CN114543263A - Coil temperature control method, coil temperature control device and storage medium - Google Patents
Coil temperature control method, coil temperature control device and storage medium Download PDFInfo
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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
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The disclosure relates to a coil temperature control method, a coil temperature control device and a storage medium. The coil temperature control method comprises the following steps: monitoring the current coil temperature of the air-conditioning heat exchanger, and determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the air-conditioning heat exchanger does not frost; if the current coil temperature is monitored to be less than or equal to the critical coil temperature, adjusting the current coil temperature until the current coil temperature is greater than or equal to the critical coil temperature. The probability of air conditioner frosting can be reduced through the present disclosure.
Description
Technical Field
The disclosure relates to the technical field of smart homes, in particular to a coil temperature control method, a coil temperature control device and a storage medium.
Background
With the improvement of living standard of people, the air conditioner becomes an indispensable electrical appliance in the life of people.
In the related art, when an air conditioner operates, refrigerant in an air conditioner heat exchanger (an indoor side heat exchanger during refrigeration and an outdoor side heat exchanger during heating) evaporates and absorbs heat, and the temperature of a coil of the heat exchanger is lower than the ambient temperature. When the relative humidity in the environment is high and the coil temperature is below the dew point temperature, moisture in the air can frost on the fins of the heat exchanger. Under this condition, the heat transfer area of heat exchanger reduces, and receives frosting the influence, and the amount of wind of heat exchanger reduces, causes the heat exchange efficiency decline of heat exchanger, influences the actual use effect of air conditioner.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a coil temperature control method, a coil temperature control apparatus, and a storage medium.
According to a first aspect of the embodiments of the present disclosure, there is provided a coil pipe temperature control method, including:
monitoring the current coil temperature of an air-conditioning heat exchanger, and determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the air-conditioning heat exchanger does not frost; if the current coil temperature is monitored to be lower than the critical coil temperature, the current coil temperature is adjusted until the current coil temperature is higher than or equal to the critical coil temperature.
In one embodiment, the determining the critical coil temperature of the air conditioner heat exchanger includes: determining the dew point temperature and the absolute moisture content of the air of the current environment of the air-conditioning heat exchanger; performing temperature compensation on the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air; and determining the critical coil temperature of the air-conditioning heat exchanger based on the compensated dew point temperature.
In one embodiment, the temperature compensation of the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air comprises: determining a difference between the dew point temperature and the preset compensation temperature, and determining a ratio between the absolute moisture content of the air and a preset absolute moisture content of the air; and obtaining the compensated dew point temperature through the sum of the difference and the ratio.
In one embodiment, the adjusting the current coil temperature of the air conditioner based on the critical coil temperature includes: determining a target temperature difference between the critical coil temperature and a current coil temperature of the air conditioner; determining a target compressor frequency change value matched with the target temperature difference value based on the corresponding relation between the temperature difference value and the compressor frequency change value of the air conditioner; and adjusting the frequency of the compressor of the air conditioner according to the target compressor frequency change value so as to adjust the current coil temperature.
In one embodiment, before monitoring the current coil temperature of the air conditioning heat exchanger, the method further comprises: determining that an execution condition for monitoring the current coil temperature is met, wherein the execution condition for monitoring the current coil temperature is one or a combination of the following conditions: the temperature difference between the indoor environment temperature and the set temperature is smaller than a first temperature threshold; the running time of the air conditioner compressor reaches a specified time; the ambient temperature of the current environment of the heat exchanger is smaller than or equal to a second temperature threshold, and the current coil temperature of the air conditioner is smaller than or equal to a third temperature threshold.
According to a second aspect of the embodiments of the present disclosure, there is provided a coil temperature control device including:
the monitoring unit is used for monitoring the current coil temperature of the air-conditioning heat exchanger; the determining unit is used for determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the air-conditioning heat exchanger does not frost currently; and the processing unit is used for adjusting the current coil temperature under the condition that the current coil temperature is monitored to be less than the critical coil temperature until the current coil temperature is greater than or equal to the critical coil temperature.
In one embodiment, the determining unit determines the critical coil temperature of the air conditioner heat exchanger by: determining the dew point temperature and the absolute moisture content of the air of the current environment of the air-conditioning heat exchanger; performing temperature compensation on the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air; and determining the critical coil temperature of the air-conditioning heat exchanger based on the compensated dew point temperature.
In one embodiment, the determining unit performs temperature compensation on the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air as follows: determining a difference between the dew point temperature and the preset compensation temperature, and determining a ratio between the absolute moisture content of the air and a preset absolute moisture content of the air; and obtaining the compensated dew point temperature through the sum of the difference and the ratio.
In one embodiment, the processing unit adjusts the current coil temperature of the air conditioner based on the critical coil temperature by: determining a target temperature difference between the critical coil temperature and a current coil temperature of the air conditioner; determining a target compressor frequency change value matched with the target temperature difference value based on the corresponding relation between the temperature difference value and the compressor frequency change value of the air conditioner; and adjusting the frequency of the compressor of the air conditioner according to the target compressor frequency change value so as to adjust the current coil temperature.
In one embodiment, the determining unit is further configured to: before monitoring the current coil temperature of the air-conditioning heat exchanger, determining that an execution condition for monitoring the current coil temperature is met, wherein the execution condition for monitoring the current coil temperature is one or a combination of the following conditions: the temperature difference between the indoor environment temperature and the set temperature is smaller than a first temperature threshold; the running time of the air conditioner compressor reaches a specified time; the ambient temperature of the current environment of the heat exchanger is smaller than or equal to a second temperature threshold, and the current coil temperature of the air conditioner is smaller than or equal to a third temperature threshold.
According to a third aspect of the embodiments of the present disclosure, there is provided a coil temperature control device, including:
a processor; a memory for storing processor-executable instructions;
wherein the processor is configured to: the method of controlling the temperature of the coil as set forth in the first aspect or any one of the embodiments of the first aspect is performed.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a storage medium, where instructions are stored, and when executed by a processor, the instructions enable the processor to execute the method for controlling the temperature of a coil pipe according to the first aspect or any one of the embodiments of the first aspect.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: monitoring the current coil temperature of the air-conditioning heat exchanger, and determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the current air-conditioning heat exchanger does not frost. Further, the current coil temperature may be adjusted until the current coil temperature is greater than or equal to the critical coil temperature, under the condition that the current coil temperature is monitored to be less than or equal to the critical coil temperature. Therefore, in the process of refrigerating or heating through the air conditioner, the temperature of the coil of the air conditioner heat exchanger can be ensured to be larger than or equal to the critical temperature of the coil, so that the possibility of frosting of the air conditioner heat exchanger is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a flow chart illustrating a method of coil temperature control according to an exemplary embodiment.
Fig. 2 is a flow chart illustrating a method of determining a critical coil temperature of an air conditioning heat exchanger according to an exemplary embodiment.
Fig. 3 is a flow chart illustrating another method of determining a critical coil temperature of an air conditioning heat exchanger, according to an exemplary embodiment.
Fig. 4 is a flow chart illustrating a method for adjusting a current coil temperature of an air conditioner based on a critical coil temperature, according to an exemplary embodiment.
Fig. 5 is a diagram illustrating a correspondence table between a temperature difference value and a frequency variation value of an air conditioner compressor according to an exemplary embodiment.
FIG. 6 is a flow chart illustrating another method of coil temperature control according to an exemplary embodiment.
FIG. 7 is a flow chart illustrating coil temperature control for an air conditioning heating scenario, according to an exemplary embodiment.
FIG. 8 is a block diagram illustrating a coil temperature control apparatus according to an exemplary embodiment.
FIG. 9 is a block diagram illustrating an apparatus for coil temperature control according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure.
In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only a subset of the embodiments of the present disclosure, and not all embodiments. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present disclosure, and should not be construed as limiting the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The coil temperature control method provided by the embodiment of the disclosure can be applied to a working scene of refrigerating or heating of an air conditioner.
With the improvement of living standard of people, the air conditioner becomes an indispensable electrical appliance in the life of people.
In the related art, when an air conditioner operates, refrigerant in an air conditioner heat exchanger (an indoor side heat exchanger during refrigeration and an outdoor side heat exchanger during heating) evaporates and absorbs heat, and the temperature of a coil of the heat exchanger is lower than the ambient temperature. When the relative humidity in the environment is high and the coil temperature is below the dew point temperature, moisture in the air can frost on the fins of the heat exchanger. Under this condition, the heat transfer area of heat exchanger reduces, and receives frosting the influence, and the amount of wind of heat exchanger reduces, causes the heat exchange efficiency decline of heat exchanger, influences the actual use effect of air conditioner.
In the related art, the degree of frosting of the air conditioner can be judged by the ambient temperature and/or the ambient humidity. Furthermore, under the condition that the frosting degree of the air-conditioning heat exchanger meets the preset condition, the frosted air-conditioning heat exchanger can be heated and defrosted in a reverse heat exchange mode, so that the influence of the frosting of the air-conditioning heat exchanger on the heat exchange efficiency is improved. However, in the related art, the defrosting method for the air conditioner heat exchanger by the reverse heat exchange method affects the actual cooling or heating performance of the air conditioner. For example, if a user turns on a cooling mode of the air conditioner and the air conditioner currently performs a defrosting operation, the air conditioner cannot continuously supply cold air to the room during a defrosting operation in a reverse heat exchange manner, so that the ambient temperature in the room fluctuates. In addition, because the method needs to execute the defrosting operation under the condition that the air-conditioning heat exchanger is frosted to a certain degree, the problem of frosting operation exists in the actual working process of the air-conditioning heat exchanger. In this case, the heat exchange efficiency of the air conditioner heat exchanger decreases, and the air conditioner cannot perform cooling or heating with a superior effect. In addition, since the actual defrosting operation is to convert solid frost into liquid water, there may be a water leakage risk. In summary, in the related art, the treatment method for the frosting phenomenon of the air conditioner heat exchanger cannot meet the actual use requirement of the user.
In view of the above, the present disclosure provides a coil temperature control method, which can adjust a current coil temperature by monitoring the current coil temperature of an air conditioner heat exchanger and by using a critical coil temperature. The critical coil temperature is the minimum coil temperature which ensures that the coil of the current air-conditioning heat exchanger does not frost. Therefore, the current coil temperature is adjusted by the critical coil temperature, so that the frosting possibility of the air-conditioning heat exchanger can be effectively reduced in a mode that the current coil temperature is greater than or equal to the critical coil temperature. Based on this, the air conditioner can realize not having the interrupted execution refrigeration or heating, and the problem of air conditioner heat exchanger hanging frost work can be improved, and work efficiency can be promoted. In addition, because the method reduces the possibility of air conditioner frosting by adjusting the temperature of the coil, compared with the method for defrosting the air conditioner heat exchanger in the related art, the method can reduce the deployment cost of the drainage pipeline.
Fig. 1 is a flow chart illustrating a coil temperature control method according to an exemplary embodiment, where the coil temperature control method is used in a terminal, as shown in fig. 1, and includes the following steps.
In step S11, the current coil temperature of the air conditioning heat exchanger is monitored, and the critical coil temperature of the air conditioning heat exchanger is determined.
In the embodiment of the present disclosure, the critical coil temperature may be understood as a minimum coil temperature that ensures that the coil of the current air-conditioning heat exchanger does not frost. For example, if the current coil temperature of the air conditioner heat exchanger is less than the critical coil temperature, the air conditioner heat exchanger may have a problem of frosting.
In step S12a, if the current coil temperature is monitored to be less than the critical coil temperature, the current coil temperature is adjusted until the current coil temperature is greater than or equal to the critical coil temperature.
In step S12b, if the current coil temperature is detected to be greater than the critical coil temperature, the current coil temperature is maintained.
According to the coil temperature control method provided by the embodiment of the disclosure, the current coil temperature of the air conditioner heat exchanger can be adjusted by taking the critical coil temperature as a reference value, so that the frosting possibility of the air conditioner heat exchanger is reduced, and the working efficiency of air conditioner refrigeration or heating is ensured.
For example, the critical coil temperature of the air-conditioning heat exchanger can be determined by determining the dew point temperature and the absolute moisture content of the air of the Huajin where the air-conditioning heat exchanger is currently located.
Fig. 2 is a flowchart illustrating a method of determining a critical coil temperature of an air conditioner heat exchanger according to an exemplary embodiment, as shown in fig. 2, including the following steps S21 to S23.
In step S21, the dew point temperature and the absolute moisture content of the air of the environment in which the air conditioning heat exchanger is currently located are determined.
In the embodiment of the disclosure, the determined dew point temperature and the determined absolute moisture content of the air are the dew point temperature and the absolute moisture content of the air in the current environment of the air-conditioning heat exchanger where the frosting problem may occur. For example, for an outdoor air conditioner heat exchanger which may have a frosting problem during air conditioning refrigeration, the determined dew point temperature is the outdoor dew point temperature, and the determined absolute moisture content of the air is the absolute moisture content of the outdoor air. For example, in an indoor air-conditioning heat exchanger in which a problem of frost formation may occur during air-conditioning heating, the determined dew point temperature is an indoor dew point temperature, and the determined absolute moisture content of the air is an indoor air absolute moisture content.
By way of example, may be
The dew point temperature of the environment in which the air conditioner heat exchanger is currently located is determined (an example is represented by T _ d). And a and b are preset constants for adjusting the value range of the dew point temperature, and lambda is an intermediate quantity for representing the indirect relation between the dew point temperature and the relative humidity and the ambient temperature of the environment. By way of example, may be
Determines the intermediate quantity lambda. Wherein, T represents the ambient temperature of the current environment of the air-conditioning heat exchanger, and U represents the ambient relative humidity of the current environment of the air-conditioning heat exchanger. In addition, due to relative environmentThe value range of the humidity is 0-100, so that the ratio of the relative humidity of the environment to 100 can approximately represent the humidity state of the current environment of the air-conditioning heat exchanger. In the embodiment of the present disclosure, the preset constant a may be set to 17.27, and the preset constant b may be set to 237.7. Of course, the preset constant may also be set to other values according to actual requirements, and the set value of the preset constant is not specifically limited in this disclosure.
By way of example, may be
In this way, the absolute moisture content of the air in the environment in which the air-conditioning heat exchanger is currently located is determined (an example is denoted by d). Wherein Pw represents the partial pressure of the ambient water vapor in the current environment of the air-conditioning heat exchanger. In one embodiment, the partial pressure Pw of the water vapor in the environment where the air conditioner heat exchanger is currently located may be determined by the ambient temperature of the environment where the air conditioner is currently located and the ambient relative humidity of the environment where the air conditioner is currently located. For example, Pw ═ can be passed (0.0808T)3-1.0435T2+91.38T +309.45) × U, the ambient water vapour partial pressure Pw is determined. Wherein, T represents the ambient temperature of the current environment of the air-conditioning heat exchanger, and U represents the ambient relative humidity of the current environment of the air-conditioning heat exchanger.
In step S22, the dew point temperature is temperature compensated based on the preset compensation temperature and the absolute moisture content of the air.
In the embodiment of the disclosure, the preset compensation temperature is used for compensating the temperature influence of the air conditioner fan on the dew point temperature. In other words, the preset compensation temperature may be determined by the fan speed in the case of determining the air conditioner fan speed. The dew point temperature is compensated by the preset compensation temperature, so that the accuracy of the subsequently determined critical coil temperature can be improved.
In step S23, a critical coil temperature of the air conditioning heat exchanger is determined based on the compensated dew point temperature.
According to the coil temperature control method provided by the embodiment of the disclosure, the temperature compensation of the dew point temperature can be realized through presetting the compensation temperature and the absolute moisture content of air, and the critical coil temperature of the air-conditioning heat exchanger can be obtained.
In addition, in the above embodiments, when determining the dew point temperature and the absolute moisture content of the air, the ambient temperature T and the ambient relative humidity U may be detected by corresponding detecting elements disposed in the air conditioner. For example, the ambient temperature of the environment in which the air conditioner is currently located may be detected by a temperature detection element (e.g., a thermometer) provided to the air conditioner. For another example, the ambient relative humidity of the environment in which the air conditioner is currently located may be detected by a humidity detection element (e.g., a hygrometer) disposed in the air conditioner. In addition, the ambient temperature and/or ambient relative humidity sent by the server can be received by means of subscribing to the server. In one embodiment, an environmental parameter subscription request may be initiated to a station, such as a weather station, which may provide environmental parameter monitoring services, and the environmental parameters sent by the weather station may be periodically received after the subscription is successful. For example, the air conditioner may initiate a subscription request to a weather station and periodically receive the outdoor environment temperature and/or outdoor environment relative humidity sent by the weather station. Of course, the ambient temperature and/or the outdoor environment may be obtained in other manners, which is not specifically limited by the present disclosure.
For example, in the case where the dew point temperature and the absolute moisture content of the air are determined, the critical coil temperature may be obtained by temperature compensating the dew point temperature as follows.
Fig. 3 is a flowchart illustrating another method for determining a critical coil temperature of an air conditioner heat exchanger according to an exemplary embodiment, and as shown in fig. 3, steps S31 and S34 in the embodiment of the present disclosure are similar to steps S21 and S23 in fig. 2, and are not described herein again.
In step S32, the difference between the dew point temperature and the preset compensation temperature is determined, and the ratio between the absolute moisture content of the air and the preset absolute moisture content of the air is determined.
For example, the difference between the dew point temperature and the preset compensation temperature can be represented by T _ d-m for the dew point temperature T _ d and the preset compensation temperature m. The ratio between the determined air absolute moisture content and the preset air absolute moisture content can be represented by d/d _ set for the air absolute moisture content d and the preset air absolute moisture content d _ set.
In step S33, the compensated dew point temperature is obtained by the sum of the difference and the ratio.
For example, in the case where the difference between the dew point temperature and the preset compensation temperature (an example is represented by T _ d-m) and the ratio between the absolute moisture content of air and the preset absolute moisture content of air (an example is represented by d/d _ set) are determined, the compensated dew point temperature may be represented by (T _ d-m) + d/d _ set. Further, when the compensated dew point temperature is obtained, the critical coil temperature (for example, T _ e _ target) may be obtained by setting T _ e _ target to (T _ d-m) + d/d _ set.
In the embodiment of the disclosure, corresponding temperature compensation can be respectively set for the outdoor heat exchanger and the outdoor heat exchanger, and the critical coil temperature is determined according to relevant parameters including preset temperature compensation of the matched heat exchanger. For example, T _ e _ target may be equal to T _ d _ out-m for the outdoor heat exchanger1And determining the critical coil temperature of the heat exchanger outside the matching chamber in the mode of + d _ out/d _ set. Wherein T _ d _ out represents outdoor dew point temperature, d _ out represents outdoor air absolute moisture content, and m1Indicating preset temperature compensation of the matching outdoor side heat exchanger (exemplary, m)1May be set to 4), d _ set represents a preset absolute moisture content of air. For example, T _ e _ target may be T _ d _ in-m for the indoor-side heat exchanger2And determining the critical coil temperature of the heat exchanger outside the matching chamber in the mode of + d _ in/d _ set. Wherein T _ d _ out represents outdoor dew point temperature, d _ out represents outdoor air absolute moisture content, and m2Indicating preset temperature compensation of the matching outdoor side heat exchanger (exemplary, m)2May be set to any value in the range of 8 to 7.5), d _ set represents a preset absolute moisture content of air.
In one embodiment, the temperature of the coil of the air conditioner heat exchanger can be adjusted by adjusting the operating frequency of the air conditioner compressor.
Fig. 4 is a flowchart illustrating a method for adjusting a current coil temperature of an air conditioner based on a critical coil temperature, according to an exemplary embodiment, as shown in fig. 4, including the following steps.
In step S41, a target temperature difference between the critical coil temperature and the current coil temperature of the air conditioner is determined.
Illustratively, the temperature difference between the critical air conditioning coil temperature and the current coil temperature may be represented by T _ e _ target-T _ e for the critical air conditioning coil temperature (exemplified by T _ e _ target) and the current coil temperature (exemplified by T _ e).
In step S42, a target compressor frequency variation value that matches the target temperature difference value is determined based on the correspondence between the temperature difference value and the compressor frequency variation value of the air conditioner.
For example, the correspondence between the temperature difference values and the compressor frequency variation values of the air conditioner may be a predetermined and stored correspondence, and the same or different compressor frequency variation values are matched for any target temperature difference value. The compressor frequency variation value can be understood as a working frequency difference value between the current working frequency of the compressor and the working frequency to which the compressor is to be adjusted.
In step S43, the frequency of the compressor of the air conditioner is adjusted by the target compressor frequency variation value to adjust the current coil temperature.
In the embodiment of the present disclosure, the frequency of the compressor of the air conditioner is adjusted according to the target compressor frequency variation value, for example, the operating frequency to which the compressor is to be adjusted may be determined according to the current operating frequency of the compressor and the target compressor frequency variation value. Further, the operating frequency of the compressor may be adjusted to the operating frequency to which the compressor is to be adjusted such that the current coil temperature is greater than or equal to the critical coil temperature. The self-adaptive temperature control of the current coil temperature of the air conditioner can be realized by adjusting the frequency of the compressor.
In one embodiment, the correspondence between the temperature difference and the frequency variation value of the air conditioner compressor may be predetermined and stored in a correspondence table, so as to be invoked when the current coil temperature needs to be adjusted.
Fig. 5 is a diagram illustrating a correspondence table between a temperature difference value and a frequency variation value of an air conditioner compressor according to an exemplary embodiment. For example, as shown in fig. 5, in the case of determining the target temperature difference value, a temperature difference value range in which the target temperature difference value is located may be searched in the correspondence table, and when determining the temperature difference value range in which the target temperature difference value is located, the compressor frequency variation value matching the temperature difference value range may be determined as the target compressor frequency variation value. For example, if a target temperature difference between the critical coil temperature and the current coil temperature of the air conditioner is determined to be 1.2, the target temperature difference may be determined to be within a temperature difference range of (1, 2.5) and thus a target compressor frequency variation value of-6. further, the compressor may be frequency adjusted by determining an operating frequency to which the compressor is to be adjusted based on the current operating frequency of the compressor (e.g., p) by determining a sum of the current operating frequency of the compressor and the target compressor frequency variation value (e.g., p + (-6)).
In addition, it can be understood that, in the case that the current coil temperature is greater than or equal to the critical coil temperature, the current coil temperature is maintained, and the current coil temperature can also be maintained through a corresponding relation table between the temperature difference value and the compressor frequency change value. For example, as shown in fig. 5, if it is determined that the target temperature difference between the critical coil temperature and the current coil temperature of the air conditioner is-1, it may be determined that the temperature difference range in which the target temperature difference is located is (∞, 0.) since the compressor frequency variation value matching the temperature difference range (∞, 0] is 0, it is possible to maintain the compressor frequency variation value unchanged, and thus to achieve the maintenance of the current coil temperature.
In the embodiment of the disclosure, the execution condition for monitoring the current coil temperature can be preset, and then before the current coil temperature is monitored, whether the air conditioner meets the execution condition for monitoring the current coil temperature is judged, so that the temperature of the coil of the air conditioner heat exchanger is controlled under a specific scene.
Fig. 6 is a flowchart illustrating another method for controlling the temperature of the coil according to an exemplary embodiment, and as shown in fig. 6, steps S52a and S52b in this embodiment of the disclosure are similar to steps S12a and S12b in fig. 1, and are not described herein again.
In step S51, in a case where it is determined that the execution condition for monitoring the current coil temperature is satisfied, the current coil temperature of the air-conditioning heat exchanger is monitored, and the critical coil temperature of the air-conditioning heat exchanger is determined.
Exemplary implementation conditions that are satisfied to monitor the current coil temperature include one or a combination of the following. For convenience of description, a temperature threshold value set for a temperature difference between an indoor ambient temperature and a set temperature is referred to as a first temperature threshold value, a temperature threshold value set for an ambient temperature of an environment in which a heat exchanger is currently located is referred to as a second temperature threshold value, and a temperature threshold value set for a current coil temperature of an air conditioner is referred to as a third temperature threshold value.
Executing the condition one: the temperature difference between the indoor ambient temperature and the set temperature is less than a first temperature threshold.
The set temperature may be a temperature set by a user when the user performs cooling or heating through an air conditioner. By executing the first condition, the current indoor environment temperature can be ensured to meet the user requirement. Based on this, the frosting problem of the air conditioner heat exchanger can be further prevented or improved under the condition that the requirement of a user for the indoor environment temperature is preferentially ensured.
For example, to ensure that the indoor ambient temperature can meet the user's requirements, the first temperature threshold should be set as small as possible. Specifically, the first temperature threshold may be set to 4 ℃, or any other temperature that may meet the actual usage requirements.
And executing a second condition: the running time of the air conditioner compressor reaches the specified time.
Similar to the first execution condition, the second execution condition can indirectly ensure that the current indoor environment temperature can meet the user requirement in a manner of ensuring the refrigeration or heating time. Based on this, the frosting problem of the air conditioner heat exchanger can be further prevented or improved under the condition that the requirement of a user for the indoor environment temperature is preferentially ensured. Specifically, the specified time period may be set to 20 minutes, or any other time period that can meet the actual use requirement.
In addition, because the indoor ambient temperature is usually relatively stable, the condition that the indoor side heat exchanger does not frost is basically avoided aiming at the refrigeration scene. In other words, for a cooling scenario, no matter what the current temperature state of the air conditioner and the environment in which the air conditioner is located, it is often necessary to prevent frosting in a manner that controls the temperature of the coil. However, in a heating scenario, if the current temperature state of the air conditioner and the environment where the air conditioner is located is in a specific temperature state, defrosting need not be prevented. For example, in a heating scenario, the coil temperature and the ambient temperature of the environment in which the heat exchanger is currently located may be high. In this case, the heat exchanger will generally not exhibit frosting.
Based on this, for the refrigeration scene, only through carrying out condition one and/or carrying out condition two can satisfy the coil pipe temperature control demand. For the heating scene, the execution condition three can be set in the following way, so as to carry out preliminary judgment on the current temperature states of the air conditioner and the environment.
And the execution condition is three: the ambient temperature of the environment where the heat exchanger is currently located is smaller than or equal to the second temperature threshold, and the current coil temperature of the air conditioner is smaller than or equal to the third temperature threshold.
Specifically, the second temperature threshold may be set to 5 ℃, or any other temperature that can meet the actual usage requirements, and the third temperature threshold may be set to-2 ℃, or any other temperature that can meet the actual usage requirements.
The present disclosure describes a coil temperature control process of an air conditioner heat exchanger by taking an air conditioner heating scene as an example.
FIG. 7 is a flow chart illustrating coil temperature control for an air conditioning heating scenario, according to an exemplary embodiment.
For example, as shown in fig. 7, for an air conditioning heating scenario, whether to perform coil temperature control may be determined by a preset execution condition. For example, it is possible to set the execution condition one that the temperature difference between the indoor ambient temperature and the set temperature is less than or equal to 4 ℃ (for example, represented by T _ set-T _ in < > 4 ℃), the execution condition two that the operation time period of the air conditioner compressor reaches 20 minutes, and the execution condition three that the outdoor ambient temperature is less than or equal to the second temperature threshold and the current coil temperature of the outdoor side heat exchanger is less than or equal to the third temperature threshold (for example, represented by T _ out < 5 ℃ and T _ e < -2 ℃). Further, when it is determined that one or more execution conditions cannot be met currently, the process may be ended, and the subsequent coil temperature adjustment process may not be executed, or when it is determined that all of the execution condition one, the execution condition two, and the execution condition three are met, the coil temperature adjustment may be triggered to be executed.
For example, if it is determined that the first, second, and third execution conditions are currently satisfied, the outdoor dew point temperature and the absolute moisture content of the outdoor air may be determined according to the outdoor ambient temperature and the outdoor relative humidity, and then the critical coil temperature matching the outdoor air-conditioning heat exchanger may be determined according to the outdoor dew point temperature and the absolute moisture content of the outdoor air. The determination of the dew point temperature, the absolute moisture content of the air and the critical coil temperature are described in the above embodiments, and reference may be made to any of the above embodiments for relevant information.
On the basis, a target temperature difference value between the critical coil temperature and the current coil temperature of the outdoor heat exchanger can be determined, and a target compressor frequency change value matched with the target temperature difference value is determined according to the corresponding relation between the temperature difference value stored in advance and the compressor frequency change value. Based on the above, the compressor frequency can be adjusted through the target compressor frequency change value, so that the current coil temperature of the outdoor side heat exchanger is larger than or equal to the critical coil temperature. Therefore, the temperature of the coil of the air-conditioning heat exchanger can be always kept at a temperature value which is greater than or equal to the critical coil temperature, so that the frosting problem of the air-conditioning heat exchanger is prevented or improved.
In addition, the control method of the coil temperature for the air-conditioning refrigeration scene is similar to the control method for the air-conditioning heating scene, and related contents may refer to the coil temperature control process for the air-conditioning heating scene, which is not described herein again.
Based on the same conception, the embodiment of the disclosure also provides a coil temperature control device.
It is understood that the coil temperature control device provided by the embodiment of the present disclosure includes hardware structures and/or software modules for performing the above functions. The disclosed embodiments can be implemented in hardware or a combination of hardware and computer software, in combination with the exemplary elements and algorithm steps disclosed in the disclosed embodiments. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
FIG. 8 is a block diagram illustrating a coil temperature control apparatus according to an exemplary embodiment. Referring to fig. 8, the apparatus 100 includes a monitoring unit 101, a determining unit 102, and a processing unit 103.
And the monitoring unit 101 is used for monitoring the current coil temperature of the air conditioner heat exchanger. The determining unit 102 is configured to determine a critical coil temperature of the air-conditioning heat exchanger, where the critical coil temperature is a minimum coil temperature that ensures that no frost is formed on a coil of the current air-conditioning heat exchanger. The processing unit 103 is configured to, when the current coil temperature is monitored to be lower than the critical coil temperature, adjust the current coil temperature until the current coil temperature is higher than or equal to the critical coil temperature.
In one embodiment, the determining unit 102 determines the critical coil temperature of the air conditioner heat exchanger by: and determining the dew point temperature and the absolute moisture content of the air of the current environment of the air-conditioning heat exchanger. And carrying out temperature compensation on the dew point temperature based on the preset compensation temperature and the absolute moisture content of the air. And determining the critical coil temperature of the air-conditioning heat exchanger based on the compensated dew point temperature.
In one embodiment, the determining unit 102 performs temperature compensation on the dew point temperature based on the preset compensation temperature and the absolute moisture content of the air in the following manner: the difference between the dew point temperature and the preset compensation temperature is determined, and the ratio between the absolute moisture content of the air and the preset absolute moisture content of the air is determined. And obtaining the compensated dew point temperature through the sum of the difference value and the ratio.
In one embodiment, the processing unit 103 adjusts the current coil temperature of the air conditioner based on the critical coil temperature in the following manner: a target temperature difference between the critical coil temperature and a current coil temperature of the air conditioner is determined. And determining a target compressor frequency change value matched with the target temperature difference value based on the corresponding relation between the temperature difference value and the compressor frequency change value of the air conditioner. And adjusting the frequency of the compressor of the air conditioner according to the target compressor frequency change value so as to adjust the current coil temperature.
In one embodiment, the determining unit 102 is further configured to: before monitoring the current coil temperature of the air-conditioning heat exchanger, determining that an execution condition for monitoring the current coil temperature is met, wherein the execution condition for monitoring the current coil temperature comprises one or the combination of the following conditions: the temperature difference between the indoor ambient temperature and the set temperature is less than a first temperature threshold. The running time of the air conditioner compressor reaches the specified time. The ambient temperature of the environment where the heat exchanger is currently located is smaller than or equal to the second temperature threshold, and the current coil temperature of the air conditioner is smaller than or equal to the third temperature threshold.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
FIG. 9 is a block diagram illustrating an apparatus 200 for coil temperature control according to an exemplary embodiment. For example, the apparatus 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 9, the apparatus 200 may include one or more of the following components: a processing component 202, a memory 204, a power component 206, a multimedia component 208, an audio component 210, an input/output (I/O) interface 212, a sensor component 214, and a communication component 216.
The processing component 202 generally controls overall operation of the device 200, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 202 may include one or more processors 220 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 202 can include one or more modules that facilitate interaction between the processing component 202 and other components. For example, the processing component 202 can include a multimedia module to facilitate interaction between the multimedia component 208 and the processing component 202.
The memory 204 is configured to store various types of data to support operations at the apparatus 200. Examples of such data include instructions for any application or method operating on the device 200, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 204 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 208 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 200 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 210 is configured to output and/or input audio signals. For example, audio component 210 includes a Microphone (MIC) configured to receive external audio signals when apparatus 200 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 204 or transmitted via the communication component 216. In some embodiments, audio component 210 also includes a speaker for outputting audio signals.
The I/O interface 212 provides an interface between the processing component 202 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 214 includes one or more sensors for providing various aspects of status assessment for the device 200. For example, the sensor assembly 214 may detect an open/closed state of the device 200, the relative positioning of components, such as a display and keypad of the device 200, the sensor assembly 214 may also detect a change in the position of the device 200 or a component of the device 200, the presence or absence of user contact with the device 200, the orientation or acceleration/deceleration of the device 200, and a change in the temperature of the device 200. The sensor assembly 214 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 214 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 216 is configured to facilitate wired or wireless communication between the apparatus 200 and other devices. The device 200 may access a wireless network based on a communication standard, such as WiFi, 4G or 5G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 200 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as memory 204, comprising instructions executable by processor 220 of device 200 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the scope of the appended claims.
Claims (8)
1. A method of coil temperature control, the method comprising:
monitoring the current coil temperature of an air-conditioning heat exchanger, and determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the air-conditioning heat exchanger does not frost;
if the current coil temperature is monitored to be lower than the critical coil temperature, the current coil temperature is adjusted until the current coil temperature is higher than or equal to the critical coil temperature.
2. The coil temperature control method of claim 1, wherein the determining a critical coil temperature of the air conditioning heat exchanger comprises:
determining the dew point temperature and the absolute moisture content of the air of the current environment of the air-conditioning heat exchanger;
performing temperature compensation on the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air;
and determining the critical coil temperature of the air-conditioning heat exchanger based on the compensated dew point temperature.
3. The coil temperature control method of claim 2, wherein temperature compensating the dew point temperature based on a preset compensation temperature and the absolute moisture content of the air comprises:
determining a difference between the dew point temperature and the preset compensation temperature, and determining a ratio between the absolute moisture content of the air and a preset absolute moisture content of the air;
and obtaining the compensated dew point temperature through the sum of the difference and the ratio.
4. The coil temperature control method according to any one of claims 1 to 3, wherein adjusting the current coil temperature of the air conditioner based on the critical coil temperature comprises:
determining a target temperature difference between the critical coil temperature and a current coil temperature of the air conditioner;
determining a target compressor frequency change value matched with the target temperature difference value based on the corresponding relation between the temperature difference value and the compressor frequency change value of the air conditioner;
and adjusting the frequency of the compressor of the air conditioner according to the target compressor frequency change value so as to adjust the current coil temperature.
5. The coil temperature control method of claim 1, wherein prior to monitoring the current coil temperature of the air conditioning heat exchanger, the method further comprises:
determining that execution conditions for monitoring the current coil temperature are met, wherein the execution conditions for monitoring the current coil temperature include one or a combination of the following:
the temperature difference between the indoor environment temperature and the set temperature is smaller than a first temperature threshold;
the running time of the air-conditioning compressor reaches a specified time;
the ambient temperature of the current environment of the heat exchanger is smaller than or equal to a second temperature threshold, and the current coil temperature of the air conditioner is smaller than or equal to a third temperature threshold.
6. A coil temperature control apparatus for performing the coil temperature control method of any one of claims 1 to 5, the apparatus comprising:
the monitoring unit is used for monitoring the current coil temperature of the air-conditioning heat exchanger;
the determining unit is used for determining the critical coil temperature of the air-conditioning heat exchanger, wherein the critical coil temperature is the minimum coil temperature which ensures that the coil of the air-conditioning heat exchanger does not frost currently;
and the processing unit is used for adjusting the current coil temperature under the condition that the current coil temperature is monitored to be less than the critical coil temperature until the current coil temperature is greater than or equal to the critical coil temperature.
7. A coil temperature control device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: performing the coil temperature control method of any one of claims 1 to 5.
8. A storage medium having instructions stored therein, wherein the instructions when executed by a processor enable the processor to perform the method of coil temperature control of any one of claims 1 to 5.
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