CN115077102A - Method and device for determining initial opening degree of expansion valve and heat pump water heater - Google Patents
Method and device for determining initial opening degree of expansion valve and heat pump water heater Download PDFInfo
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- CN115077102A CN115077102A CN202110224368.6A CN202110224368A CN115077102A CN 115077102 A CN115077102 A CN 115077102A CN 202110224368 A CN202110224368 A CN 202110224368A CN 115077102 A CN115077102 A CN 115077102A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 212
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000012937 correction Methods 0.000 claims abstract description 110
- 238000005057 refrigeration Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 9
- 230000000875 corresponding effect Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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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
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The application relates to the technical field of household appliance control, and discloses a method for determining the initial opening degree of an expansion valve, which comprises the following steps: acquiring the ambient temperature around a compressor of a refrigeration system, the temperature of a coil of the refrigeration system and the water temperature of a water tank of a heat pump water heater; determining the reference opening degree of the expansion valve according to the ambient temperature; determining the water temperature correction opening degree of the expansion valve according to the water temperature of the water tank; determining the coil correction opening degree of the expansion valve according to the environment temperature and the coil temperature; and determining the initial opening of the expansion valve according to the reference opening, the water temperature correction opening and the coil correction opening. By the scheme, the initial opening degree of the expansion valve is effectively corrected, the initial opening degree of the expansion valve is determined more reasonably, the success probability of starting the compressor is improved, and a more accurate determination mode of the initial opening degree of the expansion valve is provided. The application also discloses a device for determining the initial opening degree of the expansion valve and a heat pump water heater.
Description
Technical Field
The present invention relates to the field of household appliance control technologies, and for example, to a method and an apparatus for determining an initial opening degree of an expansion valve, and a heat pump water heater.
Background
In the prior art, a refrigeration system of a heat pump water heater usually has throttling and pressure reducing effects on the refrigeration system by configuring an expansion valve, and the throttling and pressure reducing effects are controlled by adjusting the opening degree of the expansion valve. Therefore, it is necessary to adjust the opening degree of the expansion valve appropriately before the operation of the refrigeration system so as to stably operate the refrigeration system. The initial opening degree of the existing expansion valve is usually a fixed opening degree. For example, a 600-step expansion valve commonly used in a refrigeration system has an effective interval of 50-500 steps, and an initial opening degree of the expansion valve is usually preset to 300, i.e., a middle value of a step length, so that the initial opening degree is set to 300 steps to stably operate the refrigeration system.
However, although the scheme for setting the initial opening degree of the existing expansion valve can meet the system requirements under most normal working conditions, the performance is less ideal when the system operates under a special working condition or the pressure in the refrigeration system is still high after the system is just stopped. The reason for this is that when the working condition is special or the system pressure is large, the heat pump compressor is started with load, which easily causes the starting failure of the compressor; in addition, in order to ensure the initial stability of the starting, almost all control schemes require that the opening degree of the expansion valve is kept fixed and the frequency of the compressor is kept fixed after the starting. However, if a large pressure still exists in the refrigeration system, and the heat pump compressor still operates at the fixed frequency, the system pressure rises very quickly, and the opening degree of the expansion valve for throttling and depressurizing is set to a fixed value, so that the opening degree cannot be adjusted according to the current situation, and the exhaust pressure is likely to be suddenly accumulated and rise, thereby causing exhaust overheating protection or compressor frequency reduction.
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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for determining an initial opening degree of an expansion valve and a heat pump water heater, so as to provide a method for determining the initial opening degree of the expansion valve.
In some embodiments, the method comprises: acquiring the ambient temperature around a compressor of a refrigeration system, the coil temperature of the refrigeration system and the water temperature of a water tank of a heat pump water heater; determining the reference opening degree of the expansion valve according to the ambient temperature; determining the water temperature correction opening degree of the expansion valve according to the water temperature of the water tank; determining the coil correction opening degree of the expansion valve according to the environment temperature and the coil temperature; and determining the initial opening of the expansion valve according to the reference opening, the water temperature correction opening and the coil correction opening.
In some embodiments, the method comprises: determining a water temperature gear of the water temperature of the water tank according to the water temperature of the water tank; according to the water temperature gear, determining a water temperature correction coefficient and an initial opening offset of the gear; and determining the water temperature correction opening of the expansion valve according to the water temperature correction coefficient and the initial opening offset.
In some embodiments, the method comprises: temperature sensors are arranged at a water inlet and a water outlet of the heat pump water heater to acquire a first temperature acquired by the water inlet temperature sensor and a second temperature acquired by the water outlet temperature sensor; determining an average of the first temperature and the second temperature; and determining the water temperature gear of the water tank according to the average value of the first temperature and the second temperature.
In some embodiments, the method comprises: determining a temperature correction coefficient of the coil according to the ambient temperature; and determining the coil correction opening degree of the expansion valve according to the temperature of the coil and the temperature correction coefficient of the coil.
In some embodiments, the method comprises: acquiring the opening increment of an expansion valve of the heat pump water heater during the starting up and the interval duration between the last stopping of the heat pump water heater and the starting up; determining the cooling correction opening degree of the expansion valve according to the opening degree increment and the interval duration; the initial opening degree is corrected according to the cooling correction opening degree of the expansion valve.
In some embodiments, the method comprises: and when the interval duration is less than the preset duration, correcting the opening according to the cooling correction of the expansion valve, and correcting the initial opening.
In some embodiments, the method comprises: the expansion valve is controlled to operate at an initial opening degree and the compressor is started.
In some embodiments, the apparatus comprises: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is configured to acquire the ambient temperature around a compressor of a refrigeration system, the coil temperature of the refrigeration system and the water temperature of a water tank of a heat pump water heater; a reference opening degree determination module configured to determine a reference opening degree of the expansion valve according to the ambient temperature; a water temperature correction opening degree determination module configured to determine a water temperature correction opening degree of the expansion valve according to the water tank temperature; the coil correction opening determining module is configured to determine a coil correction opening of the expansion valve according to the environment temperature and the coil temperature; and the initial opening determining module is configured to determine the initial opening of the expansion valve according to the reference opening, the water temperature correction opening and the coil correction opening.
In some embodiments, the apparatus comprises: comprising a processor and a memory storing program instructions, the processor being configured, upon execution of the program instructions, to perform the aforementioned determination method for an initial opening degree of an expansion valve.
In some embodiments, the heat pump water heater comprises: and determining means for an initial opening degree of the expansion valve.
The method and the device for determining the initial opening degree of the expansion valve and the heat pump water heater provided by the embodiment of the disclosure can realize the following technical effects: the ambient temperature around the compressor of the refrigeration system, the temperature of the coil pipe and the water temperature of a water tank of the heat pump water heater are obtained; the method and the device can determine the reference opening of the expansion valve, the water temperature correction opening of the expansion valve and the coil correction opening of the expansion valve, effectively correct the initial opening of the expansion valve, more reasonably determine the initial opening of the expansion valve, facilitate the improvement of the success rate of starting the compressor, and provide a more accurate determination mode of the initial opening of the expansion valve.
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 in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic diagram of a method for determining an initial opening degree of an expansion valve according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a device for determining an initial opening degree of an expansion valve according to an embodiment of the disclosure;
fig. 3 is a schematic diagram of another device for determining an initial opening degree of an expansion valve according to an embodiment of the disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. 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 be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.
In practical application, after the heat pump water heater is turned off, the running frequency of the compressor is zero, and after the heat pump water heater is turned on again, the interval duration between the last time of turning off the compressor and the current time of turning on the compressor is acquired, and the cooling correction opening of the compressor is determined. And acquiring the ambient temperature around the compressor, the coil temperature of the refrigerating system and the water temperature of a water tank of the heat pump water heater. And determining the reference opening degree of the expansion valve according to the ambient temperature. And determining the water temperature correction opening degree of the expansion valve according to the water temperature of the water tank. And determining the initial opening of the expansion valve according to the reference opening, the water temperature correction opening, the coil pipe correction opening and the cooling correction opening when the interval duration between the last compressor shutdown time and the current compressor startup time is less than the preset interval duration.
Fig. 1 is a schematic diagram of a method for determining an initial opening degree of an expansion valve according to an embodiment of the present disclosure, and in conjunction with fig. 1, the embodiment of the present disclosure provides a method for determining an initial opening degree of an expansion valve, including:
and S11, acquiring the ambient temperature around the compressor of the refrigeration system, the coil temperature of the refrigeration system and the water temperature of the water tank of the heat pump water heater.
S12, the reference opening degree of the expansion valve is determined based on the ambient temperature.
And S13, determining the water temperature correction opening degree of the expansion valve according to the water temperature of the water tank.
And S14, determining the coil correction opening degree of the expansion valve according to the environment temperature and the coil temperature.
And S15, determining the initial opening degree of the expansion valve according to the reference opening degree, the water temperature correction opening degree and the coil correction opening degree.
In the prior art, because the water temperature in the hot water tank of the heat pump water heater product is usually above 50 ℃, the heat pump water heater can be started to heat when the hot water temperature is lower than 50 ℃, and can be stopped when the hot water temperature is higher than 55 ℃, and then when a user continuously uses water in a summer scene, the heat pump water heater can be frequently started and stopped because of the habit of the user. If only ambient temperature is considered, and system pressure and system cooling are not considered, there is a large system pressure at each startup, which reduces startup success and overall system efficiency. Therefore, the ambient temperature, the tank temperature, and the coil temperature need to be considered to reduce the system pressure. According to the scheme, the initial opening degree of the expansion valve can be effectively determined through the reference opening degree, the water temperature correction opening degree and the coil pipe correction opening degree. The system pressure is reduced, and the starting success rate of the compressor and the overall efficiency of the system are improved.
In step 11, the ambient temperature around the compressor of the refrigeration system, the coil temperature of the refrigeration system, and the water temperature in the water tank of the heat pump water heater may be obtained.
In this scheme, an ambient temperature sensor may be disposed on the heat pump water heater, and the ambient temperature around the compressor may be obtained by the ambient temperature sensor. A temperature sensor can be arranged on the heat pump water heater to acquire the water temperature of the water tank. A coil temperature sensor can be arranged on the heat pump water heater and used for acquiring the coil temperature of the refrigerating system. According to the scheme, accurate temperature data can be acquired through the sensor, and accurate temperature data is provided for adjusting the initial opening degree of the expansion valve.
In step 12, a reference opening degree of the expansion valve is determined based on the ambient temperature.
In this embodiment, as shown in table 1, specifically, the reference opening degree of the expansion valve may be determined according to the ambient temperature obtained by the ambient temperature sensor and the temperature gear at which the ambient temperature is located, and then according to the temperature gear. For example, if the acquired ambient temperature Ta is 38 ℃, the gear at which 38 ℃ is located is determined to be 45 ℃ or more and Ta > 37 ℃, and the reference opening degree of the expansion valve is determined to be 300 steps. According to the scheme, the accurate reference opening degree of the expansion valve can be obtained, and the use requirements of users are met.
| Ambient temperature Ta | Reference opening degree P of expansion valve |
| Ta＞45℃ | 340 |
| 45℃≥Ta＞37℃ | 300 |
| 37℃≥Ta＞26℃ | 280 |
| 26℃≥Ta＞17℃ | 250 |
| 17℃≥Ta＞10℃ | 220 |
| 10℃≥Ta＞4℃ | 190 |
| 4℃≥Ta＞-4℃ | 140 |
| -4℃≥Ta | 120 |
TABLE 1
In step 13, the water temperature correction opening degree of the expansion valve is determined based on the tank water temperature.
In the scheme, the water temperature of the water tank of the heat pump water heater can be obtained according to the water temperature sensor, and the water temperature correction parameter of the expansion valve is determined according to the water temperature of the water tank. With this scheme, can obtain accurate temperature correction parameter according to the water tank temperature to reduce the pressure influence of water tank temperature to refrigerating system.
In step 14, a coil correction opening degree of the expansion valve may be determined according to the ambient temperature and the coil temperature.
In this scheme, can confirm the coil pipe correction aperture of expansion valve according to the coil pipe temperature that coil pipe temperature sensor gathered and the ambient temperature that ambient temperature sensor obtained. According to the scheme, the accurate coil temperature correction parameter can be determined through the ambient temperature and the coil temperature, so that the influence of the coil temperature on the system pressure is reduced.
In step 15, an initial opening degree of the expansion valve may be determined based on the reference opening degree, the water temperature correction opening degree, and the coil correction opening degree.
In this embodiment, the initial opening degree of the expansion valve may be determined based on the reference opening degree, the water temperature correction opening degree, and the coil correction opening degree. Specifically, the initial opening degree P of the expansion valve may be determined by:
P＝P base of +P Temperature of water +P Coil pipe
In the scheme, the ambient temperature around the compressor of the refrigeration system, the temperature of the coil pipe and the water temperature of the water tank of the heat pump water heater are obtained; the method and the device can determine the reference opening of the expansion valve, the water temperature correction opening of the expansion valve and the coil correction opening of the expansion valve, effectively correct the initial opening of the expansion valve, more reasonably determine the initial opening of the expansion valve, facilitate the improvement of the success rate of starting the compressor, and provide a more accurate determination mode of the initial opening of the expansion valve.
Optionally, in order to determine the water temperature correction parameter of the expansion valve, in the present embodiment, the water temperature gear at which the water temperature of the water tank is located may be determined according to the water temperature of the water tank; determining a water temperature correction coefficient and an initial opening offset of the gear according to the water temperature gear; therefore, the water temperature correction opening of the expansion valve is determined according to the water temperature correction coefficient and the initial opening offset.
In the present embodiment, as shown in table 2, if the acquired tank water temperature is 42 ℃, it is determined that the water temperature stage corresponding to the tank water temperature is 45 ℃ > Tc > 30 ℃, and it is determined that the water temperature correction coefficient Kc corresponding to the stage is 0.8 and the initial opening offset amount is 8.
| Water tank temperature gear Tc0 | Water temperature correction coefficient of electronic expansion valve |
| Tc＞45℃ | Kc＝2.0Kb＝20 |
| 45℃≥Tc＞30℃ | Kc＝0.8Kb＝8 |
| 30℃≥Tc＞10℃ | Kc＝0.4Kb＝0 |
| 10℃≥Tc | Kc＝0Kb＝0 |
TABLE 2
In the scheme, after the water temperature correction coefficient and the initial opening offset are determined, the water temperature correction coefficient and the initial opening offset can be determined according to P Temperature of water ＝K C *(T C -T C0 )+K b Determining the water temperature correction opening, T in the scheme C0 Is the lowest value of the temperature gear of the water tank. For example, if the acquired water temperature of the water tank is 51 ℃, the corresponding water temperature gear is T C The temperature is higher than 45 ℃, the water temperature correction coefficient Kc is determined to be 2, and the initial opening offset K is determined b 20, and the lowest value T of the temperature gear of the water tank C0 45, and determining the water temperature correction opening P Water temperature 2.0 (51-45) +20 ═ 32. With the scheme, accurate water can be obtained according to the water temperature of the water tankAnd temperature correction parameters are adopted to reduce the pressure influence of the water temperature of the water tank on the refrigerating system.
Optionally, in order to make the acquired water temperature of the water tank more accurate, in the scheme, if the water inlet and the water outlet of the heat pump water heater are both provided with temperature sensors, a first temperature acquired by the water inlet temperature sensor and a second temperature acquired by the water outlet temperature sensor are acquired; determining an average of the first temperature and the second temperature; and determining the water temperature gear of the water tank according to the average value of the first temperature and the second temperature.
In the scheme, if the water inlet and the water outlet of the heat pump water heater are both provided with the temperature sensors, the first temperature of the water inlet and the second temperature of the water outlet can be respectively obtained, and the average value of the first temperature and the second temperature is determined as the water temperature of the water tank. And further, determining the water temperature gear of the water tank according to the average value, thereby determining the water temperature correction opening degree of the expansion valve. According to the scheme, accurate temperature data can be obtained, so that the accuracy of the water temperature correction opening degree of the expansion valve is improved.
Optionally, in order to determine the corrected opening degree of the coil, in this embodiment, the temperature correction coefficient of the coil may be determined according to the ambient temperature; and determining the coil correction opening degree of the expansion valve according to the temperature of the coil and the temperature correction coefficient of the coil.
In this scheme, P can be passed Coil pipe ＝K e *((T e -T e0 )+K a *(T a -20)) the coil correction opening of the expansion valve is obtained. Wherein, K e As a correction factor for coil temperature, T e Is coil temperature, T e0 The coil temperature is 6 ℃ under the standard working condition, and the standard working condition is the working condition that the environmental temperature is 20 ℃. K a The correction parameter of the ambient temperature to the coil temperature is 0.2-0.3. T is a Is ambient temperature.
In one example, K e And under the maximum working condition, the coil temperature correction coefficient is 2.41, wherein the maximum working condition is the working condition that the ambient temperature is 43 ℃. Accordingly, the coil correction opening is 2.41 [ ((T) ] e -6)+0.2*(T a -20)) and further by the obtained coil temperature T e And the ambient temperature T a And determining the corrected opening of the coil.
With this scheme, can confirm accurate coil pipe temperature correction parameter through ambient temperature and coil pipe temperature, avoid reducing the influence of coil pipe temperature to system pressure.
Optionally, in order to avoid the pressure influence when the system is stopped and restarted, in the scheme, the opening increment of the expansion valve of the heat pump water heater during starting is set, and the interval duration between the last stopping of the heat pump water heater and the starting of the heat pump water heater at this time is calculated; determining the cooling correction opening degree of the expansion valve according to the opening degree increment and the interval duration; the initial opening degree is corrected according to the cooling correction opening degree of the expansion valve.
In the scheme, after the compressor is shut down and restarted, in order to avoid starting failure caused by overlarge exhaust pressure, the opening increment of the expansion valve of the heat pump water heater during restarting after shutting down can be set, under general conditions, the increment is generally more than or equal to 100, and the opening increment can be set according to P Cooling down ＝P 0 *(0.75 t ) And determining a cooling correction opening degree of the expansion valve. Wherein, P 0 The opening increment of the expansion valve is started up after the compressor is stopped last time, and t represents the time interval from the last shutdown of the heat pump water heater to the restart of the heat pump water heater, and the unit is minutes. In the technical solution provided in the embodiment of the present disclosure, 0.75 represents a base number positively correlated to the size of the system capacity, that is, when the system capacity is 200L, the corresponding base number is 0.75. In this embodiment, the larger the system capacity, the slower the pressure drop rate, and correspondingly, the higher the base value. Furthermore, when the value of t reaches 8 minutes, the pressure effect of system shutdown and restart does not need to be considered. According to the scheme, the correction opening required by system cooling can be obtained, so that the pressure influence when the system is stopped and restarted can be reduced.
Optionally, when the interval duration is less than the preset duration, the initial opening degree is corrected according to the cooling correction opening degree of the expansion valve.
In the scheme, if the interval duration is longer than the preset duration, the system is not affected by pressure when being stopped and restarted. And when the interval duration is less than the preset duration, the cooling correction opening degree of the system needs to be considered and determined. Specifically, the preset duration may be set in advance according to the ambient temperature and the system capacity. For example, the preset time period may be set to 5 minutes. According to the scheme, the trigger condition for correcting the initial opening according to the cooling correction opening can be determined, so that the correction flow can be effectively simplified, and the accuracy of the determination process of the initial opening of the expansion valve is improved.
Alternatively, after determining the initial opening degree of the expansion valve, the expansion valve is controlled to operate at the initial opening degree and the compressor is started.
With the scheme, after the initial opening degree of the expansion valve is determined, the expansion valve is controlled to operate at the initial opening degree, the compressor is started, and the stable operation of the system is ensured.
Referring to fig. 2, an apparatus for determining an initial opening degree of an expansion valve according to an embodiment of the present disclosure includes an obtaining module 21, a reference opening degree determining module 22, a water temperature correction opening degree determining module 23, a coil correction opening degree determining module 24, and an initial opening degree determining module 25. The acquisition module 21 is configured to acquire an ambient temperature around a compressor of the refrigeration system, a coil temperature of the refrigeration system, and a water temperature of a water tank of the heat pump water heater; the reference opening degree determination module 22 is configured to determine a reference opening degree of the expansion valve according to the ambient temperature; the water temperature correction opening degree determination module 23 is configured to determine a water temperature correction opening degree of the expansion valve according to the tank water temperature; the coil correction opening determination module 24 is configured to determine a coil correction opening of the expansion valve according to the ambient temperature and the coil temperature; the initial opening degree determination module 25 is configured to determine an initial opening degree of the expansion valve based on the reference opening degree, the water temperature correction opening degree, and the coil correction opening degree.
By adopting the device for determining the initial opening degree of the expansion valve, which is provided by the embodiment of the disclosure, the ambient temperature on the peripheral side of the compressor of the refrigeration system, the temperature of the coil pipe and the water temperature of the water tank of the heat pump water heater are obtained; the method and the device can determine the reference opening of the expansion valve, the water temperature correction opening of the expansion valve and the coil correction opening of the expansion valve, effectively correct the initial opening of the expansion valve, more reasonably determine the initial opening of the expansion valve, facilitate the improvement of the success rate of starting the compressor, and provide a more accurate determination mode of the initial opening of the expansion valve.
As shown in fig. 3, an embodiment of the present disclosure provides a determining device for an initial opening degree of an expansion valve, which includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include 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 a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to execute the determination method for the initial opening degree of the expansion valve of the above-described embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, 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 executing program instructions/modules stored in the memory 101, that is, implements the method for determining the initial opening degree of the expansion valve in the above-described embodiment.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, 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 heat pump water heater, which comprises the above determining device for the initial opening degree of the expansion valve.
Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for determining an initial opening degree of an expansion valve.
An embodiment of the present disclosure provides a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-mentioned method for determining an initial opening degree of an expansion valve.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify 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. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "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, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would 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 may depend 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 disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart 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 disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for determining the initial opening degree of an expansion valve is characterized by being applied to a refrigeration system of a heat pump water heater, and the method comprises the following steps:
acquiring the ambient temperature around a compressor of the refrigeration system, the coil temperature of the refrigeration system and the water temperature of a water tank of the heat pump water heater;
determining the reference opening degree of the expansion valve according to the environment temperature;
determining the water temperature correction opening degree of the expansion valve according to the water temperature of the water tank;
determining the coil correction opening degree of the expansion valve according to the environment temperature and the coil temperature;
and determining the initial opening of the expansion valve according to the reference opening, the water temperature correction opening and the coil pipe correction opening.
2. The method of claim 1, wherein said determining a water temperature correction opening degree of the expansion valve based on the tank water temperature comprises:
determining a water temperature gear of the water tank according to the water temperature of the water tank;
according to the water temperature gear, determining a water temperature correction coefficient and an initial opening offset of the gear;
and determining the water temperature correction opening of the expansion valve according to the water temperature correction coefficient and the initial opening offset.
3. The method of claim 2, wherein if the water inlet and outlet of the heat pump water heater are configured with temperature sensors, the method further comprises:
acquiring a first temperature acquired by a water inlet temperature sensor and a second temperature acquired by a water outlet temperature sensor;
determining an average of the first temperature and the second temperature;
the step of determining the water temperature gear of the water tank according to the water temperature of the water tank comprises the following steps:
and determining a water temperature gear of the water tank according to the average value of the first temperature and the second temperature.
4. The method of claim 1, wherein determining a coil correction opening of the expansion valve based on the ambient temperature and the coil temperature comprises:
determining a temperature correction coefficient of the coil according to the environment temperature;
and determining the coil correction opening degree of the expansion valve according to the temperature of the coil and the temperature correction coefficient of the coil.
5. The method of claim 1, further comprising:
acquiring the opening increment of an expansion valve of the heat pump water heater during the starting up and the interval duration between the last stopping of the heat pump water heater and the starting up;
determining the cooling correction opening degree of the expansion valve according to the opening degree increment and the interval duration;
and correcting the initial opening according to the cooling correction opening of the expansion valve.
6. The method of claim 5, further comprising:
and correcting the initial opening according to the cooling correction opening of the expansion valve when the interval duration is less than the preset duration.
7. The method of claim 1, wherein after determining the initial opening degree of the expansion valve, the method further comprises:
controlling the expansion valve to operate at an initial opening degree and starting the compressor.
8. An apparatus for determining an initial opening degree of an expansion valve, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is configured to acquire the ambient temperature around a compressor of the refrigeration system, the coil temperature of the refrigeration system and the water temperature of a water tank of the heat pump water heater;
a reference opening degree determination module configured to determine a reference opening degree of the expansion valve according to the ambient temperature;
a water temperature correction opening degree determination module configured to determine a water temperature correction opening degree of the expansion valve according to the tank water temperature;
a coil correction opening determination module configured to determine a coil correction opening of the expansion valve according to the ambient temperature and the coil temperature;
and the initial opening determining module is configured to determine the initial opening of the expansion valve according to the reference opening, the water temperature correction opening and the coil correction opening.
9. A determination device for an initial opening degree of an expansion valve, comprising a processor and a memory in which program instructions are stored, characterized in that the processor is configured to carry out the determination method for an initial opening degree of an expansion valve according to any one of claims 1 to 7 when executing the program instructions.
10. A heat pump water heater comprising the determining means for the initial opening degree of the expansion valve according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224368.6A CN115077102A (en) | 2021-03-01 | 2021-03-01 | Method and device for determining initial opening degree of expansion valve and heat pump water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224368.6A CN115077102A (en) | 2021-03-01 | 2021-03-01 | Method and device for determining initial opening degree of expansion valve and heat pump water heater |
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| CN115077102A true CN115077102A (en) | 2022-09-20 |
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| CN202110224368.6A Pending CN115077102A (en) | 2021-03-01 | 2021-03-01 | Method and device for determining initial opening degree of expansion valve and heat pump water heater |
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| Country | Link |
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| CN (1) | CN115077102A (en) |
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- 2021-03-01 CN CN202110224368.6A patent/CN115077102A/en active Pending
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