the heating requirement of the user is met.
In some embodiments, referring to fig. 3, fig. 3 is a flow chart of a defrosting control method of a heat pump unit according to an embodiment of the present application, where the defrosting control method is applied to a controller of the heat pump unit, and the defrosting control method includes the following steps:
step S201: and receiving the working state information of the outdoor unit in a heating mode in the heat pump unit.
The working state information is a first number of the outdoor units 20 to be defrosted in the heat pump unit 100 and a second number of the outdoor units 20 in the heating mode. The first number is the total number of the outdoor units 20 to be defrosted, and the second number is the total number of the outdoor units 20 in the heating mode.
Step S202, judging whether the heating quantity of the heat pump unit meets the heating requirement after the outdoor unit enters a defrosting mode according to the first quantity and the second quantity.
It can be understood that, when the outdoor unit 20 in the defrosting mode is not in the heating mode and no heating amount is generated, the total amount of heating amount that can be generated by the heat pump unit 100 can be calculated according to the total amount of the outdoor units 20 in the heating mode. The total heating amount can determine whether the heating amount of the heat pump unit 100 satisfies the heating requirement after the outdoor unit 20 is determined to enter the defrosting mode.
Step S203, if yes, the outdoor unit to be defrosted is controlled to enter a defrosting mode.
Specifically, after determining that the heating capacity of the heat pump unit 100 meets the heating requirement, in one embodiment, controlling the outdoor unit 20 to be defrosted to enter the defrosting mode includes the following steps:
step S2031, if the first quantity and the second quantity satisfy that the first quantity is smaller than the second quantity multiplied by a preset ratio.
Step S2032, controlling all the outdoor units to be defrosted to enter a defrosting mode.
The preset ratio is less than 1. In one example, referring to fig. 4, the preset ratio is one half, the operating state information received by the controller 10 is that the number of all the outdoor units 20 to be defrosted is 3, the number of the outdoor units 20 in the heating mode is 9, and half of the number of the outdoor units 20 in the heating mode is 4.5. That is, the number of 3 outdoor units 20 to be defrosted is less than 4.5 which is half of the number of 9 outdoor units 20 of the heating mode. At this time, the controller 10 controls all of the outdoor units 207, 208, and 209 to be defrosted to enter a defrosting mode.
In other embodiments, controlling the outdoor unit 20 to be defrosted to enter the defrosting mode further includes the steps of:
step S2033: if the first quantity and the second quantity meet the condition that the first quantity is larger than or equal to the second quantity multiplied by a preset ratio.
Step S2034: and controlling all the outdoor units to be defrosted to enter a defrosting mode in turn so as to avoid excessive outdoor units entering the defrosting mode and further reduce the output water temperature of the heat pump unit.
In one example, referring to fig. 5, the preset ratio is 1/2, the operating status information received by the controller 10 is that the number of all the outdoor units 20 to be defrosted is 6, the number of the outdoor units 20 in the heating mode is 8, and half of the number of the outdoor units 20 in the heating mode is 4. That is, 6 outdoor units 20 to be defrosted are more than 4 half of the number of the 8 heating mode outdoor units 20. At this time, the controller 10 controls 6 outdoor units 20 to be defrosted, i.e., all of the outdoor units 203, 204, 205, 206, 207 and 208 to be defrosted, to enter the defrosting mode in turn, i.e., after the outdoor unit 203 enters the defrosting mode, to complete defrosting, after exiting the defrosting mode, the outdoor unit 204 enters the defrosting mode again, and so on until the outdoor unit 208 also completes defrosting.
It can be appreciated that affecting the drop in the temperature of the output water of the current heat pump unit 100 includes the following:
1) The output water temperature of the current heat pump unit 100 needs to maintain a certain temperature value, and after the defrosting outdoor unit 20 enters the defrosting mode, the refrigerating capacity in the defrosting mode is affected, thereby causing the drop of the water temperature; 2) The current heat pump unit 100 has an increasing outlet water temperature, and the outdoor unit 20 to be defrosted enters a defrosting mode, and the cooling capacity in the defrosting mode is affected, resulting in a decrease in the outlet water temperature during the increasing outlet water temperature.
Therefore, whether the heating requirement is satisfied is first determined by the first number of the outdoor units 20 to be defrosted and the second number of the outdoor units 20 in the heating mode, and if so. And then, the mode of determining that the outdoor units 20 to be defrosted enter the defrosting mode according to the first number and the second number, that is, the number of the outdoor units 20 to be defrosted enter the defrosting mode, for example, whether all the outdoor units 20 to be defrosted enter the defrosting mode together or all the outdoor units 20 to be defrosted enter the defrosting mode in turn. The number of the outdoor units 20 entering the defrost mode can be more precisely judged while the heating demand is satisfied by the heat pump unit 100 without affecting the output water temperature.
It will be appreciated that if too many outdoor units 20 are controlled to enter the defrost mode during the same period of time, too much cooling capacity is generated by the plurality of outdoor units 20, which suddenly reduces the heat supplied by the heat pump unit 100, resulting in water temperature fluctuations in the water system. According to the embodiment of the invention, whether the first number of the outdoor units 20 to be defrosted is smaller than the second number of the outdoor units 20 in the heating mode is compared, wherein the first number is smaller than the second number multiplied by the preset ratio, and the preset ratio is smaller than 1, so that all the outdoor units 20 to be defrosted are controlled to enter the defrosting mode, or all the outdoor units 20 to be defrosted are controlled to enter the defrosting mode in turn, thereby avoiding the influence of the refrigerating capacity generated by the outdoor units 20 entering the defrosting mode in the heat pump unit 100 on the water temperature of the water system, and reducing the water temperature fluctuation of the water system.
It can be understood that, in a certain application scenario, when the preset ratio is 1/2, that is, the first number of the outdoor units 20 to be defrosted is less than half of the second number of the outdoor units 20 in the heating mode, the refrigeration capacity generated when all the outdoor units 20 to be defrosted enter the defrosting mode will not affect the output water temperature of the heat pump unit 100, and at this time, all the outdoor units 20 to be defrosted can be controlled to enter the defrosting mode. When the first number of the outdoor units 20 to be defrosted is greater than or equal to half of the second number of the outdoor units 20 in the heating mode, the cooling capacity generated when all the outdoor units 20 to be defrosted enter the defrosting mode affects the output water temperature of the heat pump unit 100, and at this time, all the outdoor units 20 to be defrosted are controlled to enter the defrosting mode in turn.
In some embodiments, controlling all outdoor units to be defrosted to enter a defrosting mode in turn further includes the steps of:
step S301: and confirming the defrosting waiting time of all the outdoor units to be defrosted.
The operating state information also includes a waiting defrost period. The waiting defrosting time period is a time period from when the outdoor unit 20 satisfies the defrosteable condition. For example, if the outdoor unit 206 is in the nth hour of the heating mode, the controller 10 confirms that the outdoor unit 206 satisfies the defrosteable condition, starts the defrosting waiting period M hours for the outdoor unit 206, and confirms that the defrosting waiting period M hours for the outdoor unit 206 is n+m.
Step S302: and sequencing the priorities of all the outdoor units to be defrosted according to the defrosting waiting time.
The longer the waiting defrosting time period of the outdoor unit 20 to be defrosted, the higher the priority of the outdoor unit 20 to be defrosted. In one example, referring again to fig. 5, the waiting defrosting durations of the outdoor units 203, 204, 205, 206, 207, 208 to be defrosted are sequentially increased, and the priorities of the outdoor units 203, 204, 205, 206, 207, 208 to be defrosted are sequentially increased. The result of the prioritization of the outdoor units 203, 204, 205, 206, 207, and 208 to be defrosted according to the waiting defrosting time period is shown in table 1 below.
TABLE 1 results of prioritization
Outdoor unit to be defrosted Waiting for defrosting time Priority level
208 M+5 0
207 M+4 1
206 M+3 2
205 M+2 3
204 M+1 4
203 M 5
The outdoor unit 208 to be defrosted has the highest priority, the outdoor unit 207 to be defrosted has the second highest priority, the outdoor unit 206 to be defrosted has the third highest priority, and the outdoor unit 203 to be defrosted has the lowest priority.
Step S303: and controlling all the outdoor units to be defrosted to enter a defrosting mode according to the priority order from high to low.
As shown in table 1, the controller 10 controls the outdoor unit 208 to be defrosted having the highest priority to enter the defrosting mode first, and controls the outdoor unit 207 to be defrosted having the second highest priority to enter the defrosting mode after the outdoor unit 208 to be defrosted completes defrosting. After the outdoor unit 207 to be defrosted completes defrosting. Next, the outdoor unit 206 to be defrosted with the third highest priority is controlled to enter a defrosting mode, and after the outdoor unit 206 completes defrosting. Finally, the method includes the steps of. The outdoor unit 203 to be defrosted with the lowest control priority enters the defrosting mode.
It will be appreciated that the longer the waiting defrosting time of the outdoor unit 20 to be defrosted, the longer the frosting time in the outdoor unit 20, the thicker the frost layer, and the excessive thickness of the frost layer increases the risk of freezing the pipeline. Therefore, the outdoor unit 20 to be defrosted, which is controlled to wait for a longer defrosting time period, is first in the defrosting mode, and the risk of freezing damage to the pipelines of the outdoor unit 20 to be defrosted can be reduced.
In some embodiments, controlling all outdoor units to be defrosted to enter a defrosting mode in turn further includes the steps of:
step S401: and confirming the low-pressure values of all the outdoor units to be defrosted.
It will be appreciated that the low pressure value refers to the refrigerant pressure value at the suction side of the compressor, which in this embodiment may be the refrigerant pressure value at the suction side of the compressor.
It is understood that the outdoor unit 20 further includes a pressure sensor, which may be provided to the suction port of the compressor, for detecting the pressure of the refrigerant at the suction side. When the outdoor unit 20 is in the heating mode, that is, when the outdoor heat exchanger is used as an evaporator, the liquid refrigerant is evaporated into a gaseous refrigerant, and the refrigerant has an evaporation pressure during the transition between the liquid state and the gaseous state. Meanwhile, when the outdoor unit 20 is used as an evaporator, the evaporation pressure value sensed by the pressure sensor at this time may also be referred to as a low pressure value.
Step S402: if the low pressure value is smaller than or equal to the low pressure value threshold, and the duration is a first preset duration, determining that the outdoor unit to be defrosted is a target outdoor unit.
Step S403: the control target outdoor unit enters a defrost mode.
The low pressure value threshold may be set according to an actual situation, and the first preset duration may also be set according to an actual situation.
It can be understood that, in the heating mode, when the evaporator of the outdoor unit 20 to be defrosted absorbs heat to the outside, the fin heat exchanger will frost, the thicker the frost layer, the lower the heat absorbing capacity of the evaporator to the outside, the lower the low pressure of the refrigerant will be, and when the low pressure value is smaller than the threshold value of the low pressure value and the duration is the first preset duration, the serious degree of frost formation of the outdoor unit 20 to be defrosted will be indicated, the evaporator will not absorb heat any more, and the defrosting mode will need to be immediately entered.
Step S404: and controlling the rest outdoor units to be defrosted except the target outdoor unit to enter a defrosting mode in turn.
It can be understood that after the outdoor unit 20 to be defrosted with serious frost is first turned into the defrosting mode, the remaining outdoor units 20 to be defrosted are alternately turned into the defrosting mode.
In one example, the controller 10 may determine that the outdoor unit 204 to be defrosted is a target outdoor unit and control the target outdoor unit to enter the defrosting mode, wherein the low pressure value of the outdoor unit 204 to be defrosted is less than or equal to the low pressure value threshold value of 1bar and the duration is a first preset duration of 5 s. Next, the controller 10 controls the remaining 6 outdoor units 208, 207, 206, 205, and 203 to be defrosted to alternately enter the defrost mode, and in one example, the outdoor units 208, 207, 206, 205, and 203 may be controlled to alternately enter the defrost mode according to the sequencing result of table 1.
It can be understood that when the target outdoor units are satisfied, the target outdoor units may be plural, and when the plural outdoor units to be defrosted satisfy that the low pressure value is less than or equal to the low pressure value threshold value of 1bar and the duration is 5s, the target outdoor units are plural, and the plural target outdoor units are controlled to enter the defrosting mode.
In some embodiments, the defrost control method further comprises:
step S501: the defrosting duration of the outdoor unit entering the defrosting mode is confirmed.
The defrosting duration refers to a period from a time when the outdoor unit 20 starts defrosting to a current defrosting time.
Step S502: and if the defrosting duration is longer than the preset defrosting duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode.
The preset defrosting time period refers to a time period required for the outdoor unit 20 to remove frost, and can be set according to actual conditions. It will be appreciated that the duration of defrosting of the outdoor unit 20 is longer than the preset defrosting duration, which indicates that the frost layer formed on the outdoor unit 20 has been melted away, and the defrosting mode can be exited.
In one example, when the controller 10 obtains the defrosting duration of the outdoor unit 204 in the defrosting mode to be 14min and is greater than the preset defrosting duration for 10min, the controller 10 controls the outdoor unit 204 to exit the defrosting mode.
In some embodiments, the defrost control method further comprises:
step S601: and acquiring a high-pressure value of the outdoor unit entering the defrosting mode.
The high pressure refers to the refrigerant pressure at the discharge side of the compressor, and in this embodiment, the high pressure value may be the refrigerant pressure value at the discharge port of the compressor.
When the outdoor unit 20 is in the defrost mode, the heat exchanger of the outdoor unit 20 is used as a condenser, and at this time, the pressure at which the compressor delivers the refrigerant into the condenser may be referred to as a high-pressure value. That is, when the outdoor unit 20 enters the defrost mode, the pressure sensor senses that the pressure of the refrigerant at the discharge port of the compressor is a high pressure value. It is understood that the high pressure value of the outdoor unit 20 is the refrigerant pressure value at the discharge side of the compressor, and thus, the pressure value sensed by the pressure sensor at this time may also be referred to as a high pressure value.
Step S602: and if the high pressure value is greater than the high pressure threshold value and the duration of the high pressure value is a second preset duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode.
The high pressure threshold may be set according to an actual situation, and the second preset duration may also be set according to an actual situation. It will be appreciated that in the defrosting process, the frost layer on the fin heat exchanger melts along with the released heat, the heat released to the outside is accelerated, the high pressure value increases along with the increase of the outside temperature, and when the high pressure value is greater than the high pressure threshold, and the duration of the high pressure value is a second preset duration, which indicates that the outdoor unit 20 may have removed the frost layer formed, at this time, the controller 10 may control the outdoor unit 20 to exit the defrosting mode.
In one example, the controller 10 acquires that the high pressure value of the outdoor unit 204 in the defrost mode is 50bar, the high pressure threshold value is 41bar, and the duration of the high pressure value of 50bar is 1s, and then the controller 10 controls the outdoor unit 204 to exit the defrost mode.
In some embodiments, the defrost control method further comprises:
step S701: and acquiring the turn-off condition of a high-voltage switch of the outdoor unit entering the defrosting mode.
It will be appreciated that the heat pump unit 100 further includes a plurality of compressors, and the discharge port of each compressor is connected to the inlet port of the heat exchanger of each outdoor unit 20. In the defrost mode, the compressor discharges high-temperature and high-pressure gaseous refrigerant through the discharge port, and the gaseous refrigerant flows into the outdoor unit 20 through the intake port. The high-voltage switch is arranged at the exhaust port, and when the pressure of the exhaust port is larger than the safety pressure threshold, the high-voltage switch can be automatically disconnected, so that the high-voltage protection of the heat pump unit 100 is realized.
It is understood that the high pressure refers to the refrigerant pressure at the discharge side of the compressor, which in this embodiment may be the refrigerant pressure at the discharge of the compressor.
Step S702: and if the high-voltage switch is turned off, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode.
It will be appreciated that if the high-voltage switch is turned off, the gaseous refrigerant discharged from the compressor cannot enter the condenser, and the condenser cannot continue defrosting, at this time, the outdoor unit 20 entering the defrosting mode may be controlled to exit the defrosting mode.
It will be appreciated that the controller 10 may then enter the heating mode after controlling the outdoor unit to exit the defrosting mode, thereby providing heating capacity for the water system, reducing the cooling capacity of the outdoor unit, and further increasing the total heating capacity of the heat pump unit 100.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a controller 10 according to an embodiment of the present application. In one embodiment, the controller 10 includes a memory 11 and at least one processor 12. It will be appreciated by those skilled in the art that the configuration of the controller 10 shown in fig. 6 is not limiting of the embodiments of the present application, and that the controller 10 may also include additional hardware or software, more or less than that shown, or a different arrangement of components.
As an alternative embodiment, the controller 10 includes a terminal capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and its hardware includes, but is not limited to, a microprocessor, an application specific integrated circuit, a programmable gate array, a digital processor, an embedded device, and the like. As an alternative embodiment, the memory 11 is used for storing program codes and various data. The Memory 11 may include any other medium readable by a computer, such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), or programmable Read-Only Memory (Programmable Read-Only Memory, PROM), which can be used to carry or store data.
As an alternative embodiment, the at least one processor 12 may comprise an integrated circuit, for example, an integrated circuit that may comprise a single package, or may comprise a plurality of integrated circuits packaged with the same function or different functions, including a microprocessor, a digital processing chip, a combination of a graphics processor and various control chips, and the like. The at least one processor 12 is a Control Unit (Control Unit) of the controller 10, and executes various functions of the controller 10 and processes data by running or executing programs or modules stored in the memory 11, and calling data stored in the memory 11. The memory 11 has stored therein program code, and the at least one processor 12 may invoke the program code stored in the memory 11 to perform related functions. In one embodiment of the present application, the memory 11 stores a plurality of instructions that are executed by the at least one processor 12 to implement the defrost control method described above.
The embodiment of the application also provides a storage medium. Wherein the storage medium has stored therein computer instructions that, when executed on a computing device, cause the computing device to perform the defrost control method provided by the foregoing embodiments.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A defrost control method for a heat pump unit, the method comprising:
receiving working state information of an outdoor unit to be defrosted in the heat pump unit;
judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information;
and if so, controlling the outdoor unit to enter a defrosting mode.
2. The defrosting control method according to claim 1, wherein the operation state information of the outdoor unit to be defrosted in the heat pump unit is received, the method further comprising:
receiving working state information of the outdoor unit in a heating mode in the heat pump unit;
the information is a first number of the outdoor units to be defrosted in the heat pump unit and a second number of the outdoor units in a heating mode, wherein the first number is the total number of the outdoor units to be defrosted, the second number is the total number of the outdoor units in the heating mode, and the heating amounts of all the outdoor units are the same;
judging whether the heating quantity of the heat pump unit meets the heating requirement or not after the outdoor unit enters a defrosting mode according to the information;
if yes, controlling the outdoor unit to enter a defrosting mode, specifically:
judging whether the heating quantity of the heat pump unit meets the heating requirement after the outdoor unit enters a defrosting mode according to the first quantity and the second quantity,
and if so, controlling the outdoor unit to be defrosted to enter a defrosting mode.
3. The defrosting control method according to claim 2, wherein the control of the outdoor unit to enter a defrosting mode includes:
if the first quantity and the second quantity meet that the first quantity is smaller than the second quantity by multiplying a preset ratio;
and controlling all the outdoor units to be defrosted to enter a defrosting mode.
4. The defrosting control method according to claim 2, wherein the control of the outdoor unit to enter a defrosting mode includes:
if the first quantity and the second quantity meet that the first quantity is larger than or equal to the second quantity multiplied by a preset ratio;
and controlling all the outdoor units to be defrosted to enter a defrosting mode in turn so as to avoid excessive outdoor units entering the defrosting mode, thereby causing that the heating quantity of the heat pump unit cannot meet the heating requirement.
5. The defrosting control method as set forth in claim 4, wherein said controlling all of the outdoor units to be defrosted to enter a defrosting mode in turn further includes:
confirming the defrosting waiting time of all the outdoor units to be defrosted;
the priority ranking is carried out on all the outdoor units to be defrosted according to the duration of waiting for defrosting, wherein the longer the duration of waiting for defrosting is, the higher the priority of the outdoor units to be defrosted is;
and controlling the outdoor unit to be defrosted to enter a defrosting mode according to the priority order from high to low.
6. The defrosting control method as set forth in claim 4, wherein said controlling all of the outdoor units to be defrosted to enter a defrosting mode in turn further includes:
confirming low-pressure values of all the outdoor units to be defrosted;
if the low pressure value is smaller than or equal to the low pressure value threshold value and the duration is a first preset duration, determining that the outdoor unit to be defrosted is a target outdoor unit;
and controlling the target outdoor unit to enter a defrosting mode preferentially, and alternately entering the defrosting mode by the rest outdoor units to be defrosted.
7. The defrosting control method according to claim 3 or 4, characterized in that the method further comprises:
confirming defrosting duration of the outdoor unit entering a defrosting mode;
if the defrosting duration is longer than the preset defrosting duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode; or alternatively
Confirming a high pressure value of the outdoor unit entering a defrosting mode;
and if the high pressure value is larger than the high pressure threshold value and the duration of the high pressure value is a second preset duration, controlling the outdoor unit entering the defrosting mode to exit the defrosting mode.
8. A controller, comprising:
a processor, and;
a memory for storing executable instructions of the processor;
wherein execution of the executable instructions by the processor causes the controller to perform the defrost control method of any one of claims 1 to 7.
9. A heat pump unit comprising a controller for implementing the defrost control method according to any one of claims 1 to 7.
10. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the defrost control method of any one of claims 1 to 7.
CN202311554440.7A 2023-11-17 2023-11-17 Defrosting control method of heat pump unit and related equipment Pending CN117346357A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311554440.7A CN117346357A (en) 2023-11-17 2023-11-17 Defrosting control method of heat pump unit and related equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311554440.7A CN117346357A (en) 2023-11-17 2023-11-17 Defrosting control method of heat pump unit and related equipment

Publications (1)

Publication Number Publication Date
CN117346357A true CN117346357A (en) 2024-01-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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