Control method and control device for a heat pump system, storage medium and heat pump system

Abstract

The application provides a control method, a control device, a storage medium and a heat pump system, wherein the control method comprises the following steps: obtaining a real-time outlet water temperature T2 of the water tank and a real-time outlet water temperature T1 of the water supplement pipe; comparing the T2 and a user set temperature Ts and the T1 and the user set temperature Ts respectively; when T2 < Ts, adjusting the operation power of the compressor and / or the pumping flow of the water pump according to the operation mode of the heat pump system; or when T1 = Ts, controlling the water pump to stop operating. Through the comparison between the real-time temperature T2 of the water in the water tank and the user set temperature Ts, the operation state of the water pump and / or the compressor is adjusted and controlled as required, so that the low heat exchange efficiency, the low utilization rate of the compressor exhaust heat and the large power consumption of the water pump caused by the constant pumping flow of the water pump in the prior art can be effectively overcome.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a control method, control device, storage medium, and heat pump system for a heat pump system. Background Technology

[0002] Ground source heat pumps have experienced rapid development due to their advantages such as energy saving, environmental protection, and safe and stable operation. Besides basic cooling and heating functions, which can lower or raise the ambient temperature, ground source heat pump systems can also use the compressor exhaust temperature to heat domestic hot water, providing users with domestic hot water. However, when heating domestic hot water, since user demand is constantly changing, if the domestic water supply pump always supplies water at the same flow rate, it will not only waste electricity but may also result in failure to meet user hot water demand in a timely manner, and the heat utilization rate of the compressor exhaust temperature will be low.

[0003] Based on the aforementioned shortcomings, patent CN102840714 discloses a heat pump system with hot water function and its control method. It improves the water-side subsystem by switching the hot water flow direction to achieve multiple operating modes. The domestic hot water tank can utilize the exhaust heat of the compressor for heating. However, the operation and control are relatively complex. The hot water pump cannot be controlled by variable flow, resulting in low overall heat exchange efficiency and low utilization rate of exhaust heat. At the same time, the process of adjusting the heat exchange of the domestic hot water tank causes large fluctuations in the indoor temperature, which reduces the user experience. Summary of the Invention

[0004] Therefore, the present invention provides a control method, control device, storage medium and heat pump system for a heat pump system, which can solve the technical problems in the prior art of heat pump systems with hot water tanks, such as the inability to adjust the water pump flow rate, low overall system heat exchange efficiency and low utilization rate of compressor exhaust heat.

[0005] To address the aforementioned problems, this invention provides a control method for a heat pump system. The heat pump system includes a refrigerant circulation subsystem for cooling and heating, a domestic hot water system, and an intermediate heat exchanger. The refrigerant circulation subsystem for cooling and heating includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The domestic hot water system includes a water tank and a water pump. Water in the water tank, driven by the water pump, absorbs heat from the refrigerant in the compressor's exhaust pipe at the intermediate heat exchanger. The control method includes the following steps:

[0006] Obtain the real-time outlet water temperature T2 of the water tank and the real-time outlet water temperature T1 of the water supply pipe; compare the magnitudes of T2 with the user-set temperature Ts and T1 with the user-set temperature Ts, respectively.

[0007] When T2 < Ts, adjust the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system; or,

[0008] When T1 = Ts, the water pump is controlled to stop operating.

[0009] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0010] The heat pump system operates in a cooling mode. When the heat pump system operates in the cooling mode, the operating power of the compressor is kept constant, the water flow rate of the water pump is increased, and the heat exchange efficiency of the outdoor heat exchanger is reduced.

[0011] In some implementations, when T2 < Ts and the heat pump system is operating in cooling mode, the flow rate of the water outlet pipe of the water tank is also obtained.

[0012] When the flow rate of the outlet pipe is greater than 0, the temperature difference ΔT between the outlet pipe and the water supply pipe of the water tank is further detected.

[0013] When ΔT is greater than the first preset value Tt1, the pump flow rate of the water pump is increased; or,

[0014] When ΔT is not greater than the first preset value Tt1, the pump flow rate of the water pump is reduced.

[0015] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0016] The heat pump system operates in a heating mode. When the heat pump system operates in the heating mode, the operating power of the compressor is increased and the water flow rate of the water pump is increased.

[0017] In some implementations, when T2 < Ts and the heat pump system is in heating mode, the flow rate of the water outlet pipe of the water tank is also obtained.

[0018] When the flow rate of the outlet pipe is greater than 0, the temperature difference ΔT between the outlet pipe and the water supply pipe of the water tank is further detected.

[0019] When ΔT is greater than the first preset value Tt1, the pump flow rate of the water pump is increased; or,

[0020] When ΔT is not greater than the first preset value Tt1, the pump flow rate of the water pump is reduced.

[0021] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0022] The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor to run, the four-way valve in the cooling and heating refrigerant circulation subsystem is switched to a position that matches the heating mode, and the fan corresponding to the indoor heat exchanger is controlled to stop running.

[0023] The present invention also provides a control device for a heat pump system, the heat pump system comprising a refrigerant circulation subsystem for cooling and heating, a domestic hot water system, and an intermediate heat exchanger, wherein the refrigerant circulation subsystem for cooling and heating includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger, the domestic hot water system includes a water tank and a water pump, wherein water in the water tank, driven by the water pump, absorbs heat from the refrigerant in the exhaust pipe of the compressor at the intermediate heat exchanger, and the control device includes:

[0024] The acquisition unit is used to acquire the real-time water outlet temperature T2 of the water tank and the real-time water outlet temperature T1 of the water supply pipe.

[0025] The comparison unit is used to compare the magnitudes of T2 with the user-set temperature Ts and T1 with the user-set temperature Ts, respectively.

[0026] An execution unit is configured to adjust the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system when T2 < Ts; or,

[0027] When T1 = Ts, the water pump is controlled to stop operating.

[0028] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0029] The heat pump system operates in a cooling mode. When the heat pump system operates in the cooling mode, the operating power of the compressor is kept constant, the water flow rate of the water pump is increased, and the heat exchange efficiency of the outdoor heat exchanger is reduced.

[0030] In some implementations, when T2 < Ts and the heat pump system is operating in cooling mode, the flow rate of the water outlet pipe of the water tank is also obtained.

[0031] When the flow rate of the outlet pipe is greater than 0, the temperature difference ΔT between the outlet pipe and the water supply pipe of the water tank is further detected.

[0032] When ΔT is greater than the first preset value Tt1, the pump flow rate of the water pump is increased; or,

[0033] When ΔT is not greater than the first preset value Tt1, the pump flow rate of the water pump is reduced.

[0034] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0035] The heat pump system operates in a heating mode. When the heat pump system operates in the heating mode, the operating power of the compressor is increased and the water flow rate of the water pump is increased.

[0036] In some implementations, when T2 < Ts and the heat pump system is in heating mode, the flow rate of the water outlet pipe of the water tank is also obtained.

[0037] When the flow rate of the outlet pipe is greater than 0, the temperature difference ΔT between the outlet pipe and the water supply pipe of the water tank is further detected.

[0038] When ΔT is greater than the first preset value Tt1, the pump flow rate of the water pump is increased; or,

[0039] When ΔT is not greater than the first preset value Tt1, the pump flow rate of the water pump is reduced.

[0040] In some implementations, when T2 < Ts, adjusting the operating power of the compressor and / or the pumping flow rate of the water pump according to the operating mode of the heat pump system includes:

[0041] The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor to run, the four-way valve in the cooling and heating refrigerant circulation subsystem is switched to a position that matches the heating mode, and the fan corresponding to the indoor heat exchanger is controlled to stop running.

[0042] The present invention also provides a storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the steps of the control method for the heat pump system described above.

[0043] The present invention also provides a heat pump system, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of the control method of the heat pump system described above; or, it includes a control device for the heat pump system as described above.

[0044] The present invention provides a control method, control device, storage medium, and heat pump system for a heat pump system, which have the following beneficial effects:

[0045] By measuring the relationship between the real-time water temperature T2 in the water tank and the user-set temperature Ts, the operating status of the water pump and / or compressor can be adjusted and controlled as necessary. This can effectively overcome the shortcomings of the existing technology, such as low heat exchange efficiency, low utilization rate of compressor exhaust heat, and high power consumption of the water pump caused by the water pump operating at a constant pumping flow rate.

[0046] While keeping the compressor's operating power constant, the distribution of total heat between the outdoor heat exchanger and the intermediate heat exchanger is changed, thereby efficiently heating the water in the tank to the preset temperature without adding extra energy, reducing the operating power consumption of the heat pump system. More importantly, the process of rapidly heating the water in the tank does not cause significant fluctuations in the heat absorption of the indoor heat exchanger, thus contributing to a constant indoor temperature. Attached Figure Description

[0047] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0048] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0049] Figure 1 This is a schematic diagram of the steps of the control method of the heat pump system according to an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the heat pump system in an embodiment of the present invention.

[0051] The reference numerals in the attached figures are as follows:

[0052] 11. Compressor;

[0053] 12. Outdoor heat exchanger;

[0054] 13. Indoor heat exchanger;

[0055] 14. Four-way valve;

[0056] 15. Throttling element;

[0057] 21. Water tank; 211. Outlet pipe; 212. Inlet pipe; 213. First solenoid valve; 214. Second solenoid valve; 215. First temperature detection component; 216. Second temperature detection component;

[0058] 22. Water pump;

[0059] 3. Intermediate heat exchanger. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0064] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0065] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0066] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0067] See Figure 2As shown, this invention discloses a heat pump system, which includes a refrigerant circulation subsystem for cooling and heating (not labeled in the figure), a domestic hot water system (not labeled in the figure), and an intermediate heat exchanger 3. Specifically, the refrigerant circulation subsystem for cooling and heating relies on the refrigerant to form a circulation, thereby achieving heating or cooling of a corresponding space (e.g., an indoor space such as a machine room). This subsystem specifically includes a compressor 11, an outdoor heat exchanger 12, an indoor heat exchanger 13, a four-way valve 14, and a throttling element 15. The four-way valve 14 switches different flow paths according to the heating or cooling mode of the heat pump system to achieve the switching between the two modes. The refrigerant in the exhaust pipe of the compressor 11 flows through the intermediate heat exchanger 3. The heat exchangers 3 are connected in series, meaning that the high-temperature refrigerant in the exhaust pipe of the compressor 11 first flows into the intermediate heat exchanger 3 and then flows to the subsequent components. The domestic hot water system includes a water tank 21, a water pump 22, an outlet pipe 211 connected to the upper area of ​​the water tank 21, and a water supply pipe 212 connected to the lower area of ​​the water tank 21. The water pump 22 pumps the water in the lower area of ​​the water tank 21 into the intermediate heat exchanger 3 through the pump inlet pipe. After exchanging heat with the high-temperature refrigerant in the exhaust pipe of the compressor 11 in the intermediate heat exchanger 3, the water flows back from the pump outlet pipe to the upper area of ​​the water tank 21. That is, the water in the water tank 21 absorbs the heat of the refrigerant in the exhaust pipe of the compressor 11 at the intermediate heat exchanger 3 under the drive of the water pump 22.

[0068] It should be noted that in the aforementioned heat pump system, the water pump 22 pumps water from the lower region of the water tank 21 to the intermediate heat exchanger 3 for heat exchange, and then pumps the water to the upper region of the water tank 21. At the same time, the water outlet pipe 211 is located in the aforementioned upper region and the water supply pipe 212 is located in the aforementioned lower region. This makes it more efficient to heat the water to the set temperature.

[0069] A first solenoid valve 213 is connected in series on the outlet pipe 211, and a second solenoid valve 214 is connected in series on the water supply pipe 212. A first temperature detection component 215 is installed in the upper region of the water tank 21 to detect the real-time water temperature at the outlet pipe 211, and a second temperature detection component 216 is installed in the lower region of the water tank 21 to detect the real-time water temperature at the inlet position of the water supply pipe 212, i.e., the lower region of the water tank 21. This allows for real-time detection of both the upper and lower positions of the water tank 21, ensuring spatial temperature uniformity within the water tank 21. The aforementioned first temperature detection component 215 and second temperature detection component 216 can be existing temperature sensors, and this invention does not provide special protection for them.

[0070] See further Figure 2As shown, when the heat pump system is operating in cooling mode, the compressor 11 operates, and the high-temperature refrigerant discharged from it first enters the intermediate heat exchanger 3 to exchange heat with the water in the water tank 21 before reaching the four-way valve 14. Under the flow path switching action of the four-way valve 14, the refrigerant enters the outdoor heat exchanger 12 for further heat exchange and cooling, and then enters the indoor heat exchanger 13 to exchange heat with the air in the indoor space (fan operation), achieving the purpose of cooling, and then flows back to the compressor 11. When the heat pump system is operating in heating mode, the compressor 11 operates, and the high-temperature refrigerant discharged from it first enters the intermediate heat exchanger 3 to exchange heat with the water in the water tank 21 before reaching the four-way valve 14. Under the flow path switching action of the four-way valve 14, the refrigerant enters the indoor heat exchanger 13 for further heat exchange and cooling, and simultaneously enters the indoor heat exchanger 12 to exchange heat with the air in the indoor space (fan operation), achieving the purpose of cooling, and then flows back to the compressor 11. The fan corresponding to the indoor heat exchanger 13 operates to heat the indoor space, and then flows into the outdoor heat exchanger 12 before flowing back to the compressor 11. The heat pump system can also have a pure hot water mode. In this mode, the user does not select the indoor heating or cooling mode. When the user selects the pure hot water mode, the heat pump system is in the same direction as the heating mode in terms of refrigerant flow. However, the fan corresponding to the indoor heat exchanger 13 does not operate, so it does not have a heating effect on the indoor temperature. It should be noted that when the user selects the pure hot water mode, the heat pump system does not use the flow path of the cooling mode in terms of refrigerant flow to prevent the indoor heat exchanger 13 from becoming too cold and causing frost, which may lead to excessive condensation.

[0071] The aforementioned outdoor heat exchanger 12 can use a corresponding fan to drive airflow for heat exchange. When the heat pump system is a ground source heat pump system, a corresponding cold source can be used for heat exchange. No special limitation is made here.

[0072] The formula for calculating the compressor input power P differs depending on the working principle of the cooling mode and the heating mode. In the cooling mode: P*K=P1+P3=P2, this formula is denoted as formula (1); in the heating mode: P*K=P1=P2+P3, this formula is denoted as formula (2), where K is the heat transfer coefficient of the compressor, P1 is the heat transfer power of the outdoor heat exchanger 12, P2 is the heat transfer power of the indoor heat exchanger 13, P3 is the power of the intermediate heat exchanger 3, and K is the heat transfer coefficient.

[0073] See also Figure 1 and Figure 2 As shown in the embodiment of the present invention, a control method for a heat pump system is provided, comprising the following steps:

[0074] The real-time water outlet temperature T2 of the water tank 21 and the real-time water outlet temperature T1 of the water supply pipe 212 are obtained. The real-time water outlet temperature T2 can be obtained by the first temperature detection component 215 mentioned above, and the real-time water outlet temperature T1 can be obtained by the second temperature detection component 216 mentioned above.

[0075] Compare the magnitudes of T2 with the user-set temperature Ts, and T1 with the user-set temperature Ts.

[0076] When T2 < Ts, it indicates that the water temperature in the water tank 21 has not reached the user's set requirements. Therefore, it is necessary to adjust the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system to increase the heat exchange of the water in the water tank 21 at the intermediate heat exchanger 3. Alternatively, when T1 = Ts, the water temperature is constant, the water tank 21 is full, and the user's set requirements are met. The water pump 22 is then controlled to stop operating to reduce the power consumption caused by the operation of the water pump 22.

[0077] In this technical solution, by adjusting and controlling the operating status of the water pump 22 and / or compressor 11 as necessary by measuring the relationship between the real-time temperature T2 of the water in the water tank 21 and the user-set temperature Ts, the shortcomings of the prior art, such as low heat exchange efficiency, low utilization rate of compressor exhaust heat and high power consumption of the water pump 22, which are caused by the water pump 22 operating at a constant pumping flow rate, can be effectively overcome.

[0078] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0079] When the heat pump system operates in the cooling mode, according to the formula (1) above, the operating power of the compressor 11 is kept constant, which can keep the heat exchange power at the indoor heat exchanger 13 constant. This is beneficial to keep the indoor temperature constant, that is, the fluctuation is small. At the same time, the pumping flow rate of the water pump 22 is increased, which increases the heat exchange at the intermediate heat exchanger 3, so that the water temperature in the water tank 21 quickly reaches the set temperature T1, and the heat exchange efficiency of the outdoor heat exchanger 12 is reduced. Specifically, this can be achieved by reducing the speed of the fan matched with the outdoor heat exchanger 12 or the cooling capacity of the cold source.

[0080] In this technical solution, taking into account the energy conservation characteristics of the heat pump system in cooling mode, under the premise of keeping the operating power of the compressor 11 unchanged, the distribution of total heat between the outdoor heat exchanger 12 and the intermediate heat exchanger 3 is changed. Thus, the water in the water tank 21 can be efficiently heated to the preset temperature without the need for additional energy, reducing the operating power consumption of the heat pump system. More importantly, the process of rapidly heating the water in the water tank 21 will not cause large fluctuations in the heat absorption of the indoor heat exchanger 13, thus facilitating the maintenance of a constant indoor temperature.

[0081] Furthermore, when T2 < Ts and the heat pump system is in cooling mode, the method also includes obtaining the flow rate of the water outlet pipe 211 of the water tank 21.

[0082] When the flow rate of the outlet pipe 211 is greater than 0, it indicates that the user is using hot water. However, the water temperature may drop during the hot water usage process. At this time, the temperature difference ΔT between the outlet pipe 211 and the water supply pipe 212 of the water tank 21 is further detected. The temperature at the water supply pipe 212 is detected and obtained by the second temperature detection component 216.

[0083] When ΔT is greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is increased; or,

[0084] When ΔT is not greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is reduced.

[0085] In this technical solution, during the hot water extraction process, when the temperature difference ΔT between the outlet pipe 211 and the replenishment pipe 212 of the water tank 21 is large, it indicates that the water requires a large amount of heat to heat up. At this time, the water pump 22 is controlled to increase the pump flow rate, thereby increasing the heat exchange of the water with the high-temperature refrigerant in the intermediate heat exchanger 3 located in the exhaust pipe of the compressor 11. In some cases, the pumping flow rate of the water pump 22 can be controlled to the maximum value within the maximum heat exchange power range of the intermediate heat exchanger 3. Since there are many factors affecting the relationship between the water pump flow rate and the maximum heat exchange, they are not specifically described in this invention. The maximum water pump flow rate can be calculated based on the parameters of the water pump in different systems and the parameters of the water pump itself. When the temperature difference is small, the pumping flow rate of the water pump 22 can be reduced.

[0086] Understandably, according to the formula Q = qm * Cp * ΔT, where Q is the heat exchange capacity, qm is the water flow rate, and Cp is the specific heat capacity of water, typically taken as 4.2 × 10³ kJ / kg·℃, when the temperature difference between the inlet and outlet water increases while the required water flow rate remains constant, the heat exchanger's capacity increases, thus requiring an increase in the water supply. Conversely, the heat exchange capacity decreases. It should be noted that this technical solution ensures temperature uniformity between the upper and lower regions of the water tank 21 by assessing the relationship between ΔT and T1.

[0087] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0088] When the heat pump system operates in the heating mode, according to the formula (2) above, the operating power of the compressor 11 is increased and the pumping flow rate of the water pump 22 is increased, so as to increase the heat exchange power at the intermediate heat exchanger 3 by increasing the operating power of the compressor 11, and at the same time, the water in the water tank 21 is heated rapidly by increasing the pumping flow rate of the water pump 22.

[0089] Furthermore, similar to the cooling mode, in some embodiments, when T2 < Ts and the heat pump system is operating in heating mode, the flow rate of the water outlet pipe 211 of the water tank 21 is also obtained.

[0090] When the flow rate of the outlet pipe 211 is greater than 0, the temperature difference ΔT between the outlet pipe 211 and the water supply pipe 212 of the water tank 21 is further detected.

[0091] When ΔT is greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is increased; or,

[0092] When ΔT is not greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is reduced.

[0093] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0094] The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor 11 to run, the four-way valve 14 in the cooling and heating refrigerant circulation subsystem is switched to a position matching the heating mode, and the fan corresponding to the indoor heat exchanger 13 is controlled to stop running. At the same time, it is understood that a baffle is also provided on the air outlet path of the indoor heat exchanger 13. At this time, the baffle is controlled to be in the windproof position to reduce the adverse effects of the indoor heat exchanger 13 on the temperature of the indoor space in the pure hot water mode.

[0095] According to an embodiment of the present invention, a control device for a heat pump system is provided, comprising the following steps:

[0096] The acquisition unit is used to acquire the real-time water outlet temperature T2 of the water tank 21 and the real-time water outlet temperature T1 of the water supply pipe 212. The real-time water outlet temperature T2 can be specifically detected by the first temperature detection component 215 mentioned above, and the real-time water outlet temperature T1 can be specifically detected by the second temperature detection component 216 mentioned above.

[0097] The comparison unit is used to compare the magnitudes of T2 with the user-set temperature Ts and T1 with the user-set temperature Ts.

[0098] The execution unit is used to adjust the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system when T2 < Ts, indicating that the water temperature in the water tank 21 has not reached the user's set requirements, so the heat exchange heat of the water in the water tank 21 at the intermediate heat exchanger 3 is increased; or, when T1 = Ts, the water temperature is constant, the water tank 21 is full and the user's set requirements are met, and the water pump 22 is controlled to stop running to reduce the power consumption caused by the operation of the water pump 22.

[0099] In this technical solution, by adjusting and controlling the operating status of the water pump 22 and / or compressor 11 as necessary by measuring the relationship between the real-time temperature T2 of the water in the water tank 21 and the user-set temperature Ts, the shortcomings of the prior art, such as low heat exchange efficiency, low utilization rate of compressor exhaust heat and high power consumption of the water pump 22, which are caused by the water pump 22 operating at a constant pumping flow rate, can be effectively overcome.

[0100] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0101] When the heat pump system operates in the cooling mode, according to the formula (1) above, the operating power of the compressor 11 is kept constant, which can keep the heat exchange power at the indoor heat exchanger 13 constant. This is beneficial to keep the indoor temperature constant, that is, the fluctuation is small. At the same time, the pumping flow rate of the water pump 22 is increased, which increases the heat exchange at the intermediate heat exchanger 3, so that the water temperature in the water tank 21 quickly reaches the set temperature T1, and the heat exchange efficiency of the outdoor heat exchanger 12 is reduced. Specifically, this can be achieved by reducing the speed of the fan matched with the outdoor heat exchanger 12 or the cooling capacity of the cold source.

[0102] In this technical solution, taking into account the energy conservation characteristics of the heat pump system in cooling mode, under the premise of keeping the operating power of the compressor 11 unchanged, the distribution of total heat between the outdoor heat exchanger 12 and the intermediate heat exchanger 3 is changed. Thus, the water in the water tank 21 can be efficiently heated to the preset temperature without the need for additional energy, reducing the operating power consumption of the heat pump system. More importantly, the process of rapidly heating the water in the water tank 21 will not cause large fluctuations in the heat absorption of the indoor heat exchanger 13, thus facilitating the maintenance of a constant indoor temperature.

[0103] Furthermore, when T2 < Ts and the heat pump system is in cooling mode, the method also includes obtaining the flow rate of the water outlet pipe 211 of the water tank 21.

[0104] When the flow rate of the outlet pipe 211 is greater than 0, it indicates that the user is using hot water. However, the water temperature may drop during the hot water usage process. At this time, the temperature difference ΔT between the outlet pipe 211 and the water supply pipe 212 of the water tank 21 is further detected. The temperature at the water supply pipe 212 is detected and obtained by the second temperature detection component 216.

[0105] When ΔT is greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is increased; or,

[0106] When ΔT is not greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is reduced.

[0107] In this technical solution, during the hot water extraction process, when the temperature difference ΔT between the outlet pipe 211 and the replenishment pipe 212 of the water tank 21 is large, it indicates that the water requires a large amount of heat to heat up. At this time, the water pump 22 is controlled to increase the pump flow rate, thereby increasing the heat exchange of the water with the high-temperature refrigerant in the intermediate heat exchanger 3 located in the exhaust pipe of the compressor 11. In some cases, the pumping flow rate of the water pump 22 can be controlled to the maximum value within the maximum heat exchange power range of the intermediate heat exchanger 3. Since there are many factors affecting the relationship between the water pump flow rate and the maximum heat exchange, they are not specifically described in this invention. The maximum water pump flow rate can be calculated based on the parameters of the water pump in different systems and the parameters of the water pump itself. When the temperature difference is small, the pumping flow rate of the water pump 22 can be reduced.

[0108] Understandably, according to the formula Q = qm * Cp * ΔT, where Q is the heat exchange capacity, qm is the water flow rate, and Cp is the specific heat capacity of water, typically taken as 4.2 × 10³ kJ / kg·℃, when the temperature difference between the inlet and outlet water increases while the required water flow rate remains constant, the heat exchanger's capacity increases, thus requiring an increase in the water supply. Conversely, the heat exchange capacity decreases. It should be noted that this technical solution ensures temperature uniformity between the upper and lower regions of the water tank 21 by assessing the relationship between ΔT and T1.

[0109] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0110] When the heat pump system operates in the heating mode, according to the formula (2) above, the operating power of the compressor 11 is increased and the pumping flow rate of the water pump 22 is increased, so as to increase the heat exchange power at the intermediate heat exchanger 3 by increasing the operating power of the compressor 11, and at the same time, the water in the water tank 21 is heated rapidly by increasing the pumping flow rate of the water pump 22.

[0111] Furthermore, similar to the cooling mode, in some embodiments, when T2 < Ts and the heat pump system is operating in heating mode, the flow rate of the water outlet pipe 211 of the water tank 21 is also obtained.

[0112] When the flow rate of the outlet pipe 211 is greater than 0, the temperature difference ΔT between the outlet pipe 211 and the water supply pipe 212 of the water tank 21 is further detected.

[0113] When ΔT is greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is increased; or,

[0114] When ΔT is not greater than the first preset value Tt1, the pumping flow rate of the water pump 22 is reduced.

[0115] In some implementations, when T2 < Ts, adjusting the operating power of the compressor 11 and / or the pumping flow rate of the water pump 22 according to the operating mode of the heat pump system includes:

[0116] The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor 11 to run, the four-way valve 14 in the cooling and heating refrigerant circulation subsystem is switched to a position matching the heating mode, and the fan corresponding to the indoor heat exchanger 13 is controlled to stop running. At the same time, it is understood that a baffle is also provided on the air outlet path of the indoor heat exchanger 13. At this time, the baffle is controlled to be in the windproof position to reduce the adverse effects of the indoor heat exchanger 13 on the temperature of the indoor space in the pure hot water mode.

[0117] According to an embodiment of the present invention, a storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the control method of the heat pump system described above.

[0118] Because of the aforementioned control method, it also has the following effects:

[0119] By measuring the relationship between the real-time water temperature T2 in the water tank and the user-set temperature Ts, the operating status of the water pump and / or compressor can be adjusted and controlled as necessary. This can effectively overcome the shortcomings of the existing technology, such as low heat exchange efficiency, low utilization rate of compressor exhaust heat, and high power consumption of the water pump caused by the water pump operating at a constant pumping flow rate.

[0120] While keeping the compressor's operating power constant, the distribution of total heat between the outdoor heat exchanger and the intermediate heat exchanger is changed, thereby efficiently heating the water in the tank to the preset temperature without adding extra energy, reducing the operating power consumption of the heat pump system. More importantly, the process of rapidly heating the water in the tank does not cause significant fluctuations in the heat absorption of the indoor heat exchanger, thus contributing to a constant indoor temperature.

[0121] According to an embodiment of the present invention, a heat pump system is also provided, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of the control method of the heat pump system described above; or, it includes a control device for the heat pump system as described above.

[0122] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes a refrigerant circulation subsystem for cooling and heating, a domestic hot water system, and an intermediate heat exchanger (3). The refrigerant circulation subsystem for cooling and heating includes a compressor (11), an outdoor heat exchanger (12), and an indoor heat exchanger (13). The domestic hot water system includes a water tank (21), a water pump (22), an outlet pipe (211) connected to the upper area of ​​the water tank (21), and a water supply pipe (212) connected to the lower area of ​​the water tank (21). The water in the water tank (21) absorbs heat from the refrigerant in the exhaust pipe of the compressor (11) at the intermediate heat exchanger (3) under the drive of the water pump (22). The water pump (22) pumps water from the lower area of ​​the water tank (21) to the intermediate heat exchanger (3) for heat exchange and then pumps the water to the upper area of ​​the water tank (21). The control method includes the following steps: Obtain the real-time outlet water temperature T2 of the water tank (21) and the real-time outlet water temperature T1 of the water supply pipe (212); Compare the magnitudes of T2 with the user-set temperature Ts and T1 with the user-set temperature Ts, respectively. When T2 < Ts, adjust the operating power of the compressor (11) and / or the pumping flow rate of the water pump (22) according to the operating mode of the heat pump system, including: The heat pump system operates in two modes: a cooling mode and a heating mode. When the heat pump system operates in the cooling mode, the operating power of the compressor (11) is kept constant, the water flow rate of the water pump (22) is increased, and the heat exchange efficiency of the outdoor heat exchanger (12) is reduced. When the heat pump system operates in the heating mode, the operating power of the compressor (11) is increased, and the water flow rate of the water pump (22) is increased. When T1=Ts, control the water pump (22) to stop operating.

2. The control method according to claim 1, characterized in that, When T2 < Ts, adjust the operating power of the compressor (11) and / or the pumping flow rate of the water pump (22) according to the operating mode of the heat pump system, including: The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor (11) to run, the four-way valve (14) in the cooling and heating refrigerant circulation subsystem is switched to a position that matches the heating mode, and the fan corresponding to the indoor heat exchanger (13) is controlled to stop running.

3. A control device for a heat pump system, characterized in that, The heat pump system includes a refrigerant circulation subsystem for cooling and heating, a domestic hot water system, and an intermediate heat exchanger (3). The refrigerant circulation subsystem for cooling and heating includes a compressor (11), an outdoor heat exchanger (12), and an indoor heat exchanger (13). The domestic hot water system includes a water tank (21), a water pump (22), an outlet pipe (211) connected to the upper area of ​​the water tank (21), and a water supply pipe (212) connected to the lower area of ​​the water tank (21). The water in the water tank (21) absorbs heat from the refrigerant in the exhaust pipe of the compressor (11) at the intermediate heat exchanger (3) under the drive of the water pump (22). The water pump (22) pumps water from the lower area of ​​the water tank (21) to the intermediate heat exchanger (3) for heat exchange and then pumps the water to the upper area of ​​the water tank (21). The control device includes: The acquisition unit is used to acquire the real-time outlet water temperature T2 of the water tank (21) and the real-time outlet water temperature T1 of the water supply pipe (212); The comparison unit is used to compare the magnitudes of T2 with the user-set temperature Ts and T1 with the user-set temperature Ts, respectively. An execution unit, configured to adjust the operating power of the compressor (11) and / or the pumping flow rate of the water pump (22) according to the operating mode of the heat pump system when T2 < Ts, includes: The heat pump system operates in two modes: a cooling mode and a heating mode. When the heat pump system operates in the cooling mode, the operating power of the compressor (11) is kept constant, the water flow rate of the water pump (22) is increased, and the heat exchange efficiency of the outdoor heat exchanger (12) is reduced. When the heat pump system operates in the heating mode, the operating power of the compressor (11) is increased, and the water flow rate of the water pump (22) is increased. When T1=Ts, control the water pump (22) to stop operating.

4. The control device according to claim 3, characterized in that, When T2 < Ts, adjust the operating power of the compressor (11) and / or the pumping flow rate of the water pump (22) according to the operating mode of the heat pump system, including: The heat pump system operates in a pure hot water mode. When the heat pump system operates in the pure hot water mode, while controlling the compressor (11) to run, the four-way valve (14) in the cooling and heating refrigerant circulation subsystem is switched to a position that matches the heating mode, and the fan corresponding to the indoor heat exchanger (13) is controlled to stop running.

5. A storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method for the heat pump system according to any one of claims 1 to 2.

6. A heat pump system comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the control method for the heat pump system according to any one of claims 1 to 2; or, comprising a control device for the heat pump system according to any one of claims 3 to 4.

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