CN113847741B - Method and device for defrosting water heater, water heater and storage medium - Google Patents
Method and device for defrosting water heater, water heater and storage medium Download PDFInfo
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- CN113847741B CN113847741B CN202111007220.3A CN202111007220A CN113847741B CN 113847741 B CN113847741 B CN 113847741B CN 202111007220 A CN202111007220 A CN 202111007220A CN 113847741 B CN113847741 B CN 113847741B
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- operating frequency
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- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
Abstract
The application relates to the technical field of intelligent household appliances, and discloses a method for defrosting a water heater, which comprises the following steps: acquiring a defrosting temperature value; under the condition that the defrosting temperature value is larger than the temperature threshold value, controlling the compressor to operate in a first mode to defrost; and under the condition that the defrosting temperature value is less than or equal to the temperature threshold value, controlling the compressor to operate in a second mode to perform freezing and defrosting. And judging whether the operation mode of the compressor needs a defrosting mode of anti-freezing protection or not through the comparison of the defrosting temperature value and the temperature threshold value. Therefore, the operation frequency of the compressor can be regulated by setting a higher temperature threshold value under the condition that the heat exchanger is not frozen, so that the compressor can be always in an operation state in the whole defrosting process without stopping, and the stability of the system is improved. The application also discloses a device for defrosting the water heater, the water heater and a storage medium.
Description
Technical Field
The application relates to the technical field of intelligent household appliances, and for example relates to a method and device for defrosting a water heater, the water heater and a storage medium.
Background
At present, the plate heat exchanger is configured as a heat exchange unit of the water heater due to the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, long service life and the like. However, when the ascending defrosting mode is operated under the low temperature condition, the evaporation temperature in the ascending process is lower, the phenomenon that the plate heat exchanger is frozen can occur, and the plate heat exchanger can be damaged when serious, so that the evaporator can not exchange heat, the refrigerant can not evaporate, and adverse effects such as liquid return of the compressor are caused.
In order to avoid the damage of the heat exchanger caused by the freezing phenomenon, the prior art judges whether the compressor needs to be stopped or not by comparing the water temperature at the middle lower part of the water tank with the lowest temperature of the water tank during use, and starts electric auxiliary heat to heat the water after the compressor is stopped. In this way, although protection against freezing is achieved, the compressor is shut down for heating to a suitable temperature and then started for continued operation.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
when the water heater operates in the ascending defrosting mode, in order to avoid the occurrence of freezing phenomenon, the compressor needs to be started and stopped frequently, and therefore the stability of the system is poor.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method and a device for defrosting a water heater, the water heater and a storage medium, so as to avoid frequent start and stop of a compressor in the process of ascending frequency defrosting and improve the stability of a system.
In some embodiments, the water heater includes a compressor and an outdoor heat exchanger; the method for defrosting the water heater comprises the following steps: acquiring a defrosting temperature value; under the condition that the defrosting temperature value is larger than the temperature threshold value, controlling the compressor to operate in a first mode to defrost; and under the condition that the defrosting temperature value is less than or equal to the temperature threshold value, controlling the compressor to operate in a second mode to perform freezing and defrosting.
In some embodiments, the apparatus for defrosting a water heater includes: a processor and a memory storing program instructions, the processor being configured to perform a method for defrosting a water heater as described above when the program instructions are executed.
In some embodiments, a water heater includes: a compressor, an outdoor heat exchanger and the device for defrosting the water heater.
In some embodiments, a storage medium stores program instructions that, when executed, perform a method for defrosting a water heater as described above.
The method and the device for defrosting the water heater, the water heater and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:
and judging whether the operation mode of the compressor needs a defrosting mode of anti-freezing protection or not through the comparison of the defrosting temperature value and the temperature threshold value. Compared with the prior art that the temperature value through the middle and lower part of the water tank has a certain delay in the change of the temperature value, the defrosting temperature value is closer to the part which is easy to generate the freezing phenomenon, and the feedback temperature value is more accurate. Therefore, the operation frequency of the compressor can be adjusted by setting a higher temperature threshold value under the condition that the heat exchanger is not frozen, so that the compressor can be always in an operation state in the whole defrosting process without stopping, further frequent starting and stopping of the compressor of the water heater in the ascending defrosting process caused by the freezing phenomenon are avoided, and the stability of the system is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
FIG. 1 is a schematic illustration of a method for defrosting a water heater provided in an embodiment of the disclosure;
fig. 2 is a schematic view of an apparatus for defrosting a water heater provided in an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.
Referring to fig. 1, an embodiment of the present disclosure provides a method for defrosting a water heater, including:
s01, the water heater acquires a defrosting temperature value.
And S02, controlling the compressor to operate in a first mode to defrost under the condition that the defrosting temperature value of the water heater is larger than the temperature threshold value.
S03, controlling the compressor to operate in a second mode to prevent freezing and defrosting under the condition that the defrosting temperature value of the water heater is smaller than or equal to the temperature threshold value.
By adopting the defrosting method for the water heater, provided by the embodiment of the invention, whether the operation mode of the compressor needs to be subjected to the defrosting mode of anti-freezing protection can be judged through the comparison of the defrosting temperature value and the temperature threshold value. Compared with the method for judging whether to stop defrosting by the water temperature value at the middle and lower parts of the water tank in the prior art, the method has the advantage that the temperature value change possibly has a certain delay. In the method provided by the embodiment of the disclosure, the defrosting temperature value is closer to a part which is easy to generate a freezing phenomenon, and the feedback temperature value is more accurate. Therefore, the water heater can adjust the running frequency of the compressor by setting a higher temperature threshold value under the condition that the heat exchanger has not frozen, so that the compressor can be always in a running state in the whole defrosting process without stopping, further, the frequent start and stop of the compressor of the water heater in the ascending defrosting process caused by the freezing phenomenon are avoided, and the stability of the system is improved.
Optionally, the defrost temperature value of the water heater comprises one or more of an ambient temperature, a surface temperature of the outdoor heat exchanger, or a temperature of the refrigerant inlet side of the outdoor heat exchanger.
In this way, the compressor operation can be better protected by configuring the ambient temperature value as the defrost temperature than in the prior art by utilizing the water temperature in the lower portion of the water tank to determine whether frosting has occurred. The method and the device can judge whether the heat exchanger is frozen according to the value of the ambient temperature by corresponding the value of the ambient temperature to the situation of whether frosting occurs or not, so that the operation mode of the compressor is regulated to defrost before the ambient temperature is higher than the temperature at which the freezing is likely to occur. Meanwhile, the environment temperature is adopted as the defrosting temperature, the defrosting temperature is not limited to the temperature sensor arranged at a fixed position, the data collected by other intelligent household appliances can be matched for use, or the temperature sensor with the adjustable position is arranged on an external machine of the water heater, and the defrosting temperature can be automatically installed according to the actual use condition.
The actual running temperature of the heat exchanger can be more intuitively judged through the surface temperature of the outdoor heat exchanger. According to the temperature of the surface of the heat exchanger, the running mode of the compressor is adjusted as a judging standard, so that inaccuracy caused by judging the water temperature of the middle and lower parts of the water tank in the prior art can be avoided, the actual temperature value of the heat exchanger is more approximate, the state of the heat exchanger can be better judged, and the running mode of the compressor is adjusted. Meanwhile, the defrosting temperature sensor is arranged on the surface of the heat exchanger, so that the sensor can be replaced conveniently when maintenance of the sensor fails.
The defrosting temperature of the water heater can also be taken as the temperature of the refrigerant inlet side of the outdoor heat exchanger. The temperature difference between the refrigerant inlet side and the heat medium inlet side caused by the design mode of the plate heat exchanger is large, so that the most probable freezing phenomenon in the whole heat exchanger is positioned at the refrigerant inlet side of the outdoor heat exchanger. Therefore, whether the heat exchanger is frozen or not is judged through the temperature value of the refrigerant inlet side of the outdoor heat exchanger, and compared with the temperatures of other positions, the temperature value of the position is the most accurate, so that the most visual reaction can be carried out on whether the heat exchanger is frozen or not in the current running state of the compressor.
Also, any two or all of the parameters of the ambient temperature, the surface temperature of the outdoor heat exchanger, or the temperature of the refrigerant inlet side of the outdoor heat exchanger may be used simultaneously. Compared with the situation of using a single parameter, the method uses the parameters at a plurality of different positions to judge whether the freezing phenomenon occurs or not, can effectively avoid the influences of errors, deviations and the like caused by the single parameter, and can avoid the situations of single fault, damage or inaccurate test and the like through the combined action of multiple parameters. Further, the multi-parameter usage process may be combined, or may be divided into corresponding priorities, or may be combined with the combined usage of priorities. For example, the priority of the ambient temperature is greater than the surface temperature of the outdoor heat exchanger than the temperature of the refrigerant inlet side of the outdoor heat exchanger; or, if the ambient temperature reaches the threshold value, judging whether the surface temperature of the outdoor heat exchanger and the temperature of the refrigerant inlet side of the outdoor heat exchanger reach the threshold value; alternatively, if the ambient temperature reaches the threshold value, it is determined whether or not either the surface temperature of the outdoor heat exchanger or the temperature of the refrigerant inlet side of the outdoor heat exchanger reaches the threshold value. For example only, the specific priority may be set by the actual application or the user's needs.
Optionally, the water heater controls the compressor to operate in a second mode, comprising: according to the heat value P, the enthalpy change value delta h and the stroke volume V required by the heat exchanger for preventing freezing st Determining critical operating frequency f 0 The method comprises the steps of carrying out a first treatment on the surface of the According to the critical operating frequency f 0 The operating frequency of the compressor is adjusted. Wherein the unit of the heat value P required by the heat exchanger for preventing freezing is kW; the unit of the enthalpy change value delta h is kJ/kg; stroke volume V st In cm 3
Therefore, the threshold value reached by the running frequency of the current compressor can be judged better according to the stroke volume of the compressor, the enthalpy change value generated in the running process of the heat exchanger and the heat value required under the current condition, and the running frequency of the compressor is ensured to be enough to support the heat exchanger to generate enough heat value required.
Optionally, the water heater is based on the heat value P, the enthalpy change value Deltah and the stroke volume V required for the heat exchanger to prevent freezing st Determining critical operating frequency f 0 Comprising: calculation ofWherein the unit of delta h is kJ/kg; v (V) st In cm 3 ；f 0 The unit is Hz; p is kW; the parameter 1000000 is the product of the specific volume value and the unit conversion quantity, and the unit is consistent with the specific volume value unit and is m 3 /kg. It should be noted here that the specific volume value is a predetermined fixed value of 1m 3 Kg,1000000 cm 3 And m is equal to 3 Is a unit conversion amount of (a).
Therefore, the threshold value reached by the running frequency of the current compressor can be judged better according to the stroke volume of the compressor, the enthalpy change value generated in the running process of the heat exchanger and the heat value required under the current condition, and the running frequency of the compressor is ensured to be enough to support the heat exchanger to generate enough heat value required. Wherein 1000000 is the adjustment parameter added in standard unit for adjusting critical operation frequency.
Optionally, the method for obtaining the heat value P required by the freezing prevention of the heat exchanger comprises the following steps: obtaining inflow temperature T of inflow port of heat exchanger w And water flow rate q w The method comprises the steps of carrying out a first treatment on the surface of the According to inflow temperature T w And water flow rate q w The heat value P required for the heat exchanger to prevent freezing is determined.
In this way, the heat quantity value required by the corresponding heat exchanger for preventing freezing can be calculated better through the temperature of the inflow part of the heat exchanger and the water flow of the inflow part. And the heat value required by the phenomenon that the heat exchanger is frozen can be avoided, and the increase of the cost and the reduction of the system stability caused by stopping and thawing after the heat exchanger is frozen are prevented.
Optionally, the water heater is based on the inflow temperature T w And water flow rate q w Determining a heat value P required for freeze prevention of the heat exchanger, comprising: calculation of p=c×ρ×q w ×T w The method comprises the steps of carrying out a first treatment on the surface of the Wherein, C is the specific heat capacity of the refrigerant, and ρ is the density of the refrigerant.
In this way, the heat quantity value required by the corresponding heat exchanger for preventing freezing can be calculated better through the temperature of the inflow part of the heat exchanger and the water flow of the inflow part. And the heat value required by the phenomenon that the heat exchanger is frozen can be avoided, and the increase of the cost and the reduction of the system stability caused by stopping and thawing after the heat exchanger is frozen are prevented. Wherein T in the formula w The amount of change Δt of the temperature is assumed, and here Δt=t is assumed because freezing of the outdoor unit is mainly caused by condensation of water vapor in the air w Therefore, directly connect T w Substituting the calculated values into a formula to perform calculation. T in the formula in the presence of other coagulable substances w Should be correspondingly replaced by T w Difference from the condensation temperature of the condensables.
Optionally, the method for obtaining the enthalpy change value Δh by the water heater includes: obtaining a first enthalpy value h at the inlet of the heat exchanger 1 And a second enthalpy value h at the outlet 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the second enthalpy value h 2 And a first enthalpy value h 1 And the difference is set to the enthalpy change value Δh.
In this way, the heat quantity value required for freezing prevention can be better calculated, and the critical operating frequency of the compressor can be accurately calculated. The temperature difference between the refrigerant inflow port side and the heat medium inflow port side is large due to the inherent characteristics of the plate heat exchanger. Therefore, the enthalpy value at the inlet is calculated by acquiring the pressure value and the temperature value of the refrigerant at the inlet of the heat exchanger; similarly, the enthalpy value at the outlet is calculated by acquiring the pressure value and the temperature value of the refrigerant at the outlet of the heat exchanger. By setting the difference value of the enthalpy values at the inlet and the outlet as the enthalpy change value required in the freezing prevention process, the operation frequency of the compressor is calculated more accurately.
Optionally, the water heater operates according to a critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising: at an operating frequency greater than the critical operating frequency f 0 In the case of controlling the operating frequency of the compressor to decrease below the critical operating frequency f 0 The method comprises the steps of carrying out a first treatment on the surface of the Controlling the operating frequency of the compressor to be continuously less than the critical operating frequency f 0 The duration of (2) reaches a first set duration.
Therefore, the compressor can be better protected in the running process, and the compressor is prevented from being impacted. Under the condition that a defrosting mode needing to be frozen prevention is detected, the temperature of the outlet end of the heat exchanger reaches a threshold value, so that the operation frequency of the compressor is too high, the refrigerant outlet end of the heat exchanger can be quickly frozen, in order to avoid the phenomenon, the operation frequency of the compressor needs to be reduced to be lower than a critical operation frequency, the compressor is controlled to operate at the operation frequency for a period of time, the refrigerant flow in the heat exchanger reaches a stable value, and impact and damage to the compressor due to freezing are avoided.
Optionally, the water heater operates according to a critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising: at an operating frequency less than the critical operating frequency f 0 In the case of (a), the operating frequency of the compressor is controlled to rise to the critical operating frequency f 0 。
Thus, the operation frequency of the compressor can be better increased to the critical operation frequency under the condition that the refrigerant flow rate in the heat exchanger is stable. Therefore, under the condition of avoiding impact and damage to the compressor, the operation frequency of the compressor is improved, the heat value produced by the heat exchanger is further improved, and the phenomenon that the heat exchanger is frozen is avoided.
Optionally, the water heater operates according to a critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising: obtaining a plurality of buffer operation frequency values according to the difference value between the operation frequency and the critical operation frequency; respectively obtaining the buffer operation time length corresponding to each buffer operation frequency value according to a preset corresponding relation; and adjusting the operation frequency of the compressor to each buffer operation frequency value in sequence from small to large according to the buffer operation frequency value, and controlling the operation time of the operation frequency of the compressor continuously at each buffer operation frequency value to reach the corresponding buffer operation time.
Thus, the impact on the compressor caused by the rapid adjustment of the operating frequency of the compressor can be better avoided. The operating frequency of the compressor is gradually and slowly increased, and the compressor is continuously operated for a period of time in each adjustment process, so that the operating frequency of the compressor is gradually adjusted under the condition of ensuring the stable flow rate of the refrigerant in the heat exchanger, the impact on the heat exchanger and the compressor caused by quickly and directly adjusting the operating frequency of the compressor to a rated value is avoided to the greatest extent, the service life of equipment is prolonged, and the stability of a system is improved. Wherein the number of buffer frequency values and the buffer duration maintained by each buffer frequency value are obtained by the difference between the current operating frequency of the compressor and the target frequency value.
As shown in connection with fig. 2, an embodiment of the present disclosure provides an apparatus for defrosting a water heater, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for defrosting a water heater of the above-described embodiments.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by running program instructions/modules stored in the memory 101, i.e., implements the method for defrosting a water heater in the above-described embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a water heater, comprising the device for defrosting the water heater.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for defrosting a water heater.
The storage medium may be a transitory storage medium or a non-transitory storage medium.
Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (9)
1. A method for defrosting a water heater comprising a compressor and an outdoor heat exchanger; characterized in that the method comprises:
acquiring a defrosting temperature value;
under the condition that the defrosting temperature value is larger than the temperature threshold value, controlling the compressor to operate in a first mode to defrost;
under the condition that the defrosting temperature value is smaller than or equal to the temperature threshold value, controlling the compressor to operate in a second mode to prevent freezing and defrosting;
wherein the anti-freezing defrosting comprises adjusting the operating frequency of the compressor according to the critical operating frequency; the critical operating frequency is used for representing the minimum operating frequency of the compressor required by the surface of the heat exchanger without icing;
the defrost temperature value includes one or more of an ambient temperature, a surface temperature of the outdoor heat exchanger, or a temperature of a refrigerant inlet side of the outdoor heat exchanger.
2. The method of claim 1, wherein controlling the compressor to operate in the second mode comprises:
according to the heat value P, the enthalpy change value delta h and the stroke volume V required by the heat exchanger for preventing freezing st Determining critical operating frequency f 0 ；
According to the critical operating frequency f 0 Adjusting an operating frequency of the compressor;
wherein the unit of the heat value P required by the heat exchanger for preventing freezing is kW; the unit of the enthalpy change value delta h is kJ/kg; stroke volume V st In cm 3 。
3. The method according to claim 2, characterized in that the heat value P, the enthalpy change value Δh and the stroke volume V are determined as a function of the heat exchanger anti-freeze requirement st Determining critical operating frequency f 0 Comprising:
calculation of
Wherein Δh is the enthalpy change value, and the unit is kJ/kg; v (V) st Is the stroke volume in cm 3 ；f 0 The critical operating frequency is expressed in Hz; p is the heat quantity value required by the heat exchanger for preventing freezing, and the unit is kW; the parameter 1000000 is the product of the specific volume value and the unit conversion quantity, and the unit is consistent with the specific volume value unit and is m 3 /kg。
4. The method according to claim 2, wherein the operating frequency f is based on the critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising:
at the operating frequency greater than the critical operating frequency f 0 Controlling the operating frequency of the compressor to decrease to less than the critical operating frequency f 0 ；
Controlling the operating frequency of the compressor to be continuously smaller than the critical operating frequency f 0 The duration of (2) reaches a first set duration.
5. The method according to claim 2, wherein the operating frequency f is based on the critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising:
at the operating frequency less than the critical operating frequency f 0 In the case of (a), controlling the operating frequency of the compressor to rise to said critical operating frequency f 0 。
6. The method according to any one of claims 2 to 5, characterized in that said operating frequency f is according to said critical operating frequency f 0 Adjusting an operating frequency of a compressor, comprising:
obtaining a plurality of buffer operation frequency values according to the difference value between the operation frequency and the critical operation frequency;
respectively obtaining the buffer operation time length corresponding to each buffer operation frequency value according to a preset corresponding relation;
and adjusting the operation frequency of the compressor to each buffer operation frequency value in sequence from small to large according to the buffer operation frequency value, and controlling the operation frequency of the compressor to continuously reach the corresponding buffer operation time length at the operation time length of each buffer operation frequency value.
7. An apparatus for defrosting a water heater comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for defrosting a water heater as claimed in any one of claims 1 to 6 when the program instructions are run.
8. A water heater comprising a compressor and an outdoor heat exchanger, further comprising the apparatus for defrosting a water heater of claim 7.
9. A storage medium storing program instructions which, when executed, perform the method for defrosting a water heater as claimed in any one of claims 1 to 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111007220.3A CN113847741B (en) | 2021-08-30 | 2021-08-30 | Method and device for defrosting water heater, water heater and storage medium |
| PCT/CN2022/093434 WO2023029594A1 (en) | 2021-08-30 | 2022-05-18 | Method and apparatus for defrosting water heater, water heater, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111007220.3A CN113847741B (en) | 2021-08-30 | 2021-08-30 | Method and device for defrosting water heater, water heater and storage medium |
Publications (2)
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| CN113847741B (en) * | 2021-08-30 | 2023-07-18 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
| CN114704936B (en) * | 2022-02-18 | 2024-04-09 | 青岛国创智能家电研究院有限公司 | Method and device for controlling direct current air conditioner and direct current air conditioner |
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| JPH10253205A (en) * | 1997-03-12 | 1998-09-25 | Matsushita Electric Ind Co Ltd | Freezing cycle control device |
| JP2012197956A (en) * | 2011-03-18 | 2012-10-18 | Mitsubishi Electric Corp | Heat pump type water heater |
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| CN102062504A (en) * | 2010-12-24 | 2011-05-18 | 中国扬子集团滁州扬子空调器有限公司 | Split type heat pump frequency conversion air conditioner which is defrosting nonstop machine and defrosting control method |
| CN106705489B (en) * | 2017-01-20 | 2019-05-24 | 上海理工大学 | In conjunction with the variable refrigerant volume system and its control method of air source heat pump hot water |
| CN107560218B (en) * | 2017-09-14 | 2020-04-10 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and defrosting control method thereof |
| CN107957156B (en) * | 2017-11-27 | 2020-03-24 | 青岛奥利凯中央空调有限公司 | Defrosting control method for air source heat pump unit |
| CN109974296A (en) * | 2017-12-28 | 2019-07-05 | 杭州先途电子有限公司 | A kind of air energy water heater and its Defrost method |
| JP2020085318A (en) * | 2018-11-22 | 2020-06-04 | ダイキン工業株式会社 | Heat pump device |
| CN110057046B (en) * | 2019-03-12 | 2021-12-17 | 青岛海尔空调电子有限公司 | Air conditioner and defrosting control method thereof |
| CN110173825A (en) * | 2019-05-31 | 2019-08-27 | 广东美的制冷设备有限公司 | Progress control method, control device, air conditioner and computer readable storage medium |
| CN110470011A (en) * | 2019-08-02 | 2019-11-19 | 青岛海尔空调器有限总公司 | Control method and device, air-conditioning for air-conditioner defrosting |
| CN110470016A (en) * | 2019-08-03 | 2019-11-19 | 青岛海尔空调器有限总公司 | Control method and device, air-conditioning for air-conditioner defrosting |
| CN110779164A (en) * | 2019-11-13 | 2020-02-11 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting control method and device, air conditioner and computer readable storage medium |
| CN110940055B (en) * | 2019-12-16 | 2021-10-22 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
| CN111964300B (en) * | 2020-08-17 | 2021-11-30 | 广东美的暖通设备有限公司 | Control method and device of air source heat pump equipment, equipment and readable storage medium |
| CN112032941A (en) * | 2020-08-25 | 2020-12-04 | 海信（山东）空调有限公司 | Control method of air conditioner |
| CN113847741B (en) * | 2021-08-30 | 2023-07-18 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10253205A (en) * | 1997-03-12 | 1998-09-25 | Matsushita Electric Ind Co Ltd | Freezing cycle control device |
| JP2012197956A (en) * | 2011-03-18 | 2012-10-18 | Mitsubishi Electric Corp | Heat pump type water heater |
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| WO2023029594A1 (en) | 2023-03-09 |
| CN113847741A (en) | 2021-12-28 |
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