Heat pump system, heat pump system design method, control method and medium

Abstract

The present disclosure relates to a heat pump system, a heat pump system design method, a heat pump system control method and a computer readable storage medium, the heat pump system comprising: a supply device (1) configured to provide a medium to be heated; a storage device (2) configured to store the heated medium; the one or more heat pump modules (3) are connected with the supply device (1) and the storage device (2) respectively and are configured to heat a medium provided by the supply device (1), and the number of the heat pump modules (3) is the ratio of the heat power requirement of a user to the heat output power of each heat pump module (3); wherein each heat pump module (3) comprises a compressor (31), a condenser (32), a throttling element (33) and an evaporation assembly which are sequentially connected, and each evaporation assembly comprises an evaporator (34) and a photovoltaic photo-thermal assembly (35) which are connected in parallel.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat pumps, and in particular, to a heat pump system, a heat pump system design method, a heat pump system control method, and a computer-readable storage medium. Background Art

[0002] During the operation of a photovoltaic module, heat energy is generated. Utilizing the waste heat generated by the photovoltaic module to drive a heat pump for heating can efficiently utilize solar energy, help the photovoltaic module dissipate heat, and maintain its power generation efficiency.

[0003] In order to achieve the best heat pump performance in the related photovoltaic-thermal heat pump, it is necessary to carry out engineering application design for different heat pump systems. However, in the actual engineering application of the photovoltaic-thermal heat pump, the heat power demand of customers is not fixed. If a photovoltaic-thermal heat pump system product is designed separately for each customer, it will consume a large amount of time and energy of the company's R & D personnel. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide a heat pump system, a heat pump system design method, a heat pump system control method, and a computer-readable storage medium, which can flexibly meet the diverse needs of users and reduce the design cost.

[0005] In one aspect of the present disclosure, a heat pump system is provided, including:

[0006] A supply device configured to provide a medium to be heated;

[0007] A storage device configured to store the heated medium; and

[0008] One or more heat pump modules, each heat pump module being connected to the supply device and the storage device and configured to heat the medium provided by the supply device, the number of heat pump modules being the ratio of the user's heat power demand to the heat output power of each heat pump module;

[0009] Wherein, each heat pump module includes a compressor, a condenser, a throttling element, and an evaporation assembly connected in sequence, and the evaporation assembly includes an evaporator and a photovoltaic-thermal component connected in parallel.

[0010] In some embodiments, the number of photovoltaic-thermal components in each heat pump module is one or more;

[0011] Wherein, the number of photovoltaic-thermal components in each heat pump module is the ratio of the total heat exchange power required by the photovoltaic-thermal components to the heat exchange amount of each photovoltaic-thermal component, and the total heat exchange power required by the photovoltaic-thermal components is the difference between the heat output power of each heat pump module and the compressor power.

[0012] In some embodiments, the medium is a liquid; the heat pump system further includes:

[0013] A liquid level sensor is disposed in the storage device and configured to obtain the liquid level information in the storage device; and

[0014] A controller is signal-connected to the liquid level sensor and configured to determine the user's heat demand according to the liquid level information obtained by the liquid level sensor and the environmental irradiation intensity.

[0015] In some embodiments, the heat pump system further includes:

[0016] A first valve is disposed between the throttling element and the evaporator and configured to switch the on / off state of the pipeline between the throttling element and the evaporator; and

[0017] A second valve is disposed between the throttling element and the photovoltaic-thermal module and configured to switch the on / off state of the pipeline between the throttling element and the photovoltaic-thermal module;

[0018] Wherein, the controller is signal-connected to the first valve and the second valve and configured to, in response to the user's heat demand being greater than the preset demand, adjust the working states of the first valve and the second valve according to the environmental irradiation intensity so that the evaporator or the photovoltaic-thermal module participates in the refrigerant cycle.

[0019] In some embodiments, the condensers of each heat pump module are respectively connected in parallel with the storage device and the supply device;

[0020] Wherein, the heat pump system further has one or more third valves, and the third valves are disposed between the supply device and the condenser and configured to switch the on / off state of the supply pipeline;

[0021] The controller is signal-connected to one or more third valves and configured to adjust the working states of the third valves to adjust the number of the heat pump modules turned on.

[0022] In some embodiments, the heat pump system further includes:

[0023] A temperature sensor is disposed in the return water pipeline between the heat pump module and the storage device and configured to obtain the return water temperature of the liquid delivered to the storage device;

[0024] Wherein, the controller is signal-connected to the temperature sensor and configured to adjust the number of the heat pump modules turned on according to the relationship between the environmental irradiation intensity and / or the return water temperature obtained by the temperature sensor and the preset temperature.

[0025] On the other hand of the embodiments of the present disclosure, a heat pump system design method based on the heat pump system according to any one of the above is provided, including:

[0026] Determine the number of heat pump modules according to the user's heat power demand and the heat output power of each heat pump module.

[0027] In some embodiments, the number of photovoltaic-thermal components in each heat pump module is one or more;

[0028] Wherein, the heat pump system design method further includes:

[0029] Determine the initial design quantity of the photovoltaic-thermal components according to the ratio of the total heat exchange power required by the photovoltaic-thermal components to the heat exchange quantity of each photovoltaic-thermal component;

[0030] Wherein, the total heat exchange power required by the photovoltaic-thermal components is the difference between the heat output power of each heat pump module and the compressor power.

[0031] In some embodiments, the heat pump system design method further includes:

[0032] Establish a simulation model of the photovoltaic-thermal components; and

[0033] Input the initial design quantity of the photovoltaic-thermal components into the photovoltaic-thermal component simulation model, and make the photovoltaic-thermal component simulation model iterate cyclically to determine the optimized design quantity of the photovoltaic-thermal components and the corresponding optimized series-parallel form;

[0034] Wherein, when the photovoltaic-thermal components are of the optimized design quantity and in the optimized series-parallel form, the pressure drop and heat exchange quantity of the photovoltaic-thermal components reach the optimal values.

[0035] In another aspect of the embodiments of the present disclosure, there is provided a heat pump system control method based on any one of the above heat pump systems, including:

[0036] Determine the user's heat demand according to the liquid level information of the storage device and the environmental irradiation intensity;

[0037] In response to the user's heat demand being greater than the preset demand, determine the number of heat pump modules to be turned on according to the environmental irradiation intensity and / or the return water temperature of the liquid conveyed to the storage device.

[0038] In some embodiments, the heat pump system further includes a liquid level sensor, which is arranged on the storage device and configured to obtain the liquid level information in the storage device;

[0039] Wherein, the operation of determining the user's heat demand according to the liquid level information of the storage device and the environmental irradiation intensity specifically includes:

[0040] In response to the environmental irradiation intensity being greater than the first preset irradiation intensity and the liquid level being less than the first preset liquid level, it is determined that the user's heat demand is greater than the preset demand;

[0041] In response to the environmental irradiation intensity being less than or equal to the first preset irradiation intensity, if the liquid level is less than the second preset liquid level and the liquid level change rate is greater than zero, it is determined that the user's heat demand is greater than the preset demand.

[0042] In some embodiments, the number of heat pump modules is multiple; the operation of determining the number of heat pump modules to be turned on specifically includes:

[0043] In response to the environmental irradiation intensity being greater than the first preset irradiation intensity, turn on all heat pump modules;

[0044] In response to the environmental irradiation intensity being less than or equal to the first preset irradiation intensity, turn on one heat pump module.

[0045] In some embodiments, the heat pump system further includes a temperature sensor disposed on the return water pipeline between the heat pump module and the storage device, configured to obtain the return water temperature of the liquid delivered to the storage device;

[0046] Wherein, the operation of determining the number of heat pump modules to be turned on further includes:

[0047] In response to the environmental irradiation intensity being less than or equal to the first preset irradiation intensity, if a heat pump module has been turned on and the return water temperature is less than the preset temperature, turn on one more heat pump module.

[0048] In some embodiments, the heat pump system control method further includes:

[0049] In response to turning on more heat pump modules, adjust the frequency of the compressor so that the compressor frequencies of each heat pump module are the same.

[0050] In another aspect of the present disclosure, there is provided a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a controller, the above-mentioned heat pump system control method is implemented.

[0051] Therefore, according to the embodiments of the present disclosure, the heat pump system is divided into one or more heat pump modules, and by coordinating the number of heat pump modules, the diverse heat power requirements of consumers can be flexibly met, without the need to separately design a photovoltaic-thermal heat pump system product for each customer, which helps to reduce the design and R & D costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0053] Referring to the drawings, the present disclosure can be more clearly understood according to the following detailed description, wherein:

[0054] Figure 1 is a schematic structural diagram of some embodiments of the heat pump system according to the present disclosure;

[0055] Figure 2 is a connection relationship diagram of some embodiments of the heat pump system according to the present disclosure;

[0056] Figure 3is a flowchart according to some embodiments of the design method of the heat pump system of the present disclosure;

[0057] Figure 4 is a flowchart according to some embodiments of the control method of the heat pump system of the present disclosure.

[0058] In the figure:

[0059] 1. Supply device; 11. Pump; 2. Storage device; 3. Heat pump module; 31. Compressor; 32. Condenser; 33. Throttle element; 34. Evaporator; 35. Photovoltaic-thermal component; 4. Liquid level sensor; 5. Controller; 61. First valve; 62. Second valve; 63. Third valve; 7. Temperature sensor; 8. Water usage end.

[0060] It should be understood that the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. In addition, the same or similar reference numerals represent the same or similar components. Detailed implementation manners

[0061] Now, various exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0062] The "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. Words such as "including" or "comprising" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0063] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0064] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0065] Technologies, methods, and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0066] Photovoltaic power generation technology is considered to be one of the most promising new energy technologies. Timely removing the waste heat generated by light during the operation of the photovoltaic system can help the photovoltaic modules dissipate heat, maintain the good working temperature and power generation efficiency of the photovoltaic modules. Using the waste heat generated by the photovoltaic modules to drive a heat pump for heating can also efficiently utilize solar energy, increase the heat output without increasing the photovoltaic area, achieving a twofold purpose.

[0067] To achieve the best heat pump performance, heat pumps with different rated heat output of compressors need to reasonably match the optimal number of photovoltaic-thermal modules. And to ensure uniform flow and avoid the adverse effects caused by uneven refrigerant distribution resulting in uneven temperature distribution of the photovoltaic-thermal modules, the series-parallel relationship between the photovoltaic-thermal modules should also be optimized. Therefore, a heat pump system with a determined rated heating power requires a well-matched number of photovoltaic-thermal modules and its optimized series-parallel relationship to fully exert the system performance of the photovoltaic-thermal heat pump.

[0068] The related technology does not consider the engineering application problem of the photovoltaic-thermal heat pump. To achieve the best heat pump performance, the photovoltaic-thermal heat pump needs to carry out engineering application design for different heat pump systems respectively. However, in the actual engineering application of the photovoltaic-thermal heat pump, the heat power demand of customers is not fixed. If designing photovoltaic-thermal heat pump system products separately for each customer, it will consume a large amount of time and energy of the company's R & D personnel.

[0069] In view of this, in one aspect of the embodiments of the present disclosure, a heat pump system is provided, which can flexibly meet the diverse needs of users and reduce the design cost.

[0070] Figure 1 is a schematic structural diagram of some embodiments of the heat pump system according to the present disclosure. Refer to Figure 1 , the heat pump system includes a supply device 1, a storage device 2, and one or more heat pump modules 3. Figure 1 Two heat pump modules 3 are shown in. When the number of heat pump modules 3 is greater than two, they are arranged in the same manner as shown in the figure.

[0071] The supply device 1 is configured to provide a medium to be heated. For example, the supply device 1 is a cold water tank that supplies cold water to the heat pump module 3 so that the heat pump module 3 heats the water.

[0072] The storage device 2 is configured to store the heated medium. For example, the storage device 2 is a water storage tank, and the water heated by the heat pump module 3 is collected through a pipeline and stored at the storage device 2.

[0073] The medium includes but is not limited to liquids, gases, etc., such as water or air. When the medium is a liquid, the storage device 2 is connected to the user's water use end 8 to provide hot water to the user. Each heat pump module 3 is provided with a cold water interface and a hot water interface, which are respectively connected to the supply device 1 and the storage device 2. The supply device 1 has a variable frequency pump 11 for pumping the water in the supply device 1 to the heat pump module 3.

[0074] The cold water referred to in this embodiment includes but is not limited to a liquid at the local ambient temperature. The cold water has not been heated by the heat pump module 3, and the hot water is a liquid heated by the heat pump module 3, and the temperature of the hot water is higher than that of the cold water.

[0075] The number of heat pump modules 3 is one or more. Each heat pump module 3 is connected in parallel with the supply device 1 and the storage device 2. The heat pump module 3 is configured to heat the medium provided by the supply device 1 to meet the user's heat demand.

[0076] The number of heat pump modules 3 is the ratio of the user's heat power demand to the heat output power of each heat pump module 3. The user's heat power demand is determined according to the actual situation, and the number of heat pump modules 3 is matched according to the user's heat power demand.

[0077] For example, if the customer needs a power of 36 kW and the heat output power of the heat pump module is 12 kW, then the number of heat pump modules 3 to be configured is 3. When the ratio of the user's heat power demand to the heat output power of each heat pump module 3 is not an integer, calculate the product of the integer part of the ratio and the heat output power of the heat pump module 3. If the difference between the user's heat power demand and the product exceeds half of the heat output power of the heat pump module 3, round up to improve the user's experience, otherwise round down.

[0078] Each heat pump module 3 includes a compressor 31, a condenser 32, a throttling element 33, and an evaporation assembly. The evaporation assembly includes an evaporator 34 and a photovoltaic thermal component 35 connected in parallel. The compressor 31, the condenser 32, and the throttling element 33 include but are not limited to forming a refrigerant circulation loop with either the evaporator 34 or the photovoltaic thermal component 35. The throttling element 33 includes but is not limited to an electronic expansion valve.

[0079] When the environmental irradiation intensity is relatively large, the compressor 31, the condenser 32, the throttling element 33 and the photovoltaic-thermal module 35 form a refrigerant circulation loop in sequence, and the waste heat of the photovoltaic-thermal module 35 is utilized to raise the temperature of the medium.

[0080] When the environmental irradiation intensity is relatively small, the compressor 31, the condenser 32, the throttling element 33 and the evaporator 34 form a refrigerant circulation loop in sequence, and the waste heat of the evaporator 34 is utilized to raise the temperature of the medium. According to the collected real-time environmental irradiation intensity, a decision is made on whether to use the traditional evaporator 34 or the photovoltaic-thermal module 35, so as to maximize the utilization efficiency of the photovoltaic-thermal module 35 and enable the heat pump system to achieve better operating efficiency.

[0081] In this embodiment, the heat pump system is divided into one or more heat pump modules 3. By coordinating the number of heat pump modules 3, the diverse heat power requirements of consumers can be flexibly met without the need to separately design photovoltaic-thermal heat pump system products for each customer, which helps to reduce the design and R & D costs.

[0082] Reference Figure 1 , in some embodiments, the number of photovoltaic-thermal modules 35 in each heat pump module 3 is one or more. The number of photovoltaic-thermal modules 35 in each heat pump module 3 is the ratio of the total required heat exchange power of the photovoltaic-thermal modules 35 to the heat exchange amount of each photovoltaic-thermal module 35. The total required heat exchange power of the photovoltaic-thermal modules 35 is the difference between the heat output power of each heat pump module 3 and the power of the compressor 31.

[0083] The heat output power of the heat pump module 3 is determined based on, but not limited to, the actual situation such as the number of photovoltaic-thermal modules that can be accommodated on the user's roof and parameters such as the pressure drop and heat exchange amount of the heat pump module 3, so that the heat pump module 3 can be applicable to most usage scenarios.

[0084] The total required heat exchange power of the photovoltaic-thermal modules 35 is determined according to the difference between the heat output power of the heat pump module 3 and the power of the compressor 31, and then the number of photovoltaic-thermal modules 35 in each heat pump module is determined according to the total required heat exchange power of the photovoltaic-thermal modules 35 and the rated heat exchange amount of the photovoltaic-thermal modules 35. The number and series-parallel form of the photovoltaic-thermal modules 35 can also be optimized and adjusted by means of simulation and experimental verification, so as to enable the heat pump module 3 to operate more efficiently.

[0085] In this embodiment, the number of photovoltaic-thermal modules 35 in each heat pump module 3 is fixed, and there is no need to readjust the design according to the different heat power requirements of customers, which can reduce the engineering design cost and improve the work efficiency.

[0086] Figure 2 is a connection diagram according to some embodiments of the heat pump system of the present disclosure. Reference Figure 1 and Figure 2, in some embodiments, the medium is a liquid, and the heat pump system further includes a liquid level sensor 4 and a controller 5.

[0087] The liquid level sensor 4 is disposed in the storage device 2 and is configured to obtain the liquid level information in the storage device 2. The liquid level sensor 4 includes, but is not limited to, being in the form of a floating ball disposed in the storage device 2.

[0088] The controller 5 is in signal connection with the liquid level sensor 4 and is configured to determine the user's heat demand according to the liquid level information obtained by the liquid level sensor 4 and the environmental irradiation intensity, so as to adjust the working state of the heat pump module 3 according to the magnitude of the heat demand and the water temperature condition.

[0089] The liquid level information includes, but is not limited to, the real-time liquid level height in the storage device 2, and further information such as the liquid level change rate obtained based on the real-time liquid level height. The calculation of the liquid level change rate can be implemented by the controller 5.

[0090] In this embodiment, by setting the liquid level sensor 4 to detect the water level of the heated liquid in the storage device 2 in real time, so as to determine the user's heat demand respectively under different environmental irradiation intensities, and then flexibly adjust the working state of the heat pump module 3, so that the heat pump system can meet the user's heat demand and operate more efficiently.

[0091] Reference Figure 1 and Figure 2 , in some embodiments, the heat pump system further includes a first valve 61 and a second valve 62. The first valve 61 is disposed between the throttling element 33 and the evaporator 34 and is configured to switch the on-off of the pipeline between the throttling element 33 and the evaporator 34. The second valve 62 is disposed between the throttling element 33 and the photovoltaic thermal component 35 and is configured to switch the on-off of the pipeline between the throttling element 33 and the photovoltaic thermal component 35. The first valve 61 and the second valve 62 include, but are not limited to, solenoid valves.

[0092] The controller 5 is in signal connection with the first valve 61 and the second valve 62 and is configured to respond to the user's heat demand being greater than the preset demand and adjust the working states of the first valve 61 and the second valve 62 according to the environmental irradiation intensity, so that the evaporator 34 or the photovoltaic thermal component 35 participates in the refrigerant cycle.

[0093] The high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 31 exchanges heat in the condenser 32 to heat the hot water to meet the customer's heat demand. After the gaseous refrigerant is condensed into a liquid high-pressure refrigerant in the condenser 32, it flows through the throttling element 33 and is throttled into a low-temperature and low-pressure gas-liquid mixed refrigerant.

[0094] When the user's heat demand is greater than the preset demand, more hot water needs to be generated by the heat pump module 3. According to the local environmental irradiation conditions, it is decided to open the first valve 61 or the second valve 62, so that the low-temperature and low-pressure gas-liquid mixed refrigerant flows into the evaporator 34 or the photovoltaic-thermal component 35 to evaporate and absorb heat, thereby creating higher system performance. The gaseous refrigerant after evaporation and heat absorption is sucked back into the compressor 31 to start the next cycle.

[0095] In this embodiment, when the user's heat demand is large, the traditional evaporator 34 or the photovoltaic-thermal component 35 is switched to participate in the refrigerant cycle to generate heat based on the real-time environmental irradiation intensity, coordinating the working state of the heat pump system under strong and weak sunlight, so that the heat pump system reaches a better operating efficiency and keeps the heat pump system in a high-performance state all the time.

[0096] Reference Figure 1 and Figure 2 In some embodiments, the condensers 32 of each heat pump module 3 are respectively connected in parallel with the storage device 2 and the supply device 1. The heat pump system also has one or more third valves 63, and the third valves 63 are arranged on the cold water supply pipeline between the supply device 1 and the condenser 32 and are configured to switch the on-off of the supply pipeline.

[0097] The third valve 63 includes but is not limited to an electromagnetic valve. The controller 5 is signal-connected to one or more third valves 63 and is configured to adjust the working state of the third valve 63 to adjust the number of heat pump modules 3 that are turned on.

[0098] In this embodiment, by setting the third valve 63 to switch the state of cold water supply to the heat pump module 3, the control of the number of heat pump modules 3 turned on in one or more heat pump modules 3 is realized, and the number of heat pump modules 3 turned on can be flexibly adjusted to meet the user's heat demand, so that the heat pump system always maintains a high working efficiency with the change of the environment.

[0099] Reference Figure 1 and Figure 2 In some embodiments, the heat pump system further includes a temperature sensor 7, and the temperature sensor 7 is arranged on the return water pipeline between the heat pump module 3 and the storage device 2 and is configured to obtain the return water temperature of the liquid transported to the storage device 2.

[0100] The controller 5 is signal-connected to the temperature sensor 7 and is configured to adjust the number of heat pump modules 3 that are turned on according to the relationship between the environmental irradiation intensity and / or the return water temperature obtained by the temperature sensor 7 and the preset temperature.

[0101] When the user's heat demand is greater than the preset demand, when the environmental irradiation intensity is greater than the first preset irradiation intensity, all heat pumps are turned on for heating. When the environmental irradiation intensity is greater than the first preset irradiation intensity, it is generally a daytime working condition. Turning on all heat pumps for heating is to store hot water during the day for use at night.

[0102] When the user's heat demand is greater than the preset demand, and when the ambient irradiation intensity is less than the first preset irradiation intensity, according to the relationship between the return water temperature obtained by the temperature sensor 7 and the preset temperature, it is determined whether the current heating capacity of the heat pump module meets the demand. When the return water temperature is less than the preset temperature, the number of heat pump modules 3 to be turned on needs to be increased to meet the user's heat demand. When the ambient irradiation intensity is less than the first preset irradiation intensity, it is generally a night condition. The value of the first preset irradiation intensity can be adjusted as needed, including but not limited to 0 W / m 2 。

[0103] In this embodiment, by setting the temperature sensor 7 to detect the return water temperature in real time, the number of operating heat pump modules can be adjusted in real time according to the user's heat demand and the heating capacity of the current heat pump system, enabling the heat pump system to operate with high performance and flexibly meet the customer's heat demand.

[0104] On the other hand, in an embodiment of the present disclosure, a heat pump system design method based on the heat pump system described above is provided, including: determining the number of heat pump modules 3 according to the user's heat power demand and the heat output power of each heat pump module 3.

[0105] The number of heat pump modules 3 is the ratio of the user's heat power demand to the heat output power of each heat pump module 3. The user's heat power demand is determined according to the actual situation, and the number of heat pump modules 3 is matched according to the user's heat power demand.

[0106] The heat output power of each heat pump module 3 is determined according to factors such as the market situation and the generally allowable laying area of photovoltaic-thermal components on the customer's roof, so that the heat pump module 3 becomes the smallest unit module that can be applied to most scenarios and has a larger scope of application.

[0107] In addition, parameters such as the number of heat pump modules 3, the number and series-parallel relationship of photovoltaic-thermal components 35 in the heat pump module 3 can also be determined with the goal of cost priority to flexibly meet the user's cost requirements.

[0108] In this embodiment, by modularly designing the heat pump system and constructing a photovoltaic-thermal heat pump system based on the coordinated cooperation of module units, it can fully meet the heat power demands of different customers, eliminating the need to separately design photovoltaic-thermal heat pump system products for each customer, which helps to reduce the design and R & D costs and accelerate the market promotion of photovoltaic-thermal heat pumps.

[0109] Figure 3 is a flowchart of some embodiments of the heat pump system design method according to the present disclosure. Refer to Figure 1 and Figure 3 , in some embodiments, the number of photovoltaic-thermal components 35 in each heat pump module 3 is one or more.

[0110] The heat pump system design method further includes step S1: In step S1, according to the ratio of the total heat exchange power required by the photovoltaic-thermal module 35 to the heat exchange amount of each photovoltaic-thermal module 35, the initial design quantity of the photovoltaic-thermal module 35 is determined. The total heat exchange power required by the photovoltaic-thermal module 35 is the difference between the heat output power of each heat pump module 3 and the power of the compressor 31.

[0111] The heat exchange amount of the photovoltaic-thermal module 35 is the heat exchange amount parameter under the standard test conditions provided by the photovoltaic-thermal module supplier, so as to match and design the initial design quantity of the photovoltaic-thermal module 35.

[0112] In this embodiment, determining the quantity of the photovoltaic-thermal module 35 in each heat pump module 3 does not require readjusting the design according to different heat power requirements of customers, which can reduce the engineering design cost and improve work efficiency.

[0113] Reference Figure 1 and Figure 3 In some embodiments, the heat pump system design method further includes step S2 and step S3: In step S2, a simulation model of the photovoltaic-thermal module is established; in step S3, the initial design quantity of the photovoltaic-thermal module 35 is input into the simulation model of the photovoltaic-thermal module, and the simulation model of the photovoltaic-thermal module is iterated to determine the optimized design quantity of the photovoltaic-thermal module 35 and the corresponding optimized series-parallel form.

[0114] When the photovoltaic-thermal module 35 has the optimized design quantity and is in the optimized series-parallel form, the performance such as the pressure drop and heat exchange amount of the photovoltaic-thermal module 35 reaches the optimal value, thereby forming an efficient photovoltaic-thermal heat pump module 3 with the best configuration.

[0115] By simulating and calculating under the most unfavorable operating conditions, it is checked whether the heat exchange amount of the photovoltaic-thermal module under the optimized configuration of the series-parallel system meets the requirements, and further it is determined whether the quantity ratio of the photovoltaic-thermal modules meets the requirements. The photovoltaic-thermal module quantity and its corresponding series-parallel optimized structure are finally determined by means of iterative cycling. After determining the final solution, it will be verified through experiments. The most unfavorable operating conditions include but are not limited to the condition with the lowest ambient temperature.

[0116] In this embodiment, the quantity, series-parallel form of the photovoltaic-thermal module 35, and the quantity on each branch can also be optimized and adjusted by means of simulation and experimental verification, so as to form a more efficient heat pump module 3.

[0117] Reference Figure 1 and Figure 3 In the following, the design flow of the heat pump system design method in some embodiments is given.

[0118] First, determine the heat output power W1 of the heat pump module 3. If the power of the compressor 31 is W2, then the total heat exchange power W3 required for the photovoltaic-thermal component 35 = W1 - W2. According to the heat exchange amount W4 of the photovoltaic-thermal component 35 under the optimized design conditions, the total number of components Z required for each heat pump module 3 can be obtained as Z = W3 / W4.

[0119] Then, through simulation and experimental verification, clarify the total number of components required for the optimized heat pump module 3 and the series-parallel form, and obtain the optimized design quantity of the photovoltaic-thermal component 35 and the corresponding optimized series-parallel form.

[0120] According to the total heat demand power W5 of the customer, the number N of heat pump modules 3 required can be obtained as N = W5 / W1. In this way, different heat power demands of the customer can be met without re-designing the internal structure of the heat pump module 3, greatly improving the working efficiency and significantly reducing the engineering design cost.

[0121] Figure 4 is a flowchart according to some embodiments of the heat pump system control method of the present disclosure. Refer to Figure 1 and Figure 4 , on the other hand, in an embodiment of the present disclosure, a heat pump system control method for a heat pump system based on any one of the above is provided, and the medium is a liquid. The heat pump system control method includes: step S4 and step S5.

[0122] In step S4, determine the heat demand of the user according to the liquid level information of the storage device 2 and the environmental irradiation intensity. In step S5, in response to the user's heat demand being greater than the preset demand, determine the number of heat pump modules 3 to be turned on according to the environmental irradiation intensity and / or the return water temperature of the liquid delivered to the storage device 2.

[0123] When the user's heat demand is greater than the preset demand, more heat needs to be generated by the heat pump module 3. If the environmental irradiation intensity is greater than the first preset irradiation intensity, generally in the daytime condition, turn on all the heat pump modules 3 for heating to store hot water during the day for use at night.

[0124] Further, the operating state of the heat pump system under strong and weak sunlight can be fully coordinated to ensure that the heat pump system is always in a high-performance state. For example, when the real-time environmental irradiation intensity is less than the second preset irradiation intensity, use the evaporator 34 to participate in the refrigerant cycle. When the real-time environmental irradiation intensity is greater than or equal to the second preset irradiation intensity, use the photovoltaic-thermal component 35 to participate in the refrigerant cycle to maximize the utilization of the thermal energy of the photovoltaic-thermal component 35.

[0125] The second preset irradiation intensity is greater than the first preset irradiation intensity, and the values of the first preset irradiation intensity and the second preset irradiation intensity can be adjusted according to the actual operating conditions. The value of the first preset irradiation intensity includes, but is not limited to, 0W / m2 The value of the second preset irradiation intensity includes, but is not limited to, 300 W / m 2 .

[0126] When the user's heat demand is greater than the preset demand, if the ambient irradiation intensity is less than the first preset irradiation intensity, which is generally in the night condition, according to the relationship between the return water temperature and the preset temperature, it is determined whether the current heating capacity of the heat pump module meets the demand. When the return water temperature is less than the preset temperature, the number of heat pump modules 3 to be turned on needs to be increased to meet the user's heat demand.

[0127] In this embodiment, it is determined whether the heat pump module 3 needs to produce more heat according to the liquid level information of the storage device 2 and the ambient irradiation intensity, and the number of heat pump modules 3 to be turned on is determined according to the ambient irradiation intensity and / or the return water temperature of the liquid delivered to the storage device 2, so as to flexibly adjust the working state of the heat pump system based on the user's heat demand and the ambient irradiation situation, and keep the heat pump system always in a high-performance working state.

[0128] Refer to Figure 1 , in some embodiments, the heat pump system further includes a liquid level sensor 4. The liquid level sensor 4 is disposed in the storage device 2 and is configured to obtain the liquid level information in the storage device 2.

[0129] The operation of determining the user's heat demand according to the liquid level information of the storage device 2 and the ambient irradiation intensity specifically includes: in response to the ambient irradiation intensity being greater than the first preset irradiation intensity and the liquid level being less than the first preset liquid level, it is determined that the user's heat demand is greater than the preset demand; in response to the ambient irradiation intensity being less than or equal to the first preset irradiation intensity, if the liquid level is less than the second preset liquid level and the liquid level change rate is greater than zero, it is determined that the user's heat demand is greater than the preset demand.

[0130] When the real-time ambient irradiation intensity is greater than the first preset irradiation intensity, it indicates that the heat pump system is in the day condition. At this time, the liquid level height in the storage device 2 is obtained. If the liquid level is greater than or equal to the first preset liquid level, the stored hot water is relatively sufficient, and there is no need to turn on the heat pump module 3 for operation.

[0131] If the liquid level is less than the first preset liquid level, it is determined that the user's heat demand is greater than the preset demand, and it is necessary to turn on the heat pump module 3 to heat more water. Subsequently, it can be selected whether the evaporator 34 or the photovoltaic-thermal component 35 participates in the refrigerant cycle according to the strength of the ambient irradiation intensity.

[0132] When the real-time ambient irradiation intensity is less than or equal to the first preset irradiation intensity, it indicates that the heat pump system is in the night condition. At this time, the liquid level height in the storage device 2 is obtained. If the liquid level is greater than or equal to the second preset liquid level, the hot water stored in the storage device 2 by the efficient operation of the heat pump module 3 during the day is supplied to the user.

[0133] As the customer continuously uses the system, when the liquid level gradually drops to the second preset liquid level, the liquid level change rate of the storage device 2 is detected and calculated. When the liquid level change rate is greater than zero, it indicates that the customer still has a heat demand, and the heat pump module 3 needs to be turned on to supplement hot water for the system to maintain the liquid level change rate.

[0134] The first preset liquid level is the energy storage set liquid level during the day, which is used to judge the energy storage situation under the day working condition and determine the heat demand under the day working condition. The second preset liquid level is the lowest water use level of the storage device 2, which is used to judge the energy storage situation under the night working condition and determine the heat demand under the night working condition.

[0135] In this embodiment, by detecting the hot water level in the storage device 2 in real time, the magnitude of the user's heat demand determined under different environmental irradiation intensities can be obtained, and then the working state of the heat pump module 3 can be flexibly adjusted, so that the heat pump system can meet the customer's heat demand and operate efficiently.

[0136] Reference Figure 1 , in some embodiments, the operation of determining the number of heat pump modules 3 to be turned on specifically includes: in response to the environmental irradiation intensity being greater than the first preset irradiation intensity, turning on all the heat pump modules 3; in response to the environmental irradiation intensity being less than or equal to the first preset irradiation intensity, turning on one heat pump module 3.

[0137] When the heat pump system is in the day working condition and the heat demand is greater than the preset demand, all the heat pump modules 3 are turned on for heating, so as to store hot water during the day for use at night. When the heat pump system is in the night working condition and the heat demand is greater than the preset demand, first turn on one heat pump module 3 to make the heat pump module 3 supplement hot water for the system to maintain the liquid level.

[0138] In this embodiment, when the heat demand is large during the day, all the heat pump modules 3 are turned on for heating and storing hot water. When the heat demand is large at night, first turn on one heat pump module 3 to maintain the liquid level, which can make the heat pump system operate efficiently and reduce the system energy consumption while meeting the customer's heat demand.

[0139] Reference Figure 1 , in some embodiments, the heat pump system further includes a temperature sensor 7. The temperature sensor 7 is arranged on the return water pipeline between the heat pump module 3 and the storage device 2 and is configured to obtain the return water temperature of the liquid delivered to the storage device 2.

[0140] The operation of determining the number of heat pump modules 3 to be turned on further includes: in response to the environmental irradiation intensity being less than or equal to the first preset irradiation intensity, if the heat pump module 3 has been turned on and the return water temperature is less than the preset temperature, an additional heat pump module 3 is turned on.

[0141] When the heat pump system is in the night condition, after turning on one heat pump module 3, it is determined whether the number of currently turned-on heat pump modules 3 meets the customer's heat power demand by detecting whether the return water temperature reaches the preset temperature.

[0142] If the return water temperature does not reach the preset temperature, the heating capacity of the current heat pump module 3 is insufficient, and one more heat pump module 3 needs to be turned on. If the return water temperature still does not reach the preset temperature after turning on one more heat pump module 3, new heat pump modules 3 are sequentially turned on until the return water temperature reaches the preset temperature.

[0143] In this embodiment, the heating capacity of the heat pump system is grasped according to the real-time detected return water temperature under the night condition, and the number of turned-on heat pump modules 3 is adjusted to make the heat pump system meet the customer's heat demand and operate in a high-performance state.

[0144] In some embodiments, the heat pump system control method further includes: in response to turning on a heat pump module 3, adjusting the frequency of the compressor 31 so that the frequencies of the compressors 31 of each heat pump module 3 are the same.

[0145] When turning on the heat pump module 3, the compressor of the heat pump module 3 operates in the optimal operating frequency band to improve the operating efficiency. After each new heat pump module 3 is turned on, the newly turned-on compressor 31 gradually increases its frequency, and the previously operating compressors 31 gradually decrease their frequencies. The frequencies of the compressors 31 of all heat pump modules 3 are readjusted to evenly output the heat power, so that the compressors 31 of each heat pump module 3 operate stably and efficiently at the same frequency within the frequency range.

[0146] In this embodiment, by adjusting the frequencies of the compressors 31 of the heat pump modules 3 to be the same, it helps to ensure that the operating conditions and lifetimes of the compressors 31 are the same, optimize the operating efficiency, and make the heat pump modules 3 operate more efficiently.

[0147] Reference Figure 1 and Figure 4 , the control flow of the heat pump system control method in some embodiments is given below.

[0148] When the real-time ambient irradiance intensity is greater than zero, it indicates that the heat pump system is in the day condition. At this time, it is obtained whether the liquid level height in the storage device 2 is equal to the first preset liquid level. If it is equal, the heat pump module 3 does not need to be turned on and operated.

[0149] If the liquid level height of the storage device 2 is less than the first preset liquid level, the heat pump system will decide whether to use the traditional evaporator 34 or the photovoltaic-thermal component 35 to participate in the refrigerant cycle according to the collected real-time ambient irradiance intensity, so as to make the system achieve better operating efficiency.

[0150] When the real-time ambient irradiance intensity is less than 300 W / m 2When it is time, open the first valve 61, close the second valve 62, use the evaporator 34 to participate in the refrigerant cycle, and open all the third valves 63 to start all the heat pump modules 3 to operate for heating.

[0151] When the real-time ambient irradiation intensity is greater than 300 W / m 2 When it is time, close the first valve 61, open the second valve 62, use the photovoltaic-thermal component 35 to participate in the refrigerant cycle, and open all the third valves 63 to start all the heat pump modules 3 to operate for heating.

[0152] Under the daytime working condition, select the evaporator 34 to participate in the work when the ambient irradiation intensity is low, and select the photovoltaic-thermal component 35 to participate in the work when the ambient irradiation intensity is high. Coordinate the operation state of the heat pump system when the sunlight is strong and weak, and ensure that the heat pump system is always in a high-performance state.

[0153] When the real-time ambient irradiation intensity is less than the first preset irradiation intensity, it indicates that the heat pump system is in the night working condition. At this time, if the heat pump operates, it will always use the evaporator 34, that is, always open the first valve 61 and close the second valve 62.

[0154] First, detect the liquid level height of the storage device 2. When the liquid level height of the storage device 2 is greater than the second preset liquid level, use the hot water stored in the storage device 2 during the efficient operation of the daytime heat pump system.

[0155] As the customer continuously uses it, the water level in the storage device 2 gradually drops below the second preset liquid level, and then detect and calculate the liquid level change rate of the storage device 2. When the liquid level change rate is greater than zero, it indicates that the customer still has a hot water demand. At this time, turn on the variable-frequency pump 11 and a heat pump module 3 to replenish water for the system to maintain the liquid level change rate at zero.

[0156] Judge the number of heat pump modules 3 that need to be turned on by detecting whether the return water temperature reaches the preset temperature. If the return water temperature does not reach the preset temperature, then the current number of turned-on heat pump modules 3 is not enough, and one more heat pump module 3 needs to be turned on.

[0157] When the user's hot water demand heat only requires one heat pump module 3, the compressor operating frequency is in the optimal operating frequency range. When the heat supplied by one heat pump module 3 is not enough to meet the user's demand heat, turn on the second heat pump module 3, the third heat pump module 3, and so on until the Nth heat pump module 3 provides heat in sequence.

[0158] Each time after a new heat pump module 3 is turned on, the compressors 31 of all heat pump modules 3 will readjust the frequency and average output thermal power. After all heat pump modules 3 are turned on, uniformly adjust the compressor frequencies of all modules and adjust the output thermal power to meet the customer's heat demand.

[0159] In yet another aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program, which when executed by a controller 5 implements any of the above-described heat pump system control methods. In one or more exemplary embodiments, the described functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or code. The computer-readable medium includes both computer storage media and communication media, including any medium that facilitates transfer of a computer program from one place to another. The storage medium may be any available medium accessible by a computer. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of the medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disk typically reproduces data magnetically, while disc reproduces data optically with a laser. Combinations of the above should also be included within the scope of computer-readable media. Thus far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0160] Thus far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0161] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A heat pump system, characterized in that: include: A supply device (1) configured to supply a medium to be heated; A storage device (2) configured to store the heated medium; and One or more heat pump modules (3), each of the heat pump modules (3) is connected to the supply device (1) and the storage device (2), and is configured to heat the medium provided by the supply device (1), and the number of the heat pump modules (3) is the ratio of the user's thermal power demand to the thermal output power of each of the heat pump modules (3); Each of the heat pump modules (3) comprises a compressor (31), a condenser (32), a throttling element (33) and an evaporation component connected in sequence, and the evaporation component comprises an evaporator (34) and a photovoltaic thermal component (35) connected in parallel.

2. The heat pump system according to claim 1, characterized in that: The number of the photovoltaic thermal components (35) in each heat pump module (3) is one or more; The number of the photovoltaic thermal components (35) in each of the heat pump modules (3) is the ratio of the total required heat exchange power of the photovoltaic thermal components (35) to the heat exchange capacity of each of the photovoltaic thermal components (35), and the total required heat exchange power of the photovoltaic thermal components (35) is the difference between the heat output power of each of the heat pump modules (3) and the power of the compressor (31).

3. The heat pump system according to claim 1 or 2, characterized in that: The medium is liquid; the heat pump system also includes: a liquid level sensor (4), arranged on the storage device (2), and configured to obtain liquid level information of the storage device (2); and The controller (5) is connected to the liquid level sensor (4) by signal and is configured to determine the user's heating demand based on the liquid level information obtained by the liquid level sensor (4) and the ambient radiation intensity.

4. The heat pump system according to claim 3, characterized in that: Also includes: A first valve (61) is disposed between the throttling element (33) and the evaporator (34), and is configured to switch the pipeline between the throttling element (33) and the evaporator (34) on and off; and A second valve (62) is disposed between the throttling element (33) and the photovoltaic thermal assembly (35), and is configured to switch the pipeline between the throttling element (33) and the photovoltaic thermal assembly (35) on and off; The controller (5) is connected to the first valve (61) and the second valve (62) by signals, and is configured to adjust the working state of the first valve (61) and the second valve (62) according to the ambient radiation intensity in response to the user's heat demand being greater than the preset demand, so as to enable the evaporator (34) or the photovoltaic thermal component (35) to participate in the refrigerant circulation.

5. The heat pump system according to claim 3, characterized in that: The condenser (32) of each heat pump module (3) is connected in parallel with the storage device (2) and the supply device (1); The heat pump system further comprises one or more third valves (63), wherein the third valves (63) are arranged between the supply device (1) and the condenser (32) and are configured to switch the supply pipeline on and off; The controller (5) is connected to each of the third valves (63) by signal, and is configured to adjust the working state of the third valve (63) to adjust the number of opened heat pump modules (3).

6. The heat pump system according to claim 5, characterized in that: Also includes: A temperature sensor (7) is arranged in the return water pipeline between the heat pump module (3) and the storage device (2), and is configured to obtain the return water temperature of the liquid transported to the storage device (2); The controller (5) is connected to the temperature sensor (7) by signal and is configured to adjust the number of activated heat pump modules (3) according to the relationship between the ambient radiation intensity and / or the return water temperature obtained by the temperature sensor (7) and a preset temperature.

7. A method for designing a heat pump system based on the heat pump system according to any one of claims 1 to 6, characterized in that: include: The number of the heat pump modules (3) is determined according to the user's thermal power demand and the thermal output power of each heat pump module (3).

8. The heat pump system design method according to claim 7, characterized in that: The number of the photovoltaic thermal components (35) in each heat pump module (3) is one or more; Wherein, the heat pump system design method further includes: Determining the initial design quantity of the photovoltaic thermal components (35) according to the ratio of the total required heat exchange power of the photovoltaic thermal components (35) to the heat exchange capacity of each photovoltaic thermal component (35); The total required heat exchange power of the photovoltaic thermal assembly (35) is the difference between the heat output power of each heat pump module (3) and the power of the compressor (31).

9. The heat pump system design method according to claim 6, characterized in that: Also includes: Build a simulation model for photovoltaic and thermal components; and Inputting the initial design quantity of the photovoltaic thermal component (35) into the photovoltaic thermal component simulation model, so that the photovoltaic thermal component simulation model iterates cyclically to determine the optimized design quantity of the photovoltaic thermal component (35) and the corresponding optimized series-parallel form; Wherein, when the photovoltaic thermal components (35) are in an optimized design quantity and are in an optimized series-parallel form, the voltage drop and heat exchange capacity of the photovoltaic thermal components (35) reach optimal values.

10. A heat pump system control method based on the heat pump system according to any one of claims 1 to 6, characterized in that: The medium is liquid, and the heat pump system control method includes: Determining the user's heat demand based on the liquid level information of the storage device (2) and the environmental radiation intensity; In response to the user's heat demand being greater than a preset demand, the number of heat pump modules (3) to be turned on is determined according to the ambient radiation intensity and / or the return water temperature of the liquid transported to the storage device (2).

11. The heat pump system control method according to claim 10, characterized in that: The heat pump system further comprises a liquid level sensor (4), wherein the liquid level sensor (4) is arranged on the storage device (2) and is configured to obtain liquid level information of the storage device (2); The operation of determining the user's heat demand based on the liquid level information of the storage device (2) and the ambient radiation intensity specifically includes: In response to the ambient radiation intensity being greater than the first preset radiation intensity and the liquid level being less than the first preset liquid level, determining that the user's heat demand is greater than the preset demand; In response to the ambient radiation intensity being less than or equal to the first preset radiation intensity, if the liquid level is less than the second preset liquid level and the liquid level change rate is greater than zero, it is determined that the user's heat demand is greater than the preset demand.

12. The heat pump system control method according to claim 10 or 11, characterized in that: The number of the heat pump modules (3) is plural; and the operation of determining the number of turned-on heat pump modules (3) specifically comprises: In response to the ambient radiation intensity being greater than a first preset radiation intensity, turning on all heat pump modules (3); In response to the ambient radiation intensity being less than or equal to a first preset radiation intensity, a heat pump module (3) is turned on.

13. The heat pump system control method according to claim 12, characterized in that: The heat pump system further comprises a temperature sensor (7), which is arranged in a return water pipeline between the heat pump module (3) and the storage device (2), and is configured to obtain a return water temperature of the liquid transported to the storage device (2); The operation of determining the number of turned-on heat pump modules (3) further comprises: In response to the ambient radiation intensity being less than or equal to a first preset radiation intensity, if the heat pump module (3) is already turned on and the return water temperature is less than a preset temperature, an additional heat pump module (3) is turned on.

14. The heat pump system control method according to claim 13, characterized in that: Also includes: In response to the addition of a heat pump module (3), the frequency of the compressor (31) is adjusted so that the frequency of the compressor (31) of each heat pump module (3) is consistent.

15. A computer-readable storage medium having a computer program stored thereon, wherein: When the program is executed by the controller (5), the heat pump system control method according to any one of claims 10 to 14 is implemented.

Images