Control method and device for space energy water heater, space energy water heater

Abstract

The present application relates to the technical field of water heaters, and discloses a control method for a space energy water heater, including: obtaining the current time, the water tank inlet temperature, and the irradiation value of the heat collecting evaporator; when the current time, the water tank inlet temperature, and the irradiation value meet the first preset condition, controlling the heat pump to start. By comprehensively considering the current time, the water tank inlet temperature, and the irradiation value, the heat pump is controlled. In this way, without affecting the normal use of hot water by users, space energy such as solar radiation is fully utilized, which can play a good role in saving electricity. The present application also discloses a control device for a space energy water heater and a space energy water heater.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, for example, to a control method and device for a space energy water heater, and a space energy water heater. Background Art

[0002] The space energy water heater is a solar water heater water tank combined with an air source heat pump condenser. A heat exchange device is installed in a vertical or horizontal water tank and connected to the heat pump working medium circulation pipeline. It is mainly composed of a heat collection evaporator, a compressor, a condenser, a thermal expansion valve water tank, etc. In the prior art, a target heating temperature is set for the water temperature in the water tank of the space energy water heater. When the water temperature in the water tank is lower than the target heating temperature, the heat pump (compressor) is started for heating; when the water temperature in the water tank is heated to the target heating temperature, the heating is stopped.

[0003] In the process of implementing the embodiments of the present disclosure, it was found that there are at least the following problems in the related technology: when the water temperature in the water tank of the space energy water heater is lower than the target heating temperature, the heat pump is started for heating. However, during the heat pump heating period, it is likely that the solar radiation is not good and the ambient temperature is high. Therefore, it is impossible to achieve optimal control of the energy utilization of the space energy water heater. Summary of the invention

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The disclosed embodiments provide a control method and device for a space energy water heater, and a space energy water heater, so as to solve the problem that when the water temperature in the water tank of the current space energy water heater is lower than the target heating temperature, the heat pump is started for heating, and the optimal control of the energy utilization of the space energy water heater cannot be achieved.

[0006] In some embodiments, a control method for a space energy water heater includes:

[0007] Get the current time, water tank inlet temperature and irradiation value of the collector evaporator;

[0008] When the current time, the water tank inlet temperature and the irradiance value meet the first preset condition, the heat pump is controlled to start.

[0009] In some embodiments, a control device for a space energy water heater includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned control method for the space energy water heater when executing the program instructions.

[0010] In some embodiments, the space energy water heater includes the above-mentioned control device for the space energy water heater.

[0011] The control method and device for a space energy water heater and the space energy water heater provided in the embodiments of the present disclosure can achieve the following technical effects:

[0012] The current time, water tank inlet temperature and irradiation value of the heat collector evaporator are obtained, and the heat pump is controlled by comprehensively considering the current time, water tank inlet temperature and irradiation value, which are the heat pump startup factors. In this way, without affecting the normal hot water use of users, space energy such as solar radiation is fully utilized, which can play a good role in saving electricity.

[0013] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0015] Figure 1 is a schematic diagram of a control method for a space energy water heater provided by an embodiment of the present disclosure;

[0016] Figure 2 is a schematic diagram of another control method for a space energy water heater provided by an embodiment of the present disclosure;

[0017] Figure 3 is a schematic diagram of another control method for a space energy water heater provided by an embodiment of the present disclosure;

[0018] Figure 4 It is a schematic diagram of a control device for a space energy water heater provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0020] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0021] Unless otherwise specified, the term "plurality" means two or more. The character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship between objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B.

[0022] In the disclosed embodiment, the space energy water heater includes components such as a heat collecting evaporator, a compressor (heat pump), a four-way valve, a condensing water storage tank, and an electronic expansion valve, which are connected in sequence through a refrigerant pipeline, wherein the heat collecting evaporator includes an evaporator and a heat collector arranged on the evaporator, and the condensing water storage tank includes a water storage tank and a condenser surrounding the water storage tank. The heat collecting evaporator is arranged outside the water tank of the space energy water heater, and the compressor, the four-way valve, the condensing water storage tank, and the electronic expansion valve are arranged inside the water tank. On sunny days, the heat collector absorbs solar radiation energy and directly heats the cold water in the water storage tank in a microcirculation manner; when the temperature detection device in the water storage tank detects that the water temperature in the water storage tank does not reach the set value, the heat pump starts to work and exchanges heat with the water in the water storage tank through the mixed working fluid, and finally keeps the water temperature stable.

[0023] When the heat pump is working, the collector absorbs solar radiation and heats the evaporator, causing the refrigerant in the evaporator to absorb heat and evaporate; the evaporated refrigerant is sucked into the heat pump and compressed into a high-temperature and high-pressure gas, and then discharged into the condenser to release heat, and the water in the water tank exchanges heat with the condenser to rise in temperature; the refrigerant in the condenser is throttled by the electronic expansion valve and flows back into the evaporator, thus completing a working cycle.

[0024] Combination Figure 1 As shown, the embodiment of the present disclosure provides a control method for a space energy water heater, comprising the following steps:

[0025] S101: Obtain the current time, the water tank inlet temperature and the radiation value of the heat collection evaporator.

[0026] In practical applications, the water tank inlet temperature can be the water temperature at the water tank inlet or the inner surface temperature at the water tank inlet. The water tank inlet temperature can be detected by a temperature sensor. The irradiation value of the collector evaporator is used to reflect the solar radiation energy absorbed by the collector. As time goes by, the irradiation value of the collector evaporator gradually increases.

[0027] S102: When the current time, the water tank inlet temperature and the irradiance value meet a first preset condition, the heat pump is controlled to start.

[0028] Optionally, the first preset condition includes:

[0029] t<t0,T<T0,and W>W0

[0030] Among them, t is the current time, t0 is the preset time, T is the water tank inlet temperature, T0 is the preset water tank inlet temperature, W is the irradiation value, and W0 is the preset irradiation value.

[0031] Here, the preset time t0 is the latest start time, which is determined according to the heating rate of the heat pump without sunlight assistance and the time when the user is expected to use water. For example, if the user is expected to use water at 6 pm, when the heating rate of the heat pump without sunlight assistance is large, the water tank inlet temperature can be raised to the preset water inlet temperature in half an hour, and the preset time t0 is 5:30 pm; when the heating rate of the heat pump without sunlight assistance is small, it takes one hour to raise the water tank inlet temperature to the preset water inlet temperature, and the preset time t0 is 5 pm. The preset water tank inlet temperature can be set by the user, and it can meet the daily water temperature.

[0032] Optionally, the preset irradiance value is determined according to the ambient temperature and the temperature difference between the water tank inlet temperature and the ambient temperature. e As well as the water tank inlet temperature T and the ambient temperature T e After the temperature difference ΔT is determined, the temperature corresponding to the ambient temperature T can be determined by looking up the corresponding relationship table. e , the preset irradiance value W0 (unit: Watt) corresponding to the temperature difference ΔT, as shown in Table 1 below:

[0033] Table 1: Correspondence table

[0034]

[0035] According to Table 1 above, the preset irradiance value is positively correlated with the ambient temperature and negatively correlated with the temperature difference. The higher the ambient temperature, the higher the water temperature and the faster the heat pump heating rate. Therefore, the larger the preset irradiance value, the later the heat pump starts. The smaller the temperature difference, the less heat is required to heat the water in the water tank to the preset water tank inlet temperature, and the shorter the heating time. Therefore, the larger the preset irradiance value, the later the heat pump starts. In this way, space energy such as solar radiation can be fully utilized to save electricity.

[0036] By adopting the control method for space energy water heater provided by the embodiment of the present disclosure, the current time, the water tank inlet temperature and the radiation value of the heat collecting evaporator are obtained, and the heat pump is controlled by comprehensively considering the current time, the water tank inlet temperature and the radiation value, which are the heat pump start-up factors. In this way, without affecting the normal use of hot water by users, full use of space energy such as solar radiation can be made, which can play a good role in saving electricity.

[0037] In some embodiments, in combination Figure 2 As shown, obtaining the irradiance value includes the following steps:

[0038] S201: Obtaining a plurality of irradiance values ​​of a heat collection evaporator detected within a preset time period.

[0039] The preset time period is a preset time period before the current moment (for example, the previous 10 minutes). When the sunlight suddenly becomes strong and then returns to normal, the irradiance value of the collector evaporator will suddenly soar. When the radiation value is greater than the preset radiation value, the heat pump starts to work. According to the actual light conditions, delaying the start of the heat pump for a period of time can also meet the heating demand of the water temperature of the water storage tank, so starting the heat pump in advance causes a waste of electric energy. Therefore, in order to reduce the impact of accidental meteorological changes on the timing of heat pump start-up, multiple irradiance values ​​are collected within the preset time period, and data processing is performed on the multiple irradiance values ​​to obtain the final irradiance value, thereby reducing the randomness of the change in the irradiance value. While meeting the heating demand of the water temperature of the water storage tank, it can better save electricity and energy.

[0040] S202: Perform data processing on a plurality of irradiance values ​​to obtain processed irradiance values.

[0041] Optionally, data processing is performed on the plurality of irradiance values ​​to obtain processed irradiance values, including:

[0042]

[0043] in, is the processed irradiance value, n is the number of irradiance values ​​detected within the preset time period, W n is the nth irradiance value of the collector evaporator detected within the preset time period, α n W n The weighting coefficient of n =1.

[0044] In this way, multiple irradiance values ​​detected within a preset time period are weighted averaged to obtain a weighted average irradiance value (processed irradiance value), and the weighted average irradiance value is used as the final irradiance value, which can reduce the randomness of irradiance value changes.

[0045] Optionally, α nPositively correlated with n, that is, as the value of n increases, α n For example, when n = 5, α1 = 0.1, α n =0.15,α n =0.2,α n =0.25,α n =0.3. n is the nth irradiance value W detected within the preset time period n The weighting coefficient, α n Positively correlated with n, indicating that W n The closer the detection time is to the current time, the greater the weighting coefficient is. In this way, the weighted average irradiance value can better represent the irradiance value of the collector evaporator at the current time.

[0046] S203: Using the processed irradiance value as the irradiance value.

[0047] Acquiring multiple irradiation values ​​of the solar collector evaporator within a preset time period, and performing data processing on the multiple irradiation values ​​to obtain a final irradiation value, the randomness of irradiation value changes is reduced, and while meeting the heating requirements of the water temperature of the water storage tank, electric energy can be better saved and energy can be conserved; at the same time, compared with obtaining a single irradiation value of the solar collector evaporator, performing data processing on multiple irradiation values ​​to obtain the final irradiation value can reduce the impact of irradiation value detection errors of the solar collector evaporator on the final irradiation value.

[0048] In some embodiments, the control method for the space energy water heater further includes: controlling the heat pump to turn on when the current time and the water tank inlet temperature meet a second preset condition.

[0049] Optionally, the second preset condition includes:

[0050] t≥t0, and T<T0

[0051] Among them, t is the current time, t0 is the preset time, T is the water tank inlet temperature, and T0 is the preset water tank inlet temperature.

[0052] When the current time exceeds the preset time, when the water tank inlet temperature is lower than the preset water tank inlet temperature, the heat pump is started for heating to ensure the user's hot water use, which reflects the principle of user first and improves the user experience of the space energy water heater.

[0053] In some embodiments, in combination Figure 3 As shown, the control method for the space energy water heater includes the following steps:

[0054] S301: Obtain the current time, the water tank inlet temperature and the radiation value of the heat collecting evaporator.

[0055] S302: Determine whether the current time, the water tank inlet temperature and the irradiation value meet the first preset condition.

[0056] S303: When the current time, the water tank inlet temperature and the irradiance value meet the first preset condition, control the heat pump to start.

[0057] S304: When the current time, the water tank inlet temperature and the irradiation value do not satisfy the first preset condition, determine whether the current time and the water tank inlet temperature satisfy the second preset condition.

[0058] S305: When the current time and the water tank inlet temperature meet the second preset condition, control the heat pump to start.

[0059] In the disclosed embodiment, when the current time has not passed the preset time, when the water tank inlet temperature is lower than the preset water tank inlet temperature, the start time of the heat pump is determined according to the radiation value of the heat collector evaporator; when the current time has exceeded the preset time, when the water tank inlet temperature is lower than the preset water tank inlet temperature, the heat pump is started for heating. In this way, while ensuring the normal use of hot water for users, the start time of the heat pump is postponed, and green space energy such as solar radiation is fully utilized, which can better save electricity.

[0060] Combination Figure 4 The embodiment of the present disclosure provides a control device for a space energy water heater, including a processor 40 and a memory 41, and may also include a communication interface 42 and a bus 43. The processor 40, the communication interface 42, and the memory 41 can communicate with each other through the bus 43. The communication interface 42 can be used for information transmission. The processor 40 can call the logic instructions in the memory 41 to execute the control method for the space energy water heater of the above embodiment.

[0061] In addition, the logic instructions in the memory 41 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0062] The memory 41 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 40 executes the function application and data processing by running the program instructions / modules stored in the memory 41, that is, the control method for the space energy water heater in the above method embodiment is implemented.

[0063] The memory 41 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 41 may include a high-speed random access memory and may also include a non-volatile memory.

[0064] An embodiment of the present disclosure provides a space energy water heater, comprising the above-mentioned control device for the space energy water heater.

[0065] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for a space energy water heater.

[0066] An embodiment of the present disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the above-mentioned control method for a space energy water heater.

[0067] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0068] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling 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 the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0069] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, individual components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. The scope of the embodiments of the present disclosure includes the entire scope of the claims, and all available equivalents of the claims. When used in this application, although the terms "first", "second", etc. may be used in this application to describe each element, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without changing the meaning of the description, the first element can be called the second element, and similarly, the second element can be called the first element, as long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first element and the second element are both elements, but may not be the same element. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates, the singular forms "a", "an" and "the" are intended to include the plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method or device including the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0070] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0071] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0072] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a space energy water heater, characterized in that: Including: Obtain the current time, the temperature of the water inlet of the water tank, and the irradiation value of the heat collection evaporator; When the current time, the temperature of the water inlet of the water tank, and the irradiation value meet the first preset condition, control the heat pump to turn on; The first preset condition includes: t < t0, T < T0, and W > W0 Wherein, t is the current time, t0 is the preset time, T is the temperature of the water inlet of the water tank, T0 is the preset temperature of the water inlet of the water tank, W is the irradiation value, W0 is the preset irradiation value, and the preset time t0 is the latest start time, which is determined according to the heating rate of the heat pump without sunlight assistance and the time when the user expects to use water; The preset irradiation value is determined according to the ambient temperature and the temperature difference between the temperature of the water inlet of the water tank and the ambient temperature. The preset irradiation value is positively correlated with the ambient temperature and negatively correlated with the temperature difference.

2. The control method according to claim 1, characterized in that: Obtaining the irradiation value includes: Obtain multiple irradiation values of the heat collection evaporator detected within a preset time period; Perform data processing on the multiple irradiation values to obtain a processed irradiation value; Use the processed irradiation value as the irradiation value.

3. The control method according to claim 2, characterized in that: The performing data processing on the multiple irradiation values to obtain a processed irradiation value includes: in, is the processed irradiance value, n is the number of irradiance values ​​detected within the preset time period, is the nth irradiance value of the collector evaporator detected within the preset time period, for The weighting coefficient of .

4. The control method according to any one of claims 1 to 3, characterized in that: It further includes: When the current time and the temperature of the water inlet of the water tank meet the second preset condition, control the heat pump to turn on.

5. The control method according to claim 4, characterized in that: The second preset condition includes: in, is the current time, is the preset time, T is the water inlet temperature of the water tank, It is the preset water tank inlet temperature.

6. A control device for a space energy water heater, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for the space energy water heater according to any one of claims 1 to 5 when executing the program instructions.

7. A space energy water heater, characterized in that: Including the control device for the space energy water heater according to claim 6.

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