CN111006375A - Heating anti-freezing control method and device for ground source heat pump unit - Google Patents
Heating anti-freezing control method and device for ground source heat pump unit Download PDFInfo
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- CN111006375A CN111006375A CN201911340679.8A CN201911340679A CN111006375A CN 111006375 A CN111006375 A CN 111006375A CN 201911340679 A CN201911340679 A CN 201911340679A CN 111006375 A CN111006375 A CN 111006375A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
The invention provides a heating anti-freezing control method and a device for a ground source heat pump unit, wherein the method comprises the following steps: the method comprises the steps that an air conditioner outdoor unit receives a heating instruction sent by an air conditioner indoor unit; when a heating instruction is executed, controlling a compressor of an air conditioner outdoor unit to start heating; after controlling a compressor to start to heat, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit; when the first water temperature meets the preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop; after the air conditioner outdoor unit enters an anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger; and when the second water temperature meets the preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start. And the anti-freezing protection is determined to be executed or removed according to the temperature condition of the heat exchanger, so that the ground source heat pump unit can be prevented from being frozen during heating.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a heating and anti-freezing control method and device for a ground source heat pump unit.
Background
The ground source heat pump unit generally comprises a heat exchanger, a pipeline, a water pump and the like. Through the closed circulation system in the unit, the circulating water in the pipeline can flow through the heat exchanger when the water pump operates, so that the circulating water and the refrigerant circulating in the heat exchanger perform cold-heat exchange. In addition, the pipeline can be buried underground, so that circulating water in the pipeline can perform cold-heat exchange with soil, underground water and the like.
At present, when an air conditioner heats, the temperature of a refrigerant is increased after the refrigerant passes through a heat exchanger, and the temperature of circulating water is reduced after the circulating water passes through the heat exchanger.
However, when the temperature of the circulating water is too low, the ground source heat pump unit is easily damaged by freezing.
Disclosure of Invention
The invention provides a heating anti-freezing control method and device for a ground source heat pump unit, which can prevent the ground source heat pump unit from being frozen.
In order to achieve the purpose, the invention is realized by the following technical scheme:
on one hand, the invention provides a heating anti-freezing control method of a ground source heat pump unit, which is applied to an air conditioner outdoor unit and comprises the following steps:
receiving a heating instruction sent by an indoor unit of an air conditioner;
when the heating instruction is executed, controlling a compressor of the air conditioner outdoor unit to start heating;
after the compressor is controlled to start heating, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit;
when the first water temperature meets a preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop;
after the air conditioner outdoor unit enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger;
and when the second water temperature meets a preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start.
Further, when controlling the compressor to start heating, further comprising: triggering a first timer to start timing;
after controlling the compressor starts to heat with beginning, gather the first temperature that the heat exchanger corresponds among the ground source heat pump set, include: when the timing duration of the first timer reaches a first preset duration, periodically acquiring a first water outlet temperature and a first water inlet temperature of the heat exchanger at preset time intervals until the outdoor unit of the air conditioner enters an anti-freezing protection state;
when the first water temperature meets the preset anti-freezing protection condition, the method comprises the following steps: when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, wherein the first temperature threshold is not greater than the second temperature threshold.
Further, the first preset time is any value of 3-8 min;
the first temperature threshold value is any value in the range of-12 to 2 ℃;
the second temperature threshold value is any value in-8-6 ℃.
Further, the method further comprises:
setting a temperature return value, a recommended outlet water temperature value and a recommended inlet water temperature value, wherein the first temperature threshold value is not greater than the recommended outlet water temperature value, the second temperature threshold value is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value;
determining a first sum of the rewarming value and the first temperature threshold;
determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value;
determining a second sum of the rewarming value and the second temperature threshold;
determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
and the number of the first and second groups,
when the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further comprises the following steps: triggering a second timer to start timing;
and the number of the first and second groups,
after the outdoor unit of the air conditioner enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger, wherein the collecting comprises the following steps: when the timing duration of the second timer reaches a second preset duration, periodically acquiring a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals until the anti-freezing protection state is released;
when the second water temperature meets a preset anti-freezing release condition, the method comprises the following steps: and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold.
Further, the second preset time is any value in 3-8 min;
the temperature return value is any value in 3-5 ℃;
the recommended outlet water temperature value is any value of 1-6 ℃;
the recommended value of the water inlet temperature is any value of 1-10 ℃.
Further, after receiving a heating instruction sent by an indoor unit of an air conditioner, the method further includes: judging whether the outdoor unit of the air conditioner is in the anti-freezing protection state currently, if so, not executing the heating instruction;
when it is determined that the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further includes: triggering the air conditioner indoor unit to display a preset anti-freezing protection mark;
when the anti-freezing protection state is released, the method further comprises the following steps: and triggering the indoor unit of the air conditioner to not display the anti-freezing protection mark.
In another aspect, the present invention provides an outdoor unit of an air conditioner, comprising:
the system comprises a communication unit, a processing unit, an anti-freezing protection control unit and an anti-freezing release control unit;
the communication unit is used for receiving a heating instruction sent by an indoor unit of an air conditioner;
the processing unit is used for controlling the compressor of the air conditioner outdoor unit to start heating when the heating instruction is executed; triggering by the anti-freezing protection control unit to control the compressor to stop; triggering through the anti-freezing release control unit to control the compressor to start;
the anti-freezing protection control unit is used for collecting a first water temperature corresponding to a heat exchanger in the ground source heat pump unit after the processing unit controls the compressor to start to heat; when the first water temperature meets a preset anti-freezing protection condition, determining that the air conditioner outdoor unit enters an anti-freezing protection state, and triggering the processing unit; triggering by the anti-freezing release control unit to release the anti-freezing protection state;
the anti-freezing release control unit is used for collecting a second water temperature corresponding to the heat exchanger after the air conditioner outdoor unit enters the anti-freezing protection state; and when the second water temperature meets a preset anti-freezing release condition, triggering the anti-freezing protection control unit and triggering the processing unit.
Further, the outdoor unit of an air conditioner further includes: a first timer;
the processing unit is further used for triggering a first timer to start timing when the compressor is controlled to start to heat;
the anti-freezing protection control unit is used for periodically acquiring a first water outlet temperature and a first water inlet temperature of the heat exchanger at preset time intervals when the timing duration of the first timer reaches a first preset duration until the outdoor unit of the air conditioner enters an anti-freezing protection state; when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, the outdoor unit of the air conditioner is determined to enter an anti-freezing protection state, wherein the first temperature threshold is not greater than the second temperature threshold.
Further, the outdoor unit of an air conditioner further includes: a setting unit and a second timer;
the setting unit is used for setting a temperature return value, a recommended outlet water temperature value and a recommended inlet water temperature value, wherein the first temperature threshold value is not greater than the recommended outlet water temperature value, the second temperature threshold value is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value; determining a first sum of the rewarming value and the first temperature threshold; determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value; determining a second sum of the rewarming value and the second temperature threshold; determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
the processing unit is further used for triggering a second timer to start timing when the air conditioner outdoor unit enters the anti-freezing protection state;
the anti-freezing release control unit is used for periodically acquiring a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals when the timing duration of the second timer reaches a second preset duration until the anti-freezing protection state is released; and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold, the anti-freezing protection state is released.
Further, the processing unit is further configured to, after receiving the heating instruction, determine whether the outdoor unit of the air conditioner is currently in the anti-freeze protection state, and if so, not execute the heating instruction;
the anti-freezing protection control unit is also used for triggering the air conditioner indoor unit to display a preset anti-freezing protection mark when the air conditioner outdoor unit is determined to enter an anti-freezing protection state; and triggering the indoor unit of the air conditioner not to display the anti-freezing protection mark when the anti-freezing protection state is released.
The invention provides a heating anti-freezing control method and a device for a ground source heat pump unit, wherein the method comprises the following steps: the method comprises the steps that an air conditioner outdoor unit receives a heating instruction sent by an air conditioner indoor unit; when a heating instruction is executed, controlling a compressor of an air conditioner outdoor unit to start heating; after controlling a compressor to start to heat, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit; when the first water temperature meets the preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop; after the air conditioner outdoor unit enters an anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger; and when the second water temperature meets the preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start. And the anti-freezing protection is determined to be executed or removed according to the temperature condition of the heat exchanger, so that the ground source heat pump unit can be prevented from being frozen during heating.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a heating anti-freezing control method of a ground source heat pump unit according to an embodiment of the present invention;
fig. 2 is a flow chart of another heating anti-freezing control method of a ground source heat pump unit according to an embodiment of the present invention;
fig. 3 is a schematic view of an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic view of another outdoor unit of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a heating anti-freezing control method for a ground source heat pump unit, which is applied to an outdoor unit of an air conditioner, and includes the following steps:
step 101: and receiving a heating instruction sent by an indoor unit of the air conditioner.
Step 102: and when the heating instruction is executed, controlling a compressor of the air conditioner outdoor unit to start heating.
Step 103: and after controlling the compressor to start to heat, collecting a first water temperature corresponding to a heat exchanger in the ground source heat pump unit.
Step 104: and when the first water temperature meets a preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop.
Step 105: and after the air conditioner outdoor unit enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger.
Step 106: and when the second water temperature meets a preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start.
In the embodiment of the invention, an air conditioner outdoor unit receives a heating instruction sent by an air conditioner indoor unit; when a heating instruction is executed, controlling a compressor of an air conditioner outdoor unit to start heating; after controlling a compressor to start to heat, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit; when the first water temperature meets the preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop; after the air conditioner outdoor unit enters an anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger; and when the second water temperature meets the preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start. And the anti-freezing protection is determined to be executed or removed according to the temperature condition of the heat exchanger, so that the ground source heat pump unit can be prevented from being frozen during heating.
In detail, when an air conditioner user needs air conditioning heating, a heating request can be issued to an air conditioner indoor unit through an air conditioner remote controller, voice control and the like, and the air conditioner indoor unit can send a heating instruction to an air conditioner outdoor unit.
For example, if the ground source heat pump unit includes a plurality of indoor air conditioners and an outdoor air conditioner, when any indoor air conditioner sends a heating instruction, the outdoor air conditioner can receive the heating instruction and execute the heating instruction. The refrigerant of the air conditioner outdoor unit can enter the heat exchanger to exchange heat with circulating water in the heat exchanger. After the water pump is started, the circulating flow of circulating water in the heat exchanger and the pipeline can be realized. In detail, this pipe may be a U-shaped pipe extending deep into the ground. In detail, the circulating water may be tap water, or tap water to which an anti-freezing solution is added.
If the ground source heat pump unit comprises a plurality of air conditioner indoor units and a plurality of air conditioner outdoor units, one air conditioner outdoor unit can be used as an outdoor host machine, and other air conditioner outdoor units can be used as outdoor slave machines. The heating instruction sent by each air conditioner indoor unit can be sent to the outdoor host machine, and the outdoor host machine can execute the heating instruction or distribute the heating instruction to the outdoor slave machine for execution. In general, when there are a plurality of outdoor units, each outdoor unit is connected to a heat exchanger to exchange heat and cold between refrigerant and circulating water. However, the same water pump may be used for the respective outdoor units. When any air conditioner outdoor unit is started, the water pump is started.
In detail, 485 can be adopted as the communication mode between the indoor unit and the outdoor unit of the air conditioner, the identities of the indoor units and the outdoor units are determined by different addresses on 485 buses, and the addresses keep uniqueness, so that address conflict cannot be generated on a control system.
After receiving the heating instruction, the outdoor unit of the air conditioner can execute the heating instruction after analysis processing. Specifically, the outdoor unit of the air conditioner may control the four-way valve to adjust to a heating mode and control the compressor to start heating.
After heating is started, circulating water in the heat exchanger exchanges heat with a refrigerant, so that the water temperature is reduced, namely the water inlet temperature is higher than the water outlet temperature. Considering that the circulating water can freeze components such as a heat exchanger, a water pump and a pipeline in the ground source heat pump unit when the temperature of the circulating water is too low, the temperature of the water corresponding to the heat exchanger, namely the first water temperature, can be monitored after heating is started.
In detail, the temperature sensor arranged at the water outlet and the water inlet of the heat exchanger can be used for collecting the water temperature corresponding to the heat exchanger.
In general, the first water temperature may be a water temperature at a water inlet of the heat exchanger and a water temperature at a water outlet of the heat exchanger. Of course, based on different practical application requirements, only the inlet water temperature or only the outlet water temperature can be monitored.
When the first water temperature meets the anti-freezing protection condition, the water temperature can be considered to be no longer low, so that the compressor can be controlled to stop heating, and the outdoor unit of the air conditioner enters an anti-freezing protection state.
Because heating is stopped, namely the circulating water does not exchange heat with the refrigerant to reduce the temperature, but simultaneously the circulating water can still exchange heat with soil, underground water and the like to increase the temperature, the low-temperature circulating water can gradually return to the temperature after heating is stopped.
Of course, after the circulating water is heated to a certain degree, the air conditioner can be continuously supported for heating. Therefore, the water temperature corresponding to the heat exchanger, namely the second water temperature, can be monitored after the outdoor unit of the air conditioner enters the anti-freezing protection state. Similarly, the second water temperature can be the water temperature at the water inlet of the heat exchanger and the water temperature at the water outlet of the heat exchanger. Of course, based on different practical application requirements, only the inlet water temperature or only the outlet water temperature can be monitored.
When the second water temperature meets the anti-freezing release condition, the air conditioner outdoor unit can be considered to continue heating in a short time without freezing the ground source heat pump unit, so that the compressor can be controlled to start to continue heating, and the anti-freezing protection state of the air conditioner outdoor unit is released.
Certainly, after the compressor is controlled to start heating again, the acquisition operation of the first water temperature can be executed again, so that the compressor can be controlled to stop again before the circulating water temperature is as low as that of the ground source heat pump unit to be damaged, so as to realize anti-freezing protection, and the circulation is performed, so that the ground source heat pump unit is prevented from being damaged while heating of the air conditioner outdoor unit is ensured.
In one embodiment of the present invention, to illustrate a possible implementation of determining whether to perform anti-freeze protection according to the first water temperature, when controlling the compressor to start heating, the method further includes: triggering a first timer to start timing;
after controlling the compressor starts to heat with beginning, gather the first temperature that the heat exchanger corresponds among the ground source heat pump set, include: when the timing duration of the first timer reaches a first preset duration, periodically acquiring a first water outlet temperature and a first water inlet temperature of the heat exchanger at preset time intervals until the outdoor unit of the air conditioner enters an anti-freezing protection state;
when the first water temperature meets the preset anti-freezing protection condition, the method comprises the following steps: when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, wherein the first temperature threshold is not greater than the second temperature threshold.
As mentioned above, when the outdoor unit of the air conditioner heats, the refrigerant continuously exchanges heat with the circulating water to absorb heat of the circulating water, so as to lower the temperature of the circulating water. When the temperature of the circulating water is not raised in time, the temperature of the circulating water is continuously reduced through continuous heat exchange with the refrigerant. Further, when a plurality of air-conditioning outdoor units share the same source of circulating water, the more air-conditioning outdoor units in a heating state, the faster the temperature of the circulating water decreases. Therefore, it is preferable to periodically monitor the inlet water temperature and the outlet water temperature of the heat exchanger after the heating is started. For example, the water temperature may be monitored every 10s, 30s, or 1 min.
Considering that the water temperature is usually not obviously reduced in a period of time when heating is just started, and the ground source heat pump unit cannot be damaged by freezing, the water temperature can be periodically monitored after the heating is started for a period of time. For example, the water temperature may be monitored every 30 seconds after the heating is started for 5 min.
In the embodiment of the invention, as for any monitored water temperature, as long as the current outlet water temperature is not greater than the first temperature threshold value or the current inlet water temperature is not greater than the second temperature threshold value, the anti-freezing protection can be executed to control the compressor to stop, namely stop heating. After heating is stopped, the water temperature gradually rises.
For example, after the air conditioner outdoor unit collects the outlet water temperature and the inlet water temperature, it may be determined whether the outlet water temperature is not greater than a first temperature threshold, if so, the compressor may be controlled to stop, otherwise, it may be further determined whether the inlet water temperature is not greater than a second temperature threshold, if so, the compressor may be controlled to stop, otherwise, it may be determined that the compressor is not required to be protected from freezing, and the compressor may be kept operating normally.
In other embodiments of the present invention, after heating is started, only the inlet water temperature or the outlet water temperature is periodically collected, and as long as the collected water temperature is not greater than the corresponding temperature threshold, the refrigeration protection can be performed and the compressor can be controlled to stop heating.
In one embodiment of the invention, the first preset time period is any value in the range of 3-8 min; the first temperature threshold value is any value in the range of-12 to 2 ℃; the second temperature threshold value is any value in-8-6 ℃.
For example, the value of the first preset duration may be 3, 4, 5, 6, 7, or 8; the value of the first temperature threshold can be-12, -10, -8, -6, -4, -2, 0 or 2; the value of the second temperature threshold may be-8, -6, -4, -2, 0, 2, 4, or 6.
In detail, the temperature threshold, the preset time and the like can be set as required according to the actual application scenario of the ground source heat pump unit. For example, when the circulating water is tap water, the first temperature threshold and the second temperature threshold are usually values greater than 0 ℃, and when the circulating water is tap water added with antifreeze oil, the first temperature threshold and the second temperature threshold may be values greater than the freezing point of the tap water. In addition, the specification of the heat exchanger, the buried depth of the pipeline and the like can also influence the specific values, but the ground source heat pump unit is not frozen when the anti-freezing protection is started.
In one embodiment of the present invention, to illustrate one possible implementation of determining whether to protect against freezing based on the second water temperature, the method may further comprise:
setting a temperature return value, a recommended outlet water temperature value and a recommended inlet water temperature value, wherein the first temperature threshold value is not greater than the recommended outlet water temperature value, the second temperature threshold value is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value;
determining a first sum of the rewarming value and the first temperature threshold;
determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value;
determining a second sum of the rewarming value and the second temperature threshold;
determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
and the number of the first and second groups,
when the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further comprises the following steps: triggering a second timer to start timing;
and the number of the first and second groups,
after the outdoor unit of the air conditioner enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger, wherein the collecting comprises the following steps: when the timing duration of the second timer reaches a second preset duration, periodically acquiring a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals until the anti-freezing protection state is released;
when the second water temperature meets a preset anti-freezing release condition, the method comprises the following steps: and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold.
In detail, a user sends a heating stop request without heating of the air conditioner, and if the air conditioner is in a shutdown command, the outdoor unit of the air conditioner controls the compressor to stop, and heating is not needed after the compressor is stopped. During the refrigeration protection control, the compressor is also controlled to stop, the refrigeration protection state is entered, and after the refrigeration protection is released, the circulating water gradually returns to the temperature, and then the heating can be recovered. Therefore, after the air conditioner outdoor unit controls the compressor to stop heating and enters a refrigeration protection state, heating can be recovered according to the temperature return condition.
On the basis, in order to guarantee timeliness of continuous heating so as to guarantee user experience, the water inlet temperature and the water outlet temperature of the heat exchanger can be periodically monitored after the heat exchanger enters a refrigeration protection state. For example, the water temperature may be monitored every 10s, 30s, or 1 min.
Considering that the temperature of the water is not obviously raised within a period of time just entering the refrigeration protection state and is not suitable for continuously supporting the heating of the outdoor unit of the air conditioner, the temperature of the water can be periodically monitored after entering the refrigeration protection state for a period of time. For example, the water temperature may be monitored every 30 seconds after entering the refrigeration protection state for 5 min.
In the embodiment of the invention, for any monitored water temperature, the anti-freezing protection can be released only if the current outlet water temperature is not less than the third temperature threshold and the current inlet water temperature is not less than the fourth temperature threshold, so as to control the compressor to start, thereby continuing heating. Of course, the water temperature generally decreases gradually after heating is continued. After heating is continued for a period of time, the water temperature can be continuously and periodically detected to determine whether anti-freezing protection needs to be executed again in real time, and the process is circulated.
For example, after the outdoor unit of the air conditioner collects the outlet water temperature and the inlet water temperature, it may be determined whether the outlet water temperature is not less than a third temperature threshold, if not, it may be determined that the anti-freeze protection is not releasable and the compressor remains stopped, otherwise, it may be further determined whether the inlet water temperature is not greater than a fourth temperature threshold, if not, it may be determined that the anti-freeze protection is not releasable and the compressor remains stopped, otherwise, it may be determined that the anti-freeze protection is released and the compressor is controlled to start to continue heating.
In other embodiments of the present invention, after the anti-freeze protection is started, only the inlet water temperature or the outlet water temperature is periodically collected, and as long as the collected water temperature is not less than the corresponding temperature threshold, the refrigeration protection can be released and the compressor can be controlled to start to recover heating.
In the embodiment of the invention, a temperature return value and a temperature recommendation value are set, and a third temperature threshold value and a fourth temperature threshold value are determined based on the temperature return value and the temperature recommendation value and the first temperature threshold value and the second temperature threshold value. Thus, the heating can be recovered as early as possible while the anti-freezing protection is ensured.
In one embodiment of the invention, the second preset time period is any value in the range of 3-8 min; the temperature return value is any value in 3-5 ℃; the recommended outlet water temperature value is any value of 1-6 ℃; the recommended value of the water inlet temperature is any value of 1-10 ℃.
For example, the value of the second preset duration may be 3, 4, 5, 6, 7, or 8; the value of the temperature return value can be 3, 4 or 5; the value of the recommended outlet water temperature value can be 1, 2, 3, 4, 5 or 6; can be 1, 2, 3, 5, 7, 8 or 10.
In an embodiment of the present invention, the preset time length, the temperature threshold, the temperature-returning value, the temperature-recommended value, and the like may be changed as needed through a remote control test code, and the changed values may be memorized in an internal nonvolatile memory. When the air conditioner outdoor unit works, heating processing is executed according to the numerical value memorized in the nonvolatile memory.
In an embodiment of the present invention, after receiving a heating instruction sent by an indoor unit of an air conditioner, the method further includes: judging whether the outdoor unit of the air conditioner is in the anti-freezing protection state currently, if so, not executing the heating instruction;
when it is determined that the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further includes: triggering the air conditioner indoor unit to display a preset anti-freezing protection mark;
when the anti-freezing protection state is released, the method further comprises the following steps: and triggering the indoor unit of the air conditioner to not display the anti-freezing protection mark.
In detail, after entering the anti-freezing protection state, the compressor is stopped, and heating is stopped, so that the user can timely know that the reason for stopping heating is anti-freezing protection instead of outdoor unit fault and the like by displaying an anti-freezing protection mark on a display panel of an indoor unit of the air conditioner. Of course, when the anti-freezing protection is released, the anti-freezing protection mark is correspondingly not displayed.
If the user does not notice the anti-freezing protection mark and sends out the heating request again during the heating suspension period, the outdoor unit of the air conditioner receives the heating instruction sent by the indoor unit of the air conditioner again. Because heating cannot be performed during the anti-freezing protection period, when a heating instruction is received, whether the current anti-freezing protection is performed or not can be judged, and the heating instruction can be executed to start heating only during the non-anti-freezing protection period.
In other embodiments of the present invention, the indoor unit of the air conditioner may also process the heating request issued by the user in advance according to whether the anti-freeze protection identifier is displayed or not, if the anti-freeze protection identifier is currently displayed, the heating request may not be processed, that is, the heating instruction may not be issued, and of course, the user may also be reminded not to heat during the anti-freeze protection period in a reminding manner.
As shown in fig. 2, another heating and anti-freezing control method for a ground source heat pump unit according to an embodiment of the present invention may include the following steps:
step 201: the air conditioner outdoor unit sets a first temperature threshold value of-10 ℃, a second temperature threshold value of-6 ℃, a time interval of 30s, a timing duration of 5min, a return temperature value of 4 ℃, a recommended outlet water temperature value of 4 ℃ and a recommended inlet water temperature value of 8 ℃.
Step 202: the outdoor unit of the air conditioner sets a third temperature threshold value of-6 ℃ and a fourth temperature threshold value of-2 ℃.
Wherein, the temperature of-6 ℃ { (-10 ℃ +4 ℃) is 4 }, the first 4 ℃ is the temperature return value, and the second 4 ℃ is the recommended value of the water outlet temperature.
Wherein, the temperature is-2 ℃ and min { (-6 ℃ and 4 ℃), 8 ℃ and the temperature is 4 ℃ and is the return temperature value.
Step 203: the air conditioner indoor unit receives a heating request input by an external remote controller, and issues a heating instruction to the air conditioner outdoor unit according to the heating request.
Step 204: and the air conditioner outdoor unit receives a heating instruction sent by the air conditioner indoor unit, judges whether the air conditioner outdoor unit is in an anti-freezing protection state currently, if so, does not execute the heating instruction and ends the current process, and otherwise, executes the step 205.
Step 205: the air conditioner outdoor unit executes a heating instruction, controls a compressor of the air conditioner outdoor unit to start heating, and triggers a first timer to start timing.
Step 206: and when the timing duration of the first timer reaches 5min, the outdoor unit of the air conditioner collects the first water outlet temperature and the first water inlet temperature of the heat exchanger every 30 s.
Step 207: the outdoor unit of the air conditioner determines whether the first outlet water temperature is not greater than-10 ℃, if so, step 209 is executed, otherwise, step 208 is executed.
Step 208: the outdoor unit of the air conditioner determines whether the first inlet water temperature is not greater than-6 ℃, if so, step 209 is executed, otherwise, step 206 is executed.
Step 209: and the air conditioner outdoor unit determines that the air conditioner outdoor unit enters an anti-freezing protection state, controls the compressor to stop, triggers the second timer to start timing, triggers the air conditioner indoor unit to display an anti-freezing protection mark, and triggers the step 206 to end.
When step 209 is executed, step 206 is not executed again, that is, the outlet water temperature and the inlet water temperature of the heat exchanger are not periodically collected.
Step 210: and when the timing duration of the second timer reaches 5min, the second water outlet temperature and the second water inlet temperature of the heat exchanger are collected every 30s until the air conditioner outdoor unit enters an anti-freezing protection state.
Step 211: the outdoor unit of the air conditioner determines whether the second outlet water temperature is not less than-6 ℃, if so, step 212 is executed, otherwise, step 210 is executed.
Step 212: the outdoor unit of the air conditioner determines whether the second inlet water temperature is not less than-2 ℃, if so, step 213 is executed, otherwise, step 210 is executed.
Step 213: and the air conditioner outdoor unit releases the anti-freezing protection state, controls the compressor to start, triggers the air conditioner indoor unit not to display the anti-freezing protection mark, executes the step 205, and triggers the step 210 to end.
When step 213 is executed, step 210 is not executed again, that is, the outlet water temperature and the inlet water temperature of the heat exchanger are not periodically collected again.
In summary, the heating and anti-freezing control method for the ground source heat pump provided by the embodiment of the invention can control whether the compressor is started or stopped according to the outlet water temperature and the inlet water temperature of the heat exchanger in the heating operation state, so that the problem that the unit is frozen due to too low water temperature can be solved.
As shown in fig. 3, an embodiment of the present invention provides an outdoor unit of an air conditioner, which may include: a communication unit 301, a processing unit 302, an anti-freeze protection control unit 303, and an anti-freeze release control unit 304;
the communication unit 301 is configured to receive a heating instruction sent by an indoor unit of an air conditioner;
the processing unit 302 is configured to control a compressor of the air conditioner outdoor unit to start heating when the heating instruction is executed; triggered by the anti-freeze protection control unit 303 to control the compressor to stop; triggered by the antifreeze release control unit 304 to control the compressor start-up;
the anti-freezing protection control unit 303 is configured to collect a first water temperature corresponding to a heat exchanger in the ground source heat pump unit after the processing unit 302 controls the compressor to start heating; when the first water temperature meets a preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and triggering the processing unit 302; triggered by the antifreeze release control unit 304 to release the antifreeze protection state;
the anti-freezing release control unit 304 is configured to collect a second water temperature corresponding to the heat exchanger after the outdoor unit of the air conditioner enters the anti-freezing protection state; and when the second water temperature meets a preset anti-freezing release condition, triggering the anti-freezing protection control unit 303 and triggering the processing unit 302.
In an embodiment of the present invention, referring to fig. 4, the outdoor unit of an air conditioner further includes: a first timer 401;
the processing unit 302 is further configured to trigger a first timer 401 to start timing when the compressor is controlled to start heating;
the anti-freezing protection control unit 303 is configured to periodically acquire a first outlet water temperature and a first inlet water temperature of the heat exchanger at preset time intervals when the timing duration of the first timer 401 reaches a first preset duration until the outdoor unit of the air conditioner enters an anti-freezing protection state; when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, the outdoor unit of the air conditioner is determined to enter an anti-freezing protection state, wherein the first temperature threshold is not greater than the second temperature threshold.
In an embodiment of the present invention, referring to fig. 4, the outdoor unit of an air conditioner further includes: a setting unit 402 and a second timer 403;
the setting unit 402 is configured to set a temperature return value, a recommended outlet water temperature value, and a recommended inlet water temperature value, where the first temperature threshold is not greater than the recommended outlet water temperature value, the second temperature threshold is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value; determining a first sum of the rewarming value and the first temperature threshold; determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value; determining a second sum of the rewarming value and the second temperature threshold; determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
the processing unit 302 is further configured to trigger a second timer 403 to start timing when the outdoor unit of the air conditioner enters the anti-freeze protection state;
the anti-freeze release control unit 304 is configured to periodically acquire a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals when the timing duration of the second timer 403 reaches a second preset duration until the anti-freeze protection state is released; and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold, the anti-freezing protection state is released.
In an embodiment of the present invention, the processing unit 302 is further configured to determine whether the outdoor unit of the air conditioner is currently in the anti-freeze protection state after receiving the heating instruction, and if so, not execute the heating instruction;
the anti-freezing protection control unit 303 is further configured to trigger the air conditioner indoor unit to display a preset anti-freezing protection identifier when it is determined that the air conditioner outdoor unit enters the anti-freezing protection state; and triggering the indoor unit of the air conditioner not to display the anti-freezing protection mark when the anti-freezing protection state is released.
Because the information interaction, execution process, and other contents between the units in the device are based on the same concept as the method embodiment of the present invention, specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.
In addition, the embodiment of the invention also provides a heating anti-freezing control system of a ground source heat pump unit, or called as the ground source heat pump unit, which comprises the following components: at least one above-mentioned any indoor set of air conditioner, at least one above-mentioned any outdoor set of air conditioner, heat exchanger, pipeline and the water pump that every outdoor set of air conditioner is connected.
In detail, when the water pump is started, circulating water can flow in front of the heat exchanger and the pipeline in a circulating mode, and the circulating water can be tap water or tap water added with anti-freezing liquid. The heat exchanger can realize the heat exchange between the refrigerant and the circulating water. The system can realize the anti-freezing protection of the ground source heat pump unit and avoid freezing components such as a heat exchanger, a pipeline, a water pump and the like in the unit when the temperature of circulating water is too low.
In addition, the embodiment of the invention also provides a computer readable medium for storing instructions for causing a computer to execute the heating and anti-freezing control method of the ground source heat pump unit as described herein. Specifically, a system or an apparatus equipped with a storage medium on which software program codes that realize the functions of any of the above-described embodiments are stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program codes stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer via a communications network.
Further, it should be clear that the functions of any one of the above-described embodiments may be implemented not only by executing the program code read out by the computer, but also by causing an operating system or the like operating on the computer to perform a part or all of the actual operations based on instructions of the program code.
Further, it is to be understood that the program code read out from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causes a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on instructions of the program code, thereby realizing the functions of any of the above-described embodiments.
In summary, the embodiments of the present invention have at least the following advantages:
1. in the embodiment of the invention, an air conditioner outdoor unit receives a heating instruction sent by an air conditioner indoor unit; when a heating instruction is executed, controlling a compressor of an air conditioner outdoor unit to start heating; after controlling a compressor to start to heat, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit; when the first water temperature meets the preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop; after the air conditioner outdoor unit enters an anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger; and when the second water temperature meets the preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start. And the anti-freezing protection is determined to be executed or removed according to the temperature condition of the heat exchanger, so that the ground source heat pump unit can be prevented from being frozen during heating.
2. The heating and anti-freezing control method of the ground source heat pump provided by the embodiment of the invention can control whether the compressor is started or stopped according to the outlet water temperature and the inlet water temperature of the heat exchanger in the heating running state, thereby solving the problem that the unit is frozen due to too low water temperature.
It should be noted that not all steps and modules in the above flows and system structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The system structure described in the above embodiments may be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by a plurality of physical entities, or some components in a plurality of independent devices may be implemented together.
In the above embodiments, the hardware unit may be implemented mechanically or electrically. For example, a hardware element may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware elements may also comprise programmable logic or circuitry, such as a general purpose processor or other programmable processor, that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
While the invention has been shown and described in detail in the drawings and in the preferred embodiments, it is not intended to limit the invention to the embodiments disclosed, and it will be apparent to those skilled in the art that various combinations of the code auditing means in the various embodiments described above may be used to obtain further embodiments of the invention, which are also within the scope of the invention.
Claims (10)
1. The heating and anti-freezing control method of the ground source heat pump unit is characterized by being applied to an air conditioner outdoor unit and comprising the following steps:
receiving a heating instruction sent by an indoor unit of an air conditioner;
when the heating instruction is executed, controlling a compressor of the air conditioner outdoor unit to start heating;
after the compressor is controlled to start heating, collecting a first water temperature corresponding to a heat exchanger in a ground source heat pump unit;
when the first water temperature meets a preset anti-freezing protection condition, determining that the outdoor unit of the air conditioner enters an anti-freezing protection state, and controlling the compressor to stop;
after the air conditioner outdoor unit enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger;
and when the second water temperature meets a preset anti-freezing release condition, releasing the anti-freezing protection state and controlling the compressor to start.
2. The method of claim 1,
when controlling the compressor to start heating, further comprising: triggering a first timer to start timing;
after controlling the compressor starts to heat with beginning, gather the first temperature that the heat exchanger corresponds among the ground source heat pump set, include: when the timing duration of the first timer reaches a first preset duration, periodically acquiring a first water outlet temperature and a first water inlet temperature of the heat exchanger at preset time intervals until the outdoor unit of the air conditioner enters an anti-freezing protection state;
when the first water temperature meets the preset anti-freezing protection condition, the method comprises the following steps: when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, wherein the first temperature threshold is not greater than the second temperature threshold.
3. The method of claim 2,
the first preset time is any value in 3-8 min;
the first temperature threshold value is any value in the range of-12 to 2 ℃;
the second temperature threshold value is any value in-8-6 ℃.
4. The method of claim 2,
further comprising:
setting a temperature return value, a recommended outlet water temperature value and a recommended inlet water temperature value, wherein the first temperature threshold value is not greater than the recommended outlet water temperature value, the second temperature threshold value is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value;
determining a first sum of the rewarming value and the first temperature threshold;
determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value;
determining a second sum of the rewarming value and the second temperature threshold;
determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
and the number of the first and second groups,
when the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further comprises the following steps: triggering a second timer to start timing;
and the number of the first and second groups,
after the outdoor unit of the air conditioner enters the anti-freezing protection state, collecting a second water temperature corresponding to the heat exchanger, wherein the collecting comprises the following steps: when the timing duration of the second timer reaches a second preset duration, periodically acquiring a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals until the anti-freezing protection state is released;
when the second water temperature meets a preset anti-freezing release condition, the method comprises the following steps: and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold.
5. The method of claim 4,
the second preset time is any value in 3-8 min;
the temperature return value is any value in 3-5 ℃;
the recommended outlet water temperature value is any value of 1-6 ℃;
the recommended value of the water inlet temperature is any value of 1-10 ℃.
6. The method according to any one of claims 1 to 5,
after the receiving of the heating instruction sent by the indoor unit of the air conditioner, the method further comprises: judging whether the outdoor unit of the air conditioner is in the anti-freezing protection state currently, if so, not executing the heating instruction;
when it is determined that the outdoor unit of the air conditioner enters the anti-freezing protection state, the method further includes: triggering the air conditioner indoor unit to display a preset anti-freezing protection mark;
when the anti-freezing protection state is released, the method further comprises the following steps: and triggering the indoor unit of the air conditioner to not display the anti-freezing protection mark.
7. An outdoor unit of an air conditioner, comprising:
the system comprises a communication unit, a processing unit, an anti-freezing protection control unit and an anti-freezing release control unit;
the communication unit is used for receiving a heating instruction sent by an indoor unit of an air conditioner;
the processing unit is used for controlling the compressor of the air conditioner outdoor unit to start heating when the heating instruction is executed; triggering by the anti-freezing protection control unit to control the compressor to stop; triggering through the anti-freezing release control unit to control the compressor to start;
the anti-freezing protection control unit is used for collecting a first water temperature corresponding to a heat exchanger in the ground source heat pump unit after the processing unit controls the compressor to start to heat; when the first water temperature meets a preset anti-freezing protection condition, determining that the air conditioner outdoor unit enters an anti-freezing protection state, and triggering the processing unit; triggering by the anti-freezing release control unit to release the anti-freezing protection state;
the anti-freezing release control unit is used for collecting a second water temperature corresponding to the heat exchanger after the air conditioner outdoor unit enters the anti-freezing protection state; and when the second water temperature meets a preset anti-freezing release condition, triggering the anti-freezing protection control unit and triggering the processing unit.
8. The outdoor unit of claim 7, wherein,
further comprising: a first timer;
the processing unit is further used for triggering a first timer to start timing when the compressor is controlled to start to heat;
the anti-freezing protection control unit is used for periodically acquiring a first water outlet temperature and a first water inlet temperature of the heat exchanger at preset time intervals when the timing duration of the first timer reaches a first preset duration until the outdoor unit of the air conditioner enters an anti-freezing protection state; when any one of the first outlet water temperature is not greater than a preset first temperature threshold and the first inlet water temperature is not greater than a preset second temperature threshold is established, the outdoor unit of the air conditioner is determined to enter an anti-freezing protection state, wherein the first temperature threshold is not greater than the second temperature threshold.
9. The outdoor unit of an air conditioner according to claim 8,
further comprising: a setting unit and a second timer;
the setting unit is used for setting a temperature return value, a recommended outlet water temperature value and a recommended inlet water temperature value, wherein the first temperature threshold value is not greater than the recommended outlet water temperature value, the second temperature threshold value is not greater than the recommended inlet water temperature value, and the recommended outlet water temperature value is not greater than the recommended inlet water temperature value; determining a first sum of the rewarming value and the first temperature threshold; determining the minimum value of the first sum and the recommended outlet water temperature value as a third temperature threshold value; determining a second sum of the rewarming value and the second temperature threshold; determining the minimum value of the second sum and the recommended inlet water temperature value as a fourth temperature threshold value;
the processing unit is further used for triggering a second timer to start timing when the air conditioner outdoor unit enters the anti-freezing protection state;
the anti-freezing release control unit is used for periodically acquiring a second outlet water temperature and a second inlet water temperature of the heat exchanger at preset time intervals when the timing duration of the second timer reaches a second preset duration until the anti-freezing protection state is released; and when the second outlet water temperature is not less than the third temperature threshold and the second inlet water temperature is not less than the fourth temperature threshold, the anti-freezing protection state is released.
10. The outdoor unit of an air conditioner according to any one of claims 7 to 9,
the processing unit is further configured to determine whether the outdoor unit of the air conditioner is currently in the anti-freezing protection state after receiving the heating instruction, and if so, not execute the heating instruction;
the anti-freezing protection control unit is also used for triggering the air conditioner indoor unit to display a preset anti-freezing protection mark when the air conditioner outdoor unit is determined to enter an anti-freezing protection state; and triggering the indoor unit of the air conditioner not to display the anti-freezing protection mark when the anti-freezing protection state is released.
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| CN201911340679.8A CN111006375A (en) | 2019-12-23 | 2019-12-23 | Heating anti-freezing control method and device for ground source heat pump unit |
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| CN201911340679.8A CN111006375A (en) | 2019-12-23 | 2019-12-23 | Heating anti-freezing control method and device for ground source heat pump unit |
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Application publication date: 20200414 |